双馈风力机转子动能在系统频率跌落时的响应能力分析

摘要

针对转子动能参与调频的研究主要集中于控制策略上,并未详细、定量研究不同工况下转子释放动能的问题,以1.5 MW某双馈风力发电机为原型、采用Matlab/Simulink软件建立了简化的风力机动态模型,并以1.5 MW风力发电机的实时运行数据验证了该模型的正确性;同时,提出了转子释能持续时间的概念,并在所建的风力机动态模型下得到中低风速(6～8 m/s)下机组转子释放动能的能力随着风速的变化,继而设计了转子惯性响应控制器,研究了不同风速下风力机在系统频率跌落时的响应能力,得到转速及功率输出的响应曲线.研究结果表明:所提模型具有普遍的适用性;在相应研究条件下,风力机转子释能时间可达15 s,风力机输出可增加约15％的有功功率;风速在6～8 m/s下,风电机组转子释放动能的能力随着风速的增加而降低.该结果可为双馈感应风力发电机参与电网调频的研究提供参考.%Studies of rotor kinetic energy participating in frequency regulation are mainly focused on the control strategies,and less attention is paid on the ability of rotor releasing kinetic energy under different working conditions.A simplified dynamic simulation model of a 1.5 MW doublyfed induction wind turbine generator (DFIG) was established with Matlab/Simulink,and verified by the operating data of a 1.5 MW wind turbine generator.The duration time was proposed and the variation of the ability of rotor releasing kinetic energy was obtained in a low and middle speed region (6-8 m/s).Then a rotor inertial response controller was designed.The dynamic responses under different wind speed conditions were investigated as the system frequency falls,and the response curves of revolving speed and active power were completed.The results show the general applicability of this model.The time of rotor releasing energy reaches up to 15 s,and the active power increases by 15％.The ability of rotor releasing kinetic energy decreases with the increasing wind speed from 6 m/s to 8 m/s.