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Photovoltaic rapid turn-off system and control method thereof

A control method and fast technology, applied in the fields of photovoltaic power generation, AC network circuits, electrical components, etc., can solve the problems of continuous current or voltage disturbance, output power exceeding the power limit value, etc., to avoid continuous application of electrical signal disturbance, avoid System power loss and effects of system failure

Active Publication Date: 2021-05-14
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the inverter is under the condition of limiting output power, it cannot apply continuous current or voltage disturbance, otherwise the output power will exceed the power limit value

Method used

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  • Photovoltaic rapid turn-off system and control method thereof
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  • Photovoltaic rapid turn-off system and control method thereof

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Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0052] In this application, 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 includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by t...

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Abstract

The invention provides a photovoltaic rapid turn-off system and a control method thereof. An inverter enters a period in each turn-off state of a turn-off device in the system when the system is in a limited power operation state, and electric signal disturbance is applied to a DC bus of the system at least once; each turn-off device can detect the input parameter and / or the output parameter of the turn-off device so as to judge whether the electric signal disturbance of the direct current bus connected with the turn-off device meets a preset condition or not; and if the judgment result is yes, the turn-off device enters or maintains an on state. Namely, according to the control method of the photovoltaic rapid turn-off system provided by the invention, the inverter intermittently applies the electric signal disturbance to the DC bus so that the turn-off device can be ensured to maintain the on state, and the loss of the power generation capacity of the system caused by mistaken turn-off of the turn-off device is avoided; and when the photovoltaic rapid turn-off system is in a limited power operation state, the inverter can be prevented from continuously applying electric signal disturbance, and the output power is ensured not to exceed a power limit value.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic rapid shutdown system and a control method thereof. Background technique [0002] In the prior art, out of consideration for the safety of photovoltaic operation and maintenance personnel, the photovoltaic shutdown system in this field needs to ensure that the output of the photovoltaic string is in a safe state even in the case of a single component or module failure. In order to achieve the purpose of output safety under single-point failure, the heartbeat method is usually used, specifically: continuously send the turn-on signal to the switch in the photovoltaic shutdown system, so that it maintains its own turn-on state; when the turn-on signal disappears, turn off The breaker controls its own output to limit the output state, and disconnects the corresponding photovoltaic module. [0003] However, in the actual operation of the photovolt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381H02J2300/24Y02E10/56H02J3/007H02J3/14H02J3/1878H02J3/388H02J2203/10
Inventor 杨宇徐君陈巧地
Owner SUNGROW POWER SUPPLY CO LTD
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