基于dq 变换与小波多分辨率分析的电力系统暂态复合扰动信号检测方法

dq坐标变换及其改进算法是检测暂态电能质量的常用方法，但在复合扰动情况下dq变换方法的检测精度会受到很大影响。针对此问题，提出了一种基于dq变换与小波多分辨率分析相结合的暂态电能质量检测方法。通过小波多分辨率分析分离出电压的低频信号成分，然后再对分离出的低频信号成分进行瞬时dq变换。同时用形态滤波分离出电磁暂态扰动，避免了各扰动检测之间的相互影响。最后利用Matlab/Simulink对所提方法和常规dq变换方法在复合扰动情况下的检测进行了仿真对比，结果表明所提方法适应能力强，具有非常优越的综合性能。

Detection of transient complex disturbance signal in power system based on dq transform and wavelet-multiresolution analysis

The dq transform is a common method to detect transient power quality, but the accuracy of the method will be greatly affected in the case of complex disturbance. For this problem, the method based on dq transform and wavelet-multiresolution analysis is put forward. Through the wavelet-multiresolution analysis, the low frequency of the signal is separated, then instantaneous dq transform is made on the isolated low frequency components. At the same time, the electromagnetic transient disturbance is separated by the morphological filter, so the interaction between different disturbances is avoided. Finally, the proposed method and the conventional dq transform method are simulated and compared with Matlab/Simulink software. The results show that the proposed method has strong anti-interference ability and excellent comprehensive performance.