Refined Modeling And Real-Time Simulation Of Wind Farm Based On FAST And RT-LAB

With the change of energy structure,clean energy,especially wind power,has made great progress.At present,the installed capacity of grid-connected wind power is increasing day by day.Due to the intermittent and volatile nature of wind power,grid-connection will also have a significant impact on the safe and stable operation of the grid.In order to deeply study the impact of wind farm access on the power system,it is necessary to establish a more accurate grid-connected wind farm simulation model.In this paper,the requirements of complete refined model modeling for wind power grid connected research are described,and the modeling methods of each component of the refined model of wind power unit are proposed,and the real-time co-simulation technology based on multi platform is introduced into the field of wind power research,which has important practical significance.(1)The structure and basic working principle of the DFIG are studied.The dynamic mathematical model of the wind turbine including blade,drive train,generator and converter is established.The torque and pitch control of wind turbine under full wind condition are studied,and the solution method of preset gain table of pitch angle controller in constant power operation area is proposed.The active command control strategy of the wind farm under the scheduling command is studied.(2)A real-time co-simulation platform for refined modeling of wind turbines is designed and implemented based on FAST and RT?LAB,including overall layout,real-time guarantee,and communication interface solutions.The aerodynamic model,structural dynamic model,wind speed model and main control system of the wind turbine are established in FAST,the electrical part and the converter control system are established in RT-LAB,while the rotor kinematics equation is used as the interface between them.Then the simulation of a single wind turbine is carried out,the experimental results of real-time co-simulation platform are compared with those of offline simulation which shows that the established model can reflect the dynamic characteristics of the wind turbine and verify the accuracy of the simulation platform.(3)Aiming at the research of grid connection of wind farms,an electromechanical and electromagnetic hybrid simulation method for power systems containing wind farms is proposed.On the basis of the wind farm electromagnetic transient model built in RT-LAB,the external power grid is established in the PowerFactory,which balances the relationship among scale,precision and speed of system simulation.A wind farm SCADA monitoring system is designed,which can collect electrical data in the simulation process in real time,and can also issue control commands to the wind farm.The field performs active command dispatching and grid voltage sag simulation.Finally,the active command scheduling and grid voltage sags simulation are carried out for the wind farm,and the experimental results are basically consistent with the theoretical analysis.