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A Digital Predictive Current Control With Improved Sampled Inductor Current for Cascaded Inverters

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3 Author(s)
Chih-Chiang Hua ; Dept. of Electr. Eng., Nat. Yunlin Univ. of Sci. & Technol., Douliou ; Chun-Wei Wu ; Chih-Wei Chuang

This paper proposes a current-control technique with a predictive control method for multilevel inverters. The proposed current-control method adopts a variable sampling point scheme for inductor current sensing. It is able to avoid the switching noise caused by the turn-on or turn-off of power devices. The measured value of the inductor current is used to estimate the inverter output voltage at the next switching period with a simple linear extrapolation to force the output current to follow the current reference. Compared to the conventional predictive current controllers, the proposed control features are as follows: (1) only the inductor current measurement is required, and it is able to achieve a cost-effective and less-complex circuit (the output voltage and current measurements are required for a conventional controller) and (2) the proposed variable sampling technique is designed to avoid the switching noise, thus a robust current-control system can be achieved. Finally, a seven-level cascaded inverter with three DC-AC converter modules was constructed and tested. Analysis, simulations, and experimental results are presented to demonstrate the superiority of the proposed system.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:56 ,  Issue: 5 )