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Cost-Effective Operation of Microgrids: A MILP-Based Energy Management System for Active and Reactive Power Control

Abstract

Microgrids (MGs) have emerged as a potential solution for the integration of Distributed Energy Resources (DERs) into the distribution network. In this sense, to effectively manage MGs, it is essential to implement Energy Management Systems (EMSs). This entails not only performing the unit commitment but also considering the voltage and reactive power technical constraints and managing ancillary services. This paper contributes with a comprehensive EMS for the optimal management of active and reactive power of a generic grid-tied MG composed of Renewable Energy Sources (RESs), Battery Energy Storage Systems (BESSs), Diesel Generator (DGs) units and loads, with the goal of reducing the operating costs of the facility. The EMS includes models for the power electronics units to apply reactive power management and a generic formulation for the management of the startup and shutdown cycles of dispatchable units. Furthermore, a detailed modeling of BESS and DG units is presented, reflecting the actual behavior of the devices. The MG is modeled as a multi-busbar network, with the application of the power flow equations to establish the link between power flows and nodal voltages. All the constraints are linearized to formulate the EMS as a Mixed-Integer Linear Programming (MILP) optimization problem. The EMS is validated in a real facility: the CATEPS Microgrid Living-Lab. The results demonstrate the operational effectiveness of the EMS in different seasons, exhibiting a reduction in costs ranging from 21.84 % in summer to a 5.69 % in winter compared to a scenario with RES production but without energy management. In addition, a comprehensive examination of reactive power and voltage management is presented. Furthermore, an empirical assessment of the power flow equations linearization demonstrated minimal discrepancy in the results when compared with those obtained with the non-linear equations, exhibiting a mean absolute error of 8.8e-5 p.u. and 3.2e-5 rad in voltage magnitude and phase angle, respectively, in the most unfavorable scenario. A sensitivity analysis of the startup and shutdown cycles management of the BESS reveals a negligible effect on operational costs, yet it provides a mechanism for managing the battery stress by reducing the number of startups in a complete week from 28 to 16 in summer and from 37 to 24 in winter. The dependence between the maximum charging and discharging power on the state of charge of the BESS is also assessed in the use case.

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Cost-Effective Operation of Microgrids: A MILP-Based Energy Management System for Active and Reactive Power Control

Author: García Caro, Sebastián; Bracco, Stefano; Parejo Matos, Antonio; Fresia, Matteo; Guerrero Alonso, Juan Ignacio; León de Mora, Carlos
Publisher: Elsevier
Year: 2025
DOI: 10.1016/j.ijepes.2025.110458
Source: https://idus.us.es/bitstreams/60261614-1076-4aac-ae33-f7a55f8c620b/download
Cos -E ec i e Ope a ion o Mic og ids: A MILP-Based Ene gy Managemen
Sys em o Ac i e and Reac i e Powe Con ol
Sebas i´
an Ga cía
a,*
, S e ano B acco
b
, An onio Pa ejo
a
, Ma eo F esia
b
,
Juan Ignacio Gue e o
a
, Ca los Le´
on
a
a
Depa men o Elec onic Technology, Escuela Poli ´
ecnica Supe io , Uni e si y o Se ille, Se ille 41011, Spain
b
Depa men o Elec ical, Elec onic, Telecommunica ions Enginee ing and Na al A chi ec u e, Uni e si y o Genoa, Geno a 16145, I aly
ARTICLE INFO
Keywo ds:
Dis ibu ed Ene gy Resou ces
Ene gy Managemen Sys ems
Mic og ids
ABSTRACT
Mic og ids (MGs) ha e eme ged as a po en ial solu ion o he in eg a ion o Dis ibu ed Ene gy Resou ces
(DERs) in o he dis ibu ion ne wo k. In his sense, o e ec i ely manage MGs, i is essen ial o implemen Ene gy
Managemen Sys ems (EMSs). This en ails no only pe o ming he uni commi men bu also conside ing he
ol age and eac i e powe echnical cons ain s and managing ancilla y se ices. This pape con ibu es wi h a
comp ehensi e EMS o he op imal managemen o ac i e and eac i e powe o a gene ic g id- ied MG
composed o Renewable Ene gy Sou ces (RESs), Ba e y Ene gy S o age Sys ems (BESSs), Diesel Gene a o (DGs)
uni s and loads, wi h he goal o educing he ope a ing cos s o he acili y. The EMS includes models o he
powe elec onics uni s o apply eac i e powe managemen and a gene ic o mula ion o he managemen o
he s a up and shu down cycles o dispa chable uni s. Fu he mo e, a de ailed modeling o BESS and DG uni s is
p esen ed, e lec ing he ac ual beha io o he de ices. The MG is modeled as a mul i-busba ne wo k, wi h he
applica ion o he powe low equa ions o es ablish he link be ween powe lows and nodal ol ages. All he
cons ain s a e linea ized o o mula e he EMS as a Mixed-In ege Linea P og amming (MILP) op imiza ion
p oblem. The EMS is alida ed in a eal acili y: he CATEPS Mic og id Li ing-Lab. The esul s demons a e he
ope a ional e ec i eness o he EMS in di e en seasons, exhibi ing a educ ion in cos s anging om 21.84 % in
summe o a 5.69 % in win e compa ed o a scena io wi h RES p oduc ion bu wi hou ene gy managemen . In
addi ion, a comp ehensi e examina ion o eac i e powe and ol age managemen is p esen ed. Fu he mo e,
an empi ical assessmen o he powe low equa ions linea iza ion demons a ed minimal disc epancy in he
esul s when compa ed wi h hose ob ained wi h he non-linea equa ions, exhibi ing a mean absolu e e o o
8.8e-5 p.u. and 3.2e-5 ad in ol age magni ude and phase angle, espec i ely, in he mos un a o able scena io.
A sensi i i y analysis o he s a up and shu down cycles managemen o he BESS e eals a negligible e ec on
ope a ional cos s, ye i p o ides a mechanism o managing he ba e y s ess by educing he numbe o s a ups
in a comple e week om 28 o 16 in summe and om 37 o 24 in win e . The dependence be ween he
maximum cha ging and discha ging powe on he s a e o cha ge o he BESS is also assessed in he use case.
1. In oduc ion
In ecen yea s, he Eu opean Union has assumed a commi men o
he ene gy ansi ion. In 2021, he Fi o 55 package was enac ed by he
Eu opean ins i u ions, wi hin he amewo k o he Eu opean G een Deal
[1]. The package p omo ed some challenging goals o he membe
s a es o he 2030 yea , in e ms o educ ion o g eenhouse gas emis-
sions, pene a ion o Renewable Ene gy Sou ces (RESs) wi hin he
gene a ion po olio [2] and p omo ion o ene gy de i ing om RESs
and ene gy e iciency in buildings, which ep esen one o he mos
ene gy-consuming sec o s a Eu opean le el [3].
Following hese legisla i e cons ain s, membe s a es a e p omo ing
incen i es o os e he ins alla ion o a la ge sha e o RESs wi hin na-
ional gene a ion po olios, in eplacemen o synch onous gene a o s
ypically ins alled in adi ional coal o gas- i ed powe s a ions. RES
powe plan s, mainly ep esen ed by Pho o ol aic (PV) and Wind Tu -
bine (WT) ins alla ions, canno p o ide he same pe o mance as syn-
ch onous gene a o s in e ms o equency and ol age suppo [4],
* Co esponding au ho .
E-mail add ess: [email p o ec ed] (S. Ga cía).
Con en s lis s a ailable a ScienceDi ec
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems
jou nal homepage: www.else ie .com/loca e/ijepes
h ps://doi.o g/10.1016/j.ijepes.2025.110458
Recei ed 24 July 2024; Recei ed in e ised o m 25 Sep embe 2024; Accep ed 3 Janua y 2025
Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
A ailable online 10 Janua y 2025
0142-0615/© 2025 The Au ho s. Published by Else ie L d. This is an open access a icle unde he CC BY license ( h p://c ea i ecommons.o g/licenses/by/4.0/ ).
being connec ed o he dis ibu ion ne wo k h ough in e e s. Dedi-
ca ed con olle s mus be ins alled on in e e s o make hem pa icipa e
in equency and ol age suppo [5]. Mo eo e , PV and WT uni s a e
a ec ed by he inhe en unp edic abili y o he p ima y sou ce, he e-
o e being a ec ed by possible unexpec ed o e - o unde -p oduc ions.
Fo his eason, hese powe plan s a e usually coupled o s o age sys-
ems, ei he hyd oelec ic in la ge-scale applica ions [6] o Ba e y En-
e gy S o age Sys ems (BESSs) in small scale applica ions [7]. BESSs a e
able o abso b possible su plus RES p oduc ion du ing peak pe iods,
deli e ing i back o he ne wo k du ing low RES p oduc ion pe iods [8].
