Blackbox Parameter Varying Transfer Functions Model for Highly Nonlinear Electronic Power Converters in DC Microgrids

The power electronic based dc distribution systems are becoming an interesting solution in many applications as electric vehicles (automobiles, planes, ships, etc.), data centers, and microgrids. On the one hand, due to the complexity and the amount of these installations, the use of sophisticated commercialoff-the-shelf converters is very convenient. On the other hand, the use of commercial converters complicates the system-level analysis of these systems, due to the lack of detailed information about the dynamic response of these devices. A solution to this issue is the blackbox modeling approach, which is able to identify behavioral models of the converters from their response to specific tests. However, the approaches available in the literature are not able to account for strong nonlinear dynamic behaviors, such as the ones shown by converters with discontinuous and continuous conductions modes or the ones that integrate different control modes. In this paper, a blackbox Parameter Varying Transfer Functions (PVTF) model is proposed in order to obtain very accurate models of commercial converters in dc microgrid applications.