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A Novel Average Value Model for the Faulty Threephase Diode Rectifier Bridge
Mehdi Rahnama*, Abolfazl VahediĘ”, Arta Mohammad Alikhani*, Babak Nahid-Mobarakeh**, and Noureddine Takorabet**
Abstract Rectifiers are widely used in industrial applications. Although detailed models of rectifiers are usually used to evaluate their performance, they are complex and time-consuming. Therefore, the Average Value Model (AVM) has been introduced to meet the demand for a simple and accurate model. This type of modeling of rectifier can be used to simplify the simulation of large systems. The AVM of diode rectifier has been the area of interest for many electrical engineers. However, the healthy diode rectifiers are only considered for average value modeling. By contrast, faults occur frequently on diodes, which eventually cause the diode to be open-circuit and consequently, it is essential to model the bridge rectifier under this faulty condition. Indeed, the conventional AVMs are not appropriate and accurate for a faulty rectifier and they are significantly different in modeling. In this paper, a novel application of the parametric average value of the three-phase line-commutated rectifier is proposed in which one diode of the rectifier is considered open-circuited. In order to evaluate the proposed AVM, it is compared with the experimental and simulation results for the application of the brushless synchronous generator field. The results clearly demonstrate the accuracy of the proposed model.
Keyword Average value modeling, Open circuit fault, Three-phase uncontrolled rectifier
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