周纲,黄瑞,刘谋海,李丹,胡军华,高云鹏..基于新型B-N窗和改进分区法的三相不平衡度检测[J].电测与仪表,2023,60(10):117-123. Zhou Gang,Huang Rui,Liu Mouhai,Li Dan,Hu Junhua,Gao Yunpeng.Three-phase unbalance factor detection based on new B-N window and improved partition method[J].Electrical Measurement & Instrumentation,2023,60(10):117-123.
基于新型B-N窗和改进分区法的三相不平衡度检测
Three-phase unbalance factor detection based on new B-N window and improved partition method
The national standard GB/T15543-2008 requires that the calculation of the voltage unbalance factor needs to obtain the phase sequence component based on the amplitude and phase of the fundamental wave, but its calculation method involves square root calculation and phase angle calculation, which is not conducive to the implementation of embedded systems. A new B-N mutual convolution window is established, the improved FFT correction formula which is based on the B-N mutual convolution window and the three-spectral line is derived, the phase sequence component is obtained by using the improved coordinate partition method in this paper. Three-phase unbalance factor detection based on new B-N window and improved partition method is proposed. Complex square calculation is avoided and the detection accuracy of the amplitude and phase of the fundamental wave is improved, finally the rapid and accurate detection of the three-phase unbalance factor is realized. The simulation experiment results show that the proposed algorithm can effectively achieve the accurate detection of unbalance factor under the conditions of fundamental wave, harmonic and noise interference, the implementation is simple and the accuracy is higher than the recommended method of the national standard,.
