An Equivalent Decoupling Model for Fault Location in Complex Distribution Network with Distributed Generation

doi:10.12204/j.issn.1000-7229.2022.02.006

Abstract

Abstract:

Since distributed power supply is connected to distribution networks on a large scale, its topology and components are becoming more and more complex. As the direction of fault current at feeder switches is difficult to determine, a new matrix algorithm for equivalent decoupling fault location in complex distribution networks is proposed in this paper. In order to simplify the topology of complex distribution network effectively, the distribution network is decoupled according to the principle of depth priority to make it a network composed of tree trunks. A new fault-location matrix algorithm for complex distribution network is presented to solve the problem of large computation and complex steps in fault-location matrix algorithm for complex distribution network. Compared with traditional matrix algorithm, this method is more accurate for T-section and terminal section of power network fault location. Finally, through the typical park distribution network model and the improved IEEE 33-node system case, the method proposed in this paper can not only locate the faults in the distribution network, but also simplify the complex distribution network structure. Compared with the traveling wave method, the proposed method shortens the locating time and has better application value.

Key words: distributed generation, complex distribution network, fault location, matrix algorithm, equivalent decoupling

CLC Number:

TM771

BAI Xingzhen, SONG Zhaoshan, GE Leijiao, ZHANG Bo, ZHU Ailian, NIU Feng. An Equivalent Decoupling Model for Fault Location in Complex Distribution Network with Distributed Generation[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(2): 45-53.

Figures/Tables 13

Fig.1 Simple distribution network model with distributed power

Fig.2 Complex distribution network model

Fig.3 Equivalent decoupling results

Fig.4 Flowchart of fault-location algorithm

Fig.5 Equivalent decoupling of improved IEEE 33-node distribution network

Table 1 Fault location results of IEEE 33-node distribution network with different switching coefficients

Fig.6 Implementation of equivalent decoupling for complex distribution network

Table 2 Fault location results for complex distribution network

Table 3 Comparison of different matrix algorithms under improved IEEE 33-node system

Fig.7 IEEE 69-node distribution network model

Table 4 Comparison of different algorithms in IEEE 69-node system

Fig.8 Distribution network model with comparison algorithm

Table 5 Comparison of different algorithms

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