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The three-level inverter has several advantages of large capacity, large voltage and low current waveform distortion. However, there is an important problem of neutral point potential variation in three-level inverter. The variation causes an unbalance in the DC link voltage levels and current waveform distortion. In this paper, we propose a new method to control the neutral point potential. The neutral point potential in three-level inverter is analyzed by state variable. The proposed method uses the estimated value of the neutral point potential, which is calculated by motor currents. The proposed method can be applied at various speeds and regenerating operation. The validity of the proposed method is proved by experimental results and simulation.

Compensation for Neutral Point Potential in Three Level Inverter by using Motor Currents of Permanent Magnet Synchronous Motor and its Characteristics