大功率直驱风力发电系统直流侧电压复合控制策略

Compound control strategy of DC-link voltage stability for high power direct-drive wind generation system

在开发大功率直驱型风力发电双脉宽调制(PWM)变流器的过程中,为有效抑制由于电机侧有功功率及电网电压的突变而导致的直流侧电压的大幅波动,提出了一种闭环控制与前馈控制相结合的直流侧电压复合控制策略,即在电流控制环中引入机侧有功功率和电网电压前馈控制。仿真实验有效验证了该方法的可行性。研究结果表明,这种控制策略与传统单纯的直流侧电压闭环控制相比,有更快的响应速度和更强的抗扰性能,有效地提高了系统的鲁棒性。

During developing dual pulse width modulation（PWM） converters for high power direct-drive wind generation, in order to effectively restrain the sharp fluctuation of DC-link voltage caused by the drastic changes of generator active power and the grid voltage, a compound control strategy of DC-link voltage stability which combined close-loop control with feed forward control was proposed. In this control, the generator-side active power and grid voltage feed forward control was introduced in the current control loop, which was verified by the simulation. The research results show that the proposed control strategy has faster response speed and stronger immunity, compared with the conventional single close-loop control.