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Chaotic Carrier Wave Optimization and Traveling Wave MRA Based Transmission Fault Diagnosis

Author: XuQingShan
Tutor: TangGuoQing
School: Southeast University
Course: Proceedings of the
Keywords: Power system Fault diagnosis Chaotic carrier wave Multiple resolution analysis(MRA) Wavelet theory Mobile agent theory
CLC: TM711
Type: PhD thesis
Year: 2006
Downloads: 511
Quote: 1
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Abstract


Power consumers are requesting more on reliability, while the network fault is inevitable due to the reasons of operation, maintenance, insulation and et al. Fast fault diagnosis and elimination can enhance the speed of examine, repair and restoration, as well as operation stability and reliability, which leads to more national profits. Therefore, IEEE PES 2004 conference brings forward the concept of intelligent fault diagnosis definitely which makes out that optimal fault diagnosis system construction is an all-important work for dispatchers to judge fault section, fault types and fault location using all kinds of alarms and electrical parameters.This dissertation spreads the work from two aspects,“examination”and“judgment”of faults, which includes three main parts. Firstly, self-customized chaotic optimization arithmetic is put forward to seek fault section by protection or breaker information. Secondly, one novel modular criterion is provided to recognize the fault type compared with the traditional method. In the end, several countermeasures are presented according to the fault location. Detail work is summarized as the following.1. Regarding the fault section diagnosis as a kind of 0-1 integer programming problem, the dissertation fetches in the concept of chaotic optimization and firstly puts forward self-customized carrier wave mapping for consecutive variables to apply in this problem. The simulation results indicate that this method can overcome the limitations of traditional algorithms and can be easily to be on-line utilized.2. The fault waveform course is expatiated from the viewpoint of energy. The method of practical asymmetrical decoupling is prposed to eliminate the interactions between phases. Subsequently, it is also provided of the reflection and refraction of waveform at the node of fault point or buses, and equivalence transmission rule of multi-lines bus nodes.3. The multiple resolution analysis theory and the concept of average and detail are brought forward from the practical project level, which describes the low-frequency components and high-frequency ones of transient signals. The wavelet solution for transient analysis is also presented and wavelet function selection in some papers is suspected.4. After analyzing the promulgation law of interaction between different modular components and different phases, the modular criterion is provided to recognize the fault type based on Karenbauer transformation. The programming design diagram is also presented.5. It is firstly proposed to identify the close or remote segment with the promulgation time interval between aerial and ground module. The waveform surge after the first one from the fault point is cautiously judged whether reflection from fault point or refraction from opposite bus.6. Since the traditional decoupling method cannot eliminate the coupling between three phases completely in the case of unbalanced lines, the practical decoupling approach and practical modular velocity are firstly introduced, which makes the identification of surges more easily and enhances the precision of location.7. Via transcendental aerial modular velocity, the concept of waveform modular concave point is proposed to eliminate the influences of refractions from adjacent healthy lines, which prevents the mistakes of surge judgment by simple polarity. And considering the

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Network analysis,power system analysis
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