液力调速风电机组变速恒频双模控制

Dual-mode variable speed constant frequency control of wind turbines with hydrodynamic speed control

针对液力调速风电机组应用常规控制方法难以实现恒转速精确控制问题,提出了基于模糊PID控制的双模控制方法.根据液力调速系统的传动原理、设计参数和特性,建立了其动态数学模型,给出基于该传动方式的变速恒频(VSCF)控制方法.结合开环及闭环控制,设计了双模控制系统并给出了频率切换策略.以2MW风电机组为例,利用Matlab/Simulink对机组恒功率工况进行仿真分析.仿真结果表明:基于模糊PID控制的双模控制系统能够准确控制同步发电机恒转速,具有更高的控制精度.

Dual-mode control based on fuzzy PID（proportion-integral-derivative）control method was proposed to solve the problems of inaccurate constant speed control in wind turbines with hydrodynamic speed control by conventional control method.According to the transmission principle,design parameters and characteristic of hydrodynamic speed regulating system,the variable speed constant frequency（VSCF）control method was presented based on the establishment of its dynamic model.Combined with the open-loop and closed-loop control,the dual-mode control was designed,and the frequency switching strategy was given.A simulation of Matlab/Simulink was conducted on a 2 MW wind turbine.The simulation results validate that the constant rotation speed of the synchronous generator can be controlled accurately by the dual-mode control system based on fuzzy PID control method,which has higher control accuracy.