Reliability determination method for power distribution network with distributed wind power based on analytical method

Abstract

The invention provides a reliability determination method for a power distribution network with distributed wind power based on an analytical method. The method comprises the following steps: step I, building a distributed power reliability model; step II, building a wind power output model; step III, building a state transition probability model of a wind turbine generator; step IV, determining the time of every operating state in an output model of the wind turbine generator to obtain the transition probability between the states of the wind turbine generator; step V, determining the fault rate of the wind turbine generator; and step VI, modeling a wind power farm into a conventional unit in a plurality of derated states and performing reliability calculation. The method is suitable for analyzing the reliability of a feeder line radiation type power distribution system and a power distribution system with distributed wind power supply, and the method not only solves the modeling problem of a power supply point in the reliability calculation after a distributed wind turbine generator is connected to the power distribution network, but also solves the problem that the analytical method cannot be used for calculation during reliability analysis of the power distribution network with distributed power.

Description

technical field [0001] The invention relates to a method in the field of distribution system reliability assessment, in particular to a method for determining the reliability of a distribution network containing decentralized wind power based on an analytical method. Background technique [0002] The research on the reliability of power distribution system began in the early 1980s. The commonly used reliability of power distribution system is Failure Mode Effects Analysis (FMEA), which uses reliability data of components (lines, circuit breakers, disconnectors, transformers) , establish a failure mode consequence table, analyze each failure event and its consequences, and then form a comprehensive reliability index. [0003] In recent years, more and more distributed power sources have been connected to the distribution network. As a large number of distributed power sources are connected to the distribution network, the analysis and calculation model of their reliability h...

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Problems solved by technology

[0007] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for determining the reliability of a distribution network with distributed wind power based on an analytical method, which is suitable for analyzing the reliability of feeder-radiating power distribution systems and distribution systems with distributed wind power access. Reliability, on the one hand, it solves the modeling problem of the power point in the reliability calculation after the distributed wind turbines are connected to the distribution network, and on the other hand, it solves the problem that the reliability analysis of the distributed power distribution network cannot be calculated by analytical methods

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