Abstract
The power electronic converter design is essential for the operation of the switched reluctance motor (SRM). Thus, a fault-tolerant power converter is fundamental to ensure high reliability and extend the drive operation. To achieve fault tolerance, fault detection and diagnosis methods are critical in order to identify, as soon as possible, the failure mode of the drive. To provide such capability, it is proposed in this paper a new fault-tolerant power converter scheme combined with a fault detection method regarding the most common power semiconductors failures in SRM drives. The fast and reliable proposed diagnosis method is based on the entropy theory. Based on this theory, normalized indexes (diagnostic variables) are created, which are independent from the load and speed of the motor. Through this method, it is possible to identify the faulty leg, as well as the type of power semiconductor fault. To test and evaluate the proposed solution several laboratory experiments were carried out using a 2 kW four-phase 8 / 6 SRM.
Highlights
There has been a renewed interest in the last decades concerning Switched Reluctance Motor (SRM) drives for a wide range of applications
The performance of the fault diagnosis method was tested considering several condition modes, namely: healthy operation, open and short-circuit failure modes. All these conditions were performed at different switched reluctance motor (SRM) speeds
A fault-tolerant fault-tolerant power power converter converter and and aa novel novel fast fast and and accurate accurate fault fault diagnosis diagnosis method method for for an an drive were proposed in this paper
Summary
There has been a renewed interest in the last decades concerning Switched Reluctance Motor (SRM) drives for a wide range of applications. It was possible to see that the SRM is a very interesting option for this kind of application [1,2,3,4] Another application that was verified that this machine is indicated to be used due to their simplicity and robust design, is related to their use as generator, namely, to extract energy from the wind and ocean waves [5,6,7,8,9,10]. In most safety-critical applications a continuous drive operation (in normal or degraded mode) must be assured in the presence of a drive failure until a possible stop to repair The interest in this motor is due to some important characteristics, such as high reliability level, high efficiency, simplicity of operation, and robust structure [13].
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