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Research on EHV Transmission Line Transient-based Protection Scheme Based on Prony Algorithm

Author: YangYuKun
Tutor: YangMingYu
School: North China Electric Power University
Course: Proceedings of the
Keywords: EHV transmission lines Backward prediction Prony algorithm Transient Protection Fault phase selection
CLC: TM773
Type: Master's thesis
Year: 2011
Downloads: 74
Quote: 1
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Abstract

Transient Protection for improving the performance of the existing protection is of great significance. This paper presents a protection scheme based fault after transient current signal. Firstly, the algorithms are derived in detail the composition of the current transient signal distribution parameters under various fault types of EHV transmission lines, the analysis showed that the failure after the transient signal contains high frequency components of harmonic forms. Further theoretical analysis shows that the amplitude and frequency characteristics of the high-frequency transient component can reliably distinguish between the various fault types. Defined herein amplitude high-frequency transient component of the dominant harmonic frequency; theoretical analysis showed that the frequency and phase values ??of the dominant harmonic frequency \\This paper summarizes Prony algorithm based on the algorithm computing efficiency and reliability, has been improved. Backward linear prediction technology, improved algorithm has higher anti-noise performance, and solve the problem of the conventional Prony algorithm is difficult to extract the true frequency components. Calculated by using QR decomposition algorithm to improve the Prony algorithm greatly shorten the time-consuming than the traditional algorithms. After use in order to extract the true frequency components more reliable, to linear prediction technique based on the proposed method based energy. This article integrated aspects given the complete algorithm improvement program. To Prony algorithm is more suitable for this topic, the article also made a detailed analysis of the parameter selection summarizes Prony algorithm. The Prony algorithm EHV transmission line fault phase selection programs and protection programs, and power lines Luke with a series capacitor and shunt reactors, lightning interference occurs reliability of the protection program analysis. Characteristics of transmission lines, lightning interference analysis, and proposed identification scheme based on the the Prony algorithm lightning interference. This article uses the ATP simulation software to simulate the various fault conditions, the simulation results show that the protection scheme able to quickly and accurately partition, external fault, and the fault type, without transition resistance and of failure early phase angle fault conditions and the lightning interference impact, as well as the impact of the additional transient signal due to the installation of series capacitors, shunt reactors.

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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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