In eg a ed RES-BESS sys ems can pa icipa e in equency con ainmen
and es o a ion ese es [9]. In addi ion, BESSs mi iga e ol age luc-
ua ions ha may de i e om as a ia ions o RES powe ou pu [10].
A small scale, RESs and BESSs can be iden i ied as Dis ibu ed En-
e gy Resou ces (DERs): o example, in he esiden ial sec o , hese de-
ices a e ins alled in he nea by o buildings o on oo ops. Many DERs
a e connec ed o each o he , along wi h loads, Elec ic Vehicles (EVs)
cha ging s a ions and possible dispa chable gene a o s, such as mic o-
gas u bines o Diesel Gene a o s (DGs), in he so-called Mic og ids
(MGs) [11]. MGs may also be made up o plan s capable o p o iding
he mal and cooling ene gy, like boile s, Combined Hea and Powe
(CHP) uni s and Combined Cooling, Hea and Powe (CCHP) uni s
[12,13]. MGs a e usually ope a ed unde economic o en i onmen al
objec i es, aiming o minimize ope a ional cos s and/o CO
2
emissions.
Mo eo e , hey p o ide g ea e lexibili y o he dis ibu ion ne wo k, i
compa ed o he adi ional pa adigm [14]. Se e al di e en applica-
ions o he MG concep can be ound: emo e MGs ( o a -away a eas
and small islands), mobile MGs ( anspo able on aile ), MGs o mil-
i a y compounds, heal h ca e acili ies, and uni e si y campuses, MGs
o da a cen e s, MGs o po s and ai po s, e c. I is also impo an o
conside how many MG ins alla ions can now ake place in u ban a eas,
in all hose new neighbo hoods ha a e being c ea ed as consequence o
ede elopmen p ojec s on old indus ial si es. In hese new sus ainable
u ban dis ic s, local g een ene gy p oduc ion can help educe he ca -
bon oo p in o ci ies and imp o e he quali y o li e, as assessed in [15]
whe e he au ho s desc ibe he implemen a ion o a MG o eed a Posi-
i e Ene gy Dis ic (PED). In he c ea ion o hese new sus ainable
a eas, he placemen o dis ibu ed gene a ion mus be ca e ully e alu-
a ed o minimize he impac on he dis ibu ion ne wo k [16], e en
conside ing ex eme wea he e en s [17].
The op imal dispa ching o he uni s composing a MG is de ined by
an Ene gy Managemen Sys em (EMS), which is ypically he uppe le el
o a Supe iso y Con ol and Da a Acquisi ion Sys em (SCADA). EMSs
a e in cha ge, o example, o de ining he op imal scheduling o dis-
pa chable uni s and he op imal ac i e and eac i e powe p o ision by
DERs: o do his, capabili y cu es o in e e s mus be embedded wi hin
he EMS, as shown in [18], whe e hey a e modelled in acco dance wi h
I alian echnical s anda ds. Mo eo e , EMSs de ine he op imal p o ile o
powe exchange wi h he local dis ibu ion ne wo k, i he MG wo ks in
g id-connec ed mode; i needed, EMSs allow he MG o ope a e in
islanded mode, when equi ed by he dis ibu ion sys em ope a o .
Fu he mo e, EMSs a e used o op imally schedule he ope a ion o
BESSs and o apply EV sma cha ging s a egies. The complexi y o
EMSs is mainly due o he mul iple inpu da a ha need o be p o ided o
op imally un i . This means economic pa ame e s (elec ici y pu chase
and selling p ices, main enance cos s, RES cu ailmen cos s, e c.),
echnical da a (pe o mance cu es desc ibing he ope a ion o DG
plan s a pa ial load, lowe and uppe bounds o powe p oduc ion,
maximum and minimum cha ging and discha ging powe o BESSs
usually dependen on s a e o cha ge, e c.) and en i onmen al pa ame-
e s (emission ac o s, e c.) [15]. Mo eo e , EMSs a e usually coupled
wi h o ecas ing ools used o es ima e bo h loads (elec ical, he mal
and cooling) and enewable ene gy p oduc ion. Fo ins ance, in [19] a
machine lea ning p obabilis ic o ecas ing app oach wi h obus op i-
miza ion is p oposed o de ine op imal dispa ching o MGs ha ing a
high pene a ion o RESs, while in [20] he analysis ocuses on models
used o es ima e he loads in a MG. A sepa a e issue conce ns he
managemen o elec ic mobili y wi hin a MG, as highligh ed in [21],
whe e a s udy o a emo e island ed by a MG wi h se e al EV cha ging
poin s is epo ed, and in [22], whe e a me hod o imp o e he o e-
cas ing accu acy o EV cha ging demand is p oposed. I is e y di icul
o es ima e anspo demand, and so he EV cha ging needs, as i de-
pends no only on en i onmen al and echnical ac o s, bu also on
beha io al aspec s o mobili y use s.
1.1. Li e a u e e iew
Se e al examples o EMSs o MGs can be ound in he li e a u e. A
comp ehensi e e iew o hem is p esen ed in [23], and also in [24]
whe e an analysis o he di e en op imiza ion echniques used o
add ess he ene gy managemen p oblems in MGs is p oposed. A com-
pa ison o se e al ene gy managemen s a egies in MGs is also epo ed
in [25], by highligh ing he c i icali ies in managing in e mi en RESs
and he impo ance o applying demand esponse.
A la ge po ion o he s udies p esen in he li e a u e models he MG
as a single busba sys em and neglec he impac o eac i e powe . The
applica ion o single busba model implies ha all he powe lows
among buses and all he ele an ol age phenomena a e neglec ed.
Among he s udies p esen in he li e a u e, [26] p oposes an EMS o
op imally ope a e a MG loca ed in Egyp wi h WT, PV and DG uni s, wi h
he aim o minimizing cos s and emissions. In [27] and [28] he au ho s
p esen a day-ahead EMS o he op imal managemen o a public pos al
acili y, equipped wi h mic o WTs and a PV sys em, owning a lee o EVs
o he deli e y o eigh . E en hough hese pape s in oduce an
app oxima ion o model he capabili y cu es o in e e s o conside
eac i e powe , he p oposed model has he po en ial o esul in
in e e o e load si ua ions, as e idenced by he esul s. The au ho s o
[29] p opose an op imal managemen s a egy o a mul i-ene gy MG
ope a ing in ene gy ma ke s. The p oposed scheme is hie a chical, wi h
a lowe laye made o single mul i-ene gy MGs and wi h an uppe laye
ha coo dina es he MGs, applying a dynamic p ice mechanism, and
ha is in e aced wi h he dis ibu ion ne wo k. Ne e heless, a single
busba model is employed o desc ibe he opology o he MGs and
eac i e powe is neglec ed. A me hodology o op imally ope a e a BESS,
p o iding lexibili y o manage PV and WT a iabili y, is p o ided in
[30], o a acili y equipped wi h a mic o u bine and a DG, oo. The
pu pose o he s udy is o y o employ he BESS as he unique lexible
sou ce, no elying on he DG. Howe e , as in he p e ious s udies, he
MG is modelled as a single busba sys em and eac i e powe is
neglec ed.
O he s udies apply a mul i-busba model o MGs, o adhe e o eali y
in a be e way. Fo example, in [31] an EMS o a MG eeding esi-
den ial, comme cial and indus ial use s wi h PV, WT and BESS uni s is
p esen ed, conside ing he powe lows among buses bu neglec ing he
analysis o ol age phenomena, eac i e powe exchanges and no ying
o limi he numbe o cha ging and discha ging cycles o he BESS, ha
could educe i s use ul li e. The au ho s o [32] also conside a mul i-
busba model o p esen an EMS o wind a ms combined wi h BESS
and dis ibu ed gene a o s. The s udy conside s a limi a ion on he
s a up and shu down cycles. Howe e , his las wo k neglec s he
impac o eac i e powe and jus conside he managemen o ac i e
powe . A wo-laye coo dina ed EMS o op imally manage dis ibu ion
ne wo ks wi h g id-connec ed MGs is p oposed in [33]. The i s laye
op imizes he MG ope a ion while he second op imizes he dis ibu ion
ne wo k ope a ion. A mul i-busba model is used o model he MG.
