A Single Stage Solid State Transformer for PWM AC Drive with Source based Commutation of Leakage Energy - 2015
A solid-state transformer could be a 3-phase ac/ac converter with a high-frequency transformer. Because of advanced features like high power density, on demand var support and frequency regulation, solid-state transformer is an enabling technology for the modern power distribution system. It will also find application in high-power-density motor drives. The only-stage solid-state transformer thought-about in this paper is capable of bidirectional power flow and open loop power issue correction. This topology uses a minimum amount of copper and has relatively few semiconductor switches. One major problem in this converter is the commutation of leakage energy that results in power loss, reduction in switching frequency, loss of output voltage, and additional common-mode voltage switching. This paper presents a supply-based mostly commutation strategy along with a completely unique modulation technique resulting in elimination of further snubber circuits, minimization of the frequency of leakage inductance commutation, recovery of the leakage energy, and soft switching of the output converter. The topology and its proposed control have been analyzed. Simulation and experimental results make sure the operation.
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