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Energies 2017, 10(1), 69; doi:10.3390/en10010069

Stability Analysis and Stability Enhancement Based on Virtual Harmonic Resistance for Meshed DC Distributed Power Systems with Constant Power Loads

College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Author to whom correspondence should be addressed.
Academic Editor: Birgitte Bak-Jensen
Received: 24 November 2016 / Revised: 16 December 2016 / Accepted: 2 January 2017 / Published: 9 January 2017
(This article belongs to the Special Issue Distribution Power Systems and Power Quality)
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Abstract

This paper addresses the stability issue of the meshed DC distributed power systems (DPS) with constant power loads (CPLs) and proposes a stability enhancement method based on virtual harmonic resistance. In previous researches, the network dynamics of the meshed DC DPS are often ignored, which affects the derivation of the equivalent system impendence. In addition, few of them have considered the meshed DC DPS including multiple sources with voltage-controlled converters and CPLs. To tackle the aforementioned challenge, this paper mainly makes the following efforts. The component connection method (CCM) is employed and expanded to derive the stability criterion of the meshed DC DPS with CPLs. This stability criterion can be simplified to relate only with the network node admittance matrix, the output impendences of the sources, and the input admittances of the CPLs. A virtual harmonic resistance through the second-order generalized integrator (SOGI) is added in the source with the voltage-controlled converter to lower the peak of the source output impendence, which can enhance the stability of the meshed DC DPS. The effectiveness of the proposed stability criterion and stability enhancement method are verified by nonlinear dynamic simulations. View Full-Text
Keywords: meshed DC distributed power systems; stability criterion; virtual harmonic resistance; stability enhancement meshed DC distributed power systems; stability criterion; virtual harmonic resistance; stability enhancement
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MDPI and ACS Style

Hu, H.; Wang, X.; Peng, Y.; Xia, Y.; Yu, M.; Wei, W. Stability Analysis and Stability Enhancement Based on Virtual Harmonic Resistance for Meshed DC Distributed Power Systems with Constant Power Loads. Energies 2017, 10, 69.

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