Research On Control Of Permanent-Magner Direct-Drive Wind Power Generation System

Today, two problems become more and more urgent to the world, one is energy, the other is environment. Dec,7th—18th,2009, UN CLIMATE CONFERENCE was held in Copenhagen, it's a warning to the whole world. The using of some clean energy as wind power, water power and solar energy has became the focus to many countries, also China. The wind energy of our country is very abundant, its potential is very huge, so wind power generation is very important to the energy industry of our country and the strategy of sustainable development.Recently, the development of wind power generation technology is very fast. The main type of variable speed constant frequency generator tends to be constant. The mainstream generators of the market are double-fed generator and permanent magnet synchronous generator. The doubly-fed brushless generator will become a research direction in few days later.The subject of this thesis is permanent-magnet direct-drive wind power generation system, it is connected with power grid by dual-PWM converter. The main works of this thesis are:Firstly, the process of wind energy turning to mechanical energy is analyzed, the characteristic of wind turbine and the principle of maximum wind power tracing are known.Secondly, the control strategies at generator-side and grid-side are analyzed through mathematical models of permanent magnet synchronous generator and grid-side conventer, and the parameters of PI-controller are calculated.Subsequently, the model of permanent-magnet direct-drive wind power generation system is built in MATLAB/Simulink, and the simulation is made using the conclusion above, to confirm the control strategy.In the end, the simulation results are summarized, the follow-up work is brought up, and the prospect of wind power generation is described.