Study On Seamless Switching Control Strategy For Ship-shore Power Grid

When the ship stops,the ship uses the diesel generator of the ship to supply electricity,which will cause the pollution of the port.The solution to this problem is to rely on port ships to use shore power supply.The connection technology between ship and shore power is one of the key technologies.Seamless switching between shore power and ship power is to cut off the ship generator,which is the core of shore power grid technology.In this paper,the control strategy of ship shore power grid-connected and seamless switching is studied.In the first part of this paper,the control strategy of ship-shore electricity grid-connected is studied.Firstly,the composition and key technology of shore power system are introduced,and the parameter precision of the grid-connected of the shore power system is explained.At the same time,the mathematical model of ship-shore grid-connected inverter is established.Then,the control strategy of the grid-connected of the shore power system is introduced and the stability of the traditional sliding mode control system and the modified RBF adaptive sliding mode control system are proved.And the MATLAB/Simulink simulation model of ship shore power is established.Meanwhile the modules,which is very important,are verified.Finally,all of the control strategies,which contained PID,traditional slide mode and the improved RBF adaptive slide mode,are verified by the results of simulation,and the effectiveness and reliability of the control strategy are verified by comparing the grid-connected voltage,grid-connected frequency,grid-connected phase,modulation wave and load power.It is verified that the improved RBF adaptive sliding mode control strategy adopted in this paper has better control effect.The second part of this paper studies the strategy of seamless grid-connected control between ship and shore.Firstly,the similarities and differences are explained between droop control and virtual synchronous generator control.Secondly,For seamless grid-connected control,the virtual synchronous generator technology is improved without changing the moment of inertia control in the improved RBF adaptive sliding mode control.Finally,in the MATLAB / Simulink,the power and phase are tested and verified by the simulation results in the grid connection,and the effect of the adopted control strategy is proved,so that the grid connection effectiveness is indicated.In summary,this paper has a good control effect on the research and improvement of the seamless switching control strategy of ship shore power grid connection,which lays a good theoretical foundation for the practical application of ship shore power grid connection in the future.