Design And Development On Testing System Of Underwater Monitoring Device For Tidal Stream Turbine

As a kind of clean, safe and renewable green energy, tidal stream energy has a very broad prospect for development and utilization, which has obtained more and more attention around the world. The complexity of the marine environment has determined that the research of tidal stream energy converter system is an interdisciplinary and integral field, involving marine science, marine engineering, mechanical engineering, electrical engineering, materials science, automation and so on. The research has the characteristics of large academic span, complex technology and highly difficult development. Currently, the development and utilization of tidal stream energy is still in the exploratory phase and the crucial technologies for tidal stream energy converter system still need to be broken through.In support of renewable energy special fund of the State Oceanic Administration, Ocean University of China has developed a 50kW horizontal axis tidal stream energy converter system. As an important part of the power conversion system, the underwater sets monitoring devices are installed in the underwater sets electrical compartment and bear the task of information collection for underwater sets, data communications and pitch control and so on. Once the sets are placed underwater, the underwater monitoring devices will run automatically under the unattended condition, and the stability and reliability will have direct impact on the performance and security of the underwater sets. Therefore, it is very necessary to carry on a comprehensive and systematic test and evaluation on the underwater monitoring system automatically.In this thesis, aiming at the test demand for underwater monitoring devices of tidal stream energy converter sets, a distributed system design scheme based on FPGA is put forward. The test system consists of real-time test simulator and test host computer. Multiple real-time test simulators communicate with test host computer via Ethernet to achieve testing, monitoring and evaluation on device integrity, performance stability and communication security of the underwater monitoring devices. The main works of this thesis are as follows:1. Establishment of simulation models for perception objects and underwater sensors in underwater sets. Description of the dynamic process for the perception object and deduction of process simulation algorithm. The basic model of sensors, simulation algorithms, calibration algorithm and fault simulation algorithm are provided;2. Design of a distributed real-time test simulator to simulate output of different kinds of perception objects and sensors in underwater sets; The simulator, which uses FPGA as the controller core, has many characteristics such as multiple interfaces, strong computing function, real-time property, networking, high scalability;3. The test master software is developed based on VC++, which realizes parameters configuration, process setup and operation control for real-time test simulator. Meanwhile, the software has the function of test data display, storage, management, analysis and evaluation;4. Aiming at the system structure and test demand of pitch control device, pitch motor discrete simulation model and related sensors model in the pitch control subsystem are established to achieve simulation test for closed-loop system.