Study On Doubly-fed Wind Generator Parameter Identification

Wind power generator in the system is the more important part of the system, in recent years development up of high performance generator control technology, such as:vector control technology, direct torque control, speed sensor and control technology, to a large extent, improve the control performance of the motor, but these high-performance motor control methods mostly need a more precise motor parameters, some of the wind turbine control algorithms to a certain extent also depends on accurate motor parameters. In order to obtain high-performance control effect, studying on the motor parameters and parameter calculation is necessary, double-fed motor parameters are changed, the motor parameters as temperature、 frequency change or magnetic saturation and other reasons to change. In order to obtain the double-fed motor parameters under different voltage conditions, the paper first use of doubly-fed machine drop model deduced the double-fed motor voltage drop the mathematical expression of the instantaneous current state of the stator side, and using the least square method to identify the motor parameters.The motor parameter identification, not only a theoretical problem but also an engineering problem, has an important role in motor control. Doubly fed induction generator cannot live without the mathematical model, described in detail in the mathematical model of the doubly-fed generator rotating coordinate system and the mathematical model in the stationary coordinate, and based on a mathematical model in the rotating coordinate system, on the double fed motor vector control methods. In addition, the least squares method, the article also carried out a detailed interpretation to provide a theoretical basis for the double-fed motor parameter identification.Several major factor of the impact of changes in motor parameters, including saturation factors, temperature factors, stray loss factors. The rotor changes, the mutual inductance change of doubly-fed machine electromagnetic torque, to clarify the importance of the double-fed motor parameter identification of the motor control. In addition, the use and significance of motor parameter identification is described, indicating the need for the identification of motor parameters. Voltage drop as a doubly-fed machine running in a common fault, the voltage drop state of the doubly-fed machine parameter identification has some practical significance, using the recursive least squares method to the doubly-fed wind generator parameter identification. In order to prove the validity and authenticity of the methods described. To prove the validity of the parameter identification method for simulation, using the motor parameters of the real motor, and testing on doubly-fed machine test stand, the test proved the necessity and authenticity of the doubly-fed machine parameter identification.