直流侧串联的多VSC-HVDC并联运行系统直流侧电压平衡控制方法  

DC Voltages Balancing Technology of the Multi-VSC-HVDC Parallel Operating System with DC Side in Series

作　　者：石新春[1] 周国梁[1] 付超[1] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,河北保定071003

出　　处：《高压电器》2008年第3期200-202,共3页High Voltage Apparatus

基　　金：教育部博士点基金项目(20070079007)

摘　　要：为提高VSC-HVDC系统传输容量,可采用直流侧串联的多VSC-HVDC并联运行系统,但需解决其直流侧电压平衡问题。笔者对其平衡控制方法进行分析,对系统存在自身参数不一致、指令功率突变、交流外部故障情况进行仿真验证。为降低器件开关频率并提高波形质量,采用了载波移相的控制方法。仿真结果证实了所提出的直流侧串联的多VSC-HVDC并联运行系统直流侧电压平衡控制以及载波移相方法用于该系统的有效性。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.

关 键 词：VSC-HVDC 并联运行 直流侧电压平衡 载波移相 

分 类 号：TM76[电气工程—电力系统及自动化]