无刷双馈发电机及其控制策略的仿真研究

Simulation Research of Brushless Doubly-fed Generator and Its Control Strategy

给出了无刷双馈发电机的转子机械速dq0数学模型和定子同步速MT数学模型;提出了一种无刷双馈发电机空载并网控制策略,该策略根据定子同步坐标系下无刷双馈发电机有功功率、无功功率给定值,最终得出控制侧定子绕组的电压给定值,将该值进行2r/3s变换后输入SVPWM调制模块,得到的PWM信号用于控制机侧变流器开关管的通断,从而产生定子控制绕组所需的电压、电流;在Matlab/Simulink环境下搭建了无刷双馈发电机及其控制仿真模型,并对无刷双馈发电机在空载、并网状态下的动态性能进行了仿真研究。仿真结果验证了所搭建模型及空载并网控制策略的正确性、有效性。

A dqO model based on rotor mechanical velocity reference and a MT model based on stator synchronous velocity reference of brushless doubly-fed generator were gave and a grid control strategy without load of brushless doubly-fed generator was proposed. The basic idea of the control strategy is using the given value of active and reactive power of the generator under stator synchronous velocity reference to calculate given voltage of stator windings at the control side, then inputting the calculated result after 2r/3s transformation into SVPWM modulation model to generate PWM signal for controlling turn-on and turn-off of switching tube of converter at generator side so as to generate required voltage and current of stator control windings. Models of brushless doubly-fed generator and its control system were established in Matlab/Simulink software, and dynamic performances of the generator were simulated in cases of no load and grid. The simulation results verified correctness and effectiveness of the models and the control strategy.