| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系碩士班 === 91 === This thesis presents a Petri Net(PN) model to deal with the main-transformer installation planning for MRT power systems according to the MRT load growth of year. The proposed model is divided into three phases: selection of the loading of year, the determination of supplying transformers, and the determination of the backup transformer. To improve the operation reliability, the extra capacity of ten percent of the current loading and one extra unit of main-transformer are considered in the planning. Also, two installation schemes- disperse scheme and centralize scheme are proposed in this thesis to minimize the switching operation in case of contingencies.
By the proposed PN inference network, the time of year, the number of transformer units, and the bulk supply substations to install the main transformers are determined simultaneously. Computer simulations coded by object-oriented language C++ are implemented for the Taipei MRT power system involving twelve substations. The simulation results are verified by load flow analysis for normal cases and some contingencies.
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