Research On Mooring Tidal Current Nenergy Conversion Systemand Its Controller

As known to all,energy resourse is the material basis of social development. With the increasing consumption and growing depletion of fossil fuels,the research and application of renewable energy has been drawing the attention of more and more coutries in the world. China has broad sea areas and the tidal current energy will alleviate the increasingly prominent energy issues to a large extent if effectively exploited. Supported by State Oceanic Administration People’s Republic of China,this dissertation mainly focus on the analysis and design of the control system for mooring tidal current energy conversion.First,the operating characteristic curves of Permanent Magnet Synchronous Generator(PMSG) and hydroturbine are researched and obtained,by mathmatical modeling and simuliation of using Simulink. Meanwhile, two key technologies of tidal current energy conversion system — MPPT and SVPWM are analysed by making mathematical models and simulated by using the MATLAB/Simulink software. The results of simulation confirm that it is advisable to realize time-tracking of the maximum power point with the hill-climbing algorithm,and SVPWM technology could get a good control effect in the process of conversion.Then,the moring tidal current energy conversion control system is studied and analysed to determine the framework of the control system, MPPT method and means of communication tec. In order to achieve the remote control and monitor of the underwater power-generating device,and realize the acquisition of analog or digital signals,a distributed control system based on ATmega128 microcontroller and CAN bus is designed in this thesis. The control system contains hardware circuit design and software design. The former mainly contains five parts,which are ATmega128 microcontroller module,power module,CAN communication module,data acquisition module and driver module. The later consists of underwater control module and on-shore control module. The underwater control module is used for data acquisiton and driving actuators, the on-shore control module is designed to receive data and send control commands.In order to realize the normal operation of the hardware of the control system,the control software are devised by using C language,completing each module by using modular programming method. The two modules of the control softwares are familiar and mainly contain nine modules. Meanwhile, a monitoring interface is also designed by Lab VIEW software so as to achive real-time monitoring of power generation state.Finally,the feasibility of the tidal current energy conversion control system is verified by simulation of preteus software and physical testing of the whole control system. The modules and the whole control system are tested respectively by simuliation or testing. Resuls show that modules of control software and hardware circuit are correct and feasible, the data communication is reliable and the monitoring system is operating normally at 100 kbps data rate.