Reliability Evaluation of Complex Distribution Network Based on Improved Network-Equivalent and Fault Influence Matrix

doi:10.11930/j.issn.1004-9649.2016.07.020.07

Abstract

Abstract: A new method is proposed for the reliability evaluation of complex distribution networks, which consists of multistage sub- feeders with breakers and protections installed. First, the complex distribution network is simplified into several simple node networks. The upward-equivalent node is connected to the branch switch directly in the improved network-equivalent method.The impact of the superior network on the lower network is treated as an area-node reliability index of the downward-equivalent simple node network,which is added to the reliability indexes in the subsequent computing process. The error of the traditional network-equivalent method is avoided in the improved method. Then a fast method based on the fault influence matrix is derived. The reliability indexes can be calculated using the proposed method. The effect of various switching devices on the system reliability is also taken into account during the computing process. It is not only as accurate as the FMEA method,but faster than the existing algorithms. Moreover, it is easy for programming. Test results are presented to illustrate the effectiveness of the algorithm.

Key words: power system, complex distribution networks, sub-feeders, reliability evaluation, network simplification, fault influence matrix, switch faults, automatic switch refusing to action

CLC Number:

TM712

ZHANG Jie, WANG Xiaogang, DENG Zhijie, LI Dongqi, CHEN Guokun. Reliability Evaluation of Complex Distribution Network Based on Improved Network-Equivalent and Fault Influence Matrix[J]. Electric Power, 2016, 49(7): 20-26.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.07.020.07

https://www.electricpower.com.cn/EN/Y2016/V49/I7/20

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