风电叶片两点疲劳加载控制系统设计及验证

Design and Verification of Dual-Exciters Fatigue Loading Control System for Wind Turbine Blades

针对目前风电叶片单点疲劳加载系统存在弯矩分布精度误差较大以及系统驱动能力不足的问题,首次提出了两点疲劳加载新方法。然而基于叶片柔性连接且非共面的两个加载源之间存在空间耦合,导致两者振动不同步,因此,对两点疲劳加载控制系统进行了研究。控制系统采用上位机—主控制器—从控制器—执行装置的网络构架模式。主、从控制器为西门子S7-200PLC,通过虚拟仪器软件LabVIEW进行数据采集以及现场监控;为使两加载源转速和相位均同步,采用基于变增益交叉耦合控制器的速度并行控制算法和PID相位控制,增强了系统的抗干扰性。最后,将设计的控制系统应用于某小型风电叶片的疲劳试验,试验结果表明该系统控制效果良好且稳定,并可缩短试验周期。

Aiming at the problems of the big moment distribution precision error and the shortage of the system driving ability in the single--exciter fatigne loading system, a new method of dual--exciters fatigue loading system for wind turbine blades wos proposed for the first time. Spatial coupling between the two loading sources which are noncoplanar and flexible connection based on the blade led the both to vibrate asynchronously, so dual--exciters fatigue loading control system was studied. The control system used the network framework model of PC-the master controller-the controller the executive device. The master, slave controllers are SIEMENS S7-200PLC, and the software of virtual instrument LabVIEW is used to develop the platform of data acquisition and field monitoring; in order to make the speed and phase of two loading sources synchronous, the methods of speed parallel control based on variable gain cross-coupling controller and PID phase control were used, which can enhance the anti-intelferenee of the system. Finally, fatigue tests were carried out on a certain small blade using the designed control system, the results showed that the control performance and stability of the system are good, and the test period can be shortened.