Research On Traction System For A Permanent Magnet Maglev Vehicle

Congestion of public transportation has always being an intractable problem especially in metropolises of China as it has the largest population.The primary shortcoming of automobile,which has always being the significant means of road transport, is its severe tail gas contamination. Electric vehicle has been considered as an ideal solution to environmental pollution but it is battery that hinders the popularization of electric vehicle. So far, there is no battery with all the advantages of high specific energy, high specific power, long cycle life, lower prices, security and pollution-free. In addition, another inevitable problem is traffic jam. No matter how wide the highroads are, how fast the highways are constructed, it is still riot sufficient for the rapidly increasing speed of China's automobiles steering on roads for the moment.The advantages of permanent magnet maglev vehicle include lower capital cost estimate, high-speed & reliable operation, reduced environmental impact, excellent ride quality, lower energy consumption, reduced noise etc. It is the advantages that make permanent magnet maglev vehicle become one of the preferred solution to urban public transportation. Travel time of passengers can be guaranteed and there is no traffic jam because permanent magnet maglev vehicle operating at the speed of 160km/h operates on elevated guideway.As one of the key technologies of permanent magnet maglev vehicle, traction system implements power distribution and control that vehicle operation needs. The research content of this dissertation is the preliminary exploration of traction technique of permanent magnet maglev vehicle. First of all, the author compares Germany's maglev TR08 and Japan's maglev MLX01 with permanent magnet maglev vehicle in the aspects such as suspension mechanism, capital cost estimate, maximum speed, acceleration, power consumption, capacity etc and consequently determines the scope of application of permanent magnent maglev vehicle. And then the author constitutes propulsion strategy according to the operation characteristic of permanent magnet maglev vehicle. At the same time, the author also determines the configuration of propulsion and power supply system, the length of stator section, feeding strategy of multiple stator section and operation strategy of multiple vehicles etc. The power rating of traction system is calculated according to the requirements on the propulsion system. Subsequently, permanent magnet maglev vehicle traction system composed of 30 degree phase-shifting dual series connection thyristor rectifier and IEGT inverter is designed. In this dissertation, power semiconductor devices are also selected on the basis of the capacity of traction system. Besides the designed rectifier is analyzed and IEGT and its gate driver unit circuit are also introduced. Finally, simulation work is done on the basis of constituted simulation model of traction system of permanent magnet maglev vehicle. The simulation results prove that designed traction system meets the requirements on operation of permanent magnet maglev vehicle.