直驱永磁同步风力发电机单位功率因数控制

Unity power factor control of a direct-driven permanent magnet synchronous wind-power generator

针对采用传统矢量控制的直驱永磁同步风力发电机存在电机运行功率因数降低的问题,提出一种适用于采用双脉宽调制变换器并网的永磁同步发电机单位功率因数运行控制策略。所提方案在实现永磁直驱风电系统最大风能捕获控制的基础上,通过控制电机侧变换器使电机d轴控制电压为零来实现永磁同步发电机的单位功率因数运行控制。系统仿真和实验结果表明:采用所提运行控制策略可有效实现永磁同步发电机的单位功率因数运行,有助于减小电机侧变换器的运行容量,同时该发电系统可实现最大风能跟踪控制、并网有功和无功功率独立控制以及变速恒频发电运行。

The power factor of a direct-driven permanent magnet synchronous wind-power generator is re-duced with the traditional vector control strategy.A unity power factor operation control strategy for the permanent magnet synchronous generator（PMSG） with a back-to-back pulse-width modulation（PWM） converter was proposed.Based on the maximum wind-energy capture control of the PMSG,the unity pow-er factor operation of PMSG was realized by controlling the d-axis control voltage to zero in the generator-side converter.The correctness of the proposed control strategy was validated by the system simulation and experiment results,and the operation capacity of the generator-side converter can be effectively re-duced.Furthermore,the maximum wind-energy tracking control,independent control of active and reac-tive power transmitted to power grid as well as the variable speed constant frequency（VSCF） power gen-eration can also be implemented.