Hardware-in-the-loop Simulation Of Marine Electric Propulsion System

Marine electrical propulsion system gains many advantages over traditional diesel drive system, which is a hot research area in ship manufacturing industry. Modeling and simulation research of marine electrical propulsion system, which can describe static and dynamic running processes, is helpful to discover inherent principles and to direct the design and management of the system.The dissertation develops from the following aspects:the design and analysis of experiment device, mathematic modeling of marine electrical propulsion system, contrast between simulation results and experiment results. The work accomplishes five items of research:1) The marine electrical propulsion system of Wuhan University of Technology is designed and its components, features and working principles are analyzed. Briefly introduces the key questions and technical essentials involved in the frequency conversion experimentation system of marine power propulsion. The whole design of the systemic technical scheme, the selection and control of the transducer, the work principle of the frequency conversion system, the run setting of the transducer, the connection of the process data PZD are also involved.2) The mathematic model of propeller for the lab’s equipments is set up. The whole set of models can be used for system analysis. In order to simulate propeller load realistically, the Chebyshev polynomial fitting method is utilized to express the Nordstrom propeller atlas across four quadrants, which can be adjusted according to various propeller types. The ratio between load torque and real ship’s propeller load is derived from analyzing the machine motion equation, so that the experiment equipments can have the same dynamic characters as the real ship.3) The ship-motor-propeller mathematic model built in Simulink is converted to C code, which can be exported to Real-time system by dSPACE. DS2211 and DS1005 ppc boards are selected to consititute the compact and powerful dSPACE Hardware-in-the-loop simulator. The small-scale physical simulation equipment in hybrid simulation experimental platform of marine electric propulsion is combined to realize the HIL simulation of marine electric propulsion system. 4) In HILS small scale experimental platform of marine electric propulsion, the parameters, such as propeller diameter and pitch ratio, are modified to simulate various kinds of operating modes in real ship. The equipment running parameters and curves are monitored by experiments. The control modes of drive motor are transform to observe work situations under various kinds operations and influence to electric fence. The veracity and validity of the system simulation models are verified by contrasting the models’experimental data with lab’s equipment experiment data. Some basic rules are found through simulation tests and some guide advices are given.The research is supported by the following projects:State "211" Project-"WUT Marine Electrical Propulsion Simulation Lab"; doctor foundation projects of the State Ministry of Education of PRC (No.20100143110004); the Research Fund of HSSE, WHUT, the State Ministry of Education (No. HSSE0802).