摘要
常规数字式编码器在风力发电中的应用存在容易受干扰等问题。在分析直驱型变速恒频风电系统背靠背变流器工作原理的基础上,采用锁相环无速度传感器控制策略对永磁同步发电机的速度和相位进行观测,对其工作原理和实现方法进行了分析。建立了永磁直驱风电系统仿真模型和实验样机,并对所提控制策略进行了仿真和实验验证。仿真与实验结果表明,锁相环无速度传感器控制能够准确获取电机转速与角度信息,响应速度快、电流控制效果好,具有较好的稳态与动态性能,经过进一步优化,特别是提高低速段性能后,可以在直驱风电系统中替代常规编码器实现对永磁同步发电机的控制。
Conventional digital encoder applied in wind energy conversion system (WECS) may be susceptible to interference and poor environment. Based on analysis to the principle of back-to-back converter for direct-driven variable speed constout frequency(VSCF) WECS, phase lock loop(PLL) based sensorless control strategy was adopted to determine the speed and phase angle of PMSG, and its work principle and realization method are analyzed in detail. Simulation model and experimental prototype of direct- driven WECS were built, then the application of proposed control strategy was verified by simulation and experiment. The simulation and experimental results prove that the PLL based sensorless control can obtain accurate speed and phase angle information of PMSG, have fast response, good current control effect, and good steady-state and dynamic performances, may be used to substitute conventional eneoder to control the PMSG, by further improvement especially at low speed, for direct-driven WECS.
出处
《电机与控制学报》
EI
CSCD
北大核心
2009年第1期67-72,共6页
Electric Machines and Control
基金
中科院电工研究所所长基金(0710141CS1)
关键词
永磁同步发电机
直驱风电系统
无速度传感器控制
背靠背变流器
锁相环
permanent magnet synchronous generator
direct-driven wind energy conversion system
sensorless control
back-to-back converter
phase lock loop