基于数学形态学复合滤波和无时延d-q变换的电压暂态扰动识别

Recognition of transient voltage disturbances based on integrated mathematics morphology filters and non-delay d-q transform

暂态电压扰动的识别是当前电能质量领域研究的热点,采用了无时延d-q变换进行暂态电压扰动识别,从而解决了延时60°构造对称三相电压的d-q变换的镜像扰动问题,针对无时延d-q变换易受谐波及高频噪声干扰的缺点,研究了数学形态学结合离散积分的滤波方案,用以取代传统的数字低通滤波器。在LabVIEW中的将该方案与传统数字低通滤波器进行对比,结果表明该滤波方案响应速度快,适应能力强,检测精度高,具有非常优越的综合性能。

Recognition of transient voltage disturbances is one of the focuses of power quality study. This paper proposes a method based on the improved non-delay d-q transform which eliminates the 60 °minor disturbance. Because the non-delay transform is easy to be interfered by harmonics and noises, a new filter combining with Mathematical Morphology and Discrete Integral is established, in order to replace the traditional digital filters. Labview is used to do the comparison with traditional digital filters, and simulation results indicates that this method has excellent comprehensive performance such as strong anti-interference ability, faster dynamic response speed and higher precision.