Model Predictive Control for Three-Phase, Four-Leg Dynamic Voltage Restorer

Decan Liu, Huaying Zhang, Xiaorui Liang () and Shicong Deng
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Decan Liu: College of Electrical Engineering, Sichuan University, Chengdu 610017, China
Huaying Zhang: China Southern Power Grid, Guangzhou 510663, China
Xiaorui Liang: China Southern Power Grid, Guangzhou 510663, China
Shicong Deng: China Southern Power Grid, Guangzhou 510663, China

Energies, 2024, vol. 17, issue 22, 1-19

Abstract: Dynamic voltage restores (DVRs) are usually used to mitigate the effect of voltage sag and guarantee sufficient power supply for sensitive loads. However, three-phase voltage cannot be compensated to the desired balance voltage under unbalanced three-phase loads by traditional DVRs with a three-phase, three-leg inverter. To address this problem, a three-phase, four-leg inverter-based DVR is first introduced in this paper, and then the state space model in its continuous form and discrete form are established, respectively. A two-step predictive method is proposed for the prediction of the output voltage in each switching state by the established voltage prediction model. Finite-control-set model predictive control (MPC) is developed to be used in the three-phase, four-leg inverter-based DVR. Its dynamic response is effectively improved by the proposed MPC method under various voltage sag conditions. The proposed DVR control strategy is validated via MATLAB/Simulink-R2022b simulations, which demonstrate its effectiveness in voltage compensation under various sag conditions.

Keywords: DVR; three-phase, four-leg inverter; SOGI; FCS-MPC (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: 2024
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