Photovoltaic system DC side current fault detection method and device

Abstract

The present application relates to a method and device for detecting a DC side current fault of a photovoltaic system. The method includes: the server obtains the current data of all strings in each photovoltaic array at the same moment in the photovoltaic power station, and uses a preset grouping rule to group the current data of all strings in each photovoltaic array to obtain the current data of each string in each photovoltaic array. Multiple current data subsets corresponding to the array, so according to the Grubbs method, fault detection is performed on the multiple current data subsets of each photovoltaic array, and the fault detection results of each current data in each current data subset are obtained. In this method, the server performs fault detection on each subset of current data after grouping through the simple Rabs-Grubbs method, and does not need to construct a complex mathematical model based on each photovoltaic array, which simplifies the entire fault detection process and reduces fault detection time. The cost is realized, and the fault point is found conveniently and timely, and the efficiency of fault detection is improved.

Description

technical field [0001] The present application relates to the technical field of photovoltaic power plants, in particular to a method and device for detecting current faults on the DC side of a photovoltaic system. Background technique [0002] In recent years, centralized photovoltaic power stations have been integrated into distributed photovoltaic power stations. The photovoltaic modules in distributed photovoltaic power stations are usually connected in series and parallel. When a photovoltaic module fails, especially the common DC side failure of photovoltaic power stations, Such as component short circuit, component open circuit, shadow occlusion, etc., will have an adverse impact on the entire photovoltaic array, which will greatly reduce the power generation of photovoltaic power plants, which will greatly affect the overall revenue of photovoltaics. [0003] In the existing technology, the fault diagnosis of distributed photovoltaic power plants is carried out by co...

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Problems solved by technology

[0002] In recent years, centralized photovoltaic power stations have been integrated into distributed photovoltaic power stations. The photovoltaic modules in distributed photovoltaic power stations are usually connected in series and parallel. When a photovoltaic module fails, especially the common DC side failure of photovoltaic power stations, Such as component short circuit, component open circuit, shadow occlusion, etc., will have an adverse impact on the entire photovoltaic array, which will greatly reduce the power generation of photovoltaic power plants, which will greatly affect the overall revenue of photovoltaics

[0003] In the existing technology, the fault diagnosis of distributed photovoltaic power plants is carried out by constructing complex mathematical models and algorithms. There are problems such as high cost, difficult modeling, and difficult extraction of fault samples, which are constrained in actual engineering applications.

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