Seamless mode switching control strategy for SOP interconnected
microgrids with EVs cluster
In interconnected microgrids, the control method for Soft Open Point
(SOP) dynamically switches from PQ to Uf control after fault incidents
to preserve system stability. However, this mode switching induces
frequency and voltage fluctuations, jeopardizing the operational
stability of distributed generations (DGs). This paper presents a
seamless mode switching control strategy specifically tailored for
SOP-based interconnected microgrids incorporating Electric Vehicle (EV)
clusters. We investigate the fluctuations and transient impacts
associated with emergency control switching and propose a decentralized
Virtual Synchronous Generator (VSG) control strategy for energy storage
systems. This strategy factors in the State of Charge (SOC) of batteries
to mitigate imbalances between source and load during switching delays.
Additionally, we introduce a seamless switching method encompassing
collaborative phase angle compensation, control mode transition, and
pre-synchronization techniques to minimize transient disturbances.
Validation through PSCAD/EMTDC simulations and RT-LAB experiments shows
effective suppression of fluctuations and transient impacts, thus
enabling seamless mode switching in interconnected microgrids.