Method for evaluating state of full-power power generation system frequency converter IGBT

Abstract

The invention provides a state evaluation method for a frequency converter IGBT of a full-power power generation system. The state evaluation method comprises the following steps: step 1, acquiring 13types of waveform signals; step 2, decomposing the 13 types of waveform signals obtained in the step 1 to obtain feature information for judging faults; step 3, constructing the feature information for judging the fault obtained in the step 2 by utilizing a wavelet decomposition coefficient to obtain a feature vector; 4, extracting feature values from the feature vectors obtained in the step 3; step 5, constructing a BP neural network; step 6, optimizing the obtained BP neural network; step 7, training the BP neural network optimized in the step 6 to obtain a trained optimized BP neural network; and step 8, substituting the optimized BP neural network trained in the step 7 into actual operation data for verification, and evaluating whether the IGBT of the frequency converter is in an opencircuit state or not in real time; according to the method, the optimal configuration problem existing in the current offshore wind power overhaul work is solved, and the economy, the stability and the maintainability are improved.

Description

Technical field[0001]The invention relates to the technical field of inverter state evaluation of offshore wind turbines, and in particular to a method for evaluating the state of inverter IGBTs of a full-power power generation system.Background technique[0002]Inverter is an important electrical equipment in large-capacity offshore wind turbines. It is one of the core energy conversion equipment in wind turbines. It is responsible for the task of converting electrical energy that fluctuates in frequency with the wind speed into electrical energy with stable frequency. One of the high equipment. At present, the mainstream offshore wind turbines are all full-power variable-speed constant-frequency (VSCF) power generation systems. Among them, the squirrel cage asynchronous power generation system with high-speed gearbox + squirrel cage asynchronous generator + full power inverter as the technical route is more common. On the one hand, with the rapid development of my country’s offshore...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating the state of the IGBT of the frequency converter of the full-power power generation system, which solves the defect that the state of the IGBT of the frequency converter of the full-power power generation system has not yet been evaluated in the prior art, resulting in poor reliability of the overall system

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