DC power system stability

2013 IEEE Energy Conversion Congress and Exposition

2013

This paper introduces the extra feedback method as a technique to improve the performance of a cascaded converter system and stabilize its operation. In this paper, first, the block diagram representation of the small-signal model of a single converter is presented. The open-loop and closed-loop transfer functions of this converter are provided in this stage as well. Next, the presented model is expanded to the block diagram model of a cascaded converter system comprised of two dc-dc converters. Then, the extra feedback method which is the main contribution of the paper is introduced. Some design guidelines for applying this method to an experimental cascaded converter system are provided in this part as well. Finally, some experimental results are provided to verify the theoretical outcomes.

“…The future dc distribution systems are anticipated to be a mostly converter-dominated grid [9,10]. This contributes adversely to the stability of the grid.…”

Section: Introductionmentioning

confidence: 99%

Improving performance of a DC-DC cascaded converter system using an extra feedback loop

2013 IEEE Energy Conversion Congress and Exposition

2013

“…Emergence of complex dc power supply distribution networks as a side effect of growing power demand in industrial and automotive applications is accountable for recent attention among scholars to stability analysis and controller design methods for dc power systems [1][2][3][4][5][6][7]. Conventional control design techniques only focus on the sole stability of each module in the power system without the regard for dynamic interactions among modules after system integration.…”

Section: Introductionmentioning

confidence: 99%

Controller design method for a cascaded converter system comprised of two DC-DC converters considering the effects of mutual interactions

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

2012

This work analyzes the stability conditions of a cascaded converter system comprised of two dc-dc converters and proposes a new controller design procedure for the two converters considering their dynamic interactions. First, it introduces a single converter small-signal model and its mathematical representation and derives the required transfer functions from it. Next, it uses the single converter model to reach the cascaded converter system model and derives the principal equations for analyzing stability and controller design. Finally, it proposes a new design method based on the analysis of the derived equations. The simulation and experimental results are also provided, which verify the design procedure.

“…As a result, after system integration, interactions among modules may create instability in the power system. Consequently, the study of techniques to investigate and ensure stability in dc power supply distribution systems has received much attention recently [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analyzing stability issues in a cascaded converter system comprised of two voltage-mode controlled dc-dc converters

Paschedag

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

2011

This work analyzes the stability of a cascaded converter system comprised of two dc-dc converters operating with voltage-mode controllers. First it develops a single converter small-signal model and derives the mathematical representation of the converter from it. Next, it derives the required closed-loop transfer functions and input and output impedances from the model. Then, it develops the cascaded converter model based on the derived closed-loop impedances and the single converter model. Finally, it derives the cascaded converter system transfer function which addresses the stability of the system and analyzes the stability based on this transfer function.