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Title: Multi-time scale model order reduction and stability consistency certification of inverter-interfaced DG system in AC microgrid
Authors: Meng, Xiaoxiao
Wang, Qianggang
Zhou, Niancheng
Xiao, Shuyan
Chi, Yuan
Keywords: Inverter-interfaced Distributed Generator
Nonlinear Multi-time Scale Model
Issue Date: 2018
Source: Meng, X., Wang, Q., Zhou, N., Xiao, S., & Chi, Y. (2018). Multi-time scale model order reduction and stability consistency certification of inverter-interfaced DG system in AC microgrid. Energies, 11(1), 254-.
Series/Report no.: Energies
Abstract: AC microgrid mainly comprise inverter-interfaced distributed generators (IIDGs), which are nonlinear complex systems with multiple time scales, including frequency control, time delay measurements, and electromagnetic transients. The droop control-based IIDG in an AC microgrid is selected as the research object in this study, which comprises power droop controller, voltage- and current-loop controllers, and filter and line. The multi-time scale characteristics of the detailed IIDG model are divided based on singular perturbation theory. In addition, the IIDG model order is reduced by neglecting the system fast dynamics. The static and transient stability consistency of the IIDG model order reduction are demonstrated by extracting features of the IIDG small signal model and using the quadratic approximation method of the stability region boundary, respectively. The dynamic response consistencies of the IIDG model order reduction are evaluated using the frequency, damping and amplitude features extracted by the Prony transformation. Results are applicable to provide a simplified model for the dynamic characteristic analysis of IIDG systems in AC microgrid. The accuracy of the proposed method is verified by using the eigenvalue comparison, the transient stability index comparison and the dynamic time-domain simulation.
ISSN: 1996-1073
DOI: 10.3390/en11010254
Rights: © 2018 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
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