Induction-generator/synchronous-condenser system for wind-turbine power

A novel wind-turbine-driven electric power system for isolated communities is described. The system components consist of an induction generator and a synchronous condenser. The synchronous condenser supplies the magnetisation current to the induction generator. Besides supplying the load power, the induction generator feeds the synchronous condenser with real power to replenish windage, friction and I2R losses to sustain it at synchronous speed. The theory of operation is given, and predictions based on it are experimentally verified. The controllers required to maintain regulated voltage and frequency in spite of load and wind velocity changes are investigated. Slip-energy recovery is involved, and preliminary test results are presented.