CAJ | 학술논문

电力系统中大量谐波的注入使得网络电能质量明显下降，而传统的检测方法由于自身技术的限制，已经不能满足目前谐波检测对实时性和精确性的要求。该文在分析了电网谐波变化特征的基础上，结合谐波检测新理论的发展及应用实践，提出将小波变换与传统检测方法相结合的检测方案，并用仿真试验验证了该联合算法的有效性。数据结果表明：小波变换在分析复杂信号中各谐波成分时表现出了其时频局部化特性的优势，而传统的FFT可准确提取信号各成分的频谱信息，该联合检测方法有效地提高了谐波检测的精度。
전력계통중대량해파적주입사득망락전능질량명현하강，이전통적검측방법유우자신기술적한제，이경불능만족목전해파검측대실시성화정학성적요구。해문재분석료전망해파변화특정적기출상，결합해파검측신이론적발전급응용실천，제출장소파변환여전통검측방법상결합적검측방안，병용방진시험험증료해연합산법적유효성。수거결과표명：소파변환재분석복잡신호중각해파성분시표현출료기시빈국부화특성적우세，이전통적FFT가준학제취신호각성분적빈보신식，해연합검측방법유효지제고료해파검측적정도。
To inject a large amount of harmonic in power system makes the network electric energy quality decreased obviously , while the traditional detection method because of its own technical limita-tions, has been unable to meet the requirements of real -time and accuracy of the harmonic detection . Based on the analysis of the characteristics of power grid harmonic changes , combined with the develop-ment and application of new harmonic detection theory , detection is presented .By combining the wavelet transform and the traditional detection method , and its effectiveness is verified by simulation test of com-bined algorithm .Results show that:the wavelet transform in the analysis of the harmonic components in complex signal showed its time -frequency localization characteristic advantage .The traditional FFT can accurately extract signal of the spectrum information .The joint detection method effectively improves the accuracy of harmonic detection .