System and method for detecting fuse state of combiner box

A state detection and fuse technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of inconvenient maintenance and repair of photovoltaic power generation systems, inability of photovoltaic power generation systems to accurately determine fuses, and no fuse state detection function, etc. Achieve the effect of online fault diagnosis and detection function, high degree of automation and intelligence, and easy replacement

Active Publication Date: 2012-07-25
EAST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the combiner box products on the market generally do not have the fuse status detection function. If some fuses are burned, the photovoltaic power generation system cannot accurately determine which fuse is burned, which brings great difficulties to the maintenance and repair of the photovoltaic power generation system. It is very inconvenient, so it is necessary to develop a detection circuit that can automatically detect the state of each fuse online

Method used

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  • System and method for detecting fuse state of combiner box
  • System and method for detecting fuse state of combiner box
  • System and method for detecting fuse state of combiner box

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Embodiment Construction

[0058] The present invention is described in detail in conjunction with the accompanying drawings.

[0059] figure 1 It is a block diagram of the implementation principle of the combiner box fuse state detection system, and the multi-channel photovoltaic cell input adopts the form of common negative pole. Take the nth road as an example, figure 1 Indicates the block diagram of the state detection principle of the nth photovoltaic cell PV input fuse, n=1, 2, 3,..., N, where N represents the maximum number of input circuits of the photovoltaic cell in the combiner box.

[0060] The anode PVn+ of the photovoltaic cell input in this way is connected to the anode Dn+ of the anti-reverse diode Dn, the cathode Dn- of the anti-reverse diode Dn is connected to one end of the first fuse Fn1 of this way, and the other end of the first fuse Fn1 is connected to the input One end of the current sampling circuit CTn is connected, and the other end of the input current sampling circuit CTn ...

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Abstract

The invention relates to a combiner box system, and particularly discloses a system and a method for detecting the fuse state a combiner box. The system comprises an anti-reverse diode, fuses, a photovoltaic battery input current sampling circuit, a photovoltaic battery input voltage sampling circuit, a bus rod voltage sampling circuit, a first detection circuit, a second detection circuit, a third detection circuit and a processing unit, and the system can monitor that the fuses of the combiner box are in the normal state or in the burned failure state. The invention provides the system for detecting the fuse of the combiner box, which is modularized, easy to expand and has real-time online monitoring function, and the invention provides the method for diagnosing the failure of the fuse of the combiner box in real time for a photovoltaic power generation system.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a fuse state detection system and a method for a combiner box. Background technique [0002] In large-scale photovoltaic power plants, due to the small capacity of a single set of photovoltaic cell components, it is difficult to meet the requirements of megawatt-level photovoltaic power plants. The combiner box is the key conversion link for collecting, distributing and expanding energy after photovoltaic cells collect solar energy. A certain number of photovoltaic cells with the same specifications are connected to form a photovoltaic series, and then several photovoltaic series are connected in parallel to the photovoltaic combiner box. After converging in the combiner box, it is output after passing through the lightning protector and DC circuit breaker, and is used together with the photovoltaic inverter to form a complete photovoltaic power generation s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/07G01R31/74
Inventor 韩军良郑照红徐海波
Owner EAST GRP CO LTD
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