TY - JOUR
T1 - Dual Converter Fed Open-End Transformer Topology with Parallel Converters and Integrated Magnetics
AU - Gohil, Ghanshyamsinh Vijaysinh
AU - Bede, Lorand
AU - Teodorescu, Remus
AU - Kerekes, Tamas
AU - Blaabjerg, Frede
PY - 2016/8
Y1 - 2016/8
N2 - A converter system for high power applications, connected to a medium-voltage network using a stepup transformer, is presented in this paper. The converterside winding of the transformer is configured as an openend and both the ends of the windings are fed from two different converter groups. Each converter group comprises of two parallel Voltage Source Converters (VSCs), whose carrier signals are interleaved to improve the harmonic quality of the resultant switched output voltage of that converter group. However, an additional inductive component is required to suppress the circulating current that flows between the parallel interleaved VSCs. An integrated inductor is proposed which suppresses the circulating current in both the converter groups. In addition, the functionality of the line filter inductor is also integrated. Flux in various parts of the integrated inductor is analyzed and a design procedure is also described. The volume and the losses of the proposed solution are compared with that of the state-of-art solution. The control of the proposed converter system is also discussed. The analysis has been verified by the simulation and experimental results.
AB - A converter system for high power applications, connected to a medium-voltage network using a stepup transformer, is presented in this paper. The converterside winding of the transformer is configured as an openend and both the ends of the windings are fed from two different converter groups. Each converter group comprises of two parallel Voltage Source Converters (VSCs), whose carrier signals are interleaved to improve the harmonic quality of the resultant switched output voltage of that converter group. However, an additional inductive component is required to suppress the circulating current that flows between the parallel interleaved VSCs. An integrated inductor is proposed which suppresses the circulating current in both the converter groups. In addition, the functionality of the line filter inductor is also integrated. Flux in various parts of the integrated inductor is analyzed and a design procedure is also described. The volume and the losses of the proposed solution are compared with that of the state-of-art solution. The control of the proposed converter system is also discussed. The analysis has been verified by the simulation and experimental results.
KW - Voltage source converters (VSC)
KW - Parallel
KW - Interleaving
KW - Dual converter
KW - Open-end transformer
KW - Wind power
KW - Integrated inductor
KW - Magnetic integration
KW - Wind energy conversion system
KW - Parallel inverters
KW - wind turbine
KW - wind energy systems
KW - harmonic filter design
KW - harmonic filter
KW - LCL filter
KW - Parallel interleaved inverters
KW - Parallel interleaved converters
KW - High power converters
KW - Phase-shifted carrier-based pulsewidth modulation (PSC-PWM)
KW - Circulating current
KW - Circulating current suppression
KW - Inter phase transformer
KW - Circulating current control
KW - Inter cell transformer
U2 - 10.1109/TIE.2016.2548999
DO - 10.1109/TIE.2016.2548999
M3 - Journal article
SN - 0278-0046
VL - 63
SP - 4929
EP - 4941
JO - I E E E Transactions on Industrial Electronics
JF - I E E E Transactions on Industrial Electronics
IS - 8
ER -