Photoelectric system battery pack string fault identification method, device and equipment

Abstract

The embodiment of the invention provides a photoelectric system battery pack string fault identification method, device and equipment. The method comprises the steps that at least two sets of I-V values of a first battery pack string in a photoelectric system are acquired; fitting processing is performed by adopting a predetermined pack string physical model according to the at least two sets of I-V values so that at least one feature parameter of the first battery pack string is obtained; and the at least one feature parameter is compared with a standard feature parameter which is acquired in advance and whether the first battery pack string fails to work is determined, or curve fitting processing is performed on the acquired data through the pack string physical model so that the method can be widely applied, the feature parameters obtained through integrated processing of all the actually measured data of the battery pack strings are compared with the standard feature parameters when failure does not occur, misjudgment caused by test error of few points does not occur and judgment does not depend on the environment, and thus the scheme is not influenced by the inconsistent environment and processing efficiency and accuracy of pack string fault identification can be effectively enhanced.

Description

technical field [0001] Embodiments of the present invention relate to optoelectronic technology, and in particular to a method, device and equipment for identifying faults of battery strings in a photovoltaic system. Background technique [0002] A solar cell module is the basic unit of a photoelectric system (or photoelectric device) that implements photoelectric conversion, and can convert sunlight energy into DC power. In actual photovoltaic power station applications, multiple solar cell modules are generally connected in series to form a battery string, and then one or more parallel strings are connected to a grid-connected inverter, through which the DC power is converted into AC power and sent to the AC grid. [0003] The output power characteristics of solar cell modules are determined by factors such as the state of the cell itself, the intensity of external light, and the ambient temperature. When the battery module is working, the output power will decrease due t...

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Problems solved by technology

[0005] Embodiments of the present invention provide a method, device and equipment for identifying battery string faults in a photoelectric system, which are used to solve the problem in the prior art that the slope is discontinuous due to the error of sampling parameters at individual operating points, resulting in misjudgment of faults , and solve the problem of low fault identification accuracy caused by the inconsistent working conditions of the battery strings at different locations in the power station due to the ambient temperature and irradiance

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