Study on Detection of Voltage Sag Based on Sliding Window Wavelet and Two Points Method

doi:10.11985/2017.05.010

Abstract

Abstract:

A algorithm of voltage sag detection based on sliding window wavelet and two points method was proposed for overcome the disadvantage of wavelet transform in the condition of harmonics interference. According to the proposed algorithm, the fundamental voltage signal can be obtained by using sliding window wavelet to filter harmonic component. Then, the amplitude ratio and phase jump information of voltage sag are detected by Two Points method. Simulation results show that the problem of voltage sag characteristic parameter calculation, which caused by wavelet coefficient maximum norm is hardly to identification, does not exist when the proposed algorithm is adopted. The proposed algorithm can meet the needs in engineering due to the voltage sag characteristic parameter can be detected under the condition of harmonics interference and the delay of detecting results less than one cycle.

Key words: Sliding window wavelet, two-points algorithm, voltage sag, harmonics interference

CLC Number:

TM935.22

Sunchong Zhao,Zhanfeng Ying,Xiao Ma,Jiyun Zhang,Hongfei Shi. Study on Detection of Voltage Sag Based on Sliding Window Wavelet and Two Points Method[J]. Journal of Electrical Engineering, 2017, 12(5): 64-70.

Figures/Tables 8

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序号	暂降时刻t_d/s	恢复时刻t_r/s
Case1	0.0766	0.2263
Case2	0.0781	0.2278
Case3	0.0797	0.2294
Case 4	0.0813	0.2309
Case 5	0.0825	0.2322

序号	暂降时刻t_d/s	恢复时刻t_r/s	k误差(%)	φ误差(%)
Case 1	0.0766	0.2263	0.18	0.12
Case 2	0.0781	0.2278	0.24	0.14
Case 3	0.0797	0.2294	0.16	0.23
Case 4	0.0813	0.2309	0.27	0.12
Case 5	0.0825	0.2322	0.24	0.25