DC network stability and dynamic analysis using virtual impedance method

Chen, Dong and Xu, Lie and Yao, Liangzhong; (2012) DC network stability and dynamic analysis using virtual impedance method. In: IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. IEEE, CAN, 5625 - 5630. ISBN 978-1-4673-2419-9

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Abstract

A stability and dynamic assessment method is proposed for converter interfaced DC networks. With the current loop modeled as a 1st order delay, an actively controlled DC terminal converter and its control can be modeled as a virtual impedance in S-domain. Terminal transfer functions can therefore be obtained using Thevenin's equivalent. Based on the modeling method, a case study concerning voltage variation suppression in a multi-terminal DC network is performed using root locus and open-loop margin analysis. The accuracy of the developed DC network model and its effectiveness for assessing system stability and dynamic performance is validated using circuit simulation in time domain.