Study On Output Power Optimization Control Of Switched Reluctance Wind Power Generation System

Under the background of the global energy crisis,wind energy has been paid more and more attention by the countries all over the world as a kind of clean and renewable resource.However,wind energy has the uncontrollable characteristics of intermittency and randomness which leads wind turbines to operate at the maximum power point difficultly.Moreover,the efficiency of wind power generation system will be reduced as a result of it.In this paper,Switched Reluctance Generator was taken as the research object,and the better maximum wind energy tracking of switched reluctance wind power generation system was identified as the research goal.Then,The effects of different control parameters,excitation mode and power topology on the performance of SRG wind power generation system were studied.Finally,the maximum wind energy tracking method of switched reluctance wind power generation system based on fractional order PI?D?were designed.The major works are as follows:(1)Research of basic theory for switched reluctance generator.8/6 pole SRG was chosen to represent the motor structure of SRG,and the principle of generating electricity was analyzed.The phase current equation and the relation equation between inductance and position angle about ideal linear model were deduced.The excitation mode used in the thesis and the working principle of the power converter were analyzed.The working principle,advantages and disadvantages of the traditional control method and control strategy of SRG were compared.The control principle,advantages and disadvantages of the wind speed tracking control scheme,the speed feedback control scheme and the power disturbance control scheme are summarized.(2)By using improved optimization algorithm of molecular dynamics theory to tune PID parameters and achieve MPPT.Aiming at the shortcomings of molecular motion theory optimization algorithm which is easy to fall into local optimum,it was improved by Kent chaotic mapping which was used to carry on the chaotic disturbance near the local extreme point and replace the original particle to guide the algorithm to jump out of local optimum.The whole simulation model of SRG wind power generation system was built in Simulink.The improved molecular dynamics theory was applied to the parameter tuning of the PID controller in the speed closed-loop system,and Kp,Ki,Kd three parameters of PID controller were optimized under different wind speed conditions.Compared with Cp optimization curve,wind turbine speed optimization curve,SRGspeed optimization curve and wind power output curve,simulation results show that the accuracy and robustness of the PID control after tuning were improved.(3)The maximum wind energy tracking method based on fractional order PI?D?was proposed.Rational approximation and modular processing of fractional order PI?D?were implemented in the platform Simulink,and the basic wind,gradient wind,random wind,gust wind and the combination of winds were simulated.In order to highlight the control effect,the special step wind and random wind were used as the given wind of SRG wind power generation system,and The improved molecular dynamics theory was applied to the parameter tuning of fractional order PI?D?.The optimal curve for each parameter was given through Simulation.Compared with Cp optimization curve,wind turbine speed optimization curve,SRG speed optimization curve and wind power output curve,simulation results show that the fractional order PID controller has better control precision and robustness than the integer order PID controller.(4)GUI design of Output Power Optimization Control for Switched Reluctance Wind Power Generation System.In order to facilitate the use,the maximum wind energy tracking system in the Switched Reluctance Wind Power Generation System is designed by GUI in this paper.The design makes the use of the human-computer interaction,which simplifies the setting of system control parameters.It can present the simulation results in front of users under different combinations of control parameters,and also provides a convenient way to analysis the data.(5)Construction of the hardware platform for the Switched Reluctance Wind Power Generation System.In order to combine the theory with practice,the hardware platform of switched reluctance wind power generation system is built based on the work foundation of the previous chapters.The hardware platform includes the hardware circuit design,control program design and the PC design.