Effect Analysis of Cogenerators Paralled with a Distribution System
| Autor: | Ren-Tzer Wang, 王仁澤 |
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| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 Deregulation of the power industry is a tendency in the world. It is unavoidable that for Taiwan has to face the power revolution. Taiwan power company suffers from difficulties in establishing new generation plant and expanding transmission line recently. The deregulation of power industry will certainly lead to installations of more and more dispersed generation all over the power system. Dispersed generation operates in parallel with the system and impacts it. These dispersed generations may be solar power, wind power, micro-turbines, fuel-cell, small-scale gas turbines, diesel engines, and cogeneration units. According as fuel prices, energy supply, infrastructures, market niche, associated regulatory rules etc. Taiwan to develop cogeneration will be more potential. In this thesis the commercial simulation software, Pspice, was employed to simulate and analyze the effects of cogenerators operated on uniformly distributed loads and non-uniformly distributed loads in a three-phase four-wire distribution system under different operation conditions. First of all, the equivalent models of distribution system major components such as transformers, co-generation units, and loads were derived. Then the network model of a three-phase four-wire distribution system was constructed. Secondly, with and without cogenerators operated in parallel with uniformly distributed loads in a distribution system are simulated. We varied cogeneration capacity and explored analysis of the role for power supply between the utility substation and cogeneration plant by using power flow studies. We find the cogeneration capacity to gain the minimum feeder power loss. We simulate a balanced three-phase short-circuit fault occurred between the utility substation and paralleled cogeneration plant, and find the effects of the capacity variation of cogeneration plant on the magnitude and distribution of short-circuit current of a distribution system. Thirdly, cogeneration unit operated in parallel with a non-uniformly distributed load in different positions of a distribution system is investigated. After a series of simulation and analysis, considering voltage variation rate and current unbalance rate, we try to find the cogeneration proper position where the cogeneration will be paralleled with the feeder. Finally, we propose several effective methods to improve three-phase current unbalance which is caused by the cogeneration and unbalanced loads paralleled with a distribution system for the people working for the utility . |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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