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.