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Component voltage limiting method and application device and system thereof

A component and voltage limiting technology, which is applied in the component voltage limiting method and its application device and system field, can solve the problems of limited number of components connected in series and low DC voltage utilization rate of the system, so as to improve the DC voltage utilization rate and DC/ The effect of AC capacity matching ratio, increasing the number of series connection, and reducing system cost

Inactive Publication Date: 2020-08-21
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] The invention provides a module voltage limiting method and its application device and system to solve the problems in the prior art that the number of modules connected in series is limited and the utilization rate of the system DC voltage is low

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  • Component voltage limiting method and application device and system thereof
  • Component voltage limiting method and application device and system thereof
  • Component voltage limiting method and application device and system thereof

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Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0052] The invention provides a component voltage limiting method to solve the problems in the prior art that the number of components connected in series is limited and the utilization rate of the system DC voltage is low.

[0053] See figure 2 , the component pressure limiting method includes:

[0054] S101. Detecting parameters of photovoltaic cell strings;

[0055] A photovoltaic cell string includes a plurality of photovoltaic cells connected in series, and the photovoltaic cell may...

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Abstract

The invention provides an assembly voltage limiting method, an application device and system thereof. According to the method, by detecting the parameters of a photovoltaic cell string, whether the parameters of the photovoltaic cell string meet a voltage limiting enabling condition or a voltage limiting releasing condition is judged; if the parameters of the photovoltaic cell string meet the voltage limiting enabling condition, at least one photovoltaic cell in the photovoltaic cell string is controlled to work in a voltage limiting mode, so that the voltage of the photovoltaic cell string isreduced, the number of photovoltaic modules connected in series can be increased while it is guaranteed that the highest voltage of the system does not exceed the corresponding requirement, and the system cost is reduced; and if the parameters of the photovoltaic cell string meet the voltage limiting release condition, the photovoltaic cells working in the voltage limiting mode are controlled torecover normal output, so that the output voltage of the photovoltaic cell string is improved so as to improve the DC voltage utilization rate and the DC / AC capacity ratio of the photovoltaic system.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a component voltage limiting method and its application device and system. Background technique [0002] The photovoltaic power generation system is mainly composed of photovoltaic modules and inverters. Several photovoltaic modules are connected in series and parallel, and then the DC voltage is imported into the inverter, and then the inverter converts the DC voltage into AC voltage and supplies it to the grid or load. [0003] As the power level of the inverter continues to increase, the more photovoltaic modules in the system are connected, the lower the system cost. However, when multiple photovoltaic modules are connected in series, the maximum voltage of the system must not exceed 1500V, which limits the number of connected photovoltaic modules. [0004] And because the output power of photovoltaic modules is constantly changing with the voltage, such as figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02S50/00
CPCH02S50/00H02J3/38H02S40/30Y02E10/50
Inventor 曹仁贤杨宗军徐君云平
Owner SUNGROW POWER SUPPLY CO LTD
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