A Reliability Evaluation Method Based on Distribution Network Automation Engineering

Abstract

The invention discloses a power distribution network automatic engineering-based reliability evaluation method. The method mainly comprises the following steps: amending a power distribution network reliability evaluation method without adopting a power distribution network automatic technology by using improvement of downtime and splitting a power distribution network into a plurality of radial sub-networks; enumerating all fault conditions of ith sub-network to generate a fault set, and analyzing fault events in the fault set to generate a relative set and a non-relative set; calculating a reliability index of the ith radial network by using an amendment method; superposing all the reliability indexes to form a power distribution network automatic system index. According to the method for evaluating the reliability of a power distribution network automatic engineering, the downtime can be greatly shortened for power distribution network automation, and great practical significance is realized for improving the power distribution network comprehensive management level.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a reliability evaluation method based on distribution network automation engineering. Background technique [0002] As the last level of power generation, transmission and distribution, the distribution network directly faces users. The quality and reliability of power supply are of great significance to the power grid and users. With the rapid growth of power load and the continuous improvement of power supply reliability requirements, The number of various types of power distribution system equipment is increasing, and the system is becoming more and more complex, which increases the risk probability and management difficulty of the distribution network. When a fault occurs in the distribution network, there are great difficulties in the processing of the fault and the restoration of power supply. The mutual inversion and interbanding between lines and the restoration of po...

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Problems solved by technology

[0002] As the last level of power generation, transmission and distribution, the distribution network directly faces users. The quality and reliability of power supply are of great significance to the power grid and users. With the rapid growth of power load and the continuous improvement of power supply reliability requirements, The number of various types of power distribution system equipment is increasing, and the system is becoming more and more complex, which increases the risk probability and management difficulty of the distribution network

When a fault occurs in the distribution network, there are great difficulties in the processing of the fault and the restoration of power supply. The mutual inversion and interbanding between lines and the restoration of power supply generally take a long time, and the work is cumbersome. Both have brought adverse effects; in order to improve the power supply quality of the distribution network and shorten the outage time, it can be done through the automation technology of the distribution network. It ensures the reliability of the power supply through computer, automatic control, communication and other technologies. And it plays the role of shortening the power outage time, improving the power quality, optimizing the network structure and reactive power distribution. However, the urban distribution network is large in scale, complex in structure, and numerous in equipment. The construction and transformation of the distribution network requires a lot of manpower and investment. Material resources, the implementation of distribution network automation in some places does not necessarily bring economic benefits, so it is necessary to quantitatively analyze the benefits and costs of distribution network automation and evaluate the economic value of the scheme

[0003] At present, there are many studies on reliability evaluation and calculation of distribution networks in China, mainly for traditional distribution networks. There are not many studies on reliability calculations and cost-benefit quantitative analysis involving distribution network automation systems, and basically only consider Part of it is not applied to the entire large network. Distribution network automation is a trend in distribution network construction. Distribution network automation can greatly shorten the power outage time, improve the comprehensive management level of distribution network, and the economy of distribution network operation. very important practical significance

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