Robust Filter Design Technique to Limit Resonance in Long Cables Connected to Power Converters

Abstract

A novel numerical analysis to characterize and to visualize the resonance behavior in a long cable is proposed. The resonance-due maximum amplification, and the frequency and position to which the maximum occurs, are represented in function of the load connected to the cable terminal in a 3-D plot here denominated "resonance surface response." This analysis is based on a white box modeling and allows the design of protective measures against the resonance phenomenon, such as filter design, protection against cross-talk, adequate voltage insulation choice, etc. One of these applications is exemplified: the design of an output filter for a power converter connected to a long cable, from which the results are compared to a classical design of the same filter to highlight the advantages and demonstrate the robustness of the proposed technique.Index Terms-Embedded system design, power cable, resonance in long cable, white-box model.

Analysis of the resonance phenomenon in unmatched power cables with the resonance surface response

“…Note that the critical load in Fig. 13a is not balanced, therefore could not be found with an analysis based on a common, dierential-mode decomposition as discussed in section 4.1 and detailed in [21]. Only the analysis of higher dimension surfaces proposed here is able to characterize the resonance behavior of a generic system.…”

“…An example of 3D resonance surface response for a three-conductor balanced system using the dierential/common-mode decomposition can be found in a previous work by the same authors [21]. The systems that do not present cyclic symmetry can only be analyzed by the general approach described in the next section.…”

“…Also, the theoretical aspects of the resonance surface response are detailed and dierent analysis deriving from this approach are exploited. For a direct example of their applicability please refer to [21] where the resonance surface response was rst introduced by the authors, but know that this previous paper is limited to the analysis of three-conductor balanced systems, with the surfaces represented on no more than three dimensions.…”