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Publication Title | *ADVANCED ELECTRIC GENERATOR & CONTROL FOR HIGH SPEED MICRO/MINI TURBINE BASED POWER SYSTEMS

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Text | *ADVANCED ELECTRIC GENERATOR & CONTROL FOR HIGH SPEED MICRO/MINI TURBINE BASED POWER SYSTEMS | 001



*ADVANCED ELECTRIC GENERATOR & CONTROL

FOR

HIGH SPEED MICRO/MINI TURBINE BASED POWER SYSTEMS

Jay Vaidya, President Electrodynamics Associates, Inc. 409 Eastbridge Drive, Oviedo, FL 32765

and

Earl Gregory, Power Generation, Propulsion Directorate AFRL/PRPG, Wright-Patterson AFB, OH 45433

INTRODUCTION

*Patent Pending

High-speed micro-turbines and mini-turbines play a significant role in the Distributed Power Systems that provide dependable electric power close to the user. Several high-speed turbo-generators manufactured by various corporations are now available in the 30 kW to 90 kW range. These systems operate at speeds from 50000 RPM to 120000 RPM. The generator is directly coupled to the turbine shaft. This obviates the need for a gearbox, helps reduce the size of the generator, and lowers the cost of the overall system. The output power is electronically processed and conditioned to provide constant voltage dc or multi-phase ac power at constant frequency.

Technology of micro-turbines is moving forward to address ratings above 100 kW due to the growing demand for larger units. There is a tendency to use multiple units of the existing 30 to 90 kW packages to satisfy this demand for higher power capacity. However, use of turbo- generators of higher ratings is likely to be beneficial to the user for the following reasons:

a) lower cost of investment per kW for purchase and installation

b) lower cost of maintenance because of reduced parts count

c) higher efficiency

d) safer operation.

At the present time most generators used with micro-turbines are based on permanent magnet technology. It is the objective of this paper to compare alternatives to the PM generator technology, and introduce induction generator technology as a more viable alternative in the power range exceeding 100 kW. The approach in this paper is to present the concept in all its dimensions including the issues of generator and controller design. The authors are currently engaged in the development of the high-speed induction generator systems. Their experience in the field of the technology forms the basis supporting the discussions in this paper.

SYSTEM DEFINITION AND CONSTRAINTS

It is realized that one specific technology does not necessarily provide the best answer under all situations. We must therefore limit our discussions to applications within certain constraints. At this time the following broad limits are applicable for the technology under consideration:

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