基于定子电压定向的分频风电系统多机控制  

A Novel FFAC Multi-turbine Control Scheme Based on Stator Voltage Orientation

作　　者：陶伟龙 王锡凡[1] 宋卓彦[1] 孟永庆[1] 卫晓辉[1] 刘沈全 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《中国电机工程学报》2014年第31期5477-5484,共8页Proceedings of the CSEE

摘　　要：为提高中远距离风电传输的经济性,提出一种新型分频多机控制策略。该系统通过一台交交变频控制多台同步风力发电机运行,并实现风电变频、并网。由于系统内各机组具有相同的定子电压,而其转子磁链方向不同,所以采用基于定子电压定向的控制方法。此外,提出一种改进的多机频率寻优方法和一种基于瞬时无功原理的数字锁相技术。前者可提高分频系统风能捕捉率和运行的稳定性,后者可解决分频系统中电压锁相不准的问题。最后,利用PSCAD搭建了由4台同步风电机构成的分频多机系统,验证了上述控制方法的可行性。A novel fractional frequency multi-turbine （FFMT） control scheme was proposed for improving the economy of wind energy transmission of medium distance. In this system, an AC-AC converter was used to control the operation of clusters of synchronous wind generators and transmit the power to the grid. The stator voltage orientation was adopted because all the generators have the same stator voltage vector while rotor filed orientations of them are various. In addition, an improved multi-turbine frequency optimization and an instantaneous reactive power based digital phase-locked loop （PLL） were adopted. The former raised the wind energy capture and improved the stability of the system, while the latter addressed the difficulty of stator voltage orientation. Finally, the proposed scheme was validated by simulations on a wind farm composed of four wind generators.

关 键 词：分频输电 多机控制 多机频率寻优 数字锁相环 风力发电 

分 类 号：TM72[电气工程—电力系统及自动化]