Howe e , he managemen o BESS does no conside he ela ionship
be ween he SoC and he exchanged powe , so possible disc epancies
could appea in eal implemen a ions. In addi ion, like o he pape s, i
does no a emp o limi s a ups o sho pe iods o ime. Ano he s udy
ha p esen s he in eg a ion o a mul i-busba model wi hin he EMS is
[34], whe e he s udy case is a MG wi h DERs and RESs. In his las
pape , Op imal Powe Flow (OPF) cons ain s a e also conside ed. The
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
2
au ho s p opose a mul i-objec i e app oach, conside ing economic,
en i onmen al and powe quali y objec i es. Howe e , he p oblem is
non-linea (NLP) and non-con ex, equi ing me a-heu is ic op imiza ion
algo i hms o sol e i . In addi ion, BESSs a e no conside ed wi hin he
o mula ion, no assessing he p ominen ole ha hey will play in
scena ios wi h high RES pene a ion, due o hei lexibili y. Simila ly, in
[35] an EMS o he op imal dispa ching o mul i-mic og ids equi ing
me a-heu is ic op imiza ion algo i hms is p esen ed. The p oposal con-
side s PV, WT and BESS and models he mic og id as a mul i-busba
ne wo k. Howe e , he au ho s jus conside ac i e powe manage-
men , neglec ing he e ec o eac i e powe . In [36] he au ho s p o-
pose an EMS o manage i ual powe plan s connec ed o a dis ibu ion
ne wo k. The p oblem conside s RES and EV uni s’ managemen o
ac i e and eac i e powe managemen h ough he comple e OPF
equa ions. Howe e , he p oblem is non-linea and non-con ex,
equi ing high compu a ional imes and speci ic sol e s. A simila
app oach is p esen ed in [37] bu also conside ing hyd ogen s o age as a
po en ial solu ion o inc ease eliabili y and lexibili y o he ne wo k.
In [38] a mixed-in ege second-o de cone p og amming (MISOCP)
EMS o MGs inco po a ing RES, BESS and DG uni s is p oposed. The
o mula ion employs obus op imiza ion o asce ain he iabili y o he
p oposed solu ions. The EMS manages bo h ac i e and eac i e powe ,
employing a mul i-busba model wi h a con ex o mula ion o he OPF
equa ions. In [39], some o he same co-au ho s who con ibu ed o he
p e ious pape p esen ed a MINLP based EMS o islanded MGs ha was
la e linea ized as a MILP p oblem. This p oposal includes a mul i-
busba model, linea izing he OPF equa ions h ough he assump ion
o knowing es ima ed alues o ol ages and ac i e and eac i e powe
lows h ough lines. The p oposed app oach en ails a hie a chical so-
lu ion in which he MILP p oblem is ini ially sol ed and subsequen ly
he MINLP. While p oposals [38,39] a e comp ehensi e, hey lack any
s ipula ions p e en ing dispa chable uni s (BESS and DG) om mul iple
ac i a ions and deac i a ions in sho pe iods o ime, no ying o limi
he numbe o s a up and shu down cycles o hem, ha could educe i s
use ul li e. Addi ionally, he BESS model does no accoun o he ela-
ionship be ween maximum powe in cha ging/discha ging s a es and
he SoC, which could lead o inaccu a e solu ions ega ding he BESS
pe o mance.
To conclude his subsec ion and wi h he aim o p o ide a summa y
o he li e a u e e iew, Table 1 ou lines he p incipal a ibu es o each
o he pape s s udied in his subsec ion.
1.2. Con ibu ions
As a conclusion o he li e a u e e iew, ew pape s p opose a
comp ehensi e app oach o EMSs o MGs (see Table 1): some o hem
apply a single busba model o he MG, p e en ing he applica ion o
powe low equa ions and he assessmen o eac i e powe exchange by
RES in e e s and o he impac o RES p oduc ion luc ua ions on nodal
ol ages. O he pape s on he one hand apply a mul i-busba model o
he MG, including he OPF equa ions, bu on he o he hand do no
p o ide a de ailed insigh in o he ole ha BESSs and dispa chable DERs
play in MGs managemen , some o hem wi hou e en conside ing
eac i e powe con ol. I has been shown ha he in luence o s a up
and shu down cycles o dispa chable uni s (such as BESS o DGs) is o en
o e looked. Fu he mo e, he ela ionship be ween SoC and he powe
ha BESS can deli e is equen ly dis ega ded, which can esul in
inaccu a e assessmen s o BESS pe o mance. Many p oposals employ
non-con ex and non-linea o mula ions, equi ing heu is ic-based
sol e s o ob ain he solu ion o he p oblem. O he s u ilize con ex
quad a ic p og amming echniques, while ano he g oup employs hi-
e a chical app oaches. Fu he mo e, i has been obse ed ha he use-
cases p esen ed in he li e a u e a e ypically cons uc ed using syn-
he ic MGs. In addi ion, some o he pape s lack comp ehensi e in o -
ma ion ega ding he cha ac e is ics o he ne wo k o he asse s.
Gi en he s a e o he a , he aim o he p esen pape is o de ine a
comp ehensi e EMS o he op imal ope a ion o a g id- ied MG
composed o dis ibu ed RES uni s (PVs and WTs), dis ibu ed dis-
pa chable uni s (BESS and DGs) and loads, wi h he goal o educing he
ope a ing cos s o he acili y, and conside ing he limi a ions p e iously
iden i ied in he s a e-o - he-a . The EMS has been modelled as a Mixed-
In ege Linea P og amming (MILP) p oblem, o ensu e he exis ence o
an op imal solu ion and ha i ep esen s he global minimum. In
addi ion, linea o mula ions a e o en p e e ed o e con ex quad a ic
o mula ions due o hei simplici y and he ex ensi e suppo and
ma u i y o he sol e s ha a e a ailable. This app oach also educes he
compu a ional capaci y equi ed. Wi hin he EMS, dedica ed models o
powe elec onics uni s a e inse ed, aking in o accoun he capabili y
cu es o con e e s. This allows o conside he impac o eac i e
powe on he nodal ol age ampli udes, as well as managing po en ial
penal ies o eac i e powe exchange wi h he ex e nal g id. Powe low
equa ions a e linea ized and also included in he EMS o link powe
lows and nodal ol ages. Mo eo e , a de ailed model o BESS is
Table 1
Summa y o he li e a u e e iew. An emp y cell indica e ha he pape does no add ess he cha ac e is ic. The symbol ▴ deno es ha he pape discusses he use o
BESS bu does no conside he ela ion be ween exchanged powe and SoC. The symbol ◆ deno es ha he pape is using EVs as ene gy s o age. The symbol ■ deno es
ha he pape add esses he use o DGs bu does no conside he inhe en cons ain s o such sys ems.
Pape Op imiza ion
model
Reac i e
powe
con ol
OPF equa ions Implemen a ion o
in e e s’ capabili y
cu es
Limi s ON/OFF cycles
o dispa chable uni s
Use case DERs
PV WT BESS DG
[27,28] MILP ✔✔Syn he ic ✔ ✔ ◆
[29] Hie a chical
MILP
    Syn he ic ✔ ✔ ▴ ■
[30] Quad a ic
P og aming
    Syn he ic ✔ ✔ ▴ ■
[31] MILP Jus ac i e powe .   Syn he ic ✔ ✔ ▴
[32] MILP DC powe low ✔Syn he ic ✔▴✔
[33] Hie a chical
MILP
✔B ach equa ions
linea ized
✔Syn he ic ✔ ✔ ▴ ■
[34] Non-con ex NLP ✔Non-con ex equa ions   Syn he ic ✔ ✔  
[35] Non-con ex NLP Non-con ex equa ion
jus o ac i e powe
  Syn he ic ✔ ✔ ▴
[36,37] Non-con ex NLP ✔Non-con ex equa ions ✔Syn he ic ✔ ✔ ◆
[38] MISOCP ✔SOCP o mula ion ✔Syn he ic ✔ ✔ ▴✔
[39] Hie a chical
MILP-MINLP
✔Linea o mula ion
needing es ima ed g id
alues.
✔Syn he ic ✔▴✔
This
pape
MILP ✔✔ Nodal equa ions
linea ized
✔✔ ✔✔ Real
acili y
✔✔ ✔✔ ✔✔ ✔✔
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
3
p o ided, aking in o accoun he dependence o he maximum cha ging
and discha ging powe on he S a e o Cha ge (SoC) and conside ing
cons ain s on he numbe o cha ging, discha ging and shu down cy-
cles, needed o ex end he use ul li e o he ba e y. Rega ding DG
gene a o s, amp-up and amp-down cons ain s ha e been included in
he EMS o mula ion, along wi h maximum and minimum ope a ing
egimes, o mimic he eal beha iou o he de ice. A g aphical ep e-
sen a ion o he EMS ope a ion is depic ed in Fig. 1.
