一、引言同步电机的扭转角——所产生的电动势(EMF)与湍电压之间的相位角——是机器性能的重要参数。与扭转角成比例的电信号可用于测量或实现自动化控制。随着电力系统趋向“在线”数字化控制,有必要以数字形式来获得同步电机的输出量。同时,数字技术的发展 I. INTRODUCTION The torsion angle of a synchronous machine - the phase angle between the generated electromotive force (EMF) and the turbulent voltage - is an important parameter of machine performance. The electrical signal proportional to the twist angle can be used to measure or to automate the control. As power systems tend to “digitize” online, it is necessary to obtain the output of the synchronous machine in digital form. At the same time, the development of digital technology