基于VSC的多端直流输电系统的控制策略  

Control Strategy of VSC Based Multi-terminal HVDC Transmission System

作　　者：陈海荣[1] 

机构地区：[1]金华职业技术学院,浙江省金华市321017

出　　处：《电力建设》2011年第8期58-63,共6页Electric Power Construction

摘　　要：在换流器控制器设计中,采用基于输入输出反馈线性化策略的双闭环控制器结构和直流电压前馈补偿环节,既实现有功和无功的解耦控制,又改善了换流器交流侧的输出电压和电流波形。在多端系统稳定控制中,提出了多点直流电压控制策略,它提高了多端系统的功率平衡能力和运行的可靠性与经济性。文章对1个5端的电压源型直流输电(voltage source converter based multi-terminal HVDC,VSC-MTDC)系统进行仿真验证。结果表明,VSC-MTDC系统采用所设计的控制策略具有良好的动态稳定性能,适合作为分布式发电系统与电网的接入系统。Control strategy of voltage source converter（VSC） based multi-terminal HVDC transmission system is investigated in this paper.DC voltage feed-forward compensation and controller configuration of double closed loop based on linearized feedback of input and output are applied in controller design of the converter.This approach can realize decoupled control of active and reactive power.Meanwhile,it can improve the voltage and current waveforms at AC side of the converter.Multi-point DC voltage control strategy is proposed for stability control of the multi-terminal HVDC system,which is able to improve power balance ability of the multi-terminal DC（MTDC） system and enhance reliability and economy of system operation.Simulation is performed on a VSC-MTDC system with five terminals and the results show that the proposed control strategy with good dynamic characteristics is suitable for integration of distributed generation system and power system.

关 键 词：电压源型换流器(VSC) 多端直流输电 电流解耦控制 多点直流电压控制 分布式发电 

分 类 号：TM721[电气工程—电力系统及自动化]