In o de o s eng hen he p oposed EMS, i s alida ion is ca ied ou
in he Mic og id Li ing-Lab ins alled a he CATEPS building o he
Highe Poly echnic School o he Uni e si y o Se ille, equipped wi h all
he a o emen ioned echnologies. The echnical cha ac e is ics o he
acili y (MG ne wo k and he asse s deployed) a e ex ensi ely com-
men ed, wi h he objec i e o acili a e hei use by o he esea che s.
Resul s a e he e p esen ed and deeply commen ed, showing he ope a-
ions o he MG in di e en seasons. Addi ionally, a de ailed ocus is
p o ided on eac i e powe and ol age managemen . An empi ical
alida ion o he powe low equa ions linea iza ion is also conduc ed,
compa ing he esul s ob ained unde bo h he linea ized and non-
linea ized o mula ions. Finally, he e ec o he minimum numbe o
ON/OFF cha ging and discha ging cycles and he dependence o powe
wi h he SoC in he BESS model is also e alua ed.
The main con ibu ions o he p esen pape a e ep esen ed by:
•Inclusion o dedica ed models o powe elec onics, which conside
capabili y cu es and powe ac o limi a ions, allowing he assess-
men o eac i e powe managemen .
•Comp ehensi e app oach o manage dispa chable uni s, whe eby
minimum ON/OFF pe iods a e conside ed in o de o a oid he
occu ence o mul iple s a ups and shu downs in sho pe iods o
ime.
•Applica ion o mul i-busba model o he MG, oge he linea ized
powe low equa ions. Valida ion o he equa ions h ough compa -
ison o he esul s wi h he comple e non-linea powe low
equa ions.
•De ailed modelling o BESS, conside ing echnical cha ac e is ics as
he ela ion be ween maximum powe in cha ging/discha ging
phases and SoC. Including a sensi i i y analysis on he limi a ion on
he s a up/shu down cycles limi a ion.
•Comp ehensi e app oach o manage DG uni s, aking in o accoun
he echnical cons ain s inhe en o such sys ems, conside ing i s
ope a ing condi ions, including amp-up/ amp-down a es, mini-
mum ope a ing egime, and he numbe o ON/OFF cycles.
•Applica ion o he EMS o a eal es -case, conside ing he cha ac-
e is ics o ac ual acili ies and a oiding he use o syn he ic use-
cases.
The pape is o ganized as ollows: Sec ion 2 de ails he ma hema ical
o mula ion o he EMS, Sec ion 3 desc ibes he CATEPS Mic og id
Li ing-Lab, employed as es case, Sec ion 4 p esen s and discusses he
esul s, while Sec ion 5 is dedica ed o conclusions and also p o ides
some possible u he de elopmen s o he s udy.
2. EMS ma hema ical o mula ion
In his sec ion, he ma hema ical model o he EMS is desc ibed. The
model is buil as a MILP op imiza ion p oblem, aking ad an age o i s
simplici y and he ex ensi e suppo and ma u i y o he sol e s ha a e
a ailable compa ed wi h o he kinds o con ex o mula ions. The
objec i e o he EMS is o minimize he ope a ional cos o he MG while
conside ing he echnical cons ain s o i , main aining he MG be ween
easible ope a ional limi s. The inpu s o he model a e he o ecas ed
powe p oduc ion o all he RES uni s, he SoC o he BESS a he
beginning o he op imiza ion cycle, he o ecas ed consump ion o MG,
he echnical pe o mance pa ame e s o all he ene gy sou ces o he
MG (powe a ings, amp-up/down p o iles, ne wo k admi ance ma ix,
e c.) and, o cou se, he pa ame e s ela ed o cos s. The ou pu s o he
model a e he powe p o iles (bo h ac i e and eac i e) o all dis-
pa chable uni s and he ol age phaso s and powe s a all he nodes o
he MG. Unless o he wise speci ied, all elec ical uni s p esen ed in his
pape a e exp essed in he pe -uni (p.u.) sys em, wi h SB and VB ep-
esen ing he base powe and base ol age, espec i ely. A posi i e alue
in a powe a iable indica es he injec ion o powe in o he node, while
a nega i e powe alue indica es he abso p ion o powe . The o mu-
la ion is p esen ed in a gene ic o m and can be applied o any MG. The
Fig. 1. G aphical ep esen a ion o he EMS ope a ion.
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
4
ime ho izon is ep esen ed by T, wi h ime being disc e ized in o N ime
s eps. The ime in e al be ween s eps is deno ed by Δ (Δ =T/N). In
gene al, a iables ha e wo supe sc ip s: he i s indica es he asse o
which i e e s (e.g., PV, BESS, DG, e c.) while he second desc ibes some
cha ac e is ic o he a iable. In he case o a gene al o mula ion
applicable o mul iple asse s, he supe sc ip symbol X is employed.
Subsc ip s se e o indica e he index o he gene a ing uni and he ime
index.
2.1. Powe elec onics uni model
In his subsec ion, he cons ain s ela ed o he asse s connec ed o
he MG by means o powe elec onics uni s (e.g. in e e s, ec i ie s,
and powe con e e s) a e p esen ed.
Fi s , hese asse s mus mee he powe a ing echnical limi s o he
powe elec onics (1) :
(SX,max
i)2≥ (PX
i, )2+ (QX
i, )2(1)
whe e PX
i, and QX
i, a e he ac i e and eac i e powe s o he i h asse
o echnology X a ime and SX,max
i he maximum appa en powe ha
can be deli e ed by he powe elec onics. Inequali y (1) is a quad a ic
exp ession, bu i can be linea ized conside ing ha he cons ain jus
de ines ha he hypo enuse (con o med by a igh iangle whose ca he i
a e P and Q) mus be equal o lowe han he appa en powe o he
in e e . This is he same as conside ing ha he appa en powe
deli e ed by he in e e mus be wi hin a ci cle o adius he maximum
a ing o i . The e o e, cons ain (1) can be linea ized by conside ing a
se o NPW linea cons ain s wi h he o m o (2). As NPW inc eases, he
se o cons ain s (2) becomes close o he non-linea capabili y cu e
(1). Thus, he highe NPW pa ame e he be e .
SX,max
i≥PX
i, cos(2
π
n/NPW)+QX
i, sin(2
π
n/NPW),∀n∈[1,NPW](2)
Second, powe elec onics uni s can ope a e only wi hin ce ain
powe ac o limi s. Conside ing ha ac i e powe could be posi i e o
nega i e, as could be he case o uni s ha include a ec i ie (e.g., he
ec i ie o a BESS), cons ain (3) mus hold o main ain he powe
ac o be ween easible limi s in he ou -quad an s:
− an(ϕX,PF
i)PX
i, ≤QX
i, ≤ an(ϕX,PF
i)PX
i, (3)
whe e ϕX,PF
i is ob ained as ϕX,PF
i=a ccos(PFX
i), being PFX
i he mini-
mum powe ac o a which he uni can ope a e. O cou se, he absolu e
alue unc ion is non-linea . Appendix A. shows he MILP implemen a-
ion o his unc ion. I he uni can only injec ene gy in o he g id, as is
he case o PV uni s, he absolu e alue unc ion i is no needed in
cons ain (3).
Las ly, i is necessa y o conside ha some uni s could deli e a
maximum ac i e powe alue (PX,max
i, )lowe han he nominal appa en
powe . Thus, i is necessa y o impose (4) o conside his possibili y. I
he uni canno abso b powe (e.g., a PV in e e ), he alue on he le -
hand side o (4) will be subs i u ed by ze o.
−PX,max
i≤PX
i, ≤PX,max
i(4)
In con as o o he models used in he li e a u e, he model p e-
sen ed in his subsec ion ensu es ha he powe elec onics ope a es
only wi hin i s capabili y cu e, he eby p e en ing bo h ou -o - ange
ope a ing zones and o e load condi ions.
2.2. Dispa chable uni s ON/OFF limi a ions
In his subsec ion, a se o cons ain s o s ablish minimum ON/OFF
pe iods o dispa chable uni s (e.g., BESS o DGs) a e p esen ed. This se
o cons ain s can be applied o all kinds o dispa chable uni s a ailable
in MGs. Howe e , hey only co e he case o dispa chable uni s wi h
PX
i, ≥0 (i.e., hey a e no bidi ec ional). Adap a ion in he case o bidi-
ec ional dispa chable uni s such as BESS is discussed in i s own sub-
sec ion.
