风力机组电动变桨系统

摘要

At present,electrical pitch control system is used in most of new wind turbine instead of hydraulic pitch control system.It decides the value of the wind power directly which functions as the power control and the safety control and plays an important role in the safe operation.The architecture and technical requirements of electrical pitch control system are first described, and the functions and the characteristic of pitch controller,standby power supply,motor and motor driver in pitch system are analyzed.Standby power supplies with different electrical storage component,different motors and motor drivers with different control loop are described also.At last,the trends of elec trical pitch control system are analyzed.%目前,电动变桨系统已取代液压变桨系统并被大多数风力机组采用.电动变桨系统作为风力机组功率控制和安全运行的重要执行结构,直接决定风力机组吸收的风能的大小,对于机组的安全稳定运行发挥着重要作用.此处介绍了电动变桨系统的电气结构和运动控制技术要求,分析了系统中变桨控制器、备用电源、变桨电机和伺服驱动器4大部件的功能、特点及设计中需要注意的问题.详细介绍了备用电源不同储能元件的方案,不同种类变桨电机的特点及其适用场合,伺服驱动器的不同设计方案,并分别做了比较分析.最后展望了电动变桨系统的发展方向.