A Study Of Modeling Simulation And Optimal Control Of Direct Drive Wind Power System

With the over-exploitation and utilization of the global non-renewable energy sources, a traditional energy crisis is quietly coming. The advantages of wind power generation are non-pollution, wind energy recycled and mature technology, it becoming an important development direction in the field of new energy. The direct drive permanent magnet synchronous wind power generation system used variable speed constant frequency power generation. It have advantages of improve the utilization efficiency of wind energy effectively, high stability and large generating capacity. The power generation method is becoming a hot spot in the research of wind power generation. In this paper, the modeling and simulation of direct drive permanent magnet synchronous wind power generation system as the main line. Study the problems of maximum power tracking control, grid side inverter control and controller parameters optimization.This paper based on the operation characteristics of direct drive wind power system, established the mathematical model of wind turbine, permanent magnet synchronous generator, power electronic converter and DC link, and discussed the control strategy of each parts. Establishment MATLAB/SIMULINK model of direct drive permanent magnet synchronous wind power generation system based on above mathematical model and control strategy. Verify the correctness of the simulation model and the effectiveness of the control strategy. Aiming at the problem of maximum power tracking control of direct drive permanent magnet synchronous wind power generation system, design PID with feedback linearization composite controller on the basis of optimal tip speed ratio control method. The simulation results of composite controller compared with feedback linearization controller and traditional PID controller in low wind speeds, the wind energy utilization coefficient and output power of composite controller are higher than feedback linearization controller and traditional PID controller.On the basis of the above research, aiming at the problem of composite controller parameters and grid side inverter parameters are difficult to determine. By used particle swarm optimization algorithm to multi-objective optimization composite controller parameters and the grid side inverter parameters. Input the proportion parameter, integral parameter, overshoot, error and other required or determine value to particle swarm optimization algorithm. The values obtained by optimization algorithm input to control system and start simulation. The simulation results show that the PSO algorithm optimization of composite controller for direct drive wind power system maximum power tracking control is more effective, while the grid side inverter PI parameters by optimization can make the DC bus voltage quickly reached a stable value, and the voltage and current of grid are stable.