In his sense, o a oid ha dispa chable uni s a e u ned ON/OFF
mul iple imes in sho pe iods o ime, cons ain (5) is in oduced o
main ain he i h uni o echnology X ON o a leas NX,on imes eps:
aX, on
i, ≤(1/NX,on)∑ +NX,on−1
k= aX,on
i,k(5)
whe e aX,on
i, is a bina y a iable indica ing ha he uni is ON a ime
s ep and aX, on
i, is a bina y a iable indica ing ha he uni has been
u ned ON a ime s ep . The alue o NX,on is ob ained as NX,on =
⌈TX,on/Δ ⌉, whe e ⌈x⌉ deno es he ceiling unc ion o x and TX,on is he
minimum ime ha he uni mus be ON.
Simila ly, i one wan s o impose ha he uni mus be main ained
OFF o a ce ain ime a e i has been u ned OFF, cons ain (6) could
also be included in he model o he dispa chable uni . In his case, aX, o
i,
is a bina y a iable deno ing ha he i h uni has been u ned OFF a
ime and NX,o ep esen s he numbe o ime s eps ha he uni mus
emain OFF.
aX, o
i, ≤1−(1/NX,o )∑ +NX,o −1
k= aX,on
i,k(6)
To ob ain he bina y a iable aX,on
i, indica ing whe he he uni is ON
o OFF, classical big-M cons ain s in (7) and (8) a e imposed:
PX
i, ≥∊−M(1−aX,on
i, )(7)
PX
i, ≤MaX,on
i, (8)
whe e M is a big posi i e numbe and ∊ a small posi i e ole ance o
simula e a >inequali y.
In addi ion, cons ain s (9) and (10) a e included in he uni model o
ob ain he bina y a iables ha indica e when he uni has been u ned
ON o OFF:
aX, on
i, −aX, o
i, =aX,on
i, −aX,on
i, −1(9)
aX, on
i, +aX, o
i, ≤1 (10)
2.3. Renewable ene gy sou ce uni s
The ac i e powe gene a ion p o iles o he RES uni s (e.g., PVs o
WTs) a e inpu s o he model (ob ained h ough o ecas ing ech-
niques). Howe e , in he case o eac i e powe , RES uni s can adap he
injec ion/abso p ion o he g id by means o he powe in e e s. Thus
QX
i, o RES uni s is a decision a iable. O cou se, his is possible i he
in e e a ing cons ain s a e me . The e o e, i is possible o use he
RES in e e as a eac i e ene gy dispa chable uni including a se o
cons ain s as (2) and (3) in he model.
2.4. Ba e y ene gy s o age sys em
In his subsec ion, he model o he BESS uni s is in oduced. Fi s ,
since he BESS is connec ed by means o an in e e / ec i ie o he
elec ic ne wo k, a se o cons ain s (2) o (4) a e included. In addi ion,
as a dispa chable asse , a se o cons ain s desc ibed in subsec ion 2.2
mus be included o con ol he ON/OFF cycles o he uni . Howe e , as
s a ed be o e, hese cons ain s only conside he case o dispa chable
uni s ha only injec ac i e powe in o he g id (e.g., DGs o CHPs).
Thus, i he uni is a ba e y ha can discha ge (injec ) o cha ge
(abso b), hese cons ain s only co e he discha ging case. The e o e, i
is necessa y o add ano he se o cons ain s (5)-(6) and (9)-(10) o
model he cha ging case. The supe sc ip on in he bina y a iables mus
be eplaced by ch and dis in each o he wo se s o cons ain s o
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
5

dis inguish he cha ging and discha ging a iables. Mo eo e , di e en
numbe o minimum cha ging (NBESS,on,ch,NBESS,o ,ch) and discha ging
cycles (NBESS,on,dis,NBESS,o ,dis) could be de ined. In addi ion o hese,
cons ain s (11) and (12) mus be included o ob ain he aBESS,ch
i, bina y
a iable, which indica es whe he he uni is in a cha ging s a e. O
cou se, cons ain (13) mus hold be ween ch and dis a iables. I bo h
a iables a e ze o, he uni is OFF. Thus, he bina y a iable aBESS,on
i, ha
indica es i he uni is ON o OFF is ob ained wi h he equali y (14).
−PBESS
i, ≥∊−M(1−aBESS,ch
i, )(11)
−PBESS
i, ≤MaBESS,ch
i, (12)
aBESS,dis
i, +aBESS,ch
i, ≤1 (13)
aBESS,dis
i, +aBESS,ch
i, =aBESS,on
i, (14)
The ene gy model o he BESS is p esen ed in (15):
WBESS
i, +1=WBESS
i, −Δ (PBESS
i, (aBESS,ch
i,
η
ch
i+aBESS,dis
i, (1/
η
dis
i))+WBESS
i,
τ
BESS,sd
i)(15)
whe e WBESS
i, is he ene gy s o ed by he i h uni a ime ,
η
ch
i and
η
dis
i
a e he e iciency while cha ging and discha ging, espec i ely; and
τ
BESS,sd
i is he sel -discha ge loss exp essed as he pe uni loss o s o ed
ene gy pe hou .
As can be no iced, (15) is a non-linea unc ion due o he p oduc o
con inuous a iable PBESS
i, wi h bina y a iables aBESS,ch
i, and aBESS,dis
i, o
model he selec ion o cha ging/discha ging e iciencies. These non-
linea e ms can be linea ized by subs i u ing hem by wo auxilia y
con inuous a iables gBESS,dis
i, ≜aBESS,dis
i, PBESS
i, and gBESS,ch
i, ≜aBESS,ch
i, PBESS
i, ,
ob ained as desc ibed in Appendix B. Wi h his subs i u ion, (16) is he
linea equi alen o (15).
WBESS
i, +1=WBESS
i, −Δ (gBESS,ch
i,
η
ch
i+gBESS,dis
i, (1/
η
dis
i)+WBESS
i,
τ
BESS,sd
i)(16)
Cons ain s (17) and (18) a e included o limi he maximum and
minimum s a e o cha ge he ba e y can each:
WBESS
i, ≤WBESS,cap
iSoCBESS,max
i(17)
WBESS
i, ≥WBESS,cap
iSoCBESS,min
i(18)
whe e SoCBESS,max
i and SoCBESS,min
i a e he maximum and minimum SoC
he ba e y can each and WBESS,cap
i is he a ed capaci y o he ba e y.
The minimum powe a which he BESS mus ope a e, bo h in
cha ging and discha ging mode, can be de ined wi h cons ain s (19)
and (20). O cou se, i wan ed, di e en minimum alues could be
es ablished o he cha ging and discha ging cases.
PBESS
i, ≥ − PBESS,min
iaBESS,ch
i, (19)
PBESS
i, ≤PBESS,min
iaBESS,dis
i, (20)
In addi ion, he ela ionship be ween he SoC and he maximum
powe a which he ba e y can be cha ged/discha ged mus be
conside ed. Typically, when cha ging om a low SoC, he maximum
a ed powe can be deli e ed o he ba e y. Howe e , when a ce ain
SoC is eached while cha ging, he maximum powe accep ed by he
BESS s a s o dec ease un il i eaches i s ull capaci y. Simila ly, when
discha ging om a high SoC, he maximum a ed powe can be ex ac ed
om he ba e y. Howe e , when a ce ain SoC is eached while dis-
cha ging, he maximum powe ha can be ex ac ed om he BESS
s a s o dec ease un il i eaches i s minimum capaci y.
This beha io can be modeled by de ining wo addi ional linea
cons ain s linking he SoC wi h he powe exchanged by he BESS.
Speci ically, inequali y (21) models he cha ging scena io while (22)
models he discha ging one. In hese cons ain s, mBESS,ch
i and mBESS,dis
i
a e wo cons an s ob ained om equa ions (23) and (24), whe e Lch
i and
Ldis
i a e he SoC limi s a which injec ed/abso bed powe s a s o
dec ease. This o mula ion di e s om o he s in he li e a u e in ha i
a oids he use o piecewise unc ions, which conside s condi ional
o mula ion, in oducing mul iple bina y a iables. In his sense, his
o mula ion jus in oduces wo linea inequali ies in o he p oblem,
educing compu a ional e o .
PBESS
i, ≥mBESS,ch
i(SoCBESS
i, −1)(21)
PBESS
i, ≤mBESS,dis
iSoCBESS
i, (22)
mBESS,ch
i=PBESS,max
i/(1−Lch
i)(23)
mBESS,dis
i=PBESS,max
i/Ldis
i(24)
As a summa y o he BESS ope a ion, Fig. 2 shows g aphically he
easible ope a ional ange de ined by he cons ain s p esen ed in his
subsec ion.
2.5. Diesel gene a o s
As a dispa chable uni , he model o he DG mus complain wi h he
es ic ions imposed in subsec ion 2.2 o limi he ON/OFF cycles. Thus,
a se o cons ain s like he ones om (5) o (10) a e included o each
DG uni .
