基于新型幂次趋近律的DFIG滑模直接功率控制

DFIG Sliding Mode Direct Power Control Based on Novel Power Reaching Law

针对采用PI控制时双馈风力发电系统在参数摄动情况下控制性能不佳及传统趋近律滑模控制存在抖振等问题,提出一种基于新型幂次趋近律的双馈风力发电机(Doubly-Fed Induction Generator,DFIG)滑模直接功率控制策略。首先建立DFIG的数学模型,然后针对滑模控制存在的抖振问题提出一种新型幂次趋近律,该趋近律可随着系统状态位置的变化自动调整趋近速度,使系统状态量平滑地进入滑模面,从而减小抖振。最后将此趋近律应用于DFIG滑模直接功率控制系统中。仿真结果表明提出的新型幂次趋近律滑模控制策略能够有效地降低系统抖振,增强系统鲁棒性。

A new power convergence law based sliding mode direct power control strategy for Doubly-Fed Induction Generator(DFIG)is proposed to address the problems of poor control performance and jitter in the traditional convergence law sliding mode control of doubly-fed wind power generation system with PI control.First,the mathematical model of DFIG was established.Then,a novel power approximation law is proposed for the jitter problem of sliding mode control,which can automatically adjust the approach speed with the change of the system state position,so that the system state quantity smoothly enters the sliding mode surface,thereby reducing the jitter.Finally,this approximation law is applied to the DFIG sliding mode direct power control system.The simulation results show that the proposed novel power approximation law sliding mode control strategy can effectively reduce the system jitter and enhance the system robustness.