Research On The Application Of Wireless Power Transmission Technology On Ships

In recent years,pure electric ships using lithium-ion batteries and super capacitors as power sources have received attention in the field of new energy ships and have gradually been widely used.At present,the plug-in charging method of shore power wires mainly used in pure electric ships has shortcomings such as easy aging of the contact port,insufficient flexibility due to too large cables,time-consuming manual cable insertion,and potential safety hazards of electric shock.The wireless power transmission technology removes the need for cable connection between the ship and the shore,and has no exposed wires,which improves the safety of the charging process.Therefore,it is of great significance to carry out research on the wireless energy transmission technology suitable for ships for the charging method of pure electric ships.This paper takes the wireless power transmission system as the research object,aiming at the problem of the relative movement of the primary and secondary side coupling coils,which affects the performance of wireless power transmission due to the swaying of the ship due to wind,wave,loading/unloading during berthing and charging.The key technology of anti-excursion performance of wireless power transmission system in the field of ships,the theoretical and method research is carried out from the three aspects of the magnetic coupling mechanism,resonance compensation topology and control strategy of the wireless power transmission system,so as to improve the anti-excursion performance of the system and make the wireless energy transmission system is suitable for pure electric ships,thereby improving the safety and flexibility of its charging process.The details are as follows:(1)This paper analyzes the sway of the ship when berthing,introduces the horizontal offset,vertical offset,angular offset and other different types of offsets between the coupling coils caused by the ship sway,carries out simulation tests on various offsets,analyzes the impact of offsets on the wireless energy transmission system,so as to improve the anti drift performance of the system as the key and difficult point in the application of WPT technology to the ship,and carry out follow-up research.(2)The magnetic coupling mechanism is analyzed,the relationship between the coupling coil,the ferrite core structure and the coupling performance of the magnetic coupling mechanism is studied,and the magnetic coupling mechanism with a certain anti-offset capability is designed.(3)Model and analyze the resonance compensation topology,study the transmission characteristics of various topologies,determine the resonance compensation topology suitable for the ship WPT system,enhance the anti-offset capability of the WPT system,and improve the transmission efficiency of the system.(4)Formulate a control strategy suitable for the ship’s WPT system to stabilize the output voltage and reduce the impact of offset on the output power of the ship’s WPT system.(5)The simulation model of ship WPT system is established in Matlab/Simulink simulation software to simulate the offset of primary and secondary coils,and simulation tests are carried out to verify the performance of ship WPT system.(6)The power transmission capacity test,ship heave simulation test and ship sway simulation test are carried out on the test platform to verify the performance of the ship WPT system.This paper makes a preliminary basic research on the application of WPT technology in pure electric ships,analyzes the impact of ship offset conditions on the traditional wireless power transmission system,and then takes improving the "anti offset" performance of the system as the core task of the technology applied to ships,and carries out the follow-up work.Then,the modeling simulation and characteristic analysis of the magnetic coupling mechanism are carried out,and the magnetic coupling mechanism and resonance compensation topology suitable for the ship WPT system are selected;Then,the control strategy of the ship WPT system is formulated,the simulation model of the ship WPT system is established in Matlab/Simulink,and the simulation test is carried out;Finally,the wireless power transmission test and antioffset test were carried out on the test platform.The test results show that the WPT system has a certain anti-offset capability,which can reduce the influence of ship offset on the transmission performance of the system,and enhance the adaptability of the system to the ship berthing offset condition,which is beneficial to the application of this technology on ships.