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In this paper, a novel arc-suppression coil based on transformer theory is proposed. According to this theory, the reactance of the arc-suppression coil can be controlled exactly by controlling the current of secondary winding of the reactor, which is implemented by a single phase inverter. This fire-new arc-suppression coil has some excellent characteristics such as linear regulation capacity and few harmonics pollution. Another feature is that the capacitance of power network can be detected real time, which makes automatic tuning of the arc-suppression coil available. These features make this type arc-suppression coil competitive comparing with others in industrial applications. An apparatus is built up in terms of the theory and its structure will be introduced in the paper. In the last section, the experimental results are presented to prove the feasible of the theory and the validity of control system.

A power electronic transformer (PET) is applied to the high-speed train for lightweight demand. A 300 kW/5 kHz high-power medium-frequency transformer (HPMFT) using hollow conductors in a power unit of the PET is optimally designed in this paper. The target of the design is to balance the loss, leakage inductance, and weight of the HPMFT. For this purpose, the design parameters of the HPMFT are firstly confirmed according to the system structure and parameters of the PET. Secondly, the design process of HPMFT is developed. Finally, the results of 48 design schemes of core-type and shell-type structures are compared by the comprehensive evaluation standard, which equilibrates the three above objective parameters of the HPMFT. According to the optimal scheme, a prototype is manufactured, whose test results verify the correctness of the optimal design method.

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