Performance Improvement of Predictive Direct Power Control of Grid-Connected DC-AC Converter

The growing need for renewable energies has resulted in their extensive integration into the grid. However, incorporating these systems comes with various challenges. These challenges encompass the preservation of grid stability, voltage regulation, ensuring grid protection, compliance with grid codes and standards and power control. This research study provides enhanced predictive direct power control (P-DPC) approach for grid-connected two-level inverter. In the suggested P-DPC, a novel sequence of voltage vectors is developed based on the angular position of the necessary inverter voltage vector instead of the grid voltage vector. As a result, low-order harmonics in AC currents are eliminated, and periodic oscillations in reactive power are alleviated with reduced switching losses. To assess the performance of the P-DPC approach, numerical simulations are carried out for steady-state and dynamic operation conditions where the improved P-DPC shows its superiority in terms of power oscillations, line current quality and switching losses when compared with the classical P-DPC.