The Study Of Ship Hybrid Power System Based On A New Vertical-Axis Propeller

Compared with other transports, the study on energy conservation of ships starts late. Due to the frequent changes of load, it’s a challenge to reduce energy consumption under the requirement of power supply. Especially for the inland vessels, they usually face the complex channel situation, changeable operating conditions and frequently adjustment in diesel engines load, which caused huge amount of energy consumption.In this paper, a kind of hybrid propulsion system with vertical axis propeller used in the tourist boat of Guilin River is introduced. This hybrid propulsion system can realize the automatic mixing of diesel engine and motor through PLC. So it can guarantee the power supply and reduce the emissions and noise at the same time. This paper analyzes the current researches about the hybrid vessels and realizes energy saving in two aspects:propeller and power source. By combining the mechanics analysis and numerical method, a model of vertical axis propeller is created in the software ANSYS. The numerical results showed that the propeller can be well applied to the vessel hybrid system of ship inland.The detailed design of hybrid power system includes the system architecture (which ensured the separate or combine propulsion of the diesel engine and motor), and a rule-based engine efficiency management strategy (which mainly applied to solve the problem of energy distribution under various boundary conditions). Based on the above design and the background of project, the operation design and indexes calculation have been done to obtain an optimal operating mode:17.85% energy saving and 5% noise cut at the same.The development of the hybrid control system is based on S7200 PLC, which can automatically complete the switch between operation model and operating condition. While the design of hybrid monitoring system is based on MCGS, this monitoring system includes the function of human-computer interaction such as input, real-time data display and alarm.Two experiments were carried out in tank and river, respectively. In the tank test, the time of sustainable discharge is 13 minutes when the motor torque is 50%. While for the motor torque of 15%, it only took 10 minutes for the capacity to charge from 50% to 70%. River test was carried out in Lijiang, Guilin after verifying the system feasibility in the tank test, and the results showed that the system could realize an energy-saving target of 10% at least.The study in this paper shows that the hybrid system is feasible, effective and energy-saving.