Abstract
This paper presents a modified sliding mode state observer for sensorless vector-controlled induction motor drive. The objective is to improve the dynamic performance of the sensorless drive subjected to parameter uncertainty, fault and disturbances. The sensorless drive along with the proposed observer is modeled and built in Simulink, and the dynamic behavior is obtained for different test cases such as flux-weakening region, variations in commanded speed and torque, low-speed operation and under faulty operation mode subjected to an electrical fault in the inverter. The conventional disturbance rejection mechanism is modified by constraining the estimated disturbance along with the stator current error in the sliding surface, thereby increasing the ability of the observer to reject the effect of the external load on the tracking performance. Extensive simulation results prove that the modified observer has a wide speed bandwidth compared to the conventional observer along with superior tracking, disturbance rejection characteristics and torque holding capability.
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Abbreviations
- \({i_{\rm ds}^{\rm s}, i_{\rm qs}^{\rm s}, i_{\rm dr}^{\rm r}, i_{\rm qr}^{\rm r}}\) :
-
d- and q-axis stator and rotor currents in the stationary and rotating reference frame
- \({v_{\rm ds}^{\rm s}, v_{\rm qs}^{\rm s}}\) :
-
d- and q-axis stator voltages in stationary reference frame
- T r :
-
Rotor time constant
- \({R_{\rm s}, R_{\rm r}}\) :
-
Stator and rotor resistance
- \({\sigma}\) :
-
Leakage reactance
- \({L_{\rm r}, L_{\rm m}, L_{\rm s}}\) :
-
Rotor, magnetizing and stator self inductance
- \({L_{\rm ls}, L_{\rm lr}}\) :
-
Stator and rotor leakage inductances
- \({{\omega }_{\rm r},\hat{\omega}_{\rm r},{\omega}^{\rm{\ast}},{\omega }_{\rm{bsync}}}\) :
-
Actual rotor speed, estimated rotor speed, speed reference, base synchronous speed
- \({\psi_{ds}^{s}, \psi_{qs}^{s}, \psi_{dr}^{s}, \psi_{qr}^{s}}\) :
-
d-axis and q-axis stator and rotor flux linkages in stationary reference frame
- \({\hat{\varphi }_{\rm d},\hat{\varphi}_{\rm q}}\) :
-
d-axis and q-axis estimated rotor flux linkages
- \({{\theta }_{\rm f},{\theta }_{\rm{sl}}, {\theta }_{\rm r}}\) :
-
Field angle, slip angle and rotor angle
- \({{T}_{\rm e}^{\ast}}\) :
-
Reference electromagnetic torque
- \({{i}_{\rm{ds}}^{\rm{\ast}},{ i}_{\rm{qs}}^{\ast}}\) :
-
d-axis and q-axis stator currents in synchronously rotating reference frame
- \({{i}_{\rm{as}}^{\ast} ,{ i}_{\rm{bs}}^{\ast} ,{ i}_{\rm{cs}}^{\ast}}\) :
-
3 phase reference currents
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Mohan Krishna, S., Febin Daya, J.L. A Modified Disturbance Rejection Mechanism in Sliding Mode State Observer for Sensorless Induction Motor Drive. Arab J Sci Eng 41, 3571–3586 (2016). https://doi.org/10.1007/s13369-016-2201-8
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DOI: https://doi.org/10.1007/s13369-016-2201-8