Power distribution network equivalent method considering multiple random factors

Abstract

The invention discloses a power distribution network equivalent method considering multiple random factors. The method comprises the steps that models are built for renewable energy, stored energy and load in a power distribution network; by means of the built mathematic models, output curves or power requirement curves of the renewable energy, the stored energy and the load in a time period are simulated; the output curves or power requirement curves of the random factors such as the renewable energy, the stored energy and the load are discretized by selecting appropriate step sizes, and outage tables of the renewable energy, the stored energy and the load are calculated; and finally, convolution calculation is conducted on the outage tables of the random factors in the power distribution network, and a power distribution network equivalent model in a general outage table form can be obtained. According to the equivalent method, the nondeterminacy of the renewable energy, the stored energy output and the load demand in the power distribution network can be well reflected, and the built equivalent model can conduct related calculation of power grid planning by combining an analysis method or a simulation method and has the good generality.

Description

technical field [0001] The invention belongs to the field of power grid planning, and relates to a distribution network equivalent method considering various random factors such as renewable energy, energy storage and controllable loads (hereinafter referred to as "random factors"), and particularly relates to the output characteristics of various random factors The modeling and convolution computation of outage tables. Background technique [0002] Power grid planning (i.e., transmission network planning) is an important part of power system planning. Its work is to determine the optimal grid structure according to the load growth and power supply planning during the planning period to meet the needs of economical and reliable power transmission. Traditional power grid planning is completed under the conditions of power planning capacity, planning location, commissioning time and forecasted load. [0003] In recent years, due to the depletion of fossil energy such as oil, ...

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Problems solved by technology

However, random factors such as renewable energy, energy storage, and controllable loads are mostly connected to the power system from the distribution network, and the uncertainty of random factors in the distribution network is usually not considered in traditional grid planning.

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