A Common Second Frequency Control of Island Cascaded-type Microgrid

Cascaded-type microgrid plays an important role in high voltage level applications. The frequency regulation is the guarantee for obtain a high supply power quality. This paper proposes a common second frequency control for cascaded-type microgrid based on low bandwidth communication. This proposed method is capable to achieve frequency recovery under both resistive-inductive and resistive-capacitive load. Meanwhile, the proper power sharing is obtain. Moreover, the communication cost is decreased compared centralized control. Finally, the feasibility of the proposed method is verified by simulation results.