Estimation method for influence of power fluctuation of intermittent energy source on voltage of multi-stage power distribution network

Abstract

The invention relates to an estimation method for influence of power fluctuation of an intermittent energy source on a voltage of a multi-stage power distribution network. The estimation method mainlycomprises the following steps of 1) defining an intermittent energy source depth index, thereby defining an index of the influence of the power fluctuation of the intermittent energy source in the multi-stage power distribution network on a voltage of a grid-connected voltage; and 2) defining topologically-connected intermittent energy source grid-connected depth index and a node average voltageof a node load of the multi-stage power distribution network, thereby defining an index of the influence of the fluctuation of the intermittent energy source in the multi-stage power distribution network. The fitting between an index value calculated by the method and an actual value is relatively good, and the voltage of the multi-stage power distribution network can be estimated.

Description

technical field [0001] The invention relates to the technical field of power grid voltage control, in particular to a method for evaluating the impact of intermittent energy power fluctuations on the voltage of a multi-level distribution network. Background technique [0002] With the continuous development of economy and technology, the demand for energy is increasing. The shortage of traditional energy sources and the increasing adverse impact of fossil energy on the environment have promoted the development of renewable energy sources, including wind power and photovoltaic power generation. However, due to the intermittent and random nature of the output of these renewable energy sources, such as wind power generation is affected by wind speed, and photovoltaic output is closely related to weather conditions, the large-scale grid-connection of these distributed energy sources will improve the power quality of the distribution network and the reliability of power supply. ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned difficulties in the prior art, aiming at the problem of over-limit voltage that is easily caused by a large number of grid-connected high-permeability intermittent energy sources on the active distribution network, and to define an index that considers the impact of intermittent energy power fluctuations on voltage, Estimate the voltage change caused by intermittent energy output fluctuations under the condition of meeting a certain accuracy, so as to evaluate the impact of intermittent energy output fluctuations on the operating state of the distribution network

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