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×published date:2024-Oct-16
FULL TEXT in - | page 273 - 283
Abstract
The grid-tied inverter is one way to interface renewable power sources such as solar PV, batteries, fuel cells and wind power to the utility grid and ensure efficient conversion, control and exchange of electric power from these sources to the utility grid and vice-versa. The grid-tied inverter also alleviates the challenges of satisfying grid code standards which power system operators demand for renewable energy integration to the grid. In this paper, the model of the grid-tied inverter and associated controllers is developed, analyzed and simulated for active and reactive power flow control. A reference current with a magnitude of 114A is demonstrated to provide active and reactive power flow of 100kW and 100kVA respectively to a three-phase power grid via current control using two PI controllers in the synchronous reference frame. The three-phase inverter is powered from a dc voltage of 800V. Simulation results of active power, reactive power, inverter and grid voltages and currents prove the effectiveness of the PLL and current control method applied for a stable and reliable power supply from the dc source to the grid.
Keywords: Synchronous reference frame Grid, Phase-locked loop Grid-tied inverter Active power ,,,
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