On the Choice of Phase-Balancer Capacitance for Induction Motors Fed from Single-Phase Supply

Abstract

1.

A simple passive voltage-balancing scheme for three-phase induction generators interfaced with single-phase grids in micro hydroelectric systems

“…The subject matter has been extensively discussed in the literature [2][3][4][5][6][7], with the main goal having been to provide a balanced three-phase excitation for the stator windings of the machine.…”

“…The most widely adopted voltage-balancing technique is to connect a capacitor, referred hereafter to as the voltage-balancing capacitor, across two of the stator terminals [2]. It can be shown that the most balanced three-phase voltage is achieved with a unique capacitance, referred (in [2]) to as the optimum capacitance.…”

“…It can be shown that the most balanced three-phase voltage is achieved with a unique capacitance, referred (in [2]) to as the optimum capacitance. Based on the aforementioned approach, however, the voltage balance depends on the slip.…”

“…As Fig. 2 shows, two of the stator terminals are connected to the two power supply lines, while the third stator terminal is connected to one of the other two phases via a ''voltage-balancing'' capacitor [2]. Hereafter, the configuration of Fig.…”

“…The machine, however, may be connected to a single-phase power line, as the only available utility grid in most remote areas. Thus, this paper concentrates on the connection of the three-phase induction machine to a single-phase power supply.The subject matter has been extensively discussed in the literature [2][3][4][5][6][7], with the main goal having been to provide a balanced three-phase excitation for the stator windings of the machine.The most widely adopted voltage-balancing technique is to connect a capacitor, referred hereafter to as the voltage-balancing capacitor, across two of the stator terminals [2]. It can be shown that the most balanced three-phase voltage is achieved with a unique capacitance, referred (in [2]) to as the optimum capacitance.…”