Multi-fault feature extraction method and device for photovoltaic grid-connected inverter

Abstract

The invention provides a photovoltaic grid-connected inverter multi-fault feature extraction method and device, and belongs to the technical field of photovoltaic power generation. The method comprises the following steps: setting a photovoltaic grid-connected inverter circuit topological structure; dC side voltage stability and unit power factor grid connection are realized by adopting double closed-loop control; analyzing the fault mode of the photovoltaic grid-connected inverter; performing feature extraction by adopting wavelet packet fuzzy entropy to obtain a fuzzy entropy feature value; and performing dimension reduction processing on the fuzzy entropy feature value by adopting principal component analysis to obtain fault feature data. The invention provides a method for processing open-circuit faults of a photovoltaic grid-connected inverter and a method for extracting fault features, and provides a new thought for diagnosing and processing fault data of the grid-connected inverter of a photovoltaic power station. Compared with a wavelet packet entropy method and a wavelet packet sample entropy method, the method for extracting the fault characteristic value through the wavelet packet fuzzy entropy method has the advantage that the thought of a threshold value and fuzzy is added.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a method and device for extracting multiple fault features of a photovoltaic grid-connected inverter. Background technique [0002] At present, my country's social and economic levels are constantly improving, and people's demand for electricity is gradually increasing. Therefore, the rapid energy consumption and energy shortage brought by fossil energy are gradually becoming serious. New energy, as an emerging energy reserve in recent years, has attracted the attention of all walks of life. Among them, photovoltaic power generation has unique advantages. Therefore, the photovoltaic power generation industry is the fastest growing new energy industry in the world in recent years. Photovoltaic power generation plays an important role in energy conservation, environmental protection, Full utilization of resources and other aspects are of great sign...

AI Technical Summary

Problems solved by technology

However, in the actual photovoltaic power station, the equipment in the power generation system has always been in a harsh natural environment, and the inside of the equipment has been subjected to high electrical and thermal stress, and the long-term high temperature and high-intensity working conditions of the system equipment have caused Increased failure rate of photovoltaic systems by studying possible failures of existing photovoltaic inverters

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