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Power derating method of photovoltaic power generation system and controller

A photovoltaic power generation system and controller technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as increased device stress and reduced power quality, to reduce output power, avoid increased device stress, and avoid reduced power quality Effect

Active Publication Date: 2017-09-12
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0005] The invention provides a power derating method and controller of a photovoltaic power generation system to solve the problems of increased device stress and reduced power quality in the prior art

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  • Power derating method of photovoltaic power generation system and controller
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  • Power derating method of photovoltaic power generation system and controller

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Embodiment Construction

[0053] 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.

[0054] The invention provides a power derating method of a photovoltaic power generation system to solve the problems of increased device stress and reduced power quality in the prior art.

[0055] Specifically, the power derating method of the photovoltaic power generation system is applied to the controller of the photovoltaic power generation system, and the controller is connected to the shutdown device in communication; The output terminals of the photovoltaic modules are connected in ...

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Abstract

The invention provides a power derating method of a photovoltaic power generation system and a controller. A power derating value is acquired, and output power of a photovoltaic component run by a current system is calculated. Calculation is carried out according to the power derating value and the output power of the photovoltaic component run by the current system, and the number of the photovoltaic components, the outputs of which are required to be switched off, is acquired, and then according to the number of the photovoltaic components, the outputs of which are required to be switched off, the photovoltaic components, the outputs of which are required to be switched off, are determined. A switch-off instruction is transmitted to switching-off devices connected with the photovoltaic components, the outputs of which are required to be switched off, to control the switching off of the related switching-off device. Output power of a whole photovoltaic array is reduced without adopting the prior art of increasing the operation voltage of the whole system, and the derating operation of the photovoltaic power generation system is realized, and problems such as device stress increase and electric energy quality reduction are prevented.

Description

technical field [0001] The invention relates to the technical field of power control of a photovoltaic power generation system, in particular to a power derating method and a controller of a photovoltaic power generation system. Background technique [0002] In the photovoltaic power generation system, when the inverter detects that its internal temperature is too high, it needs to adjust the power to make it run in the reduced power mode; or when the grid has a scheduling demand for the feed, the inverter also needs to adjust the output Power, reduce or restore grid-connected feed power. [0003] In the prior art, the power derating output method of the photovoltaic power generation system is to change the command voltage of MPPT through the inverter to increase the output voltage of the photovoltaic module, and its operating point deviates from the maximum power point. figure 1 is the P-U characteristic curve of the photovoltaic module. When the inverter is adjusted to de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46
CPCH02J3/383H02J3/46Y02E10/56
Inventor 杨宗军詹亮俞雁飞邹云飞
Owner SUNGROW POWER SUPPLY CO LTD
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