动态电压恢复器的形态学-dq变换综合检测算法

针对动态电压恢复器对电压跌落检测实时性的要求,提出了一种dq变换结合形态学滤波器的综合检测算法.通过选取适当的结构元素,结合形态学的基本运算,构造出低通形态滤波器.电压跌落信号经过dq变换和形态滤波器滤波以后,即可实时检测出电压跌落的起止时刻、幅值和相角偏移.仿真分析验证了该方法的正确性,结果表明该算法具有很好的动态特性,适合DVR实时检测的需要.与dq变换结合线性低通滤波检测算法相比,该算法具有实现容易、运算速度快等优点.

A NOVEL INTEGRATED MORPHOLOGY-DQ TRANSFORMATION DETECTION ALGORITHM FOR DYNAMIC VOLTAGE RESTORER

In order to meet the real time requirements for dynamic voltage restorer, a new method to detect voltage sags is presented, which integrates dq transformation with morphological filter. By using appropriate morphologic structure element and combining with proper morphologic operators, a low-pass morphological filter is formed. Voltage sag can be detected instantaneously with duration, magnitude and phase-angle jump when it come through dq transformation and morphological filtering. Simulation results prove that the proposed method is correct and it has better dynamic performance. It is able to meet the real time requirement to detect voltage sag by DVR. Compared with the integrated dq transformation-linear low-pass filter detection algorithm, this method has the advantages of easiness in implementation and high speed in execution.