Robust H-inf Control Of Direct Drive Permanent Magnet Synchronous Wind Turbine System

Wish the development of economy and society, the demand for energy is increasing,fossil energy, such as coal,oil and natural gas, is not only limited in resources ,but also causes serious air pollution,wind energy is a clean,safe and resource-rich h resnewable energy so the exploration and research of wind energy is paid more and more attention by countries all over the world. Wind turbine is directly connected with the generator,reducing the transmission loss,so the direct drive permanent magnet synchromous wind power generator has the advantages of high efficirency, high reliability, low operntion and maitenance casks, and has become a main kind of the large-scale wind power generation.The permanent magnet synchronous wind power generation system is a nunlinear,strong coupling and time-varying system,due to that traditional control system highly depending on the system model and parameters,and the satisfactory the satisfactory control performance is very difficult to be got for maximum wind power tracking (MPPT) of the permanent magnet synchronous wind power generation system based on the traditional control strategy.H-inf control theory can efficiently suppress the influence of fectors such as the pararneter variations and external menge diturbances,thus this paper MPPT based on H-inf control theory of permanentsyrchronous wind power generation.the main contents of this paper are as follows:(1)The basic principle of direct drivs permanent magnet synchronous wind power generation system is derscribed in detail,and the mathematical models of wind turbine and permanent magnet synchronous generator is established.(2)Based on the mathematical model of wind turbine and permanent magnet syschronous generator,design a mathematical model applicable to H-inf robust control,and establishes themodel parameter perturbation system.(3)For robust control problem on the case of parameter uncertainty,in order to improve the system robust stability and robust performance ,based on H-inf control theory and theperturbation mathematical model of the system,apply Matlab robust control toolbox to desing the H-inf controller.And ,use structured singular value theory (mu analysis method) to analysis the robust stability and robust performance of the closed loop system .Finally,perform the analysis and research on the time-domain output response of the perturbed system simulation.(4) Build wind turbine and permanent magnet synchronous generator and machine side converter module in the MATLAB/Simulink software,and the maximum wind energy tracking control of direct drive permanent magnet synchronous generator based on PI control strategy and H-inf control strategy is simulated and compared.(5)A sliding mode -H-inf controller is designed.The sliding mode control method is used to design the input tracking controller of the system to ensure the fast tracking performance of the system; the H-inf control method is used to design the disturbance rejection controller,which can effectively suppress the disturbance and the parameter variation.