Filtered Repetitive MPC applied to DFIG Grid Side Converter frequency support in microgrids during island operation

As the trend towards decentralization of grids continues, new typologies such as microgrids have gained popularity in recent years. Microgrids offer greater reliability they can operate both connected to main grid and islanded mode. However, transition island mode be even more challenging when a microgrid has high penetration intermittent sources like Doubly-Fed Induction Generators (DFIGs). In this context, designing controller algorithms is essential improve frequency support with DFIGs. Therefore, paper proposes novel Filtered Repetitive Model Predictive Control (FR-MPC) applied microgrid. The control structure Grid Side Converter (GSC) DFIG, while DC bus voltage supplied by Battery Energy Storage System (BESS). FR-MPC prediction model uses state-space an embedded repetitive action, which capacity mitigate harmonics inclusion loop degrades closed-loop robustness. To overcome limitation, features robustness low pass filter. loop. Furthermore, presents analysis response pole map key components controller: ZP-FIR, loop, law. Finally, simulation results demonstrate that proposed outperforms pure MPC (R-MPC) Generalized (GPC) terms performance.