In addi ion o he minimum ON/OFF ime limi a ions, due o he
na u e o DGs, cons ain s (25) and (26) a e included o limi he amp-
up (PDG,RU
i) and amp-down (PDG,RD
i) a es espec i ely. The wo a o e-
men ioned pa ame e s a e gi en in W/h in he da ashee s (subsequen ly
ans o med in o he pe -uni sys em as all he a iables in he EMS
o mula ion).
PDG
i, −PDG
i, −1≤Δ PDG,RU
i(25)
PDG
i, −1−PDG
i, ≤Δ PDG,RD
i(26)
Mo eo e , DGs usually ha e a minimum powe ope a ing egime. To
each his ope a ing egime, hey need a ce ain pe iod o ime in he
s a up. In a simila way, hey may need a ce ain ime o shu down.
Thus, o conside his possibili y, cons ain (27) is used o es ablish a
minimum powe in he s a iona y ope a ing egime.
⎛
⎝aDG
i, −∑
k= −NDG, on −1
aDG, on
i,k−∑
+NDG, o −1
k=
aDG, o
i,k⎞
⎠PDG,min
i≤PDG
i, ≤PDG,max
(27)
The le -hand side o he inequali y es ablishes a minimum powe
injec ion in he s a iona y egime. The minimum powe injec ion is
deac i a ed when he uni is OFF o when he uni is in he s a up/
shu down pe iods. Speci ically, he minimum powe injec ion is deac-
i a ed o NDG, on and NDG, o imes eps o he s a up and shu down
espec i ely. These a iables a e ob ained as (28) and (29) espec i ely:
NDG, on =⌈PDG,min
i/(Δ PDG,RU
i)⌉ (28)
NDG, o =⌈PDG,min
i/(Δ PDG,RD
i)⌉ (29)
whe e ⌈x⌉ deno es he ceiling unc ion o x. I is wo h men ioning
ha (27) implici ly imposes ha NDG,on ≥NDG, on +NDG, o mus be
sa is ied o he uni o ope a e. Fig. 3 shows g aphically he in e p e-
a ion o he a iables desc ibed in his subsec ion.
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
6
Finally, he p oduc ion cos o he i h DG uni a ime (CDG
i, ) is
p esen ed in (30):
CDG
i, =c uelSBΔ (aDG
i,
ρ
iPDG,n
i+
σ
iPDG
i, )(30)
whe e c uel is he uel cos (in
€
/L),
ρ
i and
σ
i a e he uel in e cep and
he uel slope ob ained om he da ashee o he DG (bo h uni s in
L/kWh) [40,41], PDG,n
i is he nominal powe o he uni and SB is he base
powe used in he pe -uni ope a ions.
2.6. Elec ic ne wo k model
The simples way o model he elec ic ne wo k o a MG is o use a
single bus ep esen a ion, in which all asse s a e connec ed o he same
elec ical poin . As e idenced in he in oduc ion, his is he mos
common app oach obse ed in he li e a u e. Despi e he simplici y o
his modeling app oach, which me ely in oduces wo cons ain s o
ensu e he balance o ac i e and eac i e powe s, i ails o conside he
link be ween powe lows (ac i e and eac i e) and nodal ol ages.
Addi ionally, i dis ega ds he echnical cons ain s associa ed wi h
elec ical a iables, such as ol age limi s. To add ess his limi a ion, he
p oposed EMS inco po a es he powe low equa ions in o he o mu-
la ion. Howe e , powe low equa ions a e non-linea . Thus, in his
subsec ion, a linea ized e sion o he powe low equa ions is
p esen ed.
Conside ing a MG wi h Nn nodes (o buses), he complex powe
phaso Si, a node i and ime is gi en by (31):
Si, =Vi, Ii,
*=Vi, ∑Nn−1
k=0Yik
*Vk,
*(31)
whe e Vi, and Ii, a e he ol age and injec ed cu en phaso s a node
i, while Yik deno es he i,k elemen o he ne wo k admi ance ma ix. I
should be no ed ha * ep esen he complex-conjuga e. As usual in
powe low no a ion, he powe a nodes i=0,⋯,(Nn−1)is composed
by he sum o he ne injec ed powe s o he elemen s connec ed o ha
node. Node 0 is designa ed as he slack o he ne wo k ( e e ence bus),
wi h V0, =1∠0 (p.u.). In his sense, he Poin o Common Coupling
(PCC) o he MG wi h he dis ibu ion ne wo k will be conside ed he
slack node.
As s a ed, (31) is non-linea . A possible linea iza ion o i is o ob ain
he i s o de Taylo expansion cen e ed a ope a ional poin V=
1∠0p.u.. The esul o his linea iza ion is shown in (32).
Si, ≈∑Nn−1
k=0Yik
*+(∑Nn−1
k=0Yik
*)(Vi, −1∠0)+∑Nn−1
k=0(Yik
*(Vk, −1∠0))
(32)
In low- ol age ne wo ks, shun admi ances a e insigni ican and can
be neglec ed. Thus, he sum o elemen s a columns (and ows) in he
admi ance ma ix is ze o, simpli ying (32) o (33).
Si, =∑Nn−1
k=0Yik
*(Vk,
*−1∠0)(33)
Equa ion (33) can be ew i en in ec angula o m as (34) consid-
e ing ha i he pe uni sys em is adop ed and ope a e in adians,
Vi, =Vi, ∠δi, can be app oxima ed as Vi, ≈Vi, +jδi, , being Vi, and δi,
he ol age magni ude and phase angle a node i and ime . In his
con ex , j is he imagina y uni . This is a alid app oxima ion when
ol age magni ude alues a e no oo a om he base alue and phase
angle di e ences ac oss lines a e no la ge, as is he case o small size
elec ical ne wo ks as MGs (Re(Vi, )=Vi, cos(δi, )≈Vi, and Im(Vi, )=
Vi, sin(δi, )≈δi, ).
Spli ing he eal and imagina y pa s in (34) and se ing ΔVk, =
Vk, −1, equa ions (35) and (36) a e he linea ized powe low equa ions
o he ac i e and eac i e powe s a node i and ime . Whe e Gik and Bik
a e he conduc ance and suscep ance o he b anch be ween nodes i and
k, espec i ely. Consequen ly, a se o Nn cons ain s o each ime in-
e al in he o m o (35) and (36) a e included in he model o conside
he elec ical ne wo k o he MG. A alida ion o he linea iza ion o he
powe low equa ions will be p esen ed in he esul s sec ion.
Fig. 2. Feasible ope a ional egions o he BESS.
Fig. 3. DG s a up and shu down a iables.
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
7
Pi, +jQi, =∑Nn−1
k=0(Gik −jBik)(Vk, −1)−∑Nn−1
k=0(Gik −jBik)jδk, (34)
Pi, =∑Nn−1
k=0(GikΔVk, −Bikδk, )(35)
Qi, = − ∑Nn−1
k=0(Gikδk, +BikΔVk, )(36)
In oducing he ne wo k model in o he op imiza ion p ocess allows
o include sui able ol age and phase angle bounds o ensu e he p ope
ope a ion o he MG (37)-(38).
Vmin ≤Vi, ≤Vmax (37)
δmin ≤δi, ≤δmax (38)
Finally, he cos o bo h ac i e and eac i e powe abso bed/deli -
e ed om/ o he dis ibu ion ne wo k (i.e., a node 0) a ime is p e-
sen ed in equa ion (39):
Cg id
=SBΔ (P0, (cP,buy
(1−aP
0, )+cP,sell
aP
0, )+Q0, (cQ,buy
(1−aQ
0, )
−cQ,sell
aQ
0, )) (39)
whe e cP,buy
and cP,sell
a e he cos and e enue o ac i e powe ene gy
a ime espec i ely while cQ,buy
and cQ,sell
a e he penal ies o eac i e
powe abso p ion and injec ion espec i ely. The bina y a iables aX
0,
a e employed o indica e whe he ac i e powe (supe sc ip P) o eac-
i e powe (supe sc ip Q) is lowing in o (aX
0, =1) o om (aX
0, =0)
he dis ibu ion ne wo k. These a iables a e ob ained using cons ain s
as (7) and (8). As always, SB is he base powe used in he pe -uni
ope a ions.
