Modeling and Simulation of a Double-Stage Single-Phase Grid-Connected PV System

Channareth Srun; Phok Chrin; Sokchea Am; Bunthern Kim

doi:10.25042/epi-ije.022022.03

Channareth Srun Mechatronics and Information Technology, Institute of Technology of Cambodia. Russian Federation Blvd, P.O. Box 86, Phnom Penh Cambodia
Phok Chrin Energy Technology and Management, Institute of Technology of Cambodia. Russian Federation Blvd, P.O. Box 86, Phnom Penh Cambodia
Sokchea Am Energy Technology and Management, Institute of Technology of Cambodia. Russian Federation Blvd, P.O. Box 86, Phnom Penh Cambodia
Bunthern Kim Energy Technology and Management, Institute of Technology of Cambodia. Russian Federation Blvd, P.O. Box 86, Phnom Penh Cambodia

DOI: https://doi.org/10.25042/epi-ije.022022.03

Keywords: Double-stage, Grid tie, MPPT, P&O algorithm, PV system

Abstract

This paper presents the design model and simulation of a double-stage single-phase grid-connected PV system. This system includes an MPPT DC-DC boost power converter and a transformer-less single-phase DC-AC power inverter, which is connected to the power grid with an LCL filter. In the DC-DC boost converter, the Perturb and Observe algorithms are combined. The output voltage of the DC-DC converter is regulated, and the DC/AC output voltage is synchronized with the grid. The MATLAB-Simulink environment is used for the closed-loop simulation of the proposed setup. The simulation results are presented for various solar irradiance conditions and show that photovoltaic current is generated and matches the phase of grid voltage.