Research On Power Control Of Doubly-Fed Wind Power Generation

Nonrenewable ossil fuels such as coal causing serious pollution to the environment has become a problem that need to solve immediately in the process of human implementing sustainable development strategy, the inevitable choice to solve the problem of energy crisis and environmental pollution is full development and utilization of renewable energy. With the characteristics of the world’s fastest development and large-scale developmen renewable energy, wind energy has huge potential to become a clean energy to protect the earth’s ecological environment. The way to maximize the use of wind energy become the focus in the field of wind power generation research. It is important for the practical application of wind power generation system to establish the simulation model of each part of the wind power generation system.Paper first elaborated background and significance of the research and deduced the aerodynamics of wind machine. Established the simulation model according to the wind energy equation and got wind turbine characteristic curve in different pitch angle. The simulation model can simulate the maximum capture of wind power at the different pitch angle.Because of DFIG is the core of VSVF wind power generation system,this paper elaborated the principle of DFIG, deduced the steady-state equivalent circuit of DFIG and the matrix equation transformation between different coordinate systems. Based on the above theoretical knowledge, this paper eatablished the simulation model of different coordinate syserms and DFIG.Then based on the dual PWM power converter structure, this paper proposed Grid Voltage Oriented on grid side converter and Stator Voltage Oriented on rotor side converter. Baded on above theoretical knowledge and basic principle and realization method of space vector modulation, grid side converter, rotor side converter and SVM simulation model are established.Matlab/simulink simulation software is used at the end of this paper. Rotor side converter was used M documents prepared by the MPPT strategy simulation, grid side converter was given a DC reference voltage to control the output voltage. The simulation results verified the power tracking control strategy and the voltage control strategy is effective and feasible, the simulation models have great value and theoretical guidance in real wind power systems.