变速风力发电机组的自适应滑模变桨距控制

Adaptive Sliding Mode Pitch Control of Variable-speed Wind Turbines

在风力发电系统稳定性优化控制的研究中,针对不确定性的变速风力发电机组的变桨距控制方式系统稳定性差的问题,提出了一种自适应全局快速Terminal滑模控制方法。建立变桨距风力发电机组动力学模型,针对模型中的未知环节,设计了自适应模糊逼近系统。采用由Terminal滑动模态和线性滑动模态组成的滑模模态,采用了自适应Terminal滑模变桨距控制器。根据Lyapunov稳定性理论证明了系统稳定性,并给出了具体的自适应律和不确定项边界的估计算法。对自然风下的机组变桨距控制情况进行了仿真,结果表明系统稳定且输出功率平稳。

An adaptive global fast terminal sliding mode control method was proposed for the pitch control of vari- able - speed wind turbines with great uncertainties. The dynamics of the adjustable - pitch wind turbines was mod- eled. An adaptive fuzzy system was designed to approximate the unknown terms in the model. The sliding mode com- posed of terminal sliding mode and linear sliding mode was chosen and the adaptive terminal sliding mode pitch con- troller was proposed. By using Lyapunov stability theorem, the stability of the system was proved, the specific adap- tive law was determined and the estimation algorithm was designed to estimate the bound of system uncertainties. The case of the pitch control of the wind turbines operating under natural winds was simulated. The results verify that the system is stable and the output power is steady.