A tolerance band (hysteresis) current controller is presented that provides phase decoupling control of a three-level, three-phase rectifier and allows the utilization of the full modulation range. The novel current control method provides coordinated switching between the phases and results in a near constant switching frequency and a current ripple performance that is similar to conventional carrier-based PWM controllers. Theoretical analysis of the control method is presented and the performance of the phase decoupling is experimental verified using a 5kW Vienna rectifier.
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