Power supply reliability assessment method of power distribution network comprising distributed power supply

Abstract

The invention provides a power supply reliability assessment method of a power distribution network comprising a distributed power supply. Factors of the circumstance that the distributed power supply is connected to the power distribution network, randomness of output power of the distributed power supply, capacity limitation of a link circuit, randomness of load requirements, the correlation among random variables and the like are considered, and on the basis that output power of distributed voltages and randomness of loads are considered, island segmenting is conducted on the power distribution network. The power supply reliability assessment method accords with engineering practice better, and a reliability assessment result is more objective and effective.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for evaluating power supply reliability of a distributed power distribution network. Background technique [0002] The distribution network is at the end of the power system and is an important link that directly affects the reliability and quality of power supply for users. Its power flow flows from high-voltage substations to users in one direction. In practical engineering, the distribution network in a certain area is usually divided into multiple non-overlapping power supply areas powered by a single substation, and the reliability of the power supply of the distribution network is ensured through mutual support between substations. However, this centralized power supply method may still cause serious power outages when the upper-level power grid fails or catastrophes. On the other hand, as energy conservation, emission reduction, and energy efficiency impr...

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Problems solved by technology

Among the former, the representative network equivalent method, feeder partition method, shortest path method and network accessibility analysis method all implicitly assume constant load power and infinite power supply capacity, making it difficult to take into account DG output and uncertain load power. The latter is based on the Monte Carlo simulation method to obtain the probability distribution of the reliability index by sampling technology for the random variables involved in the reliability evaluation, which is slow, time-consuming, and poor in convergence performance.

In response to the above problems, domestic and foreign scholars have also conducted in-depth research on the fluctuation of distributed power output, and proposed a distribution network reliability evaluation algorithm that considers the randomness of DG energy, but still fails to take into account the output power of multiple DGs, and Correlation between DG output power and load

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