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Zero-Sequence Current Reduction Method of Dual Inverter with a Common DC-Link for High-Speed Applications

This paper studies a power converter of high-efficiency electric pump systems for aerospace applications. The control method of dual inverter with common dc-link is proposed for driving the electric pump at high speeds using a battery. The dual inverter with common dc-link exhibits higher voltage utilization and better fault tolerance than the general-purpose three-phase voltage source inverter. However, the system efficiency decreases because of the increase in the zero-sequence current when the motor is driven at high speeds. The proposed method reduces the current through coordinate transformation, even at high-speed drives. The simulation results show that the proposed method reduces the 3rd electric angular frequency component of the motor current to approximately 0 A at 18000 r/min. The experimental results show that the proposed method reduces the current to approximately 0 A at all motor speeds.