基于RPROP神經網絡的輸電線路故障分析研究
[Abstract]:With the development of national economy and power network, more and more attention has been paid to the reliability of power supply. As an important part of power network, the reliability of transmission line operation directly affects the whole power network. Most of the transmission lines are directly exposed to the natural environment, so the transmission lines are also the most prone to failure in the power system. When the transmission line fails, the accurate identification of the fault phase will directly determine the correctness of the relay protection device. Based on this, a fault type recognition algorithm for transmission lines based on RPROP neural network and wavelet analysis theory is proposed in this paper. This paper mainly studies the feasibility and effectiveness of the fault diagnosis network based on RPROP neural network and wavelet analysis theory in transmission line fault diagnosis and relay protection, and improves the accuracy and rapidity of fault type identification. In this paper, the related theories of wavelet analysis and RPROP neural network are systematically described, including the research status of transmission line fault identification, the research status of neural network in power system and the development and application of wavelet transform. In this paper, the energy ratio of high frequency components of transient voltage based on wavelet transform is combined with RPROP neural network to identify the fault types of transmission lines. In this paper, the characteristics of each fault type of transmission line are analyzed, and the fault transient voltage is decomposed by wavelet transform according to its characteristics, and the coefficient energy ratio of each frequency band after the transient voltage is decomposed is calculated and extracted. Secondly, combined with the research content of this paper, a three-layer RPROP fault diagnosis network is constructed, that is, the input layer, the hidden layer and the output layer are each one layer. The ratio of frequency band coefficient energy of fault transient voltage extracted by wavelet analysis is used as the input of fault diagnosis network, and the output of the network is the four-bit binary coding corresponding to each short-circuit fault type. Finally, the fault data samples are used to train and test the network, and some fault samples are simulated and verified. According to the experimental results verified by simulation, the feasibility and effectiveness of RPROP network in transmission line fault diagnosis are determined. At the same time, the diagnosis results of RPROP network are compared with those of traditional BP network, and it is concluded that the diagnosis effect of RPROP network algorithm in transmission line fault diagnosis is better than that of traditional BP network algorithm.
【學位授予單位】:安徽理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM755
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