New configuration of traction converter with medium-frequency transformer: primary part

92 Ad ances in Elec ical and Elec onic Enginee ing NEW CONFIGURATION OF TRACTION CONVERTER WITH MEDIUM-FREQUENCY TRANSFORMER: PRIMARY PART V. Blahník, Z. Pe ou ka, J. Molná , J. Michalík Depa men o Elec omechanical Enginee ing and Powe Elec onics, Facul y o Elec ical Enginee ing, Uni e si y o Wes Bohemia, Uni e zi ní 26, 30614 Plze, Czech Republic, el.: +420377634406, mail: lucke@ke .zcu.cz, pe ou [email protected] g, jmolna @ke .zcu.cz, jmichali@ke .zcu.cz Summa y This pape deals wi h new con igu a ion o he ac ion con e e wi h medium- equency ans o me in ended o ac olley wi e ed locomo i es. I is conce ned o he p ima y se ially connec ed single-phase ol age-sou ce ac i e ec i ie s, which a e di ec ly connec ed o he olley wi e. This con ibu ion p esen s he p oposed con ol o he p ima y ac i e ec i ie s, simula ion and expe imen al esul s o designed low- ol age labo a o y p o o ype o con e e o a ed powe o 12kW. 1. INTRODUCTION This p ojec has been made in coope a ion wi h ou indus ial pa ne Škoda Plze company. The objec i e o his p ojec has been he esea ch in o he p ospec i e con igu a ions o he ac olley wi e ed ac ion con e e o he new gene a ion o he locomo i es and especially subu ban uni s. The p esen ed con e e con igu a ion wi h medium- equency ans o me is one o selec ed p omising solu ions. The explo ed con e e consis s o indi ec equency con e e s a i s inpu . The inpu pa s o he indi ec con e e s a e composed o ol age sou ce ac i e ec i ie s, which a e di ec ly connec ed o he ac olley wi e. The e o e, hey a e connec ed in se ies – see Fig. 1. The medium- equency ans o me is ed by ol age sou ce in e e s ope a ed in he six-s ep mode wi h he ou pu equency o 400 Hz. The ol age-sou ce ac i e ec i ie (VSAR) a he seconda y side o he medium- equency ans o me is ed by squa e wa e ol age wi h equency o 400 Hz and he con ol o his pa was p esen in [1]. In he li e a u e, he e a e published e y in e es ing pape s dealing wi h his new con igu a ion o he ac ion con e e o locomo i es – e.g. [2] – [6]. This pape desc ibes p oposed con ol o he p ima y ac i e ec i ie s, p esen s simula ion esul s as well as expe imen al e idence o designed labo a o y p o o ype o loco con e e o a ed powe o 12kW. 2. PROPOSED CONTROL STRATEGY OF PRIMARY SINGLE-PHASE VOLTAGE SOURCE ACTIVE RECTIFIERS The p oposed con ol s a egy o he p ima y ol age-sou ce ac i e ec i ie s is shown in he Fig. 2. We con ol he o al dc-link ol age U cw (i means he sum o dc-link ol ages om all ec i ie s). The dc-link ol age con olle (sol ed as con en ional PS con olle ) commands he angle ε be ween he olley wi e ol age and ol age a he ec i ie ac side e minals (u ). The magni ude o u is calcula ed om he in o ma ion abou he olley wi e ol age magni ude (U m ) and commanded angle ε. Thus, we employ he con en ional model-based con ol o inpu ec i ie s. The PWM wi h shi ed ca ie s is used o he con ol o p ima y ol age- sou ce ac i e ec i ie s. 3. SIMULATION AND EXPERIMENTAL RESULTS OF DESIGNED LABORATORY PROTOTYPE OF PRIMARY SINGLE- PHASE VOLTAGE SOURCE ACTIVE RECTIFIERS The p oposed con e e con ol has been implemen ed in ixed-poin DSP Texas Ins umen s TMS320LF2812. The designed con e e p o o ype has a ed powe o 12kW. The p o o ype consis s o wo con e e cells a he p ima y side (in he labo a o y, we employ he ans o me wi h wo p ima y windings). Fig. 3 – Fig. 8 p esen simula ion and expe imen al esul s o he p ima y ol age- sou ce ac i e ec i ie s in ec i ie mode and in in e e mode espec i ely unde s eady-s a e condi ions. The con e e beha iou unde ansien condi ions is documen ed in Fig. 9 – Fig. 12. The p oposed model-based con ol wi h PWM is simple and ensu es e y good con e e beha iou unde s eady-s a e condi ions as well as sa is ac o y dynamic p ope ies. PWM is eligible om he iewpoin o low- equency EMC dis u bances – e.g. p oblems wi h ailway signaling. The ope a ed shi ed ca ie s p o ide mul i-le el ol age on he con e e ac e minals (in his case, he con e e is i e-le el – see Fig. 7 and Fig. 8). The mul ile el na u e o he con e e b ings posi i e impac on design o inpu induc o L s . The disad an age o p esen ed con ol is he p oblem wi h e icien olley cu en limi a ion, because olley cu en