Research And Implementation Of Doubly Fed Wind Power Simulation System

Globally,with the growth of energy crisis,there gelation of energy structure has become more and more urgent.As a huge renewable clean energy,wind energy has a unique advantage in alleviating energy shortage and environmental problems caused by traditional fossil fuels.At present,wind power has become one of the main forms of utilization of wind energy.Among them,the variable speed constant frequency doubly fed wind power system has become the mainstream wind power system because of its small capacity,low cost,high efficiency and flexible grid connection.For this reason,based on its topology,the research work is carried out for the 3kW doubly fed wind power simulation system.In this thesisthe system mathematical model and control strategy have been analyzed,and the optimization design and system-level implementation of the control algorithm are performed.based on the traditional control strategy.Firstly,on the basis of studying the excitation power and control strategy of doubly-fed wind power systems,a double-fed wind power simulation system has been constructed,and the operating principle and mathematical model of the Double-Fed Induction Generator and the Back-to-back converter system have been described in detail.Secondly,using vector control theory,the control strategy of two converters in Back-to-back converter system has been analyzed to design their control structures.And the simulation model of doubly fed wind power generation system has beenbuilt in the Matlab/Simulink simulation software.the simulation experiments under different conditions have beencompleted.A large number of simulation results have verified the correctness and feasibility of the control strategy.Thirdly,in order to meet the need of the robustness of vector rotation transformation controller based on traditional PI adjustmentunder different conditions,,an optimal control strategy of rotor side converter based on sliding mode theory is proposedin thisthesisr,and the theoretical verification has been carried out in the simulation model,Then the simulation results have shown that the control strategy can be optimized within a certain working condition.Finally,according to the topological structure of the system,the design and implementation of the hardware and software of the doubly fed wind power simulation system have been carried out respectively.A series of experiments,such as no-load grid connection,power decoupling control,have been realized based on the experimental platform of 3kW doubly fed wind power simulation system.These experimental results are consistent with the theoretical analysis and algorithm simulation results.the correctness and reliability of the design of the hardware and software of the Double-Fed Induction Generator simulation system have been proven.Then,on the basis of systematic routine experiments,the optimal control strategythat is,a power outer loop control strategy based on fuzzy control,has been introduced..The experimental results have fully shown that it can not only meet the requirement of various operation conditions after the system is connected to the grid,but also achieve system performance optimization.