Feedforward-feedback compound control to improve dynamic and steady-state performance of grid-forming virtual synchronous generator

Grid forming virtual synchronous generators have been widely adopted and are equipped with active grid support capability. However, the dynamic overshoot and steady state deviation may be introduced by the disturbance from active power command and grid voltage and frequency in the case of limited damping as well as coupling between virtual damping and frequency regulator coefficient. This article proposes a compound control method based on the active power deviation feedforward and active power positive feedback control theory, which suppresses power oscillation and eliminate steady state deviation. Furthermore, the parameter design and system stability of the proposed control are illustrated by the active power response. Finally, the effectiveness of the proposed compound control and the corresponding theoretical analysis are verified through the hardware-in-the-loop results.