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首先在dq坐标系下分析了静止同步串联补偿器(SSSC)对于系统潮流的影响,给出了SSSC输出电压d轴与q轴分量的不同功能。分析了SSSC对于潮流控制的特点,进而针对SSSC的恒功率控制方法进行了研究。状态反馈精确线性化方法的引入实现了SSSC输出电压d轴与q轴分量之间的解耦控制。通过2个PI环节的应用,使得d轴与q轴电压分量能分别跟踪直流电容电压与线路潮流,并改善由于状态精确反馈线性化方法的引入所带来的对于系统模型不精确以及参数不确定所引起的弱鲁棒性。数字仿真结果证实了所提出的恒功率控制方法的有效性。
Firstly, the effect of SSSC on the system power flow is analyzed in the dq coordinate system. The different functions of the d-axis and q-axis components of SSSC output voltage are given. The characteristics of SSSC for power flow control are analyzed, and then the constant power control method of SSSC is studied. The introduction of the state-feedback accurate linearization method achieves decoupling control of the d-axis and q-axis components of the SSSC output voltage. Through the application of two PI links, the d-axis and q-axis voltage components can respectively track the DC capacitor voltage and the line current, and improve the inaccuracy of the system model and the uncertainty of parameters due to the introduction of the state accurate feedback linearization method Caused by the weak robustness. The numerical simulation results confirm the validity of the proposed constant power control method.