AUTHOR=Yang Pengcheng , Peng Yonggang , Xia Yanghong , Wei Wei , Yu Miao , Feng Qifan 

TITLE=A unified bus voltage regulation and MPPT control for multiple PV sources based on modified MPC in the DC microgrid

JOURNAL=Frontiers in Energy Research

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.1010425

DOI=10.3389/fenrg.2022.1010425

ISSN=2296-598X

ABSTRACT=<p>This study proposes a unified voltage regulation and maximum power point tracking (MPPT) method for photovoltaic (PV) sources in islanded direct current (DC) microgrids based on modified model predictive control (MPC). The method enables the PV sources to track the maximum power and serve as voltage sources for DC-bus voltage regulation when their available power is sufficient. Based on the proposed modified predictive model, the desired duty cycles can be calculated and directly applied to the PV sources in a constant switching frequency without a modulator. Real-time laboratory tests show that the PV sources can support the DC-bus voltage without energy storage (ES) and can proportionally share the load. Moreover, power oscillations and voltage ripples of the modified MPC get greatly attenuated compared with the traditional MPC under the same sampling frequency.</p>