Improved Finite-Control-Set Model Predictive Control for Cascaded H-Bridge Inverters

Roh Chan and Sangshin Kwak
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Roh Chan: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea
Sangshin Kwak: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea

Energies, 2018, vol. 11, issue 2, 1-27

Abstract: In multilevel cascaded H-bridge (CHB) inverters, the number of voltage vectors generated by the inverter quickly increases with increasing voltage level. However, because the sampling period is short, it is difficult to consider all the vectors as the voltage level increases. This paper proposes a model predictive control algorithm with reduced computational complexity and fast dynamic response for CHB inverters. The proposed method presents a robust approach to interpret a next step as a steady or transient state by comparing an optimal voltage vector at a present step and a reference voltage vector at the next step. During steady state, only an optimal vector at a present step and its adjacent vectors are considered as a candidate-vector subset. On the other hand, this paper defines a new candidate vector subset for the transient state, which consists of more vectors than those in the subset used for the steady state for fast dynamic speed; however, the vectors are less than all the possible vectors generated by the CHB inverter, for calculation simplicity. In conclusion, the proposed method can reduce the computational complexity without significantly deteriorating the dynamic responses.

Keywords: model predictive control; dynamics; multilevel inverter; cascaded H-bridge (CHB) inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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