一种变速风力机全风速范围发电策略

由于风力机系统复杂的机械阻尼和大惯量等强非线性因素的存在,增大了控制策略设计与实现的难度。同时,对于变速风力发电系统而言,风力机的转速控制器设计是实现发电控制策略的重要环节。本文首先分析了定桨距变速风力机全风速段的发电策略,针对传统方案所存在的问题,提出了新型的控制策略,该策略在不同运行状态之间的过渡过程迅速平滑,有效降低了系统的动态载荷;其次,基于现有的风力发电系统分析了定桨距风力机的小信号模型,推导了风力机系统的传递函数,并为转速控制环设计了P ID控制器;最后,通过仿真和实验,验证了全风速段发电策略的可行性和有效性。

Full Range Control Strategy of Variable-Speed Wind Turbines

The turbine speed loop adjustment is a key link of the designing of the controller for the fixed pitch variable speed wind energy conversion system(WECS).Because of the strong nonlinear,big inertia and mechanical damping characteristics,it is difficult to design the controller of the wind power systems.A control strategy for variable-speed wind power conversion system is proposed,which can reach the maximum power point or keep the rotating speed constant when wind speed is under the rated value,and keep the rated output power above the rated wind speed.Then,a small signal model is presented,and a wind turbine speed loop regulator is designed.Finally, simulation system is built,and the results of the simulation and experiments show that the performance of the controller algorithm meet the requirements of WECS without wind measurement.