Photovoltaic system

A photovoltaic system and photovoltaic cell technology, applied in the electronic field, can solve problems such as increasing equipment costs

Active Publication Date: 2016-08-03
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technical solution, each photovoltaic cell string needs to be connected with a current sensor, resulting in increased equipment cost

Method used

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Embodiment Construction

[0020] 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 some of the embodiments of the present invention, but 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 creative efforts fall within the protection scope of the present invention.

[0021] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a photovoltaic system proposed by an embodiment of the present invention. Such as figure 1 As shown, the photovoltaic system includes a plurality of photovoltaic cell strings, converters, controllers and busbars. The plurality of photovoltaic cell strings includes at least one string group that is connected to a current sensor after two or three photovoltaic cell strin...

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Abstract

The embodiment of the invention discloses a photovoltaic system comprising multiple photovoltaic cell strings, a converter, a controller, and buses. The multiple photovoltaic cell strings include at least one string group formed by connecting two or three photovoltaic cell strings in series and then connecting the photovoltaic cell strings to a current sensor. The at least one string group is connected to the converter through the buses after being connected in parallel. The controller is connected with the current sensor in each of the at least one string group. Each current sensor is used for detecting the total current of the corresponding string group and reporting to the controller whether there is reverse current in the corresponding string group. The controller is used for adjusting a control signal output to the converter when receiving a message indicating that there is reverse current in a target string group among the at least one string group reported by the current sensors. The converter is used for decreasing the system voltage between the buses according to the adjusted control signal so as to reduce the reverse current in the target string group. Photovoltaic cell protection is provided, and the equipment cost is reduced.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a photovoltaic system. Background technique [0002] In the application scenario of photovoltaic inverters, photovoltaic cells are connected in series and parallel to provide output voltage and output current to the load. However, if one of the photovoltaic cell strings is short-circuited, it may cause other photovoltaic cell strings to pour reverse current into the short-circuited photovoltaic cell string. If the reverse current is greater than the short-circuit current of the photovoltaic cell, it may cause the faulty photovoltaic cell string to In severe cases, it may even cause a fire. Therefore, it is necessary to add corresponding protection measures for photovoltaic cell strings to avoid major accidents. [0003] In the existing technical scheme, each photovoltaic cell string is connected with a current sensor, and each current sensor detects the current of each photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S10/00H02S40/30
CPCH02S50/00H01L31/02021H02J2300/24H02J3/381Y02E10/56H02J3/46Y02E10/50H02M1/0009H02M1/084H02M3/04H02M7/44
Inventor 石磊叶飞刘云峰
Owner HUAWEI DIGITAL POWER TECH CO LTD
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