基于状态反馈精确线性化变结构控制的SSSC控制器设计

Design of SSSC Controller Based on Exact Linearization Via Feedback and Variable-structure

提出一种基于状态反馈精确线性化变结构控制的静止同步串联补偿器(SSSC)控制器设计方法。考虑到SSSC交流侧电压幅值和相角以及直流侧电容电压的动态调节过程,建立了SSSC在同步旋转dq坐标系下的非线性数学模型,在此模型的基础上,采用状态反馈精确线性化方法将原非线性系统转化为线性系统。然后,应用变结构控制原理设计SSSC控制器,同时通过PI控制稳定直流侧电容电压。最后,利用MATLAB仿真软件搭建了装设有SSSC的110kV输电系统的仿真模型,仿真结果表明了所设计的控制器能够很好地根据需求来改善电网输电能力,具有良好的暂态控制性能。

To improve the power grid transmission capacity with the static synchronous serier compensator （SSSC）, a design method of SSSC controller based on exact lineariza- tion via feedback and variable structure control is proposed. By considering of the dynamic regulating process of the volt- age magnitude and angle in the ac side of SSSC and the dy- namic variable characteristics of the capacitance voltage in the dc side of SSSC, a nonlinear mathematical model of SSSC in synchronously rotating dq frame of coordinate sys- tem is built, based on which state feedback based exact lin- earization method is presented to convert the nonlinear mathematical model into the linear one. Then, the control- ler of SSSC is designed by using variable structure control theory, and DC capacity voltage is stabilized by PI control. In the end, the model of ll0kV transmission system with SSSC is built by MATLAB for simulation and analysis. The simulation results show that the designed controllers can im- prove the power grid transmission capacity according to de- mand, which has good transient control performance.