Post-Fault Speed Sensor-Less Operation of Six-Phase Induction Motors

Abstract

Recently, high power drive applications imposed the researchers to investigate a several methods for electric power supply segmentation in order to respect the prescribed converter power limits. Multiphase machines are engaged in fierce competition with others conventional three phase machines especially in the industrial applications due to harmonics reduction, greater fault tolerance with better redundancy and performance. In addition, reliability is the main concern in the most of industrial applications. Therefore, studying the electrical drives behaviour during a fault condition is the key to ensure system sincerity. This study introduces a post-fault speed estimator for asymmetrical six-phase (6-ph) induction machines (IM) under single open phase condition. The proposed technique is based on Kalman Filter (KF) estimator. The multiphase machine model scheme is associated with proportional integral (PI) speed control. Also, the indirect field-oriented control (IFOC) is intended to be used and followed by a hysteresis current controller (HCC). Different operating conditions have been carried out to investigate the estimator fidelity. The simulation study is performed using MATLAB / SIMULINK platform. The simulations results show a promising performance of the proposed speed estimator.

Keywords: Asymmetric six phases, multiphase machine, Kalman filter, sensorless operation, speed estimation