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A Simple Control Strategy for Balancing the DC-link Voltage of Neutral-Point-Clamped Inverter at Low Modulation Index  

C.S. Ma (Dept. of Electrical Engineering, Hanyang University)
Kim, T.J. (Dept. of Electrical Engineering, Hanyang University)
D.W. Kang (Dept. of Electrical Engineering, Hanyang University)
D.S. Hyun (Dept. of Electrical Engineering, Hanyang University)
Publication Information
Journal of Power Electronics / v.3, no.4, 2003 , pp. 205-214 More about this Journal
Abstract
This paper proposes a simple control strategy based on the discontinuous PWM (DPWM) to balance the DC-link voltage of three-level neutral-point-clamped (NPC) inverter at low modulation index. It introduces new DPWM methods in multi-level inverter and one of them is used for balancing the DC-link voltage. The current flowing in the neutral point of the DC-link causes the fluctuation of the DC-link voltage of the NPC inverter. The proposed DPWM method changes the path and duration time of the neutral point current, which makes the overall fluctuation of the DC-link voltage zero during a sampling time of the reference voltage vector. Therefore, by using the proposed strategy, the voltage of the DC-link can be balanced fairly well and the voltage ripple of the DC-link is also reduced significantly. Moreover, comparing with conventional methods which have to perform the complicated calculation, the proposed strategy is very simple. The validity of the proposed DPWM method is verified by the experiment.
Keywords
Neutral-Point-Clamped (NPC) inverter; DC-link voltage balancing; the neutral point current; discontinuous PWM (DPWM);
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