is in his case con olled indi ec ly. The designed labo a o y p o o ype o ac ion con e e has been success ully es ed in he whole powe ange. We ha e p epa ed in coope a ion wi h ou indus ial pa ne Škoda Elec ic, a.s. a 100kW p o o ype, which is nowadays unde he es s. New con igu a ion o ac ion con e e … 93 Fig. 1. Con igu a ion o designed low- ol age labo a o y p o o ype o ac ion con e e wi h medium- equency ans o me Fig. 2. P oposed con ol o p ima y ol age-sou ce ac i e ec i ie s Fig. 3. Beha iou o p ima y ol age-sou ce ac i e ec i ie s unde s eady-s a e condi ions in ec i ie mode (load … P = 10 kW) Fig. 4. S eady-s a e – ec i ie mode (load … P = 6.5kW): ch1: Vol age Uc1, ch2: T olley ol age U , ch3: T olley cu en I (10mV/A) 94 Ad ances in Elec ical and Elec onic Enginee ing Fig. 5. Beha iou o p ima y ol age-sou ce ac i e ec i ie s unde s eady-s a e condi ions in in e e mode (load … P = -10 kW) Fig. 6. S eady-s a e – in e e mode (load … P = -5.6 kW): ch1: DC-link ol age Uc1, ch2: T olley ol age U , ch3: T olley cu en I (10mV/A) Fig. 7 Beha iou o p ima y ol age-sou ce ac i e ec i ie s unde s eady-s a e condi ions in ec i ie mode (load … P = 9.3 kW) Fig. 8 S eady-s a e – ec i ie mode (load … P = 9.3kW): Ch1: T olley ol age U , Ch2: Sum o ol ages a con e e s ac e minals u , Ch3: T olley cu en i (10mV/A) Fig. 9. T ansi ion om in e e o ec i ie mode: S ep change o he load … P = - 7.2 kW → 8.8 kW Fig. 10. T ansi ion om in e e o ec i ie mode: S ep change o he load … P = - 7.2 kW → 8.8 kW Ch1: T olley ol age U , Ch2: DC-link ol age Uc1, Ch3: T olley cu en i (10mV/A) New con igu a ion o ac ion con e e … 95 Fig. 11. T ansi ion om ec i ie o in e e mode: Change o he load … P = 7 kW → -5.4 kW Fig. 12. T ansi ion om ec i ie o in e e mode: Change o he load … P = 7 kW → -5.4 kW Ch1: T olley ol age U , Ch2: DC-link ol age Uc1, Ch3: T olley cu en i (10mV/A) 4. CONCLUSIONS The p esen ed con igu a ion o he ac ion con e e wi h medium- equency ans o me is one o he p omising solu ions o he new gene a ion o he locomo i es and especially subu ban uni s. This con ibu ion gi es he main emphasis on he con ol o he p ima y ol age sou ce ac i e ec i ie s, which a e di ec ly connec ed o he ac olley wi e. This pape desc ibes p oposed model-based con ol o p ima y ec i ie s, simula ion esul s unde bo h s eady-s a e and ansien condi ions and expe imen al e idence o designed low- ol age labo a o y p o o ype o he locomo i e con e e wi h a ed powe o 12kW. The employed PWM uses shi ed ca ie s, hus, he con e e p o ides mul i-le el ol age on i s inpu e minals. The ope a ed con ol as well as PWM a e simple o implemen a ion and su icien ly obus . The designed labo a o y p o o ype o ac ion con e e has been success ully es ed in he whole powe ange. We ha e p epa ed in coope a ion wi h ou indus ial pa ne Škoda Elec ic, a.s. a 100kW p o o ype, which is nowadays unde he es s. Acknowledgmen This esea ch has been suppo ed by he Minis y o Indus y and T ade o he Czech Republic unde he p ojec FT-TA2/035. This p ojec is ealized in coope a ion wi h Škoda Elec ic, a.s., Plze, Czech Republic (www.skoda.cz). REFERENCES [1] PEROUTKA, Z., VONDRÁŠEK, F., MOLNÁR, J.:T ac ion Con e e wi h Medium-F equency T ans o me : P oposed Con e e Con ol. Resea ch epo no. 22160- 22-07. Uni e si y o Wes Bohemia in Pilsen, Plze, 2007. (in Czech) [2] VICTOR, M.: Ene gieumwandlung au AC – T ieb ah zeugen mi Mi el equenz ans- o ma o . Fah zeug echnik eb 103 (2005) He 11, s . 505 - 510. [3] STEINER, M., REINOLD, H.: Medium F equency Topology in Railway Applica ions. In: EPE 2007. Aalbo g, Denma k. [4] KJELLQVIST, T.; NORRGA, S.; ÖSTLUND, S.: Design conside a ions o a Medium F equency T ans o me in a Line Side Powe Con e sion Sys em. Annual IEEE Powe Elec onics Specialis s Con e ence 2004. Aachen, pp. 704-710. [5] CARPITA, M.; PELLERIN, M.; HERMINJARD, J.: Medium F equency T ans o me o T ac ion Applica ions making use o Mul ile el Con e e : Small Scale P o o ype Tes Resul s. SPEEDAM2006, Tao mina, pp. S2-17 – S2-22. [6] RUFER, A.; SCHIBLI, N.; CHABERT, C.; ZIMMERMANN, C.: Con igu able on -end con e e s o mul icu en locomo i es ope a ed on 16 2/3 Hz AC and 3 kV DC sys ems. In: Powe Elec onics, IEEE T ansac ionss on Volume 18, Issue 5, Sep . 2003 Pages: 1186 – 1193, 10.1109/TPEL.2003.816191.