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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。
A SSSC controller design method based on state feedback precise linear variable structure control is proposed. Considering the dynamic regulation of SSSC AC voltage amplitude and phase angle and DC capacitor voltage, a nonlinear mathematical model of SSSC in synchronous rotating dq coordinate system is established. Based on this model, the state feedback precise linearization The method transforms the original nonlinear system into a linear system. Then, the SSSC controller is designed by using the principle of variable structure control, and at the same time, the DC link capacitor voltage is stabilized by PI. Finally, a simulation model of a 110kV transmission system equipped with SSSC is built using MATLAB simulation software. The simulation results show that the designed controller can effectively improve the transmission capacity of the power grid according to the demand and has good transient control performance.