A novel virtual synchronous generator control strategy is proposed for the active-supporting control of renewable distributed generation converters, aiming to achieve active power-frequency (P-f) and reactive power-voltage (Q-V) dynamic support, to provide the necessary inertia and damping for grid stability, and have better multi-inverters’ co-operation capability and access to the grid. First, based on the electromagnetic model of synchronous generator, a novel concept of the virtual stator winding is proposed to adjust the inverters’ output impedance to satisfy the micro-grids’ power decoupling conditions and achieve load sharing between converters, and flux controller is designed to achieve Q-V dynamic adjustment. Based on the rotor motion equation, synchronous controller is designed to achieve P-f dynamic adjustment. Meanwhile, virtual excitation compensation and secondary frequency regulation strategy is adopted to eliminate the voltage and frequency adjustment static error. Finally, the PSCAD / EMTDC simulation and experimental results have verified the correctness and effectiveness of the proposed control strategy.
