A consistent dynamic response control strategy for virtual synchronous generator

Abstract

Virtual synchronous generator (VSG) has been developed recent years as a promising grid-tied inverter control strategy because it can improve the penetration of the renewable energy. Due to introducing virtual inertia, the active power loop of VSG behaves as a typical second-order system, which may cause active power oscillation. It is a key issue that designing the parameters of active power control loop to satisfy the requirements of the system stability and dynamic performance. Because the system dynamic characteristics change with the variation of the steady-state operating point, traditional VSG control method cannot keep the pre-designed optimized dynamic response. As a result, when the external perturbation is too large, the VSG would produce a large power surge or oscillation, which may make the VSG operate abnormally and even become unstable. To tackle this issue, a consistent dynamic response control strategy for VSG is proposed in this paper, which can ensure that the dynamic response of VSG keeps expected pre-designed performances. Both the simulation and experimental results validate the effectiveness of the proposed strategy.