一种降低换相失败概率的变论域模糊控制方法  

Variable Universe Fuzzy Control Method for Reducing Commutation Failure Probability

作　　者：胡松伶 王渝红[1] 刘霄涵[1] 李兴源[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《高压电器》2017年第11期57-62,共6页High Voltage Apparatus

基　　金：国家自然科学基金重点资助项目(51037003)~~

摘　　要：为了降低直流系统换相失败的几率,通过对换相机理的分析,得到促进换相的因素,利用模糊控制预防控制换相失败。针对常规模糊控制精度不高,及控制规则与精度间的矛盾,提出了一种基于相平面响应轨迹特征向量法的变论域模糊预防控制方法,从而动态改变论域,修正控制规则,提高控制精度和收敛性。该方法动态监测交流电压的变化和变化率,一旦故障快速增大越前触发角,减小换相面积,抑制换相失败的发生。通过CIGRE HVDC标准模型进行了仿真研究,仿真结果验证了所提控制方法的灵敏性和准确性,能够有效地降低换相失败发生的概率。To reduce the probability of commutation failure for DC systems,the key factors to promote the commutation process are obtained by analyzing the mechanism of commutation failure so as to prevent the commutation failure by means of fuzzy control.For improving the accuracy of fuzzy controller and balancing the number of con- trol rules and the accuracy, a variable universe fuzzy control method based on characteristic vectors of phase plane is proposed.This method can alter the universe dynamically and revise the control rules to improve control accuracy and convergence.It measures the change of voltage dynamically, increases the firing angle and decreases the commutation area to inhibit commutation failure when a fault occurs.Simulation based on the standard CIGRE HVDC model verifies the sensitivity and correctness of the proposed variable universe fuzzy control method, and indicates that this method can reduce commutation failure probability.

关 键 词：换相失败 预防控制 变论域模糊控制 特征向量 

分 类 号：TM721.1[电气工程—电力系统及自动化]