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Energies 2017, 10(4), 470; doi:10.3390/en10040470

Impedance Decoupling in DC Distributed Systems to Maintain Stability and Dynamic Performance

Department of Electrical and Computer Engineering, The George Washington University, Washington, DC 20052, USA
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Author to whom correspondence should be addressed.
Academic Editor: Birgitte Bak-Jensen
Received: 10 February 2017 / Revised: 25 March 2017 / Accepted: 28 March 2017 / Published: 2 April 2017
(This article belongs to the Special Issue Distribution Power Systems and Power Quality)
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Abstract

DC distributed systems are highly reliable and efficient means of delivering DC power or adopting renewable energy resources. However, DC distributed systems are prone to instability and dynamic performance degradation due to the negative incremental input impedance of DC-DC converts. In this paper, we propose a generic method to eliminate the impact of the negative input impedance on DC systems by shaping the source output impedance such that its bode-plot is restricted in the area that is contained below the product of the source’s duty ratio and its characteristic impedance. The performance deterioration originates whenever the output impedance of the source exceeds, in magnitude, the input impedance of the load converter due to deficiency in stability margins. Hence, confining the impedance in the proposed region helps decouple the interaction between the converters and preserve their own dynamic performances. The proposed method was proven by analytical analysis, time-based simulation, and practical experiments. All of their outcomes were in agreement, proving the effectiveness of the proposed method in preserving the dynamic performance of distributed systems. View Full-Text
Keywords: active damping; DC distributed systems; dynamic performance; impedance decoupling; impedance overlap; minor loop gain; non-causal system; stability margins active damping; DC distributed systems; dynamic performance; impedance decoupling; impedance overlap; minor loop gain; non-causal system; stability margins
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Aldhaheri, A.; Etemadi, A. Impedance Decoupling in DC Distributed Systems to Maintain Stability and Dynamic Performance. Energies 2017, 10, 470.

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