直驱式永磁同步风力发电机中混沌运动的滑模变结构控制

摘要

以直驱式永磁同步风力发电机(D-PMSG)作为研究对象,推导了其数学模型,论证了在某些参数及工作条件下会出现混沌运动,提出了D-PMSG混沌运动的滑模变结构控制方法,通过控制桨距角β来实现.针对风力机系统的非线性,参数变化等特性,根据风力机机理,基于一定假设得到风力机在某一工况点线性模型,进而提出滑模变结构控制方案,充分利用变结构控制对被控对象的模型误差、对象参数的变化以及外部干扰有极佳的不敏感性的优点.仿真结果表明所提出控制方案的有效性,控制响应速度快,控制鲁棒性好,能适用于系统具有不确定性参数情形等优点.研究结果为直驱式风力发电系统的混沌控制应用提供了有价值的参考.%The directly driven wind turbine with permanent magnet synchronous generator (D-PMSG) is investigated. Its mathematical model is deduced and chaotic behaviors is demonstrated while its parameters have a certain range of values or under certain working conditions. A sliding mode variable structure method for controlling chaos in D-PMSG is presented, and realized through controlling pitch angleft. In view of the non-linear property and parameter changing characteristic, etc. for wind turbine, and based on the mechanism of the wind turbine, this paper obtained the wind turbine's linear model at a certain condition point under some assumptions, and then proposed the sliding model control strategy by taking full use of the SMC's non-sensitivity merit towards the model error and the parameter change as well as exterior disturbance, the simulation result indicates that the proposed control plan is effective, the control property of response is obtained quickly and the system also has good robustness, and is suitable for uncertain parameter in the system. Research results may have value for D-PMSG chaos control.