基于本地信号的VSC-MTDC输电系统控制策略  

A Control Strategy Based on Local Signal Measuring for VSC-MTDC

作　　者：丁涛[1] 张承学[1] 孙元博[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电力系统自动化》2010年第9期44-48,86,共6页Automation of Electric Power Systems

摘　　要：针对基于电压源型换流器的多端直流(VSC-MTDC)输电系统现有控制策略存在的问题,设计了基于本地信号的参与功率平衡的各端协调控制策略。其中,主导站采用定电压控制,主辅助站采用基于本地电压信号的带电压下降特性的控制(LVBC)方式,次辅助站采用LVBC与定电流控制相结合的混合控制方式。主导站正常运行时,次辅助站为定电流控制;主导站因故障退出运行使次辅助站直流端电压满足控制转换的要求时,次辅助站自动转换到LVBC,参与承担平衡功率从而稳定直流系统电压的任务;当原有造成功率不平衡的因素去除后,次辅助站能自动恢复到定电流控制。在PSCAD/EMTDC平台上建立仿真系统,结果证明了该控制策略是正确、有效的。For resolving the present problems of VSC-MTDC,a coordinated control strategy for converters to take part in balancing power based on local signals is designed. For the strategy,master station （MS） adopts constant DC voltage control,main assistant station adopts local-DC-voltage-based-changing-current control （LVBC）,and subsidiary assistant station （SAS） combines LVBC and constant DC current control （CDCC）. SAS is with CDCC when MS is in normal operation. When MS is out of operation and DC voltage of SAS satisfies the demand for control conversion,SAS automatically switch over to LVBC to participate in balancing power and to stabilize DC voltage. And it returns to CDCC automatically when the cause to unbalance power is removed. The simulation results on PSCAD/EMTDC platform show that the control strategy is correct and effective.

关 键 词：电压源型换流器(VSC) 多端直流(MTDC)输电 控制策略 定电压控制 交流电压控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]