利用复值小波变换检测轻微的电力系统扰动  

DETECTION OF MINUTE DISTURBANCE BY COMPLEX WAVELET TRANSFORM

作　　者：薛蕙[1] 杨仁刚[1] 郭永芳 

机构地区：[1]中国农业大学信电学院,北京100083 [2]山东泰安热电厂,山东省泰安市271000

出　　处：《电网技术》2004年第17期24-27,共4页Power System Technology

摘　　要：在分析利用复值小波变换系数的相位信息分析信号突变的方法的基础上,针对利用小波变换算法得到的相位图不连续的问题,提出了改进相位图。改进相位图克服了原相位图中相位波形不连续的问题,且能更清楚地观察到波形畸变时相位的变化。仿真分析表明,利用改进相位图可以实现电力系统轻微扰动的检测。此方法为及时发现和检测电力系统中的故障提供了良好的手段。A method in which the phase information of complex wavelet transform coefficients is applied to analyze the signal mutation is analyzed. For the discontinuity of the phase diagram obtained by wavelet transform algorithm an improved phase diagram in which the waveform of the phase is continuous is put forward, therefore, when the distortion of waveform happens the change of the phase can be more clearly observed. The results of simulation analysis show that the detection of minute disturbance in power system can be well implemented by use of the improved phase diagram, thus, as a method the improved phase diagram the minute disturbance can be used to discover and detect the minute disturbance in power system.

关 键 词：电力系统 复值小波变换 信息分析 信号扰动 

分 类 号：TM711[电气工程—电力系统及自动化]