Renewable Energy Systems With Photovoltaic Power Generators: Operation and Modeling

TLDR

PV power generator installations have risen due to higher efficiency and improved manufacturing, and they are deployed in both grid‑connected and stand‑alone applications. The study provides an overview and focuses on the operation, modeling, and switching strategy of stand‑alone PV power systems. The authors analyze PV array‑inverter assemblies in slave‑and‑master modes, propose a switching strategy between diesel and PV, and evaluate them with a modular simulator. Simulation and experimental results show that PV array‑inverter assemblies, especially in master mode, effectively balance energy, maintain power quality, control voltage and frequency, and validate the proposed switching strategy for stand‑alone renewable systems.

Abstract

A substantial increase of photovoltaic (PV) power generators installations has taken place in recent years, due to the increasing efficiency of solar cells as well as the improvements of manufacturing technology of solar panels. These generators are both grid-connected and stand-alone applications. We present an overview of the essential research results. The paper concentrates on the operation and modeling of stand-alone power systems with PV power generators. Systems with PV array-inverter assemblies, operating in the slave-and-master modes, are discussed, and the simulation results obtained using a renewable energy power system modular simulator are presented. These results demonstrate that simulation is an essential step in the system development process and that PV power generators constitute a valuable energy source. They have the ability to balance the energy and supply good power quality. It is demonstrated that when PV array- inverters are operating in the master mode in stand-alone applications, they well perform the task of controlling the voltage and frequency of the power system. The mechanism of switching the master function between the diesel generator and the PV array-inverter assembly in a stand-alone power system is also proposed and analyzed. Finally, some experimental results on a practical system are compared to the simulation results and confirm the usefulness of the proposed approach to the development of renewable energy systems with PV power generators.