Abstract
There are a large number of capacitors in power electronic transformer (PET). If PET is started by conventional closed-loop control directly to establish DC capacitor voltage, the over-current that may lead to device damage may be caused. To solve this problem, a soft start strategy of PET based on energy feedback is proposed. In this strategy, the DC capacity of the low voltage side is moderately overcharged at first, and then part of the energy is fed back to the high voltage side to make the voltage of the high voltage DC side reach the reference value. Finally, the CHB is allowed to enter the closed-loop control, thus completely eliminating the impulse current of the AC side. This method avoids the complex parameter design process, and completely relies on the theoretical model rather than experience to guide the design of the process of soft start. Simulation results verify the feasibility and effectiveness of the proposed method.
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