基于三电平电压源换流器的高压直流输电系统的控制策略研究

Study on Control Strategy of Three-Level VSC-HVDC System

分析了基于电压源换流器 (VSC)的高压直流输电系统的有功及无功控制原理 ,并以此设计出两端三电平VSC的控制器 ,控制器设计中采用了PI调节器和空间矢量PWM技术 ,并通过时域数字仿真验证了所设计控制器的优越性。

This paper discusses the fundamental principles of the active and reactive power control for three-level VSC(Voltage Source Converter)based HVDC system The three-level converter structure is employed to enhance transmission capacity of the VSC-HVDC system.With the proposed three-level VSC-HVDC system,the corresponding control strategy is presented.Based on this control strategy,appropriate controllers using PI controllers and space vector PWM(SVPWM)technique are designed to control the active and reactive power at each end station.Digital simulation is done to verify the validity of the proposed control strategy and controllers.