Research On Intelligent Shore-based Control Shore-to-ship Power Supply System

Shore-to-ship power is one of the effective strategies to reduce air pollution of ports.By connecting the shore-to-ship power,the ship diesel engines are turn off,and zero release be achieved.The research of shore-to-ship power is of positive significance to energy conservation,emission reduction and construction of green ports.The thesis focuses on a new intelligent shore-to-ship power supply system.A shore power system which is adapted to different ships and different working conditions is designed.Several control strategies of seamless grid-connected are studied.The integrated simulation of shore-to-ship power supply system is established,including the shore power system and the marine power system,etc.Based on MATLAB/SIMULINK,the simulation models are established.Main work of the thesis is as follows:(1)Research on international standards of shore-to-ship power supply system and difference of ships is accomplished.Relevant standards of IEC,EU,China and classification societies for shore-to-ship power system are summarized.The design and connection standards of domestic and foreign shore-to-ship power equipment are studied.The power characteristics,power supply mode and marine power system of major ships are summarized.Different shore power supply system,marine power system,working conditions and distribution mode are analyzed.(2)Research on the structure of intelligent shore-based control power supply system is accomplished.The topology,configuration,transition mode,control strategy and other key issues of new shore-based power supply system are designed.The design scheme of overall system is established and improved,which can realize the instantaneous transition of ship’s power source.Based on this method,it is convenient to realize the conversion of auxiliary machine and shore power supply.(3)Research on seamless grid-connection control of shore-to-ship power is accomplished.The flow of seamless grid-connection,detection and adjustment methods of grid-connection conditions are studied.The detection and control model are established.Based on the model and analysis of inverter,several control methods of inner ring and outer ring are proposed.The case analysis shows that the control strategies have good stability and effectiveness.(4)Research on the self-adaptive power supply of different working conditions is accomplished.Load and working conditions of ships are different.The working conditions of ship are detected and judged by the load,power factors and system capacity,etc.An adaptive control strategy based on master-slave and peer-to-peer structures is proposed.Simulation results show that the strategy can meet the requirements of different operating conditions and automatically increase the capacity of the shore power system.(5)Research on self-adaptive power supply system of different ships is accomplished.The parameters of different ship power systems are detected and judged,including voltage,frequency and phase harmonic,etc.A control strategy based on the combination of neural NARMA-L2 and traditional V/F control is designed.Simulation and case analysis show that it can effectively improve the stability and effectiveness of grid-connected.