Photovoltaic array fault detection device and method

Abstract

The invention discloses a photovoltaic array fault detection device and method, and belongs to the field of photovoltaic array monitoring. The device is mainly composed of a controller, an illumination temperature sensor, a voltage sensor, a current sensor and a relay module. Various detection values collected by the device are transmitted to an upper computer, and the upper computer establishes asuspected fault list through fault screening, selects a photovoltaic module with a suspected fault from the photovoltaic array, and removes the photovoltaic module from the array; then capacitors aremerged into the two sides of the suspected fault module, and a plurality of working point data on the characteristic curve of a module UI are collected, and the internal parameter normalization valueof the module is solved; the normalized value is input into an integrated CART classification tree model established in advance to judge the specific state of the module, and if it is determined thatthere is no fault, the corresponding module is re-connected to the system; and if a fault is judged, a fault list is established according to the fault index, so that workers can conveniently carry out maintenance. The device has the advantages of being simple in structure, relatively low in cost, rapid in diagnosis, timely in fault treatment and the like.

Description

technical field [0001] The invention relates to the field of photovoltaic array monitoring, in particular to a photovoltaic array fault detection device and method. Background technique [0002] With the increasingly prominent energy crisis and environmental pollution, all countries have increased the research and promotion of renewable energy. Photovoltaic power generation technology has been widely developed and applied due to its unique power generation characteristics. However, due to the large number of components in the photovoltaic array, the probability of various failures is high. If it is not dealt with in time, it may cause accidents, affect the efficiency of the entire power station, and cause economic losses. Therefore, effective measures must be taken to detect faults in time to ensure reliable and stable operation of the system. At present, many scholars have studied the fault diagnosis of photovoltaic arrays and proposed many fault diagnosis schemes. For ex...

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Problems solved by technology

[0003] Aiming at the impractical and inaccurate fault diagnosis methods in the existing photovoltaic array fault monitoring, the array needs to be offline during the diagnosis process, and there is a long delay in the processing of faults

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