Abstract:

It can effectively reduce the environmental pollution if the berthing ship is connected to the shore-to-ship power supply instead of the ship side generator to supply power for the marine load. When the ship berths or leaves the port, there is a short-term parallel connection between the shore-to-ship power supply and the generator to realize the smooth transfer of the marine load. In view of the disadvantage that power overshoot is easy to occur when using traditional droop control to realize load transfer of shore-to-ship power supply, the virtual synchronous generator(VSG) strategy is adopted to control the shore-to-ship power supply, and a two-stage load transfer strategy is proposed to enable the shore-to-ship power supply to share the load power with the generator first and then reach the power command value. Through parameter optimization, the power overshoot in the process of transfer is avoided, and the stability of the system is improved. The simulation results show that the proposed strategy can effectively solve the problem of output power overshoot of shore-to-ship power supply, and ensure the load transfer process smooth and without impact. The research results can provide reference for the design of shore-to-ship power supply.

Key words: Shore-to-ship power supply, smooth transition, two-stage, power overshoot