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Device and method for detecting faults of solar power generation system

A fault detection and power generation system technology, applied in the field of solar photovoltaic power generation, can solve the problems of cumbersome replacement of fuses

Active Publication Date: 2014-04-09
EAST GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a fault detection device and method for a solar power generation system to detect the open-circuit voltage and short-circuit current of each solar panel string, and solve the problem of cumbersome replacement of fuses

Method used

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  • Device and method for detecting faults of solar power generation system

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0024] figure 1 A first embodiment of the invention is shown.

[0025] figure 1 is a schematic diagram of a fault detection device for a solar power generation system provided in the first embodiment of the present invention, wherein the solar power generation system includes a plurality of solar panel strings and photovoltaic inverters, such as figure 1 As shown, the fault detection device of the solar power generation system provided in this embodiment includes a plurality of fault detection units 110 , a confluence device...

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Abstract

The invention discloses a device and method for detecting faults of a solar power generation system. The solar power generation system comprises a plurality of solar cell panel set strings and a photovoltaic inverter. The device comprises a plurality of fault detecting units, a current converging device, a control system and an auxiliary power source. Each fault detecting unit comprises a control switch, the input ends of the fault detecting units are connected with the solar cell panel set strings respectively, the output ends of the fault detecting units are connected with the input end of the current converging device, and the fault detecting units are used for detecting the relevant parameters of the solar cell panel set strings, wherein the relevant parameters comprise the working voltage and the working current or the open-circuit voltage and the short-circuit current. The current converging device is used for collecting the direct currents output by the fault detecting units. The control system is connected with the fault detecting units, and is used for comparing the relevant parameters with the history parameters of each solar cell panel set string, analyzing the fault situation and controlling the on-off state of the control switches according to the fault situation. The auxiliary power source is used for supplying electricity to the fault detecting units and the control system. The device can directly detect the open-circuit voltage and the short-circuit current, and a fuse is prevented from being replaced.

Description

technical field [0001] Embodiments of the present invention relate to solar photovoltaic power generation technology, and in particular to a fault detection device and method for a solar power generation system. Background technique [0002] The solar photovoltaic power generation system uses solar panels as the energy supply unit of the photovoltaic inverter, which is converted into alternating current through the inverter and sent to the grid. Due to the small voltage and power of a single solar panel, usually multiple solar panels are connected in series to form a solar panel string to increase the total output voltage, and multiple strings are connected in parallel to increase the output current, and then through the combiner box These strings are collected and then sent to the photovoltaic inverter. For high-power inverters, multiple combiner boxes are usually used as the combiner device. [0003] For a megawatt-level solar photovoltaic power generation system, it usua...

Claims

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Application Information

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IPC IPC(8): H02S50/00
CPCY02E10/50
Inventor 陈书生
Owner EAST GRP CO LTD
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