Control of a Multiport Converter for Independent MPPT Algorithms and Grid Integration in Photovoltaic Applications
Year: 2025
Type: article
Abstract: The advantage of multiport dc-dc converters over a configuration of several two-port dc-dc converters with a common dc bus is the reduction in the number of components. However, certain multiport dc-dc converter topologies still present significant challenges, such as cross-coupling. This article introduces a two-stage system composed of a dual-input single-output dc-dc converter for dual MPPT, linked with a single-phase full-bridge inverter for grid integration. The mathematical model and digital control strategy based on state variable feedback and decoupler are presented to regulate the voltages of the photovoltaic modules. The results show a maximum deviation of voltagevpv1of 2.47% when there are variations of 6 V in the reference voltage invpv2and a maximum deviation of voltagevpv2of 6.7% when there are variations of 4 V in the reference voltage invpv1. These outstanding results enable independent and flexible MPPT algorithms to operate stably under different environmental conditions. With respect to the experimental results, they show that the proposal can operate independent MPPT algorithms between two PV modules with reduced cross-coupling, and it is also possible to regulate the dc-link voltage and the grid current under different conditions.
Source: IEEE Access
Institutions: University of Talca, University of Nottingham
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,075
OpenAlex ID: W4415707466