Model predictive control of a microgrid with energy-stored quasi-Z-source cascaded H-bridge multilevel inverter and PV systems

• Published in: Applied energy Vol. 346; p. 121390
• Main Authors: Horrillo-Quintero, Pablo, García-Triviño, Pablo, Sarrias-Mena, Raúl, García-Vázquez, Carlos A., Fernández-Ramírez, Luis M.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.09.2023
• Subjects: Battery energy storage system; Energy management system; Microgrid; Model predictive control; Photovoltaic power plant; Quasi-Z-source cascaded H-bridge multilevel inverter; Model predictive control; Battery energy storage system; Microgrid; Photovoltaic power plant; Quasi-Z-source cascaded H-bridge multilevel inverter; Energy management system
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2023.121390

•Study of microgrid with energy-stored quasi-Z-source cascaded H-bridge multilevel inverter and PV system.•Development of energy management system based on model predictive control (MPC-EMS).•Results compared with proportional sharing algorithm based on SOC level (SOC-EMS).•Best results obtained from MPC-EMS. This paper presents a new energy management system (EMS) based on model predictive control (MPC) for a microgrid with solar photovoltaic (PV) power plants and a quasi-Z-source cascaded H-bridge multilevel inverter that integrates an energy storage system (ES-qZS-CHBMLI). The system comprises three modules, each with a PV power plant, quasi-impedance network, battery energy storage system (BESS), and voltage source inverter (VSI). Traditional EMS methods focus on distributing the power among the BESSs to balance their state of charge (SOC), operating in charging or discharging mode. The proposed MPC-EMS carries out a multi-objective control for an ES-qZS-CHBMLI topology, which allows an optimized BESS power distribution while meeting the system operator requirements. It prioritizes the charge of the BESS with the lowest SOC and the discharge of the BESS with the highest SOC. Thus, both modes can coexist simultaneously, while ensuring decoupled power control. The MPC-EMS proposed herein is compared with a proportional sharing algorithm based on SOC (SOC-EMS) that pursues the same objectives. The simulation results show an improvement in the control of the power delivered to the grid. The Integral Time Absolute Error, ITAE, achieved with the MPC-EMS for the active and reactive power is 20 % and 4 %, respectively, lower than that obtained with the SOC-EMS. A 1,3 % higher charge for the BESS with the lowest SOC is also registered. Furthermore, an experimental setup based on an OPAL RT-4510 unit and a dSPACE MicroLabBox prototyping unit is implemented to validate the simulation results.