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.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第12期35-40,共6页
Power System Protection and Control
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
VSC-HVDC
positive and negative component detecting
state-feedback linearization
current decoupling controller
negative voltage compensation
