基于非线性观测器的DFIG直接功率控制

Direct Power Control of DFIG Based on Nonlinear State Observer

与传统的双馈感应发电机矢量控制方法相比,直接功率控制可简化控制器结构,提高系统的鲁棒性。文中提出基于非线性状态观测器的直接功率控制策略,并引入跟踪微分器以改善系统的动态性能,解决传统直接功率控制系统中快速性与超调量间的矛盾。理论分析与仿真实验表明基于非线性观测器的DFIG直接功率控制能够实现快速无超调控制,同时减小动态过程中有功功率和无功功率的相互影响。

Compared to traditional vector control methods of doubly-fed induction generator, the direct power control can simplify the structure of controller and improve the robustness of the system. A new direct power control strategy based on the nonlinear state observer is proposed. The tracking-differentiator to improve dynamic performance of the system is introduced, which can solve the contradictory between overshoot and rapidity of traditional direct power control methods. Theoretical analysis and simulation results validate that direct power control of DFIG based on the nonlinear state observer can achieve fast control without overshoot and reduce the influence between active power and reactive power during dynatnic process.