用于无功静补系统的模糊-PID控制方法

A Hybrid Fuzzy and PID Control Method for Static Var Compensation

简要分析了静止型无功补偿器(SVC)的补偿原理,针对SVC系统的非线性,提出了一种用于无功静补系统的模糊-PID控制方法。该模糊-PID控制结合了模糊和PID两种控制方式的优点,根据预先设定的偏差范围在两种控制方式下自动切换。在这种混合控制方法中,采用模糊控制实现动态过程的快速调节;采用PID控制实现稳态过程的精确调节。分别将该模糊-PID控制器与传统的PID控制器应用于实验样机,对不同的负载工况进行反复实验,结果表明该控制器具有更好的控制精度,更快的动态响应速度以及更强的鲁棒性。

In order to overcome the poor adaptability of conventional PID control method which depends on precise mathematical model of the control object, control strategies combining conventional PID with other intelligent controlling algorithm for improving the performance become one hotspot recently. In this paper, a kind of control algorithm called fuzzy-PID double mode control method is designed which used into the Static Var Compensation（SVC） system. The compensating principle .is briefly analyzed in the paper. The Fuzzy-PID control synthesizes the virtue of both the fuzzy and the PID which can be switched between the two control mode according to the given error threshold. In this hybrid control method, the fuzzy control is used for quickly adjusting the dynamic process and the PID control for accurately accommodating the static process. Experimental results satisfactorily verified that the proposed control strategy has better adaptability and high robustness. It reveals preferable control precision and faster dynamic response when applied to the experimental prototype.