Phase-locked control method for photovoltaic grid-connected converter during voltage distortion of distribution network comprising electric arc furnaces

Abstract

The invention discloses a phase-locked control method for a photovoltaic grid-connected converter during voltage distortion of a distribution network comprising electric arc furnaces. The invention belongs to the technical field of photovoltaic grid-connected power generation. In order to better verify the effectiveness of the phase-locked loop control method for a photovoltaic grid-connected converter under the condition that photovoltaic power is incorporated into a distribution network with a high proportion of electric arc furnaces, an electric arc furnace load model and a photovoltaic array model containing MPPT are respectively established, and a system simulation model is built based on an actual power grid system. According to the method, a self-adjusting double-SOGI (MAF-SASOGI) phase-locked control method comprising an ideal low-pass filter is adopted, and a photovoltaic power generation system can still be effectively connected to the grid when the voltage of the distribution network is seriously distorted.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected power generation, and in particular relates to a phase-locked control method for a photovoltaic grid-connected converter when the voltage of a distribution network including an electric arc furnace is distorted. Background technique [0002] As fossil fuel reserves are depleted, renewable energy sources (RES) will become an increasingly important part of electricity generation. Among the existing RES technologies, solar energy is the most promising option due to its ubiquity, free and environmental friendliness. It is the advantages of solar energy that make photovoltaic (PV) systems more and more widespread in both developed and developing countries. However, with the rapid development of the economies of various countries, the power load has increased very rapidly, especially the wide application of AC arc steelmaking furnace shock loads has caused some distribution network ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that part of the distribution network contains a large number of electric arc furnace nonlinear loads, which cause grid voltage distortion and make the photovoltaic system unable to be effectively connected to the grid. The phase-locked control method of the converter realizes that the photovoltaic power generation system can still be effectively connected to the grid when the distribution network voltage is severely distorted

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