大功率风力发电机在全工况下的独立变桨距控制策略研究

STRATEGIES STUDY OF INDIVIDUAL VARIABLE PITCH CONTROL FOR HIGH-POWER WIND TURBINES IN FULL LOAD CASES

研究在全工况下如何通过独立变桨距来减小机组关键零部件的疲劳载荷,考虑风剪造成的1 P不平衡载荷,采用LQR方法设计风力发电机的独立变桨距控制器,由于单纯采用基于状态空间的独立变桨距控制导致系统鲁棒性较差,因此引入带增益调度的统一变桨距控制,在统一变桨距的基础上附加独立变桨距。以5 MW变速变桨距风力发电机组为验证对象,基于NREL开发的FAST软件与Matlab 7.1/Simulink平台,在Simulink中实现风力发电机控制,并将控制信号返回FAST进行风力发电机的非线性仿真,在全工况下对独立变桨距控制策略与统一变桨距控制策略进行仿真验证。结果表明:相对统一变桨距控制,所提出的在全工况下带增益调度的独立变桨距控制,在保证额定转速下保持稳定的电功率输出的同时,能有效降低零部件疲劳载荷。

For large VSVP （variable speed variable pitch, VSVP） , according to 5 MW results researches on that significant reductions in fatigue loading on a wind turbine components can be achieved by using individual pitch control strategy in full load cases. To consider wind shear caused 1 P unbalanced load, the wind turbines using the LQR method designed independent pitch controller, since applying the individual pitch control merely based on LQR strategy leads to bad robustness of the system, it introduced gain-scheduled collective pitch controller to settle this issue, addition the independent pitch on the base of collective pitch. With a research object of 5 MW wind turbine, this control strategy was simulated on the NREL developed FAST software with Matlab 7.1/simulink of platform, implementing in wind turbines＇ control in Simulink, and nonlinear simulation of wind turbines after taking the control signal to FAST, comparing the simulation result of independent and collective pitch controll in full load-case. Simulation results of the proposed control strategy showed that compared with the traditional method of pitch control, the control with gain-scheduled in full load-case can maintain a better power components fatigue load. proposed strategy of independent pitch regulation at the rated speed and reduce