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

A technology of voltage distortion and control method, applied in the direction of automatic power control, AC network voltage adjustment, photovoltaic power generation, etc., can solve problems such as grid voltage distortion, photovoltaic system cannot be effectively connected to the grid

Active Publication Date: 2020-07-10
ANSHAN POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER COMPANY +3
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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 t

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

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[0061] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with specific examples, which should be understood by those skilled in the art. The content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention, and the parts not described in the present invention are applicable to the prior art.

[0062] It should be understood that, in the description of the present invention, SOGI is a second-order generalized integrator, and MAF-SASOGI is a self-adjusting double SOGI integrator containing an ideal low-pass filter;

[0063] The present invention combines theoretical analysis with actual power grid conditions, and then provides a photovoltaic parallel with a self-adjusting dual SOGI phase-locked loop with an ideal low-pass filter, which is accurate and fast, and has high practical value. The phase-locked control method of th...

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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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Application Information

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IPC IPC(8): H02J3/44H02J3/01H02J3/12H03L7/08
CPCH02J3/44H02J3/01H02J3/12H03L7/08Y02E10/56Y02E40/40
Inventor 刘诚石振宇夏岩峰丁力田立平
Owner ANSHAN POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER COMPANY
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