Monitoring System Design And Development Of Multipoint Direct-drive Wave Power Generation

Chinese coastline is wide and rich in ocean energy resources. The Chinese National TwelfthFive-Year Ocean Science and Technology Development Plan, just introduced,clearly points outthat the economic contribution of ocean science and technology should increase from54.5%inthe period of "Eleventh Five" to60%. The number of the research for marine energy is increas-ing.Ocean energy, as a kind of no pollution clean energy, is not only rich in species but also ab-undant in reserves. Now a lot of countries are studying the conversion of ocean energy. Waveenergy is one species of ocean energy. It is the most widely distributed without geographical re-strictions which has been used to generate electricity. However, how to take advantage of waveenergy to generate power perpetually and efficiently has become a problem due to the complexi-ty of ocean environment and the rapidly changes of the wave height. In addition, currently thestudy of the control strategy for wave power system and the design and development for moni-toring system is less involved.Supportted by the special fund project of renewable energy project of the national oceanicadministration(project ID:XMME2011BL02) and the Natural Science Foundation of China(project ID:51209104), our team has completed a set of wave power generator device indepen-dently and built a multipoint direct-drive wave energy experimental prototype of semi-physicalsimulation. Based on the features and functions of the experimental prototype, this paper simu-lated and analyzed the running mechanism of the system, studied the constant speed controlstrategies and built a intelligent monitoring system and also conducted a statistical analysis ofexperimental data. The main contents are as follows:(1) A simulation model of multipoint direct-drive wave energy generation was established,including wave model, oscillation float model,generator model,mechanical transmission systemmodel, electrical load model and so on. Finally, the simulation and analysis for the overall modelof the system are given.(2) Regular and irregular wave energy importation were achieved by simulation. Accordingto the characteristics of wave energy power generation, using fuzzy adaptive tuning PID controlto realize constant speed operation of the wave power generation system.(3) Intelligent monitoring system of multipoint direct-drive wave energy generation systemhas been designed and developed. Siemens S7-200is used as lower machine and the monitoringlayer of the higher machine uses realistic man-machine interactive interface provided by king- view software through which can monitor and control running state of the semi-physical simula-tion system.(4) Acquisition and analysis of the experimental data for the semi-physical simulation pro-totype have been completed. Achieving the vertical movement of the hydraulic cylinder throughcontrolling the inverter signal simulates the importation of the wave.5kinds of programs are setin the experiments and the total input power,output power, output current and output voltage inevery program are obtained.(5) Design and development of a monitoring software of the wave gauge were completed. Itconducted a wave instrument collector design, selected the data acquisition card model andmeasured the wave height, wave period and many other parameters through compiling PC acqui-sition program. Finally, the wave gauge is tested in the tank.