Keywords: DC 3 kV, medium-low-speed maglev, positive rail voltage loss, positive rail currents, substation, train speed, braking.

The DC (direct-current) 750V or DC 1500V power supply systems is currently adopted for the medium-low-speed (MLS) maglev, achieving a maximum train operational speed of 140 km/h. There are plans to increase this speed to between 160~200 km/h, however, it will result in higher energy consumption and higher positive rail (PR) voltage losses. To address these challenges, the increase of the power supply voltage to DC 3 kV is considered. This increase would enhance the power supply capacity, reduce the required PR current and decrease the number of necessary substations, allow for thinner PR rails and lower economic costs. Taking the Xinzhu Maglev Line in Chinese Chengdu, as a case study, this paper constructs a MLS maglev power supply system model. Considering different train running states of accelerating, coasting and braking, this paper conducts a comparative analysis of PR voltage losses and PR currents across DC 0.75 kV, DC 1.5 kV, and DC 3 kV systems when the train speed is increased to 160~200 km/h. Then, design distances between adjacent substations of three power supply voltage levels are compared, and train braking intensity is considered to analyze the influence patterns of power supply voltage levels on the braking over-voltages.

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