| Due to the increasingly serious environmental and resource problems,the development and utilization of renewable resources have been paid more and more attention.Wind energy,as a clean renewable energy,has broad prospects for development.With the development of micro-grid technology and the implementation of the National Smart Grid plan,the proportion of wind power in the power grid is increasing.Permanent magnet synchronous generator(PMSG)in direct drive wind power generation system has the characteristics of simple structure,reliable operation,light weight,high efficiency and changeable structure,which can well meet the control requirements.As an important part of smart grid,micro-grid has strict requirements for system control and power quality.Therefore,in order to maintain the safe and stable operation of power grid,it is urgent to study and improve the control technology and algorithm of wind power generation system,so that wind power generation can be improved from "inferior power" with high fluctuation and low efficiency to "excellent power" with stability and high efficiency.Firstly,the operation principle of wind power generator is studied.According to the working characteristics of permanent magnet synchronous generator,the simulation mathematical model of permanent magnet direct drive wind power system is established.The main modules of the system are as follows: By calculating and analyzing the aerodynamic model,the appropriate wind turbine model is established by using the wind resource parameters.Wind turbines are connected to synchronous motors through a two-mass transmission system model.The generated energy is converted by a full-power converter and transmitted to the power grid to achieve efficient and safe grid connection.Secondly,on the basis of the existing maximum wind energy tracking technology of wind power system,the optimal blade tip speed ratio algorithm and the optimal power point algorithm are studied.According to the characteristics of maximum wind energy tracking control,a control method for maximum wind energy tracking control effect of permanent magnet synchronous motor without mechanical sensors is studied and designed by using the principle of sliding mode observation technology,so as to reduce the mechanical transmission.System error caused by sensor.At the same time,aiming at the characteristics of line reactance of wind power system for micro-grid,the droop control algorithm of grid-side inverters is improved,and the virtual impedance is introduced to realize the power optimization of the system.Finally,according to the algorithm and principle studied in this paper,using the Simulink tool in the MATLAB platform,the corresponding simulation model is designed,and the simulation validation analysis is carried out to prove the effectiveness and feasibility of the control algorithm. |
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