Small signal modeling of a compound Half-bridge DC/DC converter for renewable energy applications

This paper presents the control and modeling for a novel compound converter. This topology has the advantage of low cost, low switch count, high power density and high efficiency, so it is a valuable choice for combining hybrid renewable energy sources. The compound converter can interface multiple input sources, one bi-directional battery port and an isolated output port. Up to N-1 ports of the N port converter can be simultaneously regulated. However, the various control loops have interactions with each other due to the integrated power train issue. Therefore, implementing the closed loop control requires careful analysis of their dynamic behaviors. Moreover, proper decoupling method is required to obtain the control object with respect to each power port. In this paper, the dynamic behavior of the converter is characterized and studied. The small signal model is derived based on state space equations, and experimental results verify the converter control structure.