可控串联补偿阻抗控制策略研究  

Impedance control strategy of thyristor controlled series capacitor

作　　者：李可军[1] 赵建国[2] 高洪霞[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]国家电网技术学院,山东济南250002

出　　处：《电力自动化设备》2009年第5期52-56,共5页Electric Power Automation Equipment

基　　金：山东省科技攻关计划项目(2008GG30001020)~~

摘　　要：提出触发角修正反馈阻抗控制策略,与常规阻抗误差反馈修正命令阻抗的方式相比,避免了每次修正后都需查表求触发角,提高了底层响应速度。可控串联补偿(TCSC)采用非线性控制方法进行阻抗闭环控制效果最佳,但所需数据量大,实现困难。设计触发角修正变结构PID阻抗控制器:在测量阻抗第1次到达或接近命令阻抗之前,积分环节参数为0,即为PD控制器;之后则投入积分环节,恢复为PID控制器。当TCSC从不同的阻抗值阶跃到同一阻抗值时,误差累加器的值接近,从而可以得到非常接近的控制效果。数字仿真和动模实验结果表明该控制策略超调小、响应速度快,并能快速消除偏差,具有良好的动态和静态性能,且结构简单,易于工程实现。An impedance control strategy based on firing-angle modification feedback is proposed, which compared with that based on impedance error modification feedback,avoids the firing-angle table search for each modification and speeds up the response of low-level control. For the best control, the close-loop impedance controller of TCSC（Thyristor Controlled Series Capacitor） should adopt the nonlinear control theory,but it needs too many data. A variable-structure PID controller based on firing-angle modification is designed. Before the measured impedance reaches or approaches the reference value for the first time,its integral parameter keeps zero,as a PD controller, after that, it changes the integral parameter and recovers the PID controller. The values of error accumulator are similar when TCSC steps from different impedances to a same impedance level to get similar control effectiveness. Simulation and experimental results show that, the proposed control strategy has less overshoot and faster response with good dynamic and static performances. Its structure is simple to be realized.

关 键 词：可控串联补偿 阻抗控制 触发角修正反馈 变结构PID控制 动模实验 

分 类 号：TM714.3[电气工程—电力系统及自动化]