Hybrid bond graph diagnostic and localisation - signal signature study of three-cell converter

This paper discusses a localization technique for hybrid systems. It is possible to present the effectiveness of this model-based localization approach by using the example of three-cell converter and its eight operation modes. Based on obtained hybrid bond graph model (HBG), the signal signature for each configuration of the hybrid system was analyzed. The innovative interest of the present paper is the use only one representation (Bond Graph) for modeling and systematic generation of fault indicators based on structural and causal properties of used modeling tool. The transition between modes is achieved by control junctions, which can be activated (on) or deactivated (off). Furthermore, it is possible to substitute to a new model, called diagnostic hybrid bond graph model, where the known variables (i.e., parameters, measurements, sources) are the input of the system and the residuals are the output. Due to the reduced numbers of the measured devices we have no enough information for the system and it is important to define localization procedure for the system. In the second part of this paper signal signature study (SSS) applied for the three-cell converter is offered.