Modelling for Multiport Converter-Based Hybrid Power Supply using Renewable Energy Source Applications

Abstract

This study focuses on the design and modeling of a multiport converter-based hybrid power supply that uses solar PV to meet the needs of a small village. The village has a maximum power demand of 50 kW, serving twenty households. The first converter in the proposed multiport system is a high-frequency isolated DC-DC converter powered by an HVDC link, producing an output of 240 VDC. This converter employs a medium-frequency transformer with converters on both the primary and secondary sides, arranged in an input-series output-parallel (ISOP) configuration. Its output is connected to a solar PV and battery system through a buck-boost converter. The second converter is a three-phase modular inverter powered by the solar PV system, designed to supply an AC line voltage of 0.415 kV. The inverter is driven by a solar PV module with an open-circuit voltage of 85 V and a maximum power output of 415 W. To evaluate the system’s performance, scenarios involving changes in load and solar irradiance were analyzed. Performance was measured using indicators such as output voltage THD, current distortion, variations in converter output voltage, current magnitude, and overall efficiency. The system was modeled and simulated using the Simulink/PLECS (Piecewise Linear Electrical Circuit Simulation) platform. The simulation results indicate that the proposed multiport converter system serves as a promising alternative to the traditional low-frequency distribution transformer.

Keywords: DC-DC Converter, Hybrid Power Supply, MMC, Multiport Converter, Solar PV, Distribution Transformer