一种改善串级调速系统功率因数的有效方法

A Method of Improving the Power Factor in the Static Scherbius System

绕线式异步电动机串级调速是一种高效、经济的调速方法．它可以将转差功率回馈至电网或送至电动机轴上，而且结构简单，可靠性高．串级调速系统的结构又决定它自身的功率因数较低，影响串调系统的应用．采用逆变器的不对称控制可以改善功率因数，提高系统的能量指标．

The static scherbius system is one kind of economic high efficient speed regulation system .It can feed back the turn speed deviation power to the electric network or to the electrical machinery. The construction of the system has lower power factor and this limits its use. Using the unsymmetrical control can improve the power factor of the system.