SHI Xin-chun, ZHOU Guo-liang, FU Chao. DC Voltages Balancing Technology of the Multi-VSC-HVDC Parallel Operating System with DC Side in Series[J]. High voltageapparatus, 2008, (3): 200-202.
SHI Xin-chun, ZHOU Guo-liang, FU Chao. DC Voltages Balancing Technology of the Multi-VSC-HVDC Parallel Operating System with DC Side in Series[J]. High voltageapparatus, 2008, (3): 200-202.DOI:
Multi-VSC-HVDC parallel operating system with DC sides in series could be adopted to increase the transmission capacity of VSC-HVDC system
and the key problem is to balance the DC voltage. Therefore
DC voltage balancing technology of the parallel operating system was analyzed in this paper. Simulation was carried out to test its performance under some typical conditions such as self parameter disparity
power command step and AC side accident. To improve the waveform quality and decrease the switching frequency of each device
CPS-PWM was adopted for system control. The DC voltages balancing method and CPS-PWM control strategy were verified by the simulated results.