Electric energy quality comprehensive assessment method of distributed generating system and micro power grid

Abstract

The invention relates to the electric energy quality comprehensive assessment, aims at providing an electric energy quality comprehensive assessment method of a distributed generating system and a micro power grid. The method comprises the following steps of: monitoring synchronized grid public coupling points to obtain monitoring data of each electric energy quality index; normalizing the data by using a maximin method; establishing a hierarchy assessment model and defining a corresponding sudden-change decision model; and obtaining the sudden-change grade of each layer from the lower layer to the top layer according to the sudden-change decision model, and finally obtaining the sudden-change grade of each synchronized grid public coupling point, that is, the electric energy quality comprehensive assessment index, wherein the greater the value is, the higher the grade of the corresponding electric energy quality is. The method provided by the invention has simple computation process and considers the nonlinear factor in the system, can provide the quantized index and basis for a power grid operator who fixes a price of the power to a distributed generating party according to the quality, and provides a reference target for the electric energy quality management. A corresponding compensating device can be mounted on the basis of the assessment method so as to flexibly customize the electric energy quality of the micro power grid.

Description

Technical field [0001] The invention relates to a distributed power generation system and a microgrid power quality comprehensive evaluation method, belonging to the field of electrical engineering and power quality comprehensive evaluation. Background technique [0002] The continuous consumption of fossil fuels has not only caused an increasingly tight energy supply, but also brought serious environmental problems. Energy-saving emission reduction, low-carbon, green power and other requirements have brought huge challenges to power supply. In addition, reflecting on the vulnerability of large power grids and the series of blackouts caused by them, it shows that distributed generation can improve the stability of the system to a certain extent. These factors together have stimulated the power system to pay more and more attention to renewable energy and distributed power generation systems. In recent years, distributed power generation systems such as large wind farms, photovo...

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Problems solved by technology

However, the difference in these prior information may lead to different evaluation results, with greater uncertainty and poor operability

In addition, many methods are either computationally complex and time-consuming, or use

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