A Hybrid Synchronization Controller for a Grid-Connected Photovoltaic Inverter with a High Inductive Load

With the ongoing extension of electricity networks, traditional power systems have become increasingly incapable of meeting increased power demands. As a source that is available all year round, solar energy offers to be a promising renewable energy resource for power generation in Iraq. In this paper, a hybrid synchronization controller (HSC) based on the orthogonal method for the generation of reference control signals with PI controllers is used. The proposed HSC is designed for a single-phase photovoltaic (PV) inverter with LC filters for the supply of high-inductive load; it aims to provide (i) stable active power under variations of solar irradiance levels and (ii) low reactive power under the variation of inductive loads. The purpose of the former is to avoid overloading of the PV panels whilst the latter aims to correct the power factor at the PV inverter. A simulation was implemented in a MATLAB-Simulink-environment for the HSC, and the results demonstrated that HSC showed improved performance in terms of maximum active power transfer and power factor correction on the PV-inverter side. (paper)