Fault detection system and method suitable for photovoltaic array

Abstract

The invention discloses a fault detection system and method suitable for a photovoltaic array, and relates to the technical field of photovoltaic fault detection. The method comprises the following steps: calculating the maximum output power of a photovoltaic array under the simulation condition, and simultaneously recording the current value and the voltage value when the maximum output power isobtained; measuring the I-V characteristic, and after measurement of many times, obtaining a short-circuit current value, open-circuit voltage and a P-V curve peak value number of the photovoltaic array from an I-V curve; comparing the theoretical output power in simulation with the actual output power, and judging the mode of the photovoltaic array by an area where the ratio of the theoretical output power and the actual output power is; If the photovoltaic array is judged to be faulty, further judging the fault type, and using a threshold value method to isolate the faults with different attributes; and distinguishing two sets of faults with the same attribute by an extendable network model. The method can not only discover the fault on line when the photovoltaic array fails, but can also quickly locate the fault type.

Description

technical field [0001] The invention relates to the technical field of photovoltaic array fault detection, in particular to a fault detection system and method suitable for photovoltaic arrays. Background technique [0002] Solar energy is an important energy source. At the same time, in order to solve the increasingly severe energy shortage and environmental problems, grid-connected photovoltaic power generation technology has developed rapidly in the past ten years, and will continue to develop rapidly in the next decade. Photovoltaic systems have no moving parts and low maintenance costs, but they are exposed to complex outdoor environments for a long time and are subjected to various harsh environmental factors, which will lead to various failures. These failures will not only cause power loss and affect power generation efficiency, but also shorten the service life of components. In severe cases, local overheating may even cause fires, bringing immeasurable losses to ph...

AI Technical Summary

Problems solved by technology

Photovoltaic systems have no moving parts and low maintenance costs, but they are exposed to complex outdoor environments for a long time and are subjected to various harsh environmental factors, which can lead to various failures

These failures will not only cause power loss and affect power generation efficiency, but also shorten the service life of components. In severe cases, local overheating may even cause fires, bringing immeasurable losses to photovoltaic power plants.

However, the traditional fault detection usually adopts the offline form of manual investigation, and the response time is very slow when a fault occurs.

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