Adaptive Transient Power Control Strategy for Parallel-Connected Inverters in an Islanded Microgrid

This paper investigates the transient response of an islanded microgrid equipped with parallel-connected inverters. The transient performance of the microgrid power sharing mechanism can be strongly affected by the system parameters as well as operating point, which may not be acceptable regarding to the system reliability. To improve the transient performance of the microgrid, a novel transient control strategy based on the static droop characteristics is presented in this paper. To provide the active damping of the low-frequency power sharing modes at different loading conditions, the derivative terms of active and reactive powers have been added to droop functions. The transient droop gains are adaptively scheduled in order to yield desired transient and steady-state response. The proposed controller ensures a stable and robust power sharing performance of the microgrid.