Abstract
In order to overcome the limitations of conventional diagnosis methods, this paper proposes a reliable and practical on-line fault localization scheme for a pulse width modulation (PWM) inverter-fed permanent magnet synchronous machine (PMSM) drive system even when the inverter has simultaneous open faults in up to three switches. An open-switch fault is usually initiated by an accidental over-current, or electrical and thermal stresses. This fault may induce crucial secondary damage in the drive system since it is easily propagated and produces a continuous harmful effect on other system components. The open-switch faults in inverters often occur in a very complicated manner. Due to this reason, it was only recently that real-time diagnosis schemes under the open-switch faults in multiple switches have been presented in a few references. However, to alleviate the complexity and exactness issues, most of the conventional diagnosis schemes have considered the open faults only in two simultaneous switches until now, which is not generally the case. Even though the fault detection is simple and immediate, the exact fault localization is not a simple task, especially when there are open faults in three simultaneous switches because different open-switch fault locations may develop the same fault signature. To deal with such a problem, free-wheeling mode detection is introduced in this paper for the purpose of identifying the exact fault group and the faulty switch location. Then main objective of this paper is to realize a reliable fault localization algorithm under the condition of simultaneous open-switches (up to three) on an online basis without requiring any extra hardware or sensors in order that the algorithm can be easily installed in main CPU of a commercial drive system. For this purpose, the open faults in simultaneous switches are categorized into seven different fault groups. The entire system is implemented on a digital controller by using TMS320F28335 digital signal processor (DSP). The experimental results are presented under various open fault conditions to validate the usefulness of the proposed open-switch fault localization scheme.
Highlights
In recent years, reliability, continuity, and fault-related issues have been receiving lots of research attention in automation or industrial processes employing a pulse width modulation (PWM)inverter-fed permanent magnet synchronous machine (PMSM) drive systems
PWM inverter-fed PMSM drive systems are usually subject to various faults in different system components such as the power converter module, controller, and sensing devices [2]
In order to overcome the limitations in the existing methods, this paper proposes a reliable and practical on-line fault localization scheme for a PWM inverter-fed PMSM drive system, even when the inverter has simultaneous open faults in up to three switches
Summary
Reliability, continuity, and fault-related issues have been receiving lots of research attention in automation or industrial processes employing a pulse width modulation (PWM). The success of a fault-tolerant system is mainly dependent upon the precision and speed of both the fault detection and identification of the fault location This scheme usually requires large back-up equipment to replace a damaged component in the stage of hardware reconfiguration, which is often the cause of increased cost, size, and complexity of the system. Alternative fault diagnosis methods use a voltage-based approach for open-switch fault detection. Instead of using the current or voltage-based approaches, other fault diagnosis methods use an observer-based technique [32], the wavelet transformation-based switching faults detection [33], model-based approach [34], and a model reference adaptive system (MRAS) [35] These techniques are preferred in industrial applications because they do not require the installation of extra hardware. The experimental results for various scenarios of open faults in multiple switches to verify the usefulness of the proposed open-switch fault localization scheme
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