Back-to-back converter state-feedback control of DFIG (doubly-fed induction generator)-based wind turbines
Back-to-back converter state-feedback control of DFIG (doubly-fed induction generator)-based wind turbines
复制标题
DOI：
10.1016/j.energy.2015.06.027
复制
发表时间：
2015-09
期刊：
影响因子：
9
通讯作者：
F. E. Taveiros;L. S. Barros;F. Costa
中科院分区：
文献类型：
--
作者：
F. E. Taveiros;L. S. Barros;F. Costa
双馈感应发电机的控制传统上是基于PI（比例积分）控制器，最近许多论文提出了基于滑模的控制器。然而，这种控制器可能由于抖振而激发未建模的高频系统瞬态，导致振荡甚至不可预见的不稳定。为了克服这些缺点，本文提出了一种内模状态反馈控制策略，用于风驱动DFIG的转子直流电流和正交电流的调节，既能保持经典PI控制器控制信号的平滑，又能对外界干扰具有鲁棒性。控制电流以实现对电网的无功支持和最大功率点跟踪。将所提出的状态反馈控制策略与经典的PI和变结构模型参考自适应控制（VS-MRAC）滑模控制策略离散化，并在数字信号处理器中实现，与基于dfg的风能转换系统的实时数字仿真进行交互。所提出的控制结构在不增加变流器压力和降低电能质量的情况下，实现了最快和最鲁棒的动态响应。
Control of DFIG (doubly-fed induction generator) is traditionally based on PI (proportional-integral) controllers and recently many papers have proposed sliding-mode based controllers. However, such controllers may excite unmodeled high-frequency system transients due to chattering, resulting in oscillations or even in unforeseen instability. In order to overcome these drawbacks, this paper proposes a internal model state-feedback control strategy for regulation of rotor direct and quadrature currents for wind driven DFIG, which can keep the smooth control signal of the classical PI controller and, at the same time, provides robustness to external disturbances. The currents are controlled in order to accomplish reactive power support to the grid and MPPT (maximum power point tracking). The proposed state-feedback control strategy as well as the classical PI and the VS-MRAC (variable-structure model reference adaptive control) sliding-mode strategy were discretized and implemented in a digital signal processor in order to interact with a real-time digital simulation of the DFIG-based wind energy conversion system. The proposed control structure achieved the fastest and the most robust dynamic response without stressing the converters or deteriorating the power quality.