Improved Stator Flux Estimation in Sensorless AC Motor Drives Using Extented SOGI

This paper presents extended second-order generalized integrator (SOGI) application for stator flux estimation in sensorless AC motor drives. The proposed technique is based on the SOGI algorithm, which has been used for orthogonal signal generation and stator flux estimation. In this study, the extended SOGI is employed to enable tuning of higher stator flux estimator bandwidths compared to existing conventional SOGI-based solutions. The extended SOGI algorithm utilizes observer-based structure, to enhance the speed of the flux estimation. The performance of the proposed method is compared with the conventional SOGI approach. The new estimator is tested through a set of open-loop simulation tests. The proposed technique has the potential to improve a wide range of AC motor applications, such as electric vehicles and industrial automation systems, contributing to the development of more advanced AC motor control systems.