Fault Location for Low Voltage Active Distribution Network Based on Perturbation Method

doi:10.11930/j.issn.1004-9649.201803206

Abstract

Abstract: With the access of distributed generation to low-voltage distribution network, the power flow of the distribution network becomes more complicated. As a result, the traditional fault location scheme based on one-way power flow no longer applies. This paper proposes a perturbation based phase-mode transformation to achieve the fault location for low-voltage distribution networks with distributed generation. Against the asymmetry of three-phase line parameters in low-voltage distribution network, the line parameter impedance matrix perturbation is constructed with the perturbation theory to derive the phase mode transformation matrix which can decouple the original three-phase networks into three mutually independent sequence graphs, consequently realizing the decoupling of the parameter impedance matrix of asymmetric lines. And then, A criterion is derived for judging the fault section of the low-voltage active distribution network according to the changes of the fault component phase angle differences of the section phase-mode transformation current before and after the fault, realizing the accurate position of the low voltage distribution network. The Matlab/Simulink simulation results show that the proposed method can quickly and accurately locate the fault section and solves the influence of the asymmetry of distribution network parameters on positioning accuracy.

Key words: low-voltage distribution network, fault location, perturbation method, distributed generation

CLC Number:

TM71

ZHANG Pan, ZHANG Yu, DING Yi, LI Wuxing, JIANG Huilan, CHEN Juan. Fault Location for Low Voltage Active Distribution Network Based on Perturbation Method[J]. Electric Power, 2018, 51(12): 63-71.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201803206

https://www.electricpower.com.cn/EN/Y2018/V51/I12/63

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