This paper deals with speed control of a squirrel cage six-phase induction machine (SC6PIM) in phase opening occurrences. A decoupled model of induction machine with unbalanced structure is given to analyze the phase opening operation of the SC6PIM. In order to reduce torque oscillations created in phase opening events, a fault-tolerant operation method by using indirect rotor field oriented control (IRFOC) technique is proposed and used to control the speed of the SC6PIM in each faulty operation. The proposed controller will be renewed in each fault situation of machine regarding the number and type of missed phases. Furthermore, in this paper, switching between controllers in some different cases is investigated and real time initial conditions setting for controllers is proposed to minimize the transient problems in switching instant. To evaluate the performance of proposed method, the experimental results are obtained on a small SC6PIM rated at 90 W.
This study presents field oriented control of a squirrel cage six-phase induction generator (SC6PIG) when a phase fault is detected in order to minimize output power oscillations during phase opening. An unbalanced structure of squirrel cage six-phase induction machine (SC6PIM) has been modeled to analyze healthy and faulty conditions of the machine. According to the unbalanced structure of the machine, a suitable controller is defined in phase missing condition to minimize power oscillations. After fault detection by using a dedicated system, the controller used in healthy condition is switched to a new one regarding to the fault situation. For each controller, appropriate initial conditions are chosen to minimize the transient behavior of switching process between healthy and faulty controllers. The whole proposed system has been implemented on an experimental set up including of a six-phase induction generator coupled with a permanent magnet direct current (dc) motor. Experimental results prove the feasibility and show the improvement of power quality when the controller is modified in phase missing conditions. The experimental results are presented for one phase missing and they can also be obtained for two or three phases missing conditions.
Keywords-six phase induction generator; phase missing; online controller modifying ; power oscillation reduction; IRFOC.
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