Sensorless Control With Adaptive Speed Observer Using Power Winding Information for Dual-Stator Winding Induction Starter/Generator

This article presents a speed-senserless control strategy with an adaptive speed observer using power winding (PW) information for dual-stator winding induction starter/generator, in order to improve speed estimation precision and starting-generating performances. Based on the principle of model reference adaptive system, an improved rotor-flux-based reference model is proposed by utilizing the electromagnetic link between the control winding and PW, the PW voltages are used to estimate rotor flux without the necessity of stator resistance and filter parameters. The improved speed observer is less parameter-sensitive and can reduce the estimation error, especially in a low-speed starting process with the load. The parameter design method of the adaptive mechanism of the proposed speed observer based on stability analysis is also given. The distribution of dominant pole of the speed observer is modified to obtain good tracking ability. Based on the improved speed observer, a speed-sensorless starting-generating control strategy is investigated, in which the estimated speed is not only used in speed control in starting process but also in staring-to-generating switching process. The simulation and experimental results verify the validity of the proposed speed observer and the speed-sensorless control strategy.