CAJ | 학술논문

针对S变换受噪声影响较大的缺陷，提出了基于改进S变换的微网谐波检测方法。对谐波信号进行改进S变换，根据变换所得的复数时频矩阵提取特征量，进一步检测谐波的频次、幅值和相位，实现稳态谐波的检测和暂态谐波的时间定位。仿真结果表明，该谐波检测方法精确度高且抗噪性强，为微网的谐波检测提供了一种有效方法。
침대S변환수조성영향교대적결함，제출료기우개진S변환적미망해파검측방법。대해파신호진행개진S변환，근거변환소득적복수시빈구진제취특정량，진일보검측해파적빈차、폭치화상위，실현은태해파적검측화잠태해파적시간정위。방진결과표명，해해파검측방법정학도고차항조성강，위미망적해파검측제공료일충유효방법。
Aiming at the defect that the noises impacted on the S-transform greatly, this paper presented a harmonic detection method for micro-grid based on the modified S-transform, to carry out S-transform for the harmonic signals. The feature vectors were extracted from the complex number time-frequency matrix of S-transform, detecting the frequency, amplitude and phase of the harmonics further, to realize the steady state harmonic detection and the transient state harmonic time positioning. Simulation results show that the proposed approach can detect the harmonic in micro-grid with high accuracy and strong noise immunity, which provides an effective means for harmonic detection in micro-grid.