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考虑到静止同步串联补偿器(static synchronous series compensator,SSSC)输出电压相位与线路电流相位的垂直关系、逆变器的损耗以及直流侧电容电压的波动过程,在两相同步旋转d-q坐标系下建立SSSC的恒阻抗模型。在分析此模型的基础上提出SSSC的双闭环控制策略,即电容电压控制和线路阻抗控制。在电容电压控制环中,选取SSSC为控制对象,电容电压为控制目标;在阻抗控制环中,选取含SSSC的输电线路为控制对象,线路阻抗为控制目标。在Matlab/Simulink动态仿真环境中搭建SSSC的恒阻抗模型及控制系统的仿真模型,并对线路阻抗的调节过程和电容电压的变化过程进行仿真,仿真结果证明了所建立模型和所提出控制策略的有效性和实用性。
Considering the vertical relationship between the output voltage phase and the line current phase of the SSSC, the loss of the inverter and the fluctuation of the capacitor voltage on the DC side, a two-phase synchronous rotating dq coordinate system is established SSSC constant impedance model. Based on the analysis of this model, a double closed-loop control strategy of SSSC is proposed, that is, capacitor voltage control and line impedance control. In the capacitor voltage control loop, the SSSC is selected as the control object and the capacitor voltage is the control target. In the impedance control loop, the SSSC-containing transmission line is selected as the control object and the line impedance is the control target. In the Matlab / Simulink dynamic simulation environment, the SSSC constant impedance model and the control system simulation model are established, and the process of the line impedance regulation and the change of the capacitor voltage are simulated. The simulation results show that the model and the proposed control strategy Validity and practicality.