基于模块化多电平变流器的STATCOM研究

摘要

The control strategy of MMC (Modularized Multilevel Converter)-based STATCOM (STATic synchronous COMpensator) is studied. The operating characteristics of MMC are analyzed and the equivalent mathematical model of STATCOM is derived. The exact feedback linearization is adopted to decouple the control of active power and reactive power and the sliding mode control law is applied to the degraded linear system. The numerical simulation proves the rationality and feasibility of the derived equivalent model. The active power and reactive power are independently adjusted with good dynamic response.%研究了基于模块化多电平变流器(MMC)的大容量STATCOM的控制策略,对MMC运行特性进行分析,并对基于MMC结构的STATCOM进行模型等效,并推导出其数学模型.针对其强耦合、非线性特点,通过反馈线性化方法实现功率解耦,对降阶后的线性系统设计滑模控制律,并进行数值仿真和结果分析.仿真结果证明了系统等效模型的合理性和可行性,同时系统有功和无功功率独立调节,动态响应良好.