A self-cascaded induction generator combined with a separately controlled inverter and a synchronous condenser

Induction generators have been regarded as energy-saving, small-scale energy-producing devices. The cage-rotor-type induction generator is unique in that its construction is simple yet sturdy. A major problem in the induction generator system, however, is the source of the reactive power. One solution to this problem is to use a synchronous condenser, as noted in the work of B.T. Ooi and R.A. David (1979). However, the Ooi induction generator system has brushes, thus requiring frequent maintenance. The Ooi induction generator system is examined, substituting a self-cascaded induction machine for the wound rotor induction machine in addressing the problem of the absence of brushes in the Ooi system. The frequency converter of the induction generator system comprises a rectifier and a separately controlled inverter. It was found that the theoretical value obtained by the quantitative analysis coincided with the experimental results. Thus, the Ooi induction generator system can be improved by including a brushless synchronous condenser and a self-cascaded induction machine.<>