CAJ | 학술논문

电力系统中引入各种非线性设备，使电网谐波越来越复杂，其中包含大量稳态部分和各种暂态突变部分。目前，比较经典的谐波检测方法就是快速傅里叶变换（FFT），它能快速且准确地计算出稳态谐波，但是对于非稳态谐波信号就无能为力了。小波分析（DWT）能有效地检测非稳态谐波信号，基于二者的优势提出了一种将FFT与DWT综合的谐波分析方法。通过在MATLAB上仿真表明这种方法既能准确检测非稳态信号，也能快速准确的计算稳态谐波的参数。
전력계통중인입각충비선성설비，사전망해파월래월복잡，기중포함대량은태부분화각충잠태돌변부분。목전，비교경전적해파검측방법취시쾌속부리협변환（FFT），타능쾌속차준학지계산출은태해파，단시대우비은태해파신호취무능위력료。소파분석（DWT）능유효지검측비은태해파신호，기우이자적우세제출료일충장FFT여DWT종합적해파분석방법。통과재MATLAB상방진표명저충방법기능준학검측비은태신호，야능쾌속준학적계산은태해파적삼수。
To introduce so many nonlinear devices in the power system, power grid harmonic is more and more complex, which contains a large number of steady parts and all kinds of transient mutation. At present, the classic harmonic detection method is the fast Fourier transform, which can quickly and accurately calculate the steady state harmonic. But it is powerless when it analyzes transient harmonic signal. Wavelet analysis can detect transient harmonic signal effectively. Based on the advantages of both FFT and DWT, one analyzing strategy of power system harmonics is presented . Through the simulation in MATLAB show that this method can accurately detect unsteady signal, also can quickly accurately calculates the parameters of steady-state harmonic.