Photovoltaic system and photovoltaic turn-off method

A photovoltaic and circuit breaker technology, which is applied to photovoltaic power generation, photovoltaic modules, AC network circuits, etc., can solve problems such as photovoltaic system mismatch, photovoltaic string 10 cannot enter a safe state, and circuit breaker 12 cannot be shut down in time. , to achieve the effect of ensuring a safe state

Pending Publication Date: 2021-11-09
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0003] However, when the number of photovoltaic modules 11 included in each of the photovoltaic strings 10 connected to the inverter 20 is not exactly the same, there is a mismatch phenomenon in the photovoltaic system, so that the switch 12 in the photovoltaic string 10 cannot be turned off in time. disconnected, the PV string 10 cannot enter the safe state

Method used

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  • Photovoltaic system and photovoltaic turn-off method
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  • Photovoltaic system and photovoltaic turn-off method

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Embodiment Construction

[0057] 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.

[0058] In this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. an actual relationship or order. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements inc...

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Abstract

The invention provides a photovoltaic system and a turn-off control method. In the photovoltaic turn-off method, if an inverter enters a safe state, the input voltage of turn-off devices at the preceding stage of the inverter are reduced, so that the turn-off devices enter a shutdown state or an under-voltage protection state, namely, the turn-off devices are turned off; and when the turn-off devices at the preceding stage of the inverter are turned off, photovoltaic strings can enter a safe state. Therefore, according to the photovoltaic turn-off method provided by the invention, when the inverter enters a safe state, the photovoltaic strings can be ensured to enter a safe state.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic system and a shutdown control method. Background technique [0002] exist figure 1 In any photovoltaic string 10 of the photovoltaic system shown, the output end of each photovoltaic module 11 is connected to the output end of a switch 12, and the two poles of the output end of each switch 12 are cascaded to the corresponding photovoltaic string. 10 of the output; wherein, the specific structure of the switch 12 is as figure 2 As shown, the processor 01 of the switch 12 collects the output current through the current collection unit 02, and shuts itself off when the output current is too small, thereby cutting off the connection between the corresponding photovoltaic module 11 and the inverter 20. When all the disconnectors 12 in the string 10 are turned off, the photovoltaic string 10 of this way enters a safe state. [0003] However, whe...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02S40/32
CPCH02J3/381H02S40/32H02J2300/24Y02E10/50Y02E10/56
Inventor 杨宇陈巧地
Owner SUNGROW POWER SUPPLY CO LTD
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