Experimental evaluation of FOC of 3-phase IM under open-phase fault

New approach to control the induction motors based on immersion and invariance technique

“…By considering (2) and 3, it can be seen that the rotor flux estimation error (ϕ r − φ r ) is exponentially converged to zero. To simplify calculations, the system is rewritten in state-space form in which, x 1 and x 2 indicate rotor speed ω and magnetic flux ϕ r , u 1 and u 2 are control inputs, x 3 and x 4 indicate stator current vectors (i sd , i sq ).…”

“…Among the control methods for IMs, the vector control methods (VCMs) can accurately speed up control from zero to higher than rated speed. Field orientation control (FOC) that is a class of vector methods has a good control performance, while its shortcomings include complicated structure, dependence on motor parameters and presence of several controllers in its structure [1][2][3].…”

Experimental evaluation of a three‐phase induction motor drive during pre‐fault and post‐fault operation

“…Identification of the switch fault in the inverter leg is proposed based on a comparison of threshold values in references 1‐9. Fault segregation methods and control algorithms for post‐fault operation of the drive are proposed in references 5‐24. During inverter re‐configuration, the motor neutral terminal is joined to the dc‐link capacitor mid‐point and the faulty phase terminal of the motor associated with the inverter leg is isolated, 5,10‐14 or motor neutral terminal is joined to an auxiliary inverter leg (fourth leg), as in references 6,13,14.…”

“…Fault segregation methods and control algorithms for post‐fault operation of the drive are proposed in references 5‐24. During inverter re‐configuration, the motor neutral terminal is joined to the dc‐link capacitor mid‐point and the faulty phase terminal of the motor associated with the inverter leg is isolated, 5,10‐14 or motor neutral terminal is joined to an auxiliary inverter leg (fourth leg), as in references 6,13,14. In all these re‐configurations, the motor operates in two‐phase mode, and the line current amplitude of the healthy phases is increased by times and displaced by 60° electrical.…”

“…For control of fault‐tolerant induction motor drives, a 3D space vector PWM control is used in reference 11, field‐oriented control (FOC) is used in references 12,13, modified current control technique is used in reference 6, and sensorless speed control technique is reported in reference 8. The drawbacks in these techniques are slow dynamic response, more control complexity and require more number of control parameters.…”