Method for estimating reliability of electric distribution system containing distributive wind power, photovoltaic and energy storage devices

Abstract

The invention belongs to the field of power system reliability estimation, and relates to a method for estimating the reliability of an electric distribution system containing distributive wind power, photovoltaic and energy storage devices. The method comprises the following steps of: (1) acquiring configuration parameters of the electric distribution system; (2) forming a fault result list; (3) generating an energy storage charging and discharging state periodic list; (4) obtaining a normal running time TTF according to the fault rate of elements; (5) finding out an element which has TTFmin; (6) obtaining a fault time TTR according to the repair rate of the element, and calculating an energy storage state at the TTFmin moment; (7) searching the fault result list to determine a power failure situation of a load point in a non island area; (8) for an island area, calculating a draught fan real-time value, a photovoltaic real-time value and a load real-time value; (9) performing load attenuation on each island and recording the power failure situation of the load point in the island; (10) calculating the state variation of the energy storage of the island; (11) generating novel running time for the element and boosting a simulation clock to TTFmin+TTR; (12) searching for an element which is faulted at first again, and repeating the step (12) if the fault moment is less than the simulation clock, and if the fault moment is not less than the simulation clock, executing the step (13); and (13) judging whether the simulation clock is equal to a scheduled time length, and returning to the step (6) if the simulation clock is not equal to a scheduled time length; and if the simulation clock is equal to a scheduled time length, calculating a reliability index. By the method, the reliability level of the distribution system containing the distributive wind power, photovoltaic and energy storage devices can be estimated quantitatively.

Description

A Reliability Evaluation Method for Power Distribution System Containing Distributed Wind Power, Photovoltaic and Energy Storage technical field The invention belongs to the field of power system reliability evaluation, and relates to a reliability evaluation method of a power distribution system including distributed wind power, photovoltaic and energy storage devices. Background technique Power system reliability refers to the ability of the power system to provide uninterrupted power to power users in accordance with acceptable quality standards and required quantities. As the power system terminal directly connected to users, the reliability level of power distribution system has the most direct impact on users. In my country, the construction of power distribution system has been lagging behind the power transmission system for a long time. According to statistics, the source of about 80% of power outages in my country lies in the power distribution system. With the ...

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Problems solved by technology

Energy storage devices can play a role in smoothing the output of renewable distributed power, so the cooperation of energy storage and DG is the most potential development direction, but the existing distribution system reliability evaluation methods that include DG do not take storage into account. The influence of energy devices, the reliability of power supply cannot be evaluated for power distribution systems including distributed renewable power sources equipped with energy storage devices

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