access icon free Generalised fault diagnostic method for power transistors in asymmetric half-bridge power converter of SRM drive

© The Institution of Engineering and Technology
Received 27/06/2018, Accepted 11/10/2018, Revised 10/09/2018, Published 16/10/2018

This study presents a generalised fault diagnosis method for power transistors in the asymmetric half-bridge power converter of switched reluctance motor (SRM) drive. In order to extract the remarkable fault features, three current sensors are rearranged. Each phase current can be calculated by solving the equations associated with the detected values of three current sensors and three coefficients obtained based on different switching states. Different faults are preliminarily detected by monitoring the error between the estimated bus current and the actual bus current. After the identification of fault occurrence, the error will be calculated with all the combinations of three coefficients. The minimum error will be found and the corresponding coefficients are recorded. The fault types and fault power transistors are located by comparing the actual coefficients with the recorded coefficients. Being different from the existing methods, the developed diagnostic strategy can detect multiple fault types and can be used in different control modes, including voltage pulse width modulation, current chopping control and angular position control schemes. Moreover, the proposed technique is easy for online implementation without extra sensors and additional electric devices. The effectiveness of the proposed solution is validated on a three-phase 12/8 SRM drive.

Inspec keywords: fault diagnosis; position control; bridge circuits; reluctance motor drives; machine control; electric current control; power convertors; reluctance motors

Other keywords: multiple fault types; switched reluctance motor drive; current chopping control; actual coefficients; different control modes; different switching states; recorded coefficients; fault occurrence; phase current; 12/8 SRM drive; corresponding coefficients; generalised fault diagnosis method; generalised fault diagnostic method; asymmetric half-bridge power converter; estimated bus current; fault power transistors; actual bus current; remarkable fault features; current sensors; different faults

Subjects: Synchronous machines; Control of electric power systems; Power convertors and power supplies to apparatus

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