Photovoltaic system direct-current side current fault detection method and device

Abstract

The invention relates to a photovoltaic system direct current side current fault detection method and device. The method comprises the steps of acquiring current data of all strings in each photovoltaic array at the same moment in a photovoltaic power station by a server; grouping the current data of all strings in each photovoltaic array by adopting preset grouping rules to obtain a plurality ofcurrent data subsets corresponding to the photovoltaic arrays; and carrying out fault detection on the plurality of current data subsets of the photovoltaic arrays according to a Grubbs method to obtain a fault detection result of current data in each current data subset. In the method, the server carries out fault detection on each grouped current data subset through the simple Grubbs method, a complex mathematical model according to each photovoltaic array does not need to be constructed, the whole fault detection process is simplified, the fault detection cost is reduced, the convenient andtimely discovery of a fault point is achieved, and the fault detection efficiency is improved.

Description

Technical field [0001] This application relates to the technical field of photovoltaic power plants, and in particular to a method and device for detecting a DC side current fault of a photovoltaic system. Background technique [0002] In recent years, centralized photovoltaic power plants have been integrated into distributed photovoltaic power plants. The photovoltaic components in distributed photovoltaic power plants are usually connected in series and parallel. When a photovoltaic component fails, especially the common DC side failure of photovoltaic power plants, For example, short-circuit of modules, open circuit of modules, shadow shielding, etc., will have an adverse effect on the entire photovoltaic array, greatly reducing the power generation of photovoltaic power plants, which will greatly affect the overall revenue of photovoltaics. [0003] In the prior art, fault diagnosis of distributed photovoltaic power plants by constructing complex mathematical models and algori...

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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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