A New Method for Power Converter Fault Diagnosis in SRM Drives

Abstract

This paper presents a new fault diagnostic technique applied to switched reluctance motor drives, based on the analysis of the power converter supply current. A fault is detected when the measured amplitude of the dc bus current differs from its expected amplitude, assuming normal operating conditions. The information about phase currents amplitudes and the control commands of all power switches permit to easily estimate the amplitude of the power converter supply current, since an asymmetric bridge converter is used. Simulation and experimental results are presented. Open-and short-circuit fault occurrences in the converter power switches are considered and analyzed. The proposed technique can early detect these fault occurrences and can also identify the affected motor phase. In almost all situations, the faulty element is also identified. An early fault diagnosis, with an accurate fault identification, is of a paramount importance since it permits the early adoption of fault-tolerant procedures that minimize the fault impact on the machine operation.Index Terms-Fault analysis, fault diagnosis, switched reluctance motor (SRM), variable speed drives.

Improvement of the Response Speed for Switched Reluctance Generation System Based on Modified PT Control

“…This paper chooses the separate excitation mode shown in Figure 2, which can separate the power generated by the winding from the excitation power completely and ensure high stability [26]. The control methods have been proposed for regulating the output power of SRG, such as angle position control (APC), current chopping control (CCC), and pulse width modulation (PWM).…”

“…This paper chooses the separate excitation mode shown in Figure 2, which can separate the power generated by the winding from the excitation power completely and ensure high stability [26].…”

Design and Initial Testing of a High-Speed 45-kW Switched Reluctance Drive for Aerospace Application

“…In its classical form, the machine presents itself with a 'simple' construction having a single element rotor and concentrated windings. These attributes coupled with diagnostic techniques such as those presented in [9], renders such a topology a favourite for high speed, harsh environment applications. The studied variant of this machine is of such classical type.…”

Wavelet Packet Decomposition-Based Fault Diagnosis Scheme for SRM Drives With a Single Current Sensor

“…However, it is not suited for online angle modulation and variable load systems. In [26], one extra current sensor is needed in addition to the phase current sensors to measure the dc-link current for comparison with the estimated dc-link current calculated from the phase currents, which increase the cost and complexity of the drive. In [27], the difference between the averages of the phase currents is calculated to diagnose the faults for SRM drives with four current sensors used for four phases.…”

“…In [25], two schemes by monitoring the chopped bus current and by detecting the upper freewheeling bus current and excitation bus current are proposed and compared in detail for power switch faults. The work in [26] presents a fault diagnostic technique for open-and short-circuit faults in SRM power switches, based on the difference between the measured and estimated dc-link currents. However, one extra current sensor is also needed in addition to the phase current sensors, increasing the cost and volume of the drive.…”