Flexible Fault-Tolerant Topology for Switched Reluctance Motor Drives

Abstract

Switched reluctance motor (SRM) drives are one competitive technology for traction motor drives. This paper proposes a novel and flexible SRM fault-tolerant topology with fault diagnosis, fault tolerance, and advanced control functions. The converter is composed of a single-phase bridge and a relay network, based on the traditional asymmetrical half-bridge driving topology. When the SRM-driving system is subjected to fault conditions including open-circuit and short-circuit faults, the proposed converter starts its fault-diagnosis procedure to locate the fault. Based on the relay network, the faulty part can be bypassed by the single-phase bridge arm, while the single-phase bridge arm and the healthy part of the converter can form a fault-tolerant topology to sustain the driving operation. A fault-tolerant control strategy is developed to decrease the influence of the fault. Furthermore, the proposed fault-tolerant strategy can be applied to three-phase 12/8 SRM and four-phase 8/6 SRM. Simulation results in MATLAB/Simulink and experiments on a three-phase 12/8 SRM and a four-phase 8/6 SRM validate the effectiveness of the proposed strategy, which may have significant economic implications in traction drive systems. Index Terms-Fault diagnosis, fault tolerance, switched reluctance motor (SRM), traction motor drive. NOMENCLATURE D PWM duty cycle. i a , i b , i c Currents for phases A, B, and C. i max Phase current peak when faulty. i max Phase current peak when normal. Δi Hysteresis window. N r Rotor poles. K L Inductance slope when normal. K i Current slope when normal. K L Inductance slope when faulty.

Dynamic Fault-Tolerant Control on Faults with Prior Knowledge for Discrete Systems with Multiple Transfer Delays

“…Replacing () xk and () fk of 0 () yk in (1) with the estimated ˆ() xk and ˆ( ) fk in (19), respectively, then we obtain the reconstructed delay-free output 0 () yk of kth instant of (11). Replacing () xk of (5) …”

“…[18] proposed a fault-tolerant control method which was based on algebraic derivative estimation. [19] proposed a flexible fault-tolerant topology scheme for the faults of switched reluctance motor. An optimal fault-tolerant control for a kind of faults was proposed in [20].…”

Cost-Effective and High-Efficiency Variable-Speed Switched Reluctance Drives With Ring-Connected Winding Configuration

“…The H-bridge converter is only suitable for four or multiples of four-phase machines [21]; the bifilar converter employs an extra inductance for each phase, which increases the converter cost and volume [22]; the dissipative converter employs extra resistance to absorb the energy stored in the phase winding, giving rise to reduced efficiency and limited scope of application [23]. Except all the conventional converters mentioned above, some application specific converter topologies for SRM are proposed [24][25][26], which can also be treated as the potential converters.…”

New Integrated Multilevel Converter for Switched Reluctance Motor Drives in Plug-in Hybrid Electric Vehicles With Flexible Energy Conversion

“…Moreover, owing to further inherent advantages including high efficiency, high reliability, excellent fault-tolerance ability, and high starting torque in initial accelerations [20]- [23], SRMs are considered to be a competitive candidate for HEV and PHEV electric propulsions [24]- [28]. In order to improve the SRM system reliability, position sensorless control methods [29], [30] and fault tolerance schemes [31], [32] are developed for safetycritical applications. To reduce the SRM torque ripple, new direct torque control schemes have been proposed to deal with this issue [33], [34].…”