小電流接地系統(tǒng)故障選線與定位的研究
[Abstract]:With the rapid development of economy, electric energy, as a clean and environmentally friendly secondary energy, has changed our lives. In recent years, with the rapid development of the power industry, the power grid structure is complex and changeable, the installed capacity is increasing, and with the comprehensive completion of UHV transmission lines, transmission lines after failure, All kinds of industries will be affected to varying degrees. At present, the low current grounding mode is widely used in the distribution network of our country. When the grounding fault occurs in the system, the timely and accurate selection of the fault line is the key to the rapid recovery of power supply. In this paper, the characteristics of grounding fault in the system are analyzed, and the steady-state and transient characteristics are deeply studied. Firstly, the line selection methods based on steady and transient components, such as amplitude ratio phase method, fifth harmonic method, zero sequence admittance method, energy method and wavelet analysis method, are introduced in detail. Through simulation verification and summary of the applicable scope and limitations of each line selection method, it is concluded that the single line selection method has shortcomings. In view of the fact that a single line selection can not adapt to all kinds of single-phase grounding faults, a fusion line selection method based on limit learning machine is proposed in this paper. Firstly, the small current system model of 110/35kV is established in Matlab, and the feature components are extracted by wavelet packet transform algorithm. The zero sequence admittance method and adaptive notch method are used to analyze the transient characteristics of fault types in different grounding systems and different grounding resistance by improving the quintic harmonic method of phase-locked loop, and the limit learning machine method is used to fuse and select the line. It is compared with other fusion line selection methods. The voltage level of transmission network is getting higher and higher, and the transmission capacity is also increasing. After the fault of transmission line, finding the fault point in time can not only reduce the workload of operators, but also restore the power supply of the line in time. In this paper, based on the principle of single-terminal ranging, the voltage reverse traveling wave is realized by using the voltage reverse traveling wave, the small current system model is built in Matlab, and the voltage reverse traveling wave is obtained by using the three-layer decomposition of Hear wavelet. Through a large number of data, it can be verified that the method has high accuracy, calculates absolute error and relative error, and sums up the factors of error.
【學(xué)位授予單位】:太原科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM862
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