A Novel Neutral Point Voltage Control Strategy for Three-Level NPC APF Based on SVPWM
College of Electrical Engineering, Shanghai Dianji University, Shanghai, China
* Corresponding author: email@example.com
The unbalance of the neutral point voltage is an inherent problem of three-level neutral-point-clamped (NPC) Active Power Filter (APF); this paper analyzes the causes of unbalanced neutral point voltage and studies the reason of the unbalance of the neutral point voltage. A novel neutral point voltage control strategy using Space Vector Pulse Width Modulation (SVPWM) is proposed. The proposed strategy is based on the traditional SVPWM, by controlling the effect time of small vector, which can change the state of the midpoint voltage fluctuation, and the neutral point voltage can be maintained balance. The influence of the vector on neutral point balance is investigated in depth. Simulation results show the neutral point voltage balancing control strategy based on SPWM is effective.
Key words: three-level APF / neutral point voltage balance strategy / SVPWM
© Owned by the authors, published by EDP Sciences, 2015
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