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 coupled to the turbine has been shown by means of a hardware prototype. An introduction, background, operation principle of this type of a system and software simulation portion was presented in Part I of this article. Both in software simulation and in the experimental phase of the studies the JE is replaced by a dc machine. The dc machine is brought to an initial speed by the motoring operation of the IM. Later, the IM is taken into generating mode and the dc machine is into motoring mode of operation. This mode would correspond to the turbine catch-up initiation phase and initiate driving phase of the induction generator (IG) in the actual world. The generated power is then converted to a three-phase 3O, 400 Hz (in software), 60 Hz (in hardware), 115 V voltage-regulated bus via a double stage power conversion utilizing a 20 kHz parallel resonant high frequency (HF) ac link and pulse density modulated (PDM) converter technology. Independent of the coupled machine speed, a constant amplitude and constant frequency 3O voltage-regulated ac bus is formed and maintained by the proper control of the power converters.

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