CAJ | 학술논문

针对谐波电流带来的电网损耗问题，提出了利用小波变换和FFT进行谐波电流检测及电网损耗分析的综合监测方法。基于小波变换的多分辨率分析方法，对电网电流谐波进行了检测，并将基波信号和谐波信号分离，利用傅里叶变换方法，得到低频部分中稳态谐波的频谱信息；根据各谐波分量的幅值，计算电网电流畸变率、功率因数以及造成的线路功率损耗，实现对谐波电流的监测。结果表明，随着低频谐波电流幅值的减小，电流畸变以及造成的功率损耗将会明显降低；随着电流谐波成分的增加，将会导致电网功率损耗增加。该研究为电力系统电能质量监测以及谐波治理提供了理论基础。
침대해파전류대래적전망손모문제，제출료이용소파변환화FFT진행해파전류검측급전망손모분석적종합감측방법。기우소파변환적다분변솔분석방법，대전망전류해파진행료검측，병장기파신호화해파신호분리，이용부리협변환방법，득도저빈부분중은태해파적빈보신식；근거각해파분량적폭치，계산전망전류기변솔、공솔인수이급조성적선로공솔손모，실현대해파전류적감측。결과표명，수착저빈해파전류폭치적감소，전류기변이급조성적공솔손모장회명현강저；수착전류해파성분적증가，장회도치전망공솔손모증가。해연구위전력계통전능질량감측이급해파치리제공료이론기출。
In view of the power loss problems caused by harmonic current, a comprehensive monitoring method of combining Fourier transform and wavelet transform is proposed to detect the harmonic current and analyze the power loss. The power system harmonic current is detected by the way of the wavelet multi-resolution analysis method;and the fundamental current is separated from the total harmonic current. The spectrum of low frequency harmonics in the steady-stage is obtained by Fourier transform analysis. The current distortion rate, power factor and line loss are calculated according to the amplitude of each harmonic to realize monitoring of harmonic current. The simulation results show current distortion rate and line loss will decrease with the decrease of low frequency harmonics amplitude; the line loss will increase with the increase of harmonic current content. The research results can provide a theoretical foundation for power quality monitoring and harmonic management in power system.