Abstract

Induction generators are widely used in applications such as renewable energy systems, more electric aircrafts, and electric vehicles. In electric vehicles, more electric aircrafts, micro/mini wind turbines etc, induction machines can be used to supply power to auxiliary electric loads. In this paper, a scheme is proposed to simultaneously supply AC as well as DC power to auxiliary loads (from both AC side and DC link) by connecting the induction machine in an open-end winding configuration. Conventional AC auxiliary loads are powered from energy storage units such as batteries, whereas the proposed scheme does not consume power from the battery during normal operation, thereby preventing the power loss due to charging/discharging of the batteries. Voltage source inverter (VSI) is operated as a compensator whose modulating signal is used to control the active and reactive power in the system. The proposed scheme is based on scalar control of the machine, making it a simple and robust method to generate controllable AC load voltage and controllable DC link voltage with no additional system components. The proposed control scheme has been simulated in MATLAB/SIMULINK and experimentally validated.

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