Abstract
In order to solve the problem of DC capacitor voltage fluctuation during the operation of five level cascaded H bridge, a new DC capacitor voltage balance control method is proposed based on the analysis of the current control method. The superposition of active current to reference current of each phase can control the balance of three-phase voltage, and the superposition of the voltage whose phase is same as the active current but sign is contrary to the modulation wave of two H bridge unit respectively. Then the capacitor voltage on the DC side is almost maintained near the given value. The simulation results verify the effectiveness of the proposed method.
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