As can be no iced, (39) is non-linea due o he mul iplica ion o he
bina y a iables aX
0, wi h he ac i e and eac i e powe con inuous de-
cision a iables o model he selec ion o buying o selling cos s. As
happened in he ba e y model, he p oduc o bina y wi h a con inuous
a iable can be linea ized by de ining an auxilia y a iable ob ained as
explained in Appendix B. Thus, ob aining wo auxilia y a iables gP
0, ≜
aP
0, P0, and gQ
0, ≜aQ
0, Q0, , equa ion (39) can be ew i en in a linea o m
as (40):
Cg id
=SBΔ (cP,buy
(P0, −gP
0, )+cP,sell
gP
0, +cQ,buy
(Q0, −gQ
0, )−cQ,sell
gQ
0, )(40)
2.7. Objec i e unc ion
The objec i e o he model is o minimize he ope a ional cos s o he
MG. In o he wo ds, he objec i e is o ind he solu ion ha educes he
o al p ice paid o ene gy subjec o he cons ain s o he de ice models
desc ibed in his sec ion. In his sense, wo p ima y sou ces o economic
expenses a e p esen in he MG model: he cos o he ene gy exchanged
wi h ex e nal g id and he cos o he uel o he DGs. Thus, he objec i e
unc ion can be desc ibed as ollows:
min∑N−1
=0(Cg id
+∑NDG−1
i=0CDG
i, )(41)
whe e Cg id
and CDG
i, a e he cos o he elec ical ene gy exchanged
wi h he dis ibu ion ne wo k (eq. (40)) and he cos o he uel o he i
h DG (eq. (30)), espec i ely. N and NDG deno e he numbe o imes eps
o he op imiza ion ho izon (N=T/Δ ) and he numbe o DG uni s in
he MG, espec i ely.
3. Use case: CATEPS Mic og id Li ing-Lab
The expe imen al alida ion o he p oposed EMS has been ca ied
ou in he Mic og id Li ing-Lab deployed a he CATEPS building o he
Highe Poly echnic School o he Uni e si y o Se ille. This ecen ly
cons uc ed building houses he labo a o ies, adminis a i e a eas and
o ices o he Poly echnic School.
The CATEPS building is shown in Fig. 4. The building is composed o
h ee dis inc sec ions: an open-plan labo a o y a ea, an adminis a i e
zone, and he o ices and esea ch labo a o ies. The open-plan labo a-
o y is loca ed on he wes side, whe eas he adminis a i e a ea is
loca ed on he eas side. Bo h a eas a e wo independen h ee- loo sub-
buildings, sepa a ed by a pa io. On op o hese wo s uc u es, ou
h ee- loo sub-buildings a e si ua ed ans e sally, housing o ices and
esea ch labo a o ies (see Fig. 4).
The Mic og id Li ing-Lab is a Sma G id es bed in eg a ed in o he
building’s h ee-phase low- ol age ne wo k, which is connec ed o he
medium ol age dis ibu ion ne wo k h ough i s own seconda y dis-
ibu ion subs a ion. The mic og id was ully ope a ional a he begin-
ning o 2023. The Mic og id Li ing-Lab ne wo k can be modeled as a
adial g id wi h wel e busba s. Fig. 5 shows he single-line model o he
MG. In his ci cui model, he o al ene gy consump ion o he six p e-
iously desc ibed a eas o he building is ep esen ed as six single
agg ega ed loads connec ed each one o i s co esponding node. In his
sense, he load a N1 comp ises he consump ion o he open-plan lab-
o a o y, he load a N2 he consump ion o he adminis a i e a ea and
he loads a N4 o N7 he consump ion o each o he ou ans e sal
sub-buildings espec i ely. The consump ion a hese nodes comp ises a
conside able numbe o indi idual loads, some o hem h ee-phase and
o he s single phase. The la e a e dis ibu ed equally in all phases in
acco dance wi h Spanish egula ions [42]. Consequen ly, he agg ega e
load a he a o emen ioned nodes is p edominan ly balanced when all
hese loads a e combined.
The asse s deployed in he CATEPS Mic og id Li ing-Lab a e depic-
ed in Fig. 6. The lis o he elemen s and he echnical speci ica ions o
hem a e p o ided below:
•A o al o ou PV ields, each comp ising 28 PV panels a anged in
wo s ings. The panels a e monoc ys alline o Passi a ed Emi e
and Rea Cell (PERC) echnology, each one wi h a a ed powe o
650Wp. Each PV ield has a h ee-phase in e e wi h a a ed powe
o 15kVA. The ou PV ields a e o equal speci ica ions and a e
ins alled in he same moun ing posi ion and wi h he same azimu h
angle.
•A BESS composed o six 48Vdc Li hium I on Phospha e (LiFePO4)
ba e y packs connec ed in pa allel. Each ba e y pack has a nominal
capaci y o 280Ah. The BESS is equipped wi h six single-phase in-
e e s/ ec i ie s, which a e connec ed in wo g oups o h ee and
synch onized o o m a h ee-phase sys em. Each in e e / ec i ie
has a a ed powe o 10kVA.
Fig. 4. CATEPS building. The Mic og id Li ing-Lab is deployed in his building.
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
8
•Two H-Type Da eus e ical WTs, each wi h a a ed powe o 3kWp.
Bo h WTs a e managed by he same in e e wi h a a ed powe o
5kVA.
•One DG wi h bo h on-g id and backup capabili ies. The DG is con-
s uc ed wi h a ou -s oke V16 diesel engine and an 800kVA h ee-
phase gene a o .
•A con ol oom equipped wi h a SCADA sys em o moni o ing plan
ope a ions and da a collec ion.
3.1. Inpu pa ame e s and es scena ios
In his subsec ion, he inpu pa ame e s o he EMS a e desc ibed.
The EMS ope a es wi h a ime ho izon o T=24 h wi h aΔ =15 min
imes ep, esul ing in 96 imes eps pe op imiza ion ho izon. The ac i e
powe p oduc ion o he RESs and he load consump ion (bo h ac i e
and eac i e) a e p o ided by de e minis ic machine lea ning
o ecas ing echniques [43]. I should be no ed ha , al hough a ixed
op imiza ion ho izon wi hou o e lapping has been selec ed o ob ain
he esul s, he e is no inhe en limi a ion in he o mula ion o be
implemen ed in a olling-ho izon app oach, he eby educing possible
impac s o s ochas ici y in enewable ene gy sou ces (RES).
As men ioned abo e, he g id is modeled as a wel e-bus ba ne wo k
as shown in Fig. 5. The cha ac e is ics o each b anch a e epo ed in
Table 2. The bus ba N0 is conside ed he slack o he ne wo k (V0 =1p.
u., δ0=0 ad). The ol age and powe bases o he pe uni ope a ions
a e 400 V and 30kVA espec i ely (nominal line ol age o he g id and
maximum powe o he BESS espec i ely). The ol age limi s (Vmin,
Vmax) ha e been se o be be ween 0.95 and 1.05p.u. while he ol age
phase limi s (δmin,δmax) ha e been se o be be ween −0.1 and 0.1 ad.
PV ields a nodes N8 o N11 ha e a maximum powe a ing o
SPV,max
i =15kVA and PPV,max
i =15 kW. The minimum powe ac o a
which PV in e e s can ope a e is PFPV
i =0.85 (bo h induc i e and
capaci i e). The WT in e e has a maximum powe a ing o SWT,max
1 =
5kVA and PWT,max
1 =5 kW. The WT in e e can ope a e a a minimum
powe ac o o PFPV
i =0.8 (bo h induc i e and capaci i e). In bo h RES
uni s, eac i e powe QX
i, is a decision a iable subjec o cons ain s (2)-
(3).
The BESS a node N3 has a a ed capaci y o WBESS,cap =80.64kWh.
Fig. 5. CATEPS Mic og id Li ing-Lab ne wo k model.
Fig. 6. Asse s deployed a he CATEPS Mic og id Li ing-Lab.
Table 2
Cha ac e is ics o each o he b anches o he mic og id.
B anch Cable Type Leng h (m)
N0-N1 RZ1-K(AS) 4x(3x150mm) 36
N1-N2 RZ1-K(AS) 4x(3x150mm) 5
N2-N3 RZ1-K(AS) 4x50mm 21
N2-N4 RZ1-K(AS) 4x70mm 34
N2-N5 RZ1-K(AS) 4x(2x95mm) 31
N2-N6 RZ1-K(AS) 4x70mm 57
N2-N7 RZ1-K(AS) 4x150mm 60
N4-N8 RZ1-K(AS) 4x10mm 54
N5-N9 RZ1-K(AS) 4x10mm 77
N6-N10 RZ1-K(AS) 4x6mm 57
N7-N11 RZ1-K(AS) 4x6mm 57
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
9
in he ba e y is close o he minimum le el (SoCBESS,min
i), he maximum
powe ha could p o ide he BESS would be limi ed by he emaining
ene gy s o ed, he ime in e al Δ and he e iciency o he powe
elec onics. Fo he discha ging case, his implici cons ain can be
exp essed by he inequali y (43). The unc ion o he g ay do ed line in
Fig. 15 can now be elucida ed: i co esponds o his implici cons ain .
