| The combined diesel and gas turbine(CODAG)can obtain better economy and endurance when using a diesel engine during cruising,at high speeds,the power of the propulsion diesel engine can also be incorporated to drive the propeller to increase the speed.This kind of power plant is one of the future development directions of ship power in China.However,when two different prime movers work together,complex control is the key technology,and hardware-in-the-loop semi-physical simulation method is an effective means to study the control law and strategy.In this paper,the problem of load distribution and speed regulation in the process of combined diesel and gas turbine was studied in depth.Based on the semi-physical simulation method with similar rotor dynamic characteristics,a semi-physical simulation experimental platform for dual-engine combination was built to provide an effective platform for the research of its control law and method.This paper studies the dynamic performance of the combined diesel and gas turbine plant under different operating conditions.The semi-physical simulation test bench and the dual-engine combination control method were verified and improved during the process of experiment.The main research contents of this paper were as follows:1.Based on the idea of modular modeling,after describing the mathematical model of each component of gas turbine and diesel engine device,aiming at the characteristics of different components,the dynamic simulation model of marine three-axis gas turbine and diesel engine were built in MATLAB.In this paper,several commonly used combine control methods were summarized,and the combine control method of CODAG was developed according to the characteristics of the combined diesel and gas turbine power plant.2.The semi-physical simulation was carried out by using the similarity principle of rotor dynamic characteristics.An overall scheme of semi-physical simulation based on prime mover model to drive variable speed motor was proposed.A combined power semi-physical simulation experimental platform was designed,in which the motor plus simulation model replaced the prime mover,the hydraulic dynamometer replaced the propeller,the SSS clutch,the gear box and the measurement and control system were used as the real objects.3.Semi-physical simulation test bench control system research.Using the real ship power control core PLC control technology,the hardware design of the test platform measurement and control system was carried out,and the hardware system was built.According to the operation law of combined diesel and gas turbine power plant,the combine control method and the safety protection requirements during the experimental process,the software design was carried out.The software and hardware debugging of the measurement and control system was completed.4.The joint adjustment between the hardware system and the software system of the semi-physical simulation of combined diesel and gas turbine test bench was completed.And the semi-physical simulation of combined diesel and gas turbine was carried out.The rationality and practicability of the dual-machine combine control method and the designed dual-machine combination semi-physical simulation test bench control system were verified.The characteristics of the dynamic process for the combination and splitting of the CODAG plant was explored. |
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