无刷双馈风力发电系统双空间矢量调制矩阵变换器励磁控制

Exciting control of matrix converter with double space vector modulation for brushless doubly-fed wind generator system

矩阵变换器具有低频性能好、功率因数可调节、四象限运行等特点,以矩阵变换器为无刷双馈风力发电机的励磁控制器,可建立交流励磁变速恒频风力发电系统。采用双空间间接矢量控制策略控制矩阵变换器输出电流的幅值、频率、相位,从而调节发电机控制绕组电流的幅值、频率、相位,实现无刷双馈风力发电系统的变速恒频运行及功率因数控制。采用C语言编写数字信号处理器控制系统程序,实现双空间间接矢量调制策略,复杂可编程逻辑器件实现四步换流和产生双向开关矩阵控制信号。通过实际风力发电机组平台进行了相关试验,结果验证了控制方案的有效性。

The matrix converter（MC） can provide prefect low frequency performance, controllable input power factor, and four-quadrant operation. In order to achieve variable-speed constant-frequency（VSCF） wind power generation system, the MC was selected as an exciting controller for a brushless doubly-fed generator（BDFG）. The amplitude, frequency and phase of current of the BDFG control windings were changed by regulating the amplitude, frequency and phase of output current of the MC with double space vector modulation. Consequently, the VSCF operational mode and power factor of the generation system were controlled by the MC. The PWM drive signals were provided to the bi-direction switches of MC by DSP with double space-vector algorithm and by CPLD with four-step commutation. Basing on a practical prototype of wind power generation experimental platform, some experimentally studies had been made. As a result, the validity of control strategy was verified by the experiments conclusions.