Abstract
This study describes a current controller, based on a Lyapunov control law and a limit cycle oscillator (LCO) to provide stability into the grid-connected photovoltaic (PV) system during grid faults. The current controller also ensures an efficient current injection and active power regulation. The proposed controller offers a high degree of immunity and robustness against perturbation on the grid, due to the three-phase LCO – frequency locked loop (FLL) synchronisation technique. The LCO-FLL is used to compute the positive and negative sequence components of the grid, which are used by a Lyapunov control law in order to control the injected currents into the grid. Moreover, the inverter input voltage is considered in the controller design. The control configuration is proved by two different strategies, balanced injected currents and constant active power in the presence of an unbalanced grid voltage. Simulation and experimental test results are presented to demonstrate the proficiency and performance of the proposed technique in grid-connected PV systems.
Published Version
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