| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 90 === Modern Light Rail Transit Systems (LRT) are supplied with electrical energy, therefore they stand for a modern, safe, fast and non-pollutive transportation system. As transportation solutions, they fill the gap between transportation by buses with their relatively low capacities and the transportation by Mass Rapid Transit Systems (MRT) with high capacities. They serve as feeders to MRT, High Speed Railroad (HSR) and conventional railway such as Taiwan Railway Authority Systems (TRA) or as transversal or circular connections of existing radial lines. Nowadays, they will play an important role on transportation.
There are many types of DC power supply voltages for LRT around the world, for example, 600V, 650V, 700V, 750V, 1000V, 1200V and 1500V etc. The standard voltages are 600VDC, 750VDC and 1500VDC by International Electrotechnical Commission (IEC850). Different value of power supply voltages will have different construction costs, operational costs, planning and design flexibility etc. The purpose of this thesis is to investigate the characteristics and differences between 750VDC and 1500VDC. The light rail vehicle (LRV) data use LRV Taiwan no.1. Overhead catenary systems (OCS) use German standards. General design guidelines for dc power supply use international standards. Assuming a circular network, dc power flow simulation is executed to analyze voltage fluctuation of LRV and the variation of traction substation loading when power supply voltages are 750V and 1500V. In view of safety and reliability, this thesis suggests ideal arrangements including minimum numbers, most appropriate capacity and the best sites for traction substations.
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