静止同步补偿器的非线性控制

Nonlinear Control of Static Synchronous Compensator

静止同步补偿器(STATCOM,Static Synchronous Compensator)是一个多变量、非线性、强耦合的系统,建立精确的换流器数学模型比较困难。本文采用非线性变换和非线性系统反馈线性化理论,建立同步旋转坐标系下STATCOM的非线性数学模型,结合线性系统最优控制原理,设计STATCOM的状态反馈线性化解耦控制器,实现有功功率和无功功率的解耦控制。基于PSCAD/EMTDC的数字仿真,验证了所设计的控制器具有良好的控制性能。

Static Synchronous Compensator is a multivariable nonlinear system with strong coupling.It is quite difficult to modify the VSC by using the precise mathematical model.This paper adopts theories of the nonlinear transformation and the feedback linearization of nonlinear system,and then creates the nonlinear mathematical model of the VSC in d-q synchronous reference frame.Decoupling control strategy with state variable feedback linearization is proposed in this paper,which can control the active and reactive power separately.Simulation results realized by PSCAD/EMTDC show that the designed control system obtains better control property.