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Study on the Fault Diagnosis of Variable Frequency Speed Regulation Based on Fuzzy Neural Network

Author: LvJingXiu
Tutor: WangXin
School: Henan Polytechnic University
Course: Control Theory and Control Engineering
Keywords: Fault Diagnosis VVVF Fuzzy Neural Network BP algorithm
CLC: TM921.51
Type: Master's thesis
Year: 2009
Downloads: 81
Quote: 3
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Abstract


In this paper, the complex structure of the Frequency Control System fault symptoms and causes widespread vagueness and complexity of the problem , combined with the characteristics of fuzzy systems and neural networks , the use of the frequency control system fault diagnosis method based on fuzzy neural network and to verify the feasibility of the method . This paper analyzes the characteristics of fuzzy systems and neural networks , the fuzzy system is the lack of self-learning ability , the selection of membership functions and fuzzy rules with no clear physical between the input and the output of certain subjective and depends on the experts, as well as neural networks the significance of such issues , the fuzzy systems and neural networks composed of fuzzy neural network , the traditional BP algorithm based on a proposed increase in momentum term , adaptive learning rate adjustment improved BP algorithm . Study the failure mechanism of the frequency control system , the characteristics of the output signal of the frequency control system with a combination of Fourier transform and wavelet analysis method , its analysis and feature extraction . The inverter output current of the absolute value of skewness , kurtosis and root mean square as the input of the neural network fault diagnosis . Fault diagnosis of motor vibration band energy and voltage , current , vibration deviation as the input of the neural network , and troubleshoot . Diagnostic results show that , compared with the commonly used method of fault diagnosis , fault diagnosis method based on fuzzy neural network can compensate for fuzzy systems and neural networks alone insufficient to have a higher accuracy rate and , based on current , voltage , vibration deviation comprehensive fault diagnosis based solely on the vibration band energy error . Therefore, this method in the frequency control system fault diagnosis , may well be a good diagnostic method .

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric drive ( electric drive ) > Control system > Variable frequency control system
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