Electrically excited synchronous machine has been widely used in hydroelectric power generation and thermal power penetration, and has draw much attention in wind power generation. Aiming at showing the application in wind power system, the mathematical model of the synchronous generator was developed in MT axis coordinate. A method of observing the air-gap flux based on the MT axis coordinate was introduced, which solved the DC offset and integrated error of conventional voltage model efficiently. The strategy of vector control was introduced in detail. The simulation model was developed in MATLAB/Simulink 7.11, and the result of the simulation shoded that in the condition of wind speed and torque variation, the proposed system could operated stable, and the flux observer was accurate enough, and the control was effective.%电励磁同步电机在水电、火电中已得到了广泛应用,在风力发电中的应用也逐步受到关注.针对电励磁同步电机在风电中的具体应用,建立了其在MT轴坐标系下的数学模型.详细介绍了一种采用MT轴系感应电势辨识磁链的方法,有效解决了传统电压模型中存在的积分零点漂移问题.基于MT轴系数学模型给出了详细的矢量控制策略.在MATLAB/Simulink 7.11环境下建立了电励磁同步电机和机侧变流器的仿真模型.仿真结果表明在风速和转矩变化的情况下,系统能够稳定运行,气隙磁链观测准确,控制效果良好.
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