Abstract
This paper presents a control scheme for a photovoltaic (PV) system that uses a single-phase grid-connected inverter with low-voltage ride-through (LVRT) capability. In this scheme, two PI regulators are used to adjust the power angle and voltage modulation index of the inverter; therefore, controlling the inverter’s active and reactive output power, respectively. A fuzzy logic controller (FLC) is also implemented to manage the inverter’s operation during the LVRT operation. The FLC adjusts (or de-rates) the inverter’s reference active and reactive power commands based on the grid voltage sag and the power available from the PV system. Therefore, the inverter operation has been divided into two modes: (i) Maximum power point tracking (MPPT) during the normal operating conditions of the grid, and (ii) LVRT support when the grid is operating under faulty conditions. In the LVRT mode, the de-rating of the inverter active output power allows for injection of some reactive power, hence providing voltage support to the grid and enhancing the utilization factor of the inverter’s capacity. The proposed system was modelled and simulated using MATLAB Simulink. The simulation results showed good system performance in response to changes in reference power command, and in adjusting the amount of active and reactive power injected into the grid.
Highlights
Distributed generation (DG) systems are gaining global interest as a result of environmental concerns, increase in fuel cost, political reasons, and economic impact
The PI regulators were of the inverter during normal and faulty operations of the grid-connected inverter
The PI regulators tasked regulate the activethe and reactive flow according to Maximum power point tracking (MPPT) settings
Summary
Distributed generation (DG) systems are gaining global interest as a result of environmental concerns, increase in fuel cost, political reasons, and economic impact. Renewable energy sources accounted for 17.5% of the global energy consumption in 2016 [1]. PV energy is considered one of the most popular renewable energy sources. It is a clean form of energy, inexhaustible, requires little maintenance, offers flexibility of installation, and its cost is decreasing [2,3]. Solar PV generation increased 31% in 2018 and represented the largest absolute generation growth (+136 TWh) of all renewable technologies, slightly ahead of wind and hydropower [4]. For power output below 10 kW; single-phase voltage source inverter (VSI) configuration is found to be one of the preferable methods for interfacing and integrating small ratings PV system to the grid [5,6,7]
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