Photovoltaic power plant string fault diagnosis method, device, equipment and readable storage medium

Abstract

The invention belongs to the technical field of solar power generation, and discloses a photovoltaic power station string fault diagnosis method, device, equipment and readable storage medium, which are applied to a photovoltaic power station equipped with a string inverter, wherein the string inverter Possess an IV curve scanning function, and the diagnostic method includes the following steps: obtaining the IV curve scanning data of each string inverter of the photovoltaic power plant; counting the number of 0 current data whose current is 0 in the IV curve scanning data, according to removing 0 The IV curve scan data of the current data establishes the IV curve function corresponding to each string inverter and calculates the characteristic value of the IV curve function, calculates the characteristic value limit and the zero current data limit; according to the characteristic value limit and the zero current The data limit is judged to obtain the fault condition of the corresponding photovoltaic power plant string. Faults can be diagnosed by using the existing string inverters, the scanning calculation speed is fast, the fault diagnosis accuracy is high, the probability of missed detection is small, and the labor cost is low, which has great promotion value.

Description

technical field [0001] The invention belongs to the technical field of solar power generation, and relates to a fault diagnosis method, device, equipment and a readable storage medium for photovoltaic power station strings. Background technique [0002] In recent years, with the massive construction of photovoltaic power stations, people pay more and more attention to the operation and maintenance of photovoltaic power stations. However, it is difficult to diagnose string-level faults through changes in operating current and voltage and inspections by operation and maintenance personnel, which will affect the power generation revenue of the power station. Therefore, it is particularly important to accurately diagnose string-level faults. [0003] The existing string-level fault diagnosis methods at home and abroad can be mainly classified into two categories: one is that the operation and maintenance personnel use the thermal imager to make inspections. It takes a long time...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of high cost and low efficiency of the photovoltaic power plant string fault diagnosis method in the prior art, and provide a photovoltaic power plant string fault diagnosis method, device, equipment and readable storage medium

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