Two-level Frequency Regulation with a Combination of DMPC and PR-HC Controller For Inverter-Based AC Microgrid Considering Virtual Inertia Support of BESS
摘要
As a consequence of the increment in renewable followed by the transition from conventional synchronous power resources into Inverter-Based Resources (IBR), power system stabilities and energy qualities characterised by the system inertia, and harmonic, respectively reduce considerably. Therefore, maintaining a reliable and resilient grid will become increasingly difficult. The concept of isolating and self-controlling microgrids is getting more attention than ever. This article proposes an autonomous hierarchical frequency control scheme for an island microgrid that utilises the advanced combination of proportional resonance and harmonic and model predictive control methods to ensure isolated microgrid operation in different scenarios. Besides, the virtual inertia control for the energy storage system is implemented to support the autonomous operation of the microgrid. The proposed control scheme is tested on a 4-bus AC Microgrid using a MATLAB/Simulink environment. The results show that the proposed control strategy has outweighed performance in Total Harmonic Distortion (THD), time response and frequency nadir compared to fully model predictive control.