In a simila way, inequali y (44) ep esen s he implici cons ain o
he cha ging case. In con as o he discha ge case, his cons ain has a
minimal e ec in he case shown in Fig. 15 (g ay do ed line in he
discha ge a ea). This is because he maximum allowed SoC is close o
100 % han he minimum allowed SoC is om 0 %.
PBESS
i, ≤
η
dis
i(SoCBESS
i, −SoCBESS,min
i)WBESS,cap
i
Δ (43)
PBESS
i, ≥(SoCBESS
i, −SoCBESS,max
i)WBESS,cap
i
η
ch
iΔ (44)
As a conclusion o his subsec ion, he co ec ope a ion o he
cons ain s ha ha e been included in o he EMS o link he s a e o
cha ge (SoC) o he maximum powe ha can be exchanged by he BESS
has been alida ed. Howe e , depending on he SoC limi s, cons ain s
(43)-(44) may be mo e es ic i e.
5. Conclusions
The inc easing p esence o DERs equi es he implemen a ion o an
e ec i e managemen s a egy. MGs o e an e ec i e solu ion o he
in eg a ion o RESs, BESS uni s, CCHP uni s, DG uni s, e c. in he dis-
ibu ion ne wo k.
This pape con ibu es wi h a comp ehensi e EMS o he op imal
ope a ion o gene ic g id- ied MGs, wi h he objec i e o educing he
ope a ional cos s. The p oposed EMS conside s se e al key aspec s,
including ac i e and eac i e powe managemen , he applica ion o
powe low equa ions, he use o speci ic models o powe elec onics
uni s and dispa chable uni s, and he in eg a ion o de ailed de ice
models o BESSs and DGs. In o de o educe he compu a ional
equi emen s while ensu ing he exis ence o an op imal solu ion ha
ep esen s he global minimum, he EMS is o mula ed as a MILP op i-
miza ion p oblem. Consequen ly, all he cons ain s ha e been
linea ized.
The main unc ionali ies o he p oposed EMS ha e been assessed in a
use case ha in ol es a ep esen a i e acili y: he CATEPS Mic og id
Li ing-Lab. The EMS ope a ion o he MG was e alua ed in di e en
seasons which showed a signi ican cos educ ion in he MG ope a ion
when using he p oposed EMS, especially in he summe (21.84 %) and
sp ing (14.84 %) scena ios. Fu he mo e, he ope a ion o he DG in he
p oposed scena ios was examined. The indings indica ed ha , gi en he
size o he DG and he cu en load o he building in ques ion, i s
ope a ion becomes economically iable only when elec ici y p ices
each ele a ed le els.
A de ailed ocus was gi en o eac i e powe and ol age manage-
men , showing he capaci y o RES o compensa e o eac i e powe ,
ensu ing he ope a ional limi s o he in e e s. Fu he mo e, o alida e
he linea iza ion o he powe low equa ions, a compa ison was con-
duc ed be ween he p oposed powe low equa ions and he comple e
non-linea ones. In his sense, he ol age esul s (magni ude and angle)
ob ained by he p oposed EMS we e hen con as ed wi h hose yielded
by a powe low sol e employing he comple e non-linea equa ions.
The MAE me ic demons a ed minimal disc epancies be ween he
linea and non-linea equa ions: 8.8e-5 p.u. and 3.2e-5 ad o ol age
magni ude and phase angle espec i ely; he eby p o ing he e ec-
i eness o he p oposed app oach.
The dispa chable uni s ON/OFF model cons ain s we e assessed
using he BESS as a case s udy, which demons a ed he abili y o he
p oposed model o modula e he s a up and shu down pe iods o he
de ice. The esul s indica ed ha he ON/OFF pa ame e s had an
impe cep ible impac on he ope a ing cos s and on he o al ene gy
exchanged by he BESS. This inding sugges s ha he echnical limi a-
ions o he de ice can be add essed while main aining a minimal impac
on he ope a ional cos . Fo ins ance, he o al numbe o s a ups in a
ypical win e week was educed om 37 o 24 while he di e ence in
ope a ional cos s jus inc eased by 0.22
€
, wi h he o al ene gy
exchanged by he BESS emaining almos cons an in bo h scena ios
( om 1657.17kWh o 1656.57kWh). Fu he mo e, he dependence
Fig. 15. Ac i e powe exchanged by he BESS as unc ion o he SoC. The g ay lines ep esen he ope a ional limi s de ined in he BESS model.
S. Ga cía e al.
In e na ional Jou nal o Elec ical Powe and Ene gy Sys ems 165 (2025) 110458
16

be ween he maximum cha ging and discha ging powe on he SoC was
also e alua ed. The esul s alida ed he linea model in oduced o
implemen his ela ionship. Mo eo e , he esul s showed ha he
inhe en ela ionship be ween he a ailable ene gy in he BESS and he
maximum powe may be mo e es ic i e, depending on he maximum
and minimum SoC and on he del a ime adop ed in he op imiza ion
p ocess.
Fu u e esea ch will add ess he impac o he o ecas accu acy due
o he inhe en s ochas ici y o RESs. This will in ol e explo ing po-
en ial solu ions o mi iga e his aspec using p obabilis ic o ecas ing
echniques and a olling ho izon op imiza ion app oach, wi h he aim o
dynamically upda ing he EMS execu ion. The p oposed EMS is in ended
o a e ia y con ol o g id-connec ed MGs, u u e esea ch will also
add ess he inclusion o seconda y and p ima y con ol (p- and -q
con ol) o suppo he ope a ion o he CATEPS MG in islanded mode as
well as he in eg a ion o he p oposed EMS in o he SCADA sys em.
CRediT au ho ship con ibu ion s a emen
Sebas i´
an Ga cía: W i ing – o iginal d a , So wa e, Me hodology,
In es iga ion, Fo mal analysis, Da a cu a ion, Concep ualiza ion. S e-
ano B acco: W i ing – o iginal d a , Valida ion, In es iga ion. An o-
nio Pa ejo: W i ing – e iew & edi ing, Visualiza ion, Valida ion.
Ma eo F esia: W i ing – o iginal d a , Valida ion, In es iga ion. Juan
Ignacio Gue e o: W i ing – e iew & edi ing, Resou ces, P ojec
adminis a ion, Da a cu a ion. Ca los Le´
on: W i ing – e iew & edi ing,
Supe ision, P ojec adminis a ion, Funding acquisi ion.
Decla a ion o compe ing in e es
The au ho s decla e ha hey ha e no known compe ing inancial
in e es s o pe sonal ela ionships ha could ha e appea ed o in luence
he wo k epo ed in his pape .
Acknowledgemen s
The publica ion is pa o he p ojec TED2021-129702B-I00, unded
by MICIU/AEI/10.13039/501100011033 and he Eu opean Union
“Nex Gene a ionEU”/PRTR.
Appendix A. . MILP o mula ion o ob aining absolu e alues
Le be x a con inuous a iable in he ange [ − C,C]wi h C being a cons an alue. The absolu e alue o x can be ob ained imposing he ollowing se
o cons ain s:
x≤aM (45)
x≥ (a−1)M(46)
x−y≤ (1−a)M(47)
x−y≥ (a−1)M(48)
x+y≤aM (49)
x+y≤aM (50)
whe e a is a bina y a iable, M a big posi i e numbe (M≥2C) and y a posi i e con inuous a iable. Cons ain s (45) and (46) a e used o se a=1
i x is posi i e and a=0 i nega i e. Cons ain s (47) and (48) a e used o impose y=x when x is posi i e while cons ain s (49) and (50) a e used o
impose y= − x when x is nega i e. The e o e, imposing cons ain s (45)-(50) is he same ha y= |x|.
Appendix B. . MILP o mula ion o linea ize he p oduc o a bina y and a con inuous a iable
Le x be a con inuous a iable x∈ [ − C,C]wi h C being a cons an alue. Le be a a bina y a iable. The non-linea p oduc o x and a can be
linea ized eplacing i by a con inuous auxilia y a iable g≜ax i he ollowing se o cons ain s a e imposed:
g≥ − Ma (51)
g≤Ma (52)
g≤x+M(1−a)(53)
g≥x−M(1−a)(54)
whe e M is a big posi i e numbe (M≥C). Cons ain s (51) and (52) se s g=0 i a=0 while (53) and (54) imposes g=x i a=1.
Da a a ailabili y
The da a ha has been used is con iden ial.
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