双馈风力发电系统最大风能追踪滑模变结构控制

Sliding-mode control of maximum power-point tracking in wind-power system for doubly-fed induction generator

针对如何实现双馈风力发电机最大风能追踪(MPPT)问题,本文采用滑模变结构控制原理和定子磁场定向矢量控制原理,提出了滑模控制的最大风能追踪方案.为此首先简要的介绍了定子磁场定向矢量控制的原理,然后根据风机模型的非线性提出了滑模控制最大风能追踪方案.此方法实现了双馈风力发电机的有功,无功功率的解耦控制.提高风力发电系统转速控制的抗干扰性,实现了变速恒频控制和最大功率点跟踪的快速和稳定控制,从而捕获更多的风能.最后仿真结果验证本文提出的控制策略的正确性和有效性.

The maximum power-point tracking（MPPT） plays an important role in the wind power system for doublyfed induction generator（DFIG）. A sliding mode control（SMC） strategy is proposed based on the theory of SMC and the control principle of the stator magnetic field orientation vector. The principle of stator magnetic field orientation vector control is briefly introduced, and then, an SMC control strategy is propose to realize the decoupling between the active power and the reactive power in DFIG, and carries out the MPPT control. It improves the rate of tracking and enhances the system stability, while capturing more wind energy and realizing the variable-speed-constant-frequency（VSCF） control. Simulation results of controller verified the accuracy and effectiveness of the proposed control strategy.