Failure propagation method for evaluating reliability of distribution network

Abstract

The invention provides a failure propagation method for evaluating the reliability of a distribution network, and relates to a method for evaluating the reliability of a medium voltage distribution network which runs radially. The method uses a computer to perform the enumeration calculation on a failure event of each element in the distribution network by a state enumeration method through a program, and performs the power flow calculation of the distribution network and the reliability index calculation of the distribution network for output. In the method, a reliability index of the distribution network can be formed at one time, the reliability of distribution networks with a simple structure and a complex structure with a subfeeder can be calculated, the influence of a breaker, branchline protection, an isolation switch, a standby power supply, a standby transformer and the like in the distribution network is taken into consideration, and a model has good commonality, high calculation speed and strong engineering practicability, and is easy to popularize and apply. The method can be widely applied to the reliability evaluation of the distribution network, and is particularlysuitable for the reliability evaluation of the distribution network between 3 and 20kV.

Description

technical field [0001] The invention belongs to the technical field of reliability evaluation methods for medium-voltage distribution networks, and in particular relates to a reliability evaluation method for radially operating medium-voltage distribution networks. Background technique [0002] The distribution network is an important link in the power system that directly supplies power to users, and it has the most direct impact on the quality and reliability of power supply for users. According to statistics, about 80% of power outages are caused by distribution network failures. Reliability assessment of distribution networks is an important means to ensure power quality and realize the modernization of the power industry. Modernization of power industry management plays an important role. With the continuous expansion of the scale of my country's distribution network, higher requirements are put forward for the rapidity and efficiency of distribution network reliabilit...

AI Technical Summary

Problems solved by technology

However, it has the following disadvantages: when there are many sub-feeder series in the system, multiple continuous equivalents are required, that is, the system needs to be continuously "merged"; when evaluating the reliability of the equivalent system, only equivalent The reliability of the load and the system, if you want to get the reliability index of each load point, you need to start from the equivalent load, and then use the failure mode consequence analysis method to get it, that is, to get the index of each load point needs to be equivalent Payload point multiple "decomposition"

When there are many sub-feeders cascaded in the system, the process of "merging" and "decomposing" is very complicated

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