CAJ | 학술논문

短时电压变动是指由于系统中不对称、非线性负载的冲击而引起的电压骤升、电压骤降以及瞬时中断等。它会严重影响敏感信息用电设备的正常使用，是现代电能质量的主要问题之一。针对短时电压变动信号特点，设计了基于Haar小波的电能质量监测算法，并利用MATLAB对线路发生短时电压变动进行了仿真。利用Haar小波正变换不仅能分析出信号中的各频率成分，而且能够准确定位暂态信号中各频率分量出现的时间；利用Haar小波反变换重建原试验信号，表明了算法的正确性和有效性。
단시전압변동시지유우계통중불대칭、비선성부재적충격이인기적전압취승、전압취강이급순시중단등。타회엄중영향민감신식용전설비적정상사용，시현대전능질량적주요문제지일。침대단시전압변동신호특점，설계료기우Haar소파적전능질량감측산법，병이용MATLAB대선로발생단시전압변동진행료방진。이용Haar소파정변환불부능분석출신호중적각빈솔성분，이차능구준학정위잠태신호중각빈솔분량출현적시간；이용Haar소파반변환중건원시험신호，표명료산법적정학성화유효성。
Short duration voltage change includes voltage swells, voltage sags and momentary interruption, which is due to the impact of the load in asymmetry, nonlinear system. It can seriously affect the sensitive information electric equipment in normal use, and has become one of main problems of modern power quality. According to the characteristics of short duration voltage change signals, a novel power quality monitoring algorithm based on Haar wavelet is proposed, and simulation is given for line short duration voltage change in Matlab. The use of Haar wavelet transform can not only analyze the signal in each frequency component, but also can locate the time of transient signals of various frequency components exactly; the reconstruction of the original test signal by using Haar wavelet inverse transform indicates that the algorithm is correct and effective.