用于TCSC阻抗控制的积分投切式PID控制方法

INTEGRATION-SWITCHED PID CONTROL METHOD FOR IMPEDANCE CONTROL OF TCSC

可控串补(TCSC)的阻抗控制是整个串补装置成功与否的关键。文中分析了常规比例积分微分(PID)控制在命令阻抗从不同阻抗阶跃到同一阻抗时鲁棒性不好的原因,得出了常规PID控制的效果主要与接到阻抗阶跃命令后命令阻抗和测量阻抗所包围的第一块面积有关的结论,并据此提出了一种实用的积分投切式 PID阻抗控制方法。该方法在接到阻抗阶跃命令后切除积分环节,而在测量阻抗第一次超越命令阻抗时才投入积分环节。与常规PID控制的仿真结果比较表明,该方法在响应各种阻抗阶跃命令时具有较强的鲁棒性、良好的动态和静态性能,能满足工程要求。

Whether the performance of TCSC device can be implemented or not depends on its impedance control. The reason of the phenomenon is thoroughly analyzed that the robustness of traditional PID control is bad when different impedance levels are ordered to step to a same level by traditional PID control and the conclusion is obtained that the results of traditional PID control are principally decided by the first integration area which is enclosed by the ordering impedance and measured impedance after the order of impedance step is received. On this basis a practical integration- switched PID approach to control the impedance of TCSC is put forward by which the integrating element is switched off while the impedance step order is received, and the integrating element is switched on when the measured impedance excesses the specified impedance. The comparison of the simulation result from the proposed approach with that from the traditional PID control shows that the proposed approach possesses stronger robustness and good dynamic and static performances, so it is available.