Starter/generator employing resonant-converter-fed induction machine - Part II: Hardware prototype

Feasibility of operation of a new procedure to start a jet engine (JE) and to generate power by means of a single induction machine (IM) directly coup led to the turbine has been shown by means of a hardware prototype. An intr oduction, background, operation principle of this type of a system and soft ware simulation portion was presented in Part I of this article. Both in so ftware simulation and in the experimental phase of the studies the JE is re placed by a de machine. The de machine is brought to an initial speed by th e motoring operation of the IRI. Later, the IM is taken into generating mod e and the de machine is into motoring mode of operation, This mode would co rrespond to the turbine catch-up initiation phase and initiate driving phas e of the induction generator (IG) in the actual world, The generated power is then converted to a three-phase 3 empty set, 400 Hz tin software), 60 Hz tin hardware), 115 V voltage-regulated bus via a double stage power conver sion utilizing a 20 kHz parallel resonant high frequency (HF) ac link and p ulse density modulated (PDM) converter technology. Independent of the coupl ed machine speed, a constant amplitude and constant frequency 3 empty set v oltage-regulated ac bus is formed and maintained by the proper control of t he power converters.