Experimental Evaluation of Torque Performance of Voltage and Current Models using Measured Torque for Induction Motor Drives

Abstract

In this paper, two kinds of observers are proposed to investigate torque estimation. The first one is based on a voltage model represented with a lowpass filter (LPF); which is normally used as a replacement for a pure integrator to avoid integration drift problem due to dc offset or measurement error. The second estimator used is an extended Kalman filter (EKF) as a current model, which puts into account all noise problems. Both estimation algorithms are investigated during the steady and transient states, tested under light load, and then compared with the measured mechanical torque. In all conditions, it will be shown that the torque estimation error for EKF has remained within narrower error band and yielded minimum torque ripples when compared to LPF estimation. This motivates the use of EKF observer in high performance control drives of induction machines for achieving improved torque response.

Critical Condition of Sensorless Induction Generator Using Flux Weakening in Wind Turbine Application

“…The model of the mechanical wind turbine used six equations (1)(2)(3)(4)(5)(6). The equations was used to calculate the capacity factor of the wind turbine (C p ), the turbine speed ( wt ), the tip speed ratio (), the turbine power (P wt ), and the load torque (T L ) [2], [3]…”

“…The model of the induction generator used seven differential equations, i.e. the differential equation of the stator current in d-axis (i sd ) (7), the differential equation of the stator current in q-axis (i sq ) (8), the differential equation of the rotor current in d-axis (i rd ) (9), the differential equation of the rotor current in qaxis (i rq ) (10), the differential equation of the angular speed of the stator voltage ( e , the differential equation of the rotor speed ( r ) (12), and the differential equation of the angle of rotor (13) [4], [5].…”

Embedded System Practicum Module for Increase Student Comprehension of Microcontroller

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