Research On The Simulation Technology Of Wind Turbine Characteristic

Wind power generation technology is an important tool to solve the energy crisis and environmental pollution.The research and development of wind power generation technology need a lot of experimental exploration and verification.However,due to the special structure of wind turbines and the restrictions on environment,safety and so on,it is difficult to carry out practical experiments on large wind power system in the laboratory.With the output characteristic of real wind turbine,wind turbine simulation platform could provide experimental condition,for the study on wind power generation system grid-connected converter control and its output characteristics in micro-grid.Hence,the research of wind turbine characteristic simulation technology and its experimental platform is great importance to support the research on wind power generation system.This thesis is aimed to study the accurate and reasonable simulation technology on the horizontal three-blade wind turbine,which is widely used in practice.Based on the structure of wind turbine components,the mathematical model of wind turbine simulation is studied.This thesis analyzes the different operation states of the wind turbine and puts forward a scientific and reasonable simulation strategy.In order to verify the mathematical model and simulation strategy,a simulation test platform for wind turbines was developed.The main research work of this thesis is as following:Firstly,the mathematical models of wind speed,wind wheel and transmission chain in wind turbine simulation are established,and a proportional wind turbine model is established to simulate an actual high-power wind turbine.Secondly,the steady state,dynamic state and operation status of wind turbines are analyzed in detail,and the simulation strategies are proposed according to their characteristics.Aiming at the simulation of steady state characteristics of wind turbines,the control simulation strategy adopting the motor torque or the rotational speed output is proposed.For dynamic characteristics of wind turbine,the torque feedback based inertia compensation method is used to the simulate control method.For the operation state of the wind turbine,the simulation of the maximum power tracking operation is carried out.Thirdly,the simulation experimental platform of wind turbine is developed.According to the proposed mathematical model and simulation strategy of the wind turbine,the monitoring system of the platform is programmed on Labview.In order to improve the human-computer interaction for this system,the three-dimensional display module of wind turbine is developed.For the control system,the inverter is used to control the three-phase asynchronnous motor-tow producing power in need.Considering the offset between control instruction and the real output power,energy and control error compensation method is proposed to improve the simulation accuracy.On the other hand,in order to improve the character of real-time for the whole system,the CANopen communication techonology is designed.At last,the simulation experiments are used to verify the simulating strategy and the established simulation test platform.On the basis of the original simulation platform,the function of dynamic loading has been developed and tested.