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Study on the New Wide-Area Backup Protection for High Voltage Transmission Line

Author: ZhaoPu
Tutor: Wang
School: Southwest Jiaotong University
Course: Proceedings of the
Keywords: Wide - area protection Transmission line Intelligent Electronic Devices Power differential protection Simulation
CLC: TM773
Type: Master's thesis
Year: 2009
Downloads: 211
Quote: 0
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Abstract


China's own R \u0026 D, design and construction with independent intellectual property rights of 1000 kV AC Transmission System - southeastern Shanxi - Nanyang - Jingmen UHV experimental demonstration project successfully passed the 168-hour test run, and put into commercial operation. Around the \has become China's electric power system is currently facing a fundamental, critical and urgent problem. Traditional backup protection components generally do not consider the impact of the entire power grid, the only protection a central area of ??the grid. With the grid area increases and the load increases, this situation will deteriorate further. Traditional backup protection is mainly used to protect local equipment and ensure reliable fault clearing, but it may malfunction under heavy load conditions, and result in a cascade tripping of the network, this may lead to grid collapse. Wide-area protection system by collecting grid point information to achieve the removal of the fault more accurate and reliable, simultaneous analysis of security and stability after fault clearing, the use of appropriate means of control, to maintain the stability of the power system. In this paper, on the introduction of the background and research status of wide-area protection system, discusses the characteristics of wide-area protection and system architecture, describes the implementation of the transmission line WAN backup protection. The detailed analysis of the current widespread use of the principle of several high-voltage line protection, distance protection, current differential protection, the direction of the operating characteristics of the high-frequency protection and special problems are discussed in detail. On this basis, with the existing power communication conditions the operation of the power system wide area protection information protection the action coefficient and the correlation coefficient generation intelligent electronic devices (IED), WAN backup protection algorithm, examples show that The method can accurately determine the location of the fault, to overcome the lED refuse to move the case to extend the operation time the ADX line range shortcomings, to improve the safety and reliability of the power system operation. Based on the wide-area protection phasor measurement unit PMU adopted at both ends of the transmission line energy changes, according to the principle of power balance equation with real-time electrical quantities and discrete long transmission line fault criterion by line both ends of the active power compared to the end and exceeds the setting value is determined to have an internal fault. Combined with a 3 node 500 kV power network, the principle of the proposed simulation by MATLAB simulation software. As the application of the principles of the simulation of the power differential protection of wide-area protection has a certain significance.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system protection > Line Protection
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