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A Partial Energy Input Based Three-Port Cascade Multi-level Hexverter and Its Loop Current Control

Converter driven motors may cause energy accumulation in the DC-link capacitor of the converter when it is in the braking mode, and without a way to transmit this energy, this part of the energy will threaten the voltage balance. To reduce the impact as well as make use of the braking energy, a three-port cascaded multi-level hexverter (TCMH) based on partial energy input is proposed in this paper. Made up by six bridge arms of which only three have power inputs, it is able to drive two high power motors at the same time. By a loop current control also proposed in this paper, energy interaction exists among the six bridge arms. When the two motors are in asynchronous modes, the energy of the braking motor converter can be fed directly to the motoring mode motor, which solves the power balance problem as well as increases the power utilization rate. Finally, simulations are conducted to verify the effectiveness of the proposed hexverter and its loop current control.