Reverse connection protection method and photovoltaic power generation system

A technology of photovoltaic power generation system and reverse connection protection, which is applied in the direction of photovoltaic power generation, electrical components, circuit devices, etc., and can solve problems such as arcing and inverter fire

Active Publication Date: 2019-03-22
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In a photovoltaic power generation system, multiple PV branches are connected to the inverter in parallel, and fuses (or circuit breakers) are usually connected in series on each PV branch. When the polarity of individual PV branches is reversed, the fuse on the branch (or circuit breaker) will disconnect the connection between the PV branch and the inverter due to the large reverse current flowing, but the voltage across the fuse (or circuit breaker) has reached 2 times the PV before disconnection Branch circuit voltage, and high voltage will cause arcing phenomenon when the fuse (or circuit breaker) is disconnected, which may cause the inverter to catch fire

Method used

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  • Reverse connection protection method and photovoltaic power generation system
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  • Reverse connection protection method and photovoltaic power generation system

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Embodiment Construction

[0039] 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, not all, embodiments of the present invention. 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.

[0040] The embodiment of the invention discloses a reverse connection protection method suitable for a photovoltaic power generation system. In the photovoltaic power generation system, multiple PV branches are connected in parallel to the inverter, and the energy output by the inverter is sent to the power grid after being processed by a filter circuit and other subsequent circuits, wherein the composition of the PV branches is based on the system structure D...

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Abstract

A reverse connection protection method and a photovoltaic power generation system are disclosed. The reverse connection protection method is applied to the photovoltaic power generation system. A plurality of PV branches are connected to an inverter in parallel in the photovoltaic power generation system, and each PV branch is connected with a fuse or a circuit breaker in series. The reverse connection protection method comprises the following steps: judging whether the polarity of the PV branches is opposite; if the polarity of the PV branches is opposite, controlling the switching state of each switch tube in the inverter so that the positive and negative poles of each PV branch are short-circuited and thus avoiding an arc pulling phenomenon when the fuse or the circuit breaker is disconnected.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a reverse connection protection method and a photovoltaic power generation system. Background technique [0002] In a photovoltaic power generation system, multiple PV branches are connected to the inverter in parallel, and fuses (or circuit breakers) are usually connected in series on each PV branch. When the polarity of individual PV branches is reversed, the fuse on the branch (or circuit breaker) will disconnect the connection between the PV branch and the inverter due to the large reverse current flowing, but the voltage across the fuse (or circuit breaker) has reached 2 times the PV before disconnection The branch circuit voltage, and the high voltage will cause arcing when the fuse (or circuit breaker) is disconnected, which may cause the inverter to catch fire. Contents of the invention [0003] In view of this, the present invention provides a rever...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02J3/38
CPCH02J3/383H02M1/32Y02E10/56
Inventor 潘年安冯纪归
Owner SUNGROW POWER SUPPLY CO LTD
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