Online Searching MTPA Control of Wound Rotor Start/Generator Drives Considering Cross-Coupling Effect

The cross-coupling effect is the most common phenomenon in the electric machinery operation, it has the influence on the machine efficiency and control scheme. However, the cross-coupling effect is ignored in the existing virtual signal injection (VSI) maximum torque per ampere (MTPA) control. In this paper, the online searching MTPA control based on VSI scheme for Integrated Starter/Generator (ISG) system considering the cross-coupling effects is proposed. For obtaining the accurate torque gradient with respect to the torque angle online, the torque equation in the existing VSI scheme is extended by the cross-coupling effect is proposed. A prototype is set up and experiments are carried out to verify effectiveness the proposed control scheme.

I. Introduction

With the development of More Electric Aircraft (MEA), the Integrated Starter/Generator (ISG) system based on an Electrically Excited Synchronous Machine (EESM) becomes more and more popular [1], due to merits of less weight and volume. Since the EESM has a high safety and low cost in maintenance, it becomes an attractive candidate for the ISG system [2]- [3].