Modeling And Simulation Of A Permanent Magnet Direct Driven Wind Farm In Heilongjiang Province

Permanent magnet direct drive synchronous wind turbine has become an research hotspot and development direction in the field of wind power technology because of its simple structure,reliable operation and high efficiency in Contemporary wind power generation system,the capacity of grid connected wind farm based on direct drive permanent magnet synchronous generator increases gradually in the system.A 1.5MW direct drive permanent magnet synchronous wind turbine and the corresponding actual wind farm in Heilongjiang province were analyzed for modeling and simulation,grasping the characteristics of unit core data under different operation conditions,which laid the foundation for the further study of wind farm access system.Firstly,this paper introduces the main structure unit,established the mathematical model of wind turbine,combined with the actual situation of the target unit operating characteristics and control in different operation stages of the unit,deduces a mathematical model of permanent magnet synchronous generator and full power converter in different coordinates.Secondly,analysis of the wind turbine to achieve the basic principle of maximum power tracking control;the control objectives and control method of the machine side and the grid side converter,the selection principle of PI parameters is presented for grid side converter and machine side converter;study the basic principle of space vector modulation strategy,the realization process of space vector the proposed modulation strategy is given;in symmetrical grid fault conditions using storage battery low voltage control method to achieve coordinated system with grid side converter through given battery energy storage control system and grid side converter box;the generator side and grid side simulation platform are built by Matlab/Simulink simulation software and verify the effectiveness and feasibility of the control strategy.Finally,the whole simulation model of the wind turbine and its real wind farm in Heilongjiang province is built by Matlab/Simulink simulation software,and the simulation analysis is carried out at different wind speed of normal and symmetrical fault conditions.The results show that,the set-up wind turbine model can achieve maximum power tracking control by fast tracking of wind speed variation,and has low voltage ride-through ability;The set-up simulation model of wind farm with the coordinated control system can effectively suppress the adverse impacts of faults in power grids,and has the low voltage ride-through ability,and thus the effectiveness of the wind simulation system has been verified.