Dissertation > Excellent graduate degree dissertation topics show

Research on Transmission Line Fault Location Based on Power Frequency Quality

Author: GaoZhenYa
Tutor: LianYingZhan
School: Guangdong University of Technology
Course: Proceedings of the
Keywords: Transmission lines Fault Location Asynchronous data
CLC: TM762.25
Type: Master's thesis
Year: 2011
Downloads: 70
Quote: 0
Read: Download Dissertation

Abstract

The failure of high-voltage transmission lines, find the source of the fault can be timely and accurate, is not only able to quickly repair the line, and exclude insulation hazards, ensure reliable power supply, and has important implications for the security and economic operation of the entire power system. The paper discusses in detail the basic principles and after a fault line based line fault location on power frequency decoupling theory, given a uniform transmission line equation and line-based distributed parameter model, focusing on the line ranging filtering algorithm based line ranging algorithm for distributed parameter model; derived ranging equation based on a single-side and double-side data, simulation studies, simulation ranging effects for the study of the new high-voltage transmission line fault location algorithm laid a theoretical basis. Transmission lines, the filtering effect is good or bad is a direct impact on the accuracy of line ranging from failure after transient waveform accurately extract the fundamental component is based on the key to power frequency ranging. Lists four improved full-wave Fourier filtering algorithm, simulation comparison of their filtering performance, summarizes the various filter characteristics of the algorithm and the existing problems, pointed out that the improved algorithm phase angle compensation principle for the Ranging programs choose appropriate filtering algorithm. Based on the the contralateral system impedance and the impact of the transition resistance ranging algorithm for single-ended data can not be eliminated principle, which limits the scope of its application. Ranging algorithm based on the double-end data in principle be able to completely overcome the impact of the above factors ranging results. With the development and progress of communication technology, ranging algorithm based on the double-end data for field line ranging conditions. Distributed parameter model of the line equivalent model is more accurate, but the use of this model after the ranging equation is nonlinear. Newton iterative method is a classical method for solving nonlinear equations, but there are computationally intensive, iterative initial requirements shortcomings. This article intends to introduction of Newton's method for solving nonlinear equations, using recursive method to strike a simplified alternative Jacobian matrix matrix, greatly reducing the amount of computation, but also to ensure the characteristics of the algorithm superlinear convergence. Does not require data synchronization, allowing the line parameters can change the double-ended ranging algorithm has practical value. Fault distance, both ends of the data is not synchronized angle and line parameters as an unknown quantity, with quasi-Newton method ranging equation iterative solution, a large number of simulation results show that the proposed ranging from transition resistance, fault The types of effects, both within the scope of the full line has a high ranging accuracy, verify the validity of the ranging program.

Related Dissertations

CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatic control of electrical equipment > Automatic reclosing > Test adjustment and maintenance
© 2012 www.DissertationTopic.Net Mobile