Abstract
Micro turbine based generator systems are becoming popular forproviding electric power and heat in a cogeneration environment. Thereason for this is the fact that the high-speed turbo-generator sets arevery compact in size and are competitive in the cogeneration environ-ment. The electric generator is directly coupled to the high-speed turbineand must be capable of operating at the high speed. The typical microand mini turbine speeds are in the range of 30,000 rpm to 120,000 rpm.The higher the power, lower is the speed. Thus a 40-kW micro turbine-generator may operate at 120,000 rpm, while a 500-kW mini-turbine mayoperate at 30,000 rpm.This article addresses a 200 kW, 60,000 rpm generator and control-ler suitable for direct coupling to a turbine. Many of the micropowerunits available in the market use permanent magnet generators. In thedesign presented here, induction generator technology is applied. It isbelieved that induction generators offer benefits such as lower cost,higher cycle efficiency, and safety of operation
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