基于负序电压补偿的VSC-HVDC系统的不平衡控制  

Unbalanced control strategy based on negative voltage compensation for VSC-HVDC system

作　　者：杨硕[1] 张卫星[1] 李德泉[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061

出　　处：《电力系统保护与控制》2012年第12期35-40,共6页Power System Protection and Control

摘　　要：交流系统故障时VSC-HVDC系统的控制策略直接关系到系统的运行和安全性能,具有明显的工程应用价值。建立了交流系统不平衡故障时d-q同步旋转坐标系下系统换流器的正负序数学模型,设计了不平衡条件下的同步相位和正负序分量的实时检测系统。采用非线性系统反馈线性化理论,设计了系统的状态反馈线性化电流解耦控制器。在此基础上设计了负序电压补偿的不平衡控制系统,在有效抑制负序电流的同时,简化了控制系统结构。基于PSIM的数字仿真,验证了所设计的控制器具有良好的控制性能。The control strategy for unbalanced VSC-HVDC system is directly related to its function and security, so it has a great importance for the engineering. The paper builds a positive and negative mathematical ＇model of VSC in d-q synchronous reference frame, and designs a detecting system of synchronous phase and positive and negative component under unbalanced condition. By using nonlinear transformation and nonlinear system feedback linearization theory, the state-feedback linearization decoupling controller for VSC-HVDC system is established. Finally, the paper designs an unbalanced control strategy based on negative voltage compensation for VSC-HVDC. Besides restraining the negative current, it also simplifies the structure of the control system. The digital simulation based on PSIM proves the designed controller has good control performance.

关 键 词：VSC—HVDC 正负序分量检测 反馈线性化 电流解耦控制器 负序电压补偿 

分 类 号：TM761.1[电气工程—电力系统及自动化]