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access icon openaccess Fault tolerant single-phase capacitor start capacitor run induction motor powered with cascaded multilevel quasi impedance source inverter

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 21/06/2018, Accepted 27/07/2018, Published 22/01/2019

In this study, the performance of fault tolerant single-phase capacitor start capacitor run induction motor powered using seven-level quasi-impedance source inverter (qZSI) is analysed. The seven-level inverter consists of three units of qZSI connected in cascade. When one of the qZSI module fails (due to semiconductor failure), the resultant rms voltage applied to the motor will be reduced by one-third. This leads to reduction in both mechanical speed and electromagnetic torque of the motor. To restore the performance of the motor to pre-fault condition, the voltage deficit must be compensated. In conventional CHB inverter, it is not possible to achieve the pre-fault voltage. However, in qZSI, it is possible to achieve required voltage boost by application of shoot through duty cycle. Here, voltage of other two healthy operating modules can be boosted to reach pre-fault inverter output voltage during post-fault condition. The maximum voltage boost achievable is limited by the maximum shoot-through duty cycle which is related with modulation index. To verify the concept, simulation results of single-phase capacitor-start capacitor-run induction motor with or without proposed control algorithm are discussed. Experimental results for the proposed algorithm with RL load are discussed.

Inspec keywords: invertors; starting; induction motors; load (electric); fault tolerance; electric impedance; machine control; torque; velocity

Other keywords: CHB inverter; modulation index; qZSI module; maximum shoot-through duty cycle; rms voltage boost; fault tolerant single-phase capacitor start capacitor run induction motor; electromagnetic torque; cascaded multilevel quasi impedance source inverter; pre-fault condition; control algorithm; mechanical speed; RL load

Subjects: DC-AC power convertors (invertors); Control of electric power systems; Asynchronous machines

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