摘要
定桨距变速风力发电机组具有结构简单、成本低以及可靠性高等优点,在中小功率风力发电中具有较好的市场和应用前景。但是,系统的控制,尤其是额定风速以上的恒功率控制,实现却非常困难,目前还鲜有相关文献的报道。本文提出了一种适用于定桨距变速永磁同步风力发电机组额定风速以上的恒功率软失速控制策略,提出在额定风速以上时,通过控制发电机的输出电功率使风力机工作于失速区,实现了机组的恒功率运行。该控制策略不仅具有结构简单易实现、额定风速以上的恒功率运行功率脉动小,实现了软失速运行的优点,而且控制是基于直流侧的电压和电流信号的检测而避免了检测风速以及发电机的转速信号,降低了控制成本。为了验证文中提出控制策略的正确性,运用Matlab/Simulink搭建了仿真模型并在实验室建立了一台额定功率1.2kW的定桨距变速风力发电机组的实验平台。仿真和实验验证了文中所提出方法的正确性。
Fixed-pitch variable-speed wind turbines have good prospects in small and medium scale wind power market due to its advantages of simple structure,low cost and high reliability.However,the system control,especially the constant power control in high wind velocity regime is hard to realize and rarely reported in literatures till now.In this paper,a constant-power soft-stall control strategy is proposed which claims to increase the electrical power of the generator to force the wind turbine work in the stall regime thus to decrease the power coefficient of the turbine and achieve constant power operation.The control strategy is based on neither the wind velocity nor the rotational speed of the turbine but the voltage and current signals of the DC bus.Consequently,the control cost is greatly reduced.To verify the correctness of proposed control strategy,both a simulation model based on Matlab/ Simulink and a laboratory prototype of a fixed-pitch variable-speed wind turbine with the power rating of 1.2kW are established.Simulation and experimental results support the theoretical analyses very well.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第1期149-157,共9页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划资助项目(2007CB210303)
关键词
风力发电
恒功率
软失速
动态载荷
无传感器
Wind power generation,constant power,soft stall,aerodynamic load,sensorless
