Fault diagnosis method and device for photovoltaic power station
A photovoltaic power station and fault diagnosis technology, applied in photovoltaic power generation, photovoltaic system monitoring, photovoltaic modules and other directions, can solve problems such as hidden safety hazards and difficult detection of hidden faults of photovoltaic power stations, and achieve the effect of improving safety.
Pending Publication Date: 2022-01-07
SHENYANG POLYTECHNIC UNIV
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[0003] The purpose of the present invention is to provide a fault diagnosis method and device for a photovoltaic power station, so as to solve the problem that the early high-resistance grounding fault of a photovoltaic power station is difficult to detect as an invisible fault, resulting in a great potential safety hazard
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[0054]In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.
[0055] It should be noted that the terms used herein are for the purpose of describing specific embodiments only, and are not intended to limit exemplary embodiments according to the present invention. As used herein, singular forms are intended to include plural forms unless the context clearly dictates otherwise. In addition, it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, it indicates the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the...
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The embodiment of the invention discloses a fault diagnosis method and device for a photovoltaic power station. The method comprises the following steps: determining transient zero-mode current signals based on real-time current signals, decomposing each transient zero-mode current signal, determining a target intrinsic mode function component, based on all target intrinsic mode function components, obtaining related parameters of the target intrinsic mode function component, and determining whether the DC circuit is abnormal or not through a random forest model based on the related parameters of the target intrinsic mode function component; if the DC circuit is abnormal, judging whether the DC circuit break has an impedance grounding fault or not according to the target intrinsic mode function component corresponding to the abnormal condition; and if the impedance grounding fault occurs in the DC circuit, determining the type of the impedance grounding fault through the random forest model. Therefore, the method can accurately detect the early-stage high-resistance grounding fault, thereby improving the safety of the photovoltaic power station.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a fault diagnosis method and device for a photovoltaic power station. Background technique [0002] Photovoltaic power station is a power generation system that directly converts light energy into electrical energy, so photovoltaic power station has been more and more widely used. However, the early high-resistance ground faults of photovoltaic power plants are difficult to detect as invisible faults, which leads to great safety hazards. Contents of the invention [0003] The purpose of the present invention is to provide a fault diagnosis method and device for a photovoltaic power station to solve the problem that the early high-resistance grounding fault of the photovoltaic power station is difficult to detect as an invisible fault, resulting in a great potential safety hazard. [0004] In the first aspect, an embodiment of the present invention provide...
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Login to View More IPC IPC(8): G06F30/27G06Q10/00G06Q10/06G06Q50/06H02S50/00
CPCG06F30/27G06Q10/06393G06Q10/20G06Q50/06H02S50/00Y02E10/50Y04S10/50
Inventor 王晓东王若瑾刘颖明
Owner SHENYANG POLYTECHNIC UNIV