PMSG额定风速以上恒功率多指标非线性控制

Multi-index Nonlinear Control of Constant Power Output for the Permanent Magnet Wind Turbine Generation

讨论了直驱永磁风力发电机组(permanent magnet wind generatation,PMSG)在额定风速以上时的非线性控制问题。传统的控制方法是采用变桨距风力发电机组或者是调节电磁转矩来达到功率平滑的目的。上述两种控制方法都考虑了风电系统高风速区域时的功率限制策略,但是对系统的转速控制则没有考虑。为了有效减小风电系统高风速区域下的功率和转速波动,在建立风力发电系统非线性数学模型的基础上,利用基于微分几何状态反馈线性化的方法,设计了新的控制策略,即通过同时调节桨距角和电磁转矩来实现风电系统的功率和转速稳定的多目标控制策略,并且仿真验证了该控制策略的正确性和有效性。

This paper discusses direct drive permanent magnet wind generatation （ PMSG）＇ S nonlinear control problem above the rated wind. The traditional control method is using variable pitch wind turbines or regulating the electromagnet- ic torque to smooth power. Both of the two control methods considered the problem of power limitation, but the speed con- trol is ignored. In order to effectively reduce the fluctuation of power and speed during the high wind speed region, this paper based on the established nonlinear mathematical model for the wind system, takes advantage of the differential ge- ometry state feedback linearization, designes a new control strategy, that is, through adjust pitch Angle and electromagnet- ic torque at the same time to realize power and speed＇s stability which is the heart of the multi-objective control strategy, Simulation results show that this control strategy is correct and effective.