Dual-mode controller, photovoltaic system and control method thereof

A photovoltaic system and control method technology, applied in photovoltaic power generation, AC network voltage adjustment, single network parallel feeding arrangement, etc. Effect

Pending Publication Date: 2022-08-02
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a control method for a photovoltaic system, aiming to solve the problem of repeated start-up when the illumination of the photovoltaic system is unstable

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  • Dual-mode controller, photovoltaic system and control method thereof
  • Dual-mode controller, photovoltaic system and control method thereof
  • Dual-mode controller, photovoltaic system and control method thereof

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Embodiment Construction

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053]In addition, descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the vario...

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Abstract

The invention discloses a dual-mode controller, a photovoltaic system and a control method thereof. The control method of the photovoltaic system comprises the following steps: controlling the photovoltaic system to start, and performing grid-connected operation in a current source mode; obtaining the output power of the photovoltaic system; when the output power of the photovoltaic system is smaller than the first preset power, the photovoltaic system is controlled to keep grid-connected operation in a current source mode, the output power of the photovoltaic system continues to be obtained, and when the output power of the photovoltaic system is larger than or equal to the first preset power, the photovoltaic system is controlled to be switched to grid-connected operation in a voltage source mode. In the starting process of the photovoltaic system, grid connection is carried out in the current source mode, so that the frequency fluctuation of the power grid is quickly responded, the reliability of the photovoltaic system during starting is improved, and after the output power is stable, the grid connection operation is switched to the voltage source mode, and the stability of the photovoltaic system during normal working is improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a dual-mode controller, a photovoltaic system and a control method thereof. Background technique [0002] At present, the photovoltaic system operates in the voltage source mode, so that the photovoltaic system can support the system in a low short-circuit ratio and weak AC system, and avoid the occurrence of problems such as frequency and voltage collapse, power oscillation and unit off-grid. [0003] However, in an environment with unstable illumination, such as in the morning, the power of the photovoltaic system when it is started and connected to the grid is small and unstable, which will cause the power to reverse due to the fluctuation of the grid frequency, that is, the current will flow back into the photovoltaic system, and then DC overvoltage occurs, causing the photovoltaic system to start up repeatedly or other failures. SUMMARY OF THE INVENTI...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/16
CPCH02J3/381H02J3/466H02J3/388H02J3/16H02J2300/24Y02E10/56
Inventor 陈方林潘年安梁城潘涛李壮壮
Owner SUNGROW POWER SUPPLY CO LTD
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