Research on the modified Extended Luenberger Observer for current sensor fault-tolerant control of the induction motor drive

These research results concern the concept of applying the Extended Luenberger Observer (ELO) with additional estimation of rotor resistance for the implementation of the current sensor (CS) fault-tolerant control of induction motor drive. Additionally, a modification of the ELO has been implemented to enhance the quality of the stator current estimation, even in the case of a faulty CS. The study investigates the quality of stator current estimation in the absence of faults or in the case of a fault occurring in one of the two CSS. The simulation results confirm the high effectiveness of the proposed solution on a wide range of speed variations.

The data used in this research are attached and contain the transient signals obtained from simulations described as follows:

Description of the file notation:

mea - measured values

real - ideal values (without measurement noise)

emlo - values estimated by the EMLO estimator

c - values used in the control structure and observer, calculated based on measured and estimated values

ref - reference values

IM - values in the induction motor model

H - both sensors intact

A/B - damaged sensor in a given phase

M - motoring operation mode

R - regenerating operation mode

m100 - load torque value [%]

w100 - speed reference value [%]

k180 - wsp k0 = 1.8