Voltage-drop and Short-circuit Analysis of a 2x25kV High-speed Railway System
| Autor: | Yen-Feng Hsu, 許炎豐 |
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| Rok vydání: | 1999 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 88 The main purpose of this dissertation is to develop the analytic tools for rigorous evaluation of voltage regulation and short circuit analysis of a 2’25kV AT-fed electric network. The models of system components significantly affect the accuracy of simulation results and the convergence characteristics of solution techniques. First of all, a detailed network model of a 2*25kV electric railway network was developed. The model is composed of a substation model, autotransformer (AT) models, and network conductor models. The AT model considers the impedance and inherent characteristics of the AT while it was considered as an ideal transformer in other studies. The network conductor model considers the self and mutual impedances of the three major conductors (overhead contact wire, negative feeder and rails). These models are all in coupling-free type. Therefore they can be easily implemented into a program developed by oneself or commercial packages such as the Electromagnetic Transients Program (EMTP) or the Personal Computer Simulation Program with Integrated-Circuit Emphasis (PSPICE). Second, programs for sequential train voltage calculation and short-circuit analysis were developed with the proposed network model of a 2*25kV electric railway network. The sequential train voltage calculation program can simulate the multi-trains'' operations with load models of constant current or constant power. It can also perform on-line simulation when a sequential train load forecasting program is incorporated. The sequential short-circuit analysis program can be used to quickly scan the short-circuit characteristic of whole electric railway network. The results are of value to the selection and setting of protection relays and selection of system equipment with suitable short-circuit capacity. Finally, by the basic principle of the short-circuit analysis algorithm for the high-speed railway traction systems, a fault location algorithm was developed to locate the fault position. The algorithm is robust under any fault impedance. Time and costs required for locating any type of fault and subsequent service restoration can be considerably reduced using the proposed algorithm instead of the conventional method of crew inspection. A series of case studies have demonstrated the feasibility and reliability of the proposed network model and programs. The research results are of value to related engineers to aid plan, design and operate a 2x25kV electric traction network. A high quality and reliable high-speed railway system can thus be achieved. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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