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

Ahmed Aldhaheri and Amir Etemadi
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Ahmed Aldhaheri: Department of Electrical and Computer Engineering, The George Washington University, Washington, DC 20052, USA
Amir Etemadi: Department of Electrical and Computer Engineering, The George Washington University, Washington, DC 20052, USA

Energies, 2017, vol. 10, issue 4, 1-14

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.

Keywords: active damping; DC distributed systems; dynamic performance; impedance decoupling; impedance overlap; minor loop gain; non-causal system; stability margins (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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