A Novel Fault Feeder Selection Method for Resonant Grounding Distribution Networks Based on Improved Hough Transform

doi:10.11930/j.issn.1004-9649.202306087

Abstract

Abstract:

Aiming at the problem of inaccurate feeder selection in case of zero-crossing voltage and high impedance faults in distribution networks, a novel feeder selection method for single-phase grounding faults of resonant grounding systems is proposed. Firstly, the optimized variational mode decomposition (VMD) is used to process the zero-sequence power of each feeder, consequently selecting the mode IMF(k) with the highest correlation strength with the original zero-sequence power. And then the IMF(k) is convert into a two-dimensional image in JPG format, and the Hough transform detection technology is used to obtain the fitting line and angle of IMF(k) at the initial stage of the fault. The angle between the fitting straight lines of the modal quantities of each feeder is compared and processed, and the feeder corresponding to the minimum comprehensive correlation coefficient value is determined as the faulty feeder. The simulation results show that the proposed method is not affected by the factors such as ground resistance, fault phase angle, noise interference, and data loss, which verifies the effectiveness of the proposed method.

Key words: single-phase grounding fault, two-dimensional image, Hough transform, comprehensive correlation coefficient, fault feeder selection

Liang GUO, Xinyu QU, Xiaowei WANG, Yizhao WANG, Ying TIAN, Fan ZHANG. A Novel Fault Feeder Selection Method for Resonant Grounding Distribution Networks Based on Improved Hough Transform[J]. Electric Power, 2024, 57(7): 132-142.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202306087

https://www.electricpower.com.cn/EN/Y2024/V57/I7/132

Figures/Tables 17

References 25

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馈线类型	相序	R/(Ω·km^–1)	C/(μF·km^–1)	L/(mH·km^–1)
架空线	正序	0.170 0	0.009 7	1.210 0
架空线	零序	0.230 0	0.008 0	5.478 0
电缆	正序	0.270 0	0.339 0	0.255 0
电缆	零序	2.700 0	0.280 0	1.019 0
DG变	正序漏抗为0.025 00 p.u.		额定功率为2 MV·A

馈线类型	相序	R/(Ω·km^–1)	C/(μF·km^–1)	L/(mH·km^–1)
架空线	正序	0.170 0	0.009 7	1.210 0
架空线	零序	0.230 0	0.008 0	5.478 0
电缆	正序	0.270 0	0.339 0	0.255 0
电缆	零序	2.700 0	0.280 0	1.019 0
DG变	正序漏抗为0.025 00 p.u.		额定功率为2 MV·A

故障馈线	故障位置D/km	选线判据	最小值	结果
L₁	10	[–0.10 0.60 0.63 0.66]	–0.10	L₁
L₃	6	[0.92 0.89 0.72 0.89]	0.72	L₃
L₄	5	[0.50 0.20 0.43 –0.29]	–0.29	L₄

故障馈线	故障位置D/km	选线判据	最小值	结果
L₁	10	[–0.10 0.60 0.63 0.66]	–0.10	L₁
L₃	6	[0.92 0.89 0.72 0.89]	0.72	L₃
L₄	5	[0.50 0.20 0.43 –0.29]	–0.29	L₄

故障馈线	故障位置 D/km	初相角β/(°)	SNR/ dB	R_g/Ω	故障发生时间点 t/s	选线判据	最小值	结果
L₁	10	90	—	10	0.1	[0.89 0.96 0.96 0.97]	0.89	L₁
				500		[0.22 0.75 0.74 0.74]	0.22	L₁
				1000		[–0.02 0.66 0.66 0.66]	–0.02	L₁
L₃	6	0	—	10	0.1	[0.49 0.38 –0.48 0.35]	–0.48	L₃
		0	—	500	0.1	[0.34 0.34 –0.98 0.34]	–0.98	L₃
		90	—	10	0.1	[0.90 0.87 0.71 0.81]	0.71	L₃
		90	—	500	0.1	[0.47 0.60 0.09 0.93]	0.09	L₃
		60	10	10	0.1	[0.90 0.86 0.65 0.87]	0.65	L₃
				1000		[0.53 0.62 –0.20 0.44]	–0.20	L₃
				2000		[0.39 0.43 –0.60 0.49]	–0.60	L₃
L₄	5	60	—	10	电压过零点	[0.38 0.38 0.39 –0.84]	–0.84	L₄
				1000		[0.83 0.83 0.83 0.49]	0.49	L₄
				2000		[0.88 0.87 0.88 0.62]	0.62	L₄