Design And Development On The Power Control System For Tidal Current Energy Power Generation Equipment

With the rapid development of social economy, requirement for energy resourceincreases continuously, but the growing depletion of the traditional fossil energy andthe deterioration of the environment caused by large consumption of the traditionalfossil energy have become the urgent world issues. Therefore, the major energycountries in the world are actively regulating and improving their energy structure,and developing renewable energy resources.As a new kind of renewable non-polluting green energy, tidal current energy isabundant, safe, clean, renewable, sustainable and with good predictability, which hasbecome the most rapidly developing branch in the Ocean energy developmenttechnology field. As a high-tech device which is an integrated innovation system,there are several key technologies need to be solved for the horizontal axis tidalcurrent energy power generation device. The researches on the feasibility and thepower converter topology for the horizontal axis tidal current energy powergeneration device, and how to improve the safety and reliability of the equipment, andhow to realize the stability of power output and the maximum of the captured energy,are the key technologies in the research of tidal current energy power generationtechnology.The subject derives from the project---The power conversion and detectionsystem for the turbine of the100kW horizontal axis tidal current energy powergeneration, which developed by the Ocean University of China and the State OceanicAdministration. Firstly, the overall design of the system is analyzed and given.Secondly, on the basis of borrowing and sucking the mature technology of the windpower and turbine power generation, then through theoretical analysis, mathematicalmodeling, and the simulation tests, two key issues about the system have beendetailed studied, which include the power converter topology for the tidal currentenergy power generation device and the maximum power tracking control strategy oftidal system.Analyzing and researching on the power converter topology for tidal currentenergy power generation device that according to the characteristics of tidal currentenergy and the demands of tidal system, which has great significance on the design and development on the tidal current energy power generation system. The paperintroduces the power converter system of the power generation device and its variousfunctional modules, it was studied the correction technology for power factorcorrection (PFC) and the topology of three-phase boost PFC converter, especiallyanalyzed the single-switch three-phase Boost PFC, then illustrated the workingprinciple and presented the detailed performance analysis of the converter, theparameters of the key components in the converter is determined and the topologywas simulated and verified.Another important work in the thesis is to research the maximum power pointtracking of the tidal current energy power generation system. The variable-speedcontrol that is the maximum power tracking control of the tidal current energy powergeneration system is especially studied, analysis and comparison was made on severalcommon MPPT control algorithm, and the MPPT control method based on powersignal feedback (PSF) which studied in the paper is determined. Model analysis andsimulation studies for the various subsystems of the power generation system isdiscussed, the simulation model of each subsystem is established. Following that, thewhole hydroelectric machine system with maximum power tracking control wasestablished, simulated and verified, all of that studies will provide theory support forthe following-up research work.Finally, a summary of the research work about this article is made. In addition,some problems and some further recommendations are discussed.