Multistep Model Predictive Control for Cascaded H-Bridge Inverters: Formulation and Analysis

Baidya, Roky; Aguilera, Ricardo P.; Acuna, Pablo; Vazquez, Sergio; Mouton, Hendrik du Toit

Abstract

In this paper, a suitable long prediction horizon (multistep) model predictive control (MPC) formulation for cascaded H-bridge inverters is proposed. The MPC is formulated to include the full steady-state system information in terms of output current and output voltage references. Generally, basic single-step predictive controllers only track the current references. As a distinctive feature, the proposed MPC also tracks the control input references, which in this case is designed to minimize the common-mode voltage (CMV). This allows the controller to address both output current and CMV targets in a single optimization. To reduce the computational effort introduced by a long prediction horizon implementation, the proposed MPC formulation is transformed into an equivalent optimization problem that can be solved by a fast sphere decoding algorithm. Moreover, the benefits of including the control input references in the proposed formulation are analyzed based on this equivalent optimization problem. This analysis is key to understand how the proposed MPC formulation can handle both control targets. Experimental results show that the proposal provides an improved steady-state performance in terms of current distortion, inverter voltages symmetry, and CMV.

Más información

Título según WOS: ID WOS:000412481100072 Not found in local WOS DB
Título de la Revista: IEEE TRANSACTIONS ON POWER ELECTRONICS
Volumen: 33
Número: 1
Editorial: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Fecha de publicación: 2018
Página de inicio: 876
Página final: 886
DOI:

10.1109/TPEL.2017.2670567

Notas: ISI