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http://dx.doi.org/10.5370/JEET.2017.12.6.2227

Research on the Mechanism of Neutral-point Voltage Fluctuation and Capacitor Voltage Balancing Control Strategy of Three-phase Three-level T-type Inverter  

Yan, Gangui (School of Electrical Engineering, Northeast Electric Power University)
Duan, Shuangming (School of Electrical Engineering, Northeast Electric Power University)
Zhao, Shujian (School of Electrical Engineering, Northeast Electric Power University)
Li, Gen (Cardiff University)
Wu, Wei (School of Electrical Engineering, Northeast Electric Power University)
Li, Hongbo (School of Electrical Engineering, Northeast Electric Power University)
Publication Information
Journal of Electrical Engineering and Technology / v.12, no.6, 2017 , pp. 2227-2236 More about this Journal
Abstract
In order to solve the neutral-point voltage fluctuation problem of three-phase three-level T-type inverters (TPTLTIs), the unbalance characteristics of capacitor voltages under different switching states and the mechanism of neutral-point voltage fluctuation are revealed. Based on the mathematical model of a TPTLTI, a feed-forward voltage balancing control strategy of DC-link capacitor voltages error is proposed. The strategy generates a DC bias voltage using a capacitor voltage loop with a proportional integral (PI) controller. The proposed strategy can suppress the neutral-point voltage fluctuation effectively and improve the quality of output currents. The correctness of the theoretical analysis is verified through simulations. An experimental prototype of a TPTLTI based on Digital Signal Processor (DSP) is built. The feasibility and effectiveness of the proposed strategy is verified through experiment. The results from simulations and experiment match very well.
Keywords
Fluctuation characteristics; Mechanism of neutral-point voltage fluctuation; T-type three-level inverter; Voltage difference feed-forward balancing control;
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Times Cited By KSCI : 3  (Citation Analysis)
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