Automatic Frequency Control Ancillary Service and Virtual Inertia from BESS in Microgrid

Battery energy storage systems (BESS) can effectively improve power system reliability and power grid frequency stability. In this paper, a BESS integrated inverter architecture with ancillary services and virtual inertia is proposed. When the microgrid is operating in grid-connected mode, the BESS can provide ancillary services for frequency regulation and voltage stabilisation. The dynamic power quality compensation strategy is also considered to extend the function of the BESS by prioritising the compensation of reactive power, imbalance and harmonics. When the microgrid is operating in islanding mode, the BESS can increase the frequency stability of the microgrid by applying the virtual inertia technology. Finally, the BESS control architecture is implemented in Matlab/Simulink and the feasibility of the proposed BESS architecture is verified in different simulation scenarios.