A Direct-Flux-Vector-Controlled Induction Generator With Space-Vector Modulation for Integrated Starter Alternator

TLDR

The paper proposes a direct‑flux‑vector‑controlled induction generator scheme for future 42‑V automobile applications. The scheme uses a single PI controller to regulate the electromagnetic torque, linking stator flux vector speed to torque and maintaining the dc‑bus voltage within 42‑V specifications. Simulations and experiments show that space‑vector modulation yields fixed switching frequency, low torque ripple, and a practical alternative to field‑oriented control for integrated starter alternators.

Abstract

A direct-flux-vector-controlled scheme of induction generator has been proposed in this paper for future 42-V automobile application. The fundamental relationship between the rotating speed of the stator flux vector and torque is analyzed. A simple structure with only one proportional-integral (PI) controller is shown to implement the torque and flux controls adequately. By controlling the electromagnetic torque of the induction machine, the required dc-bus voltage can be well regulated within the 42-V PowerNet specifications. Fixed switching frequency and low torque ripple are obtained with space-vector modulation technique. Simulation and experimental results indicate that the proposed scheme provides a practical solution for an integrated starter alternator other than the widely applied field-oriented- control scheme.