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Energies 2018, 11(1), 254; https://doi.org/10.3390/en11010254

Multi-Time Scale Model Order Reduction and Stability Consistency Certification of Inverter-Interfaced DG System in AC Microgrid

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
3
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
Author to whom correspondence should be addressed.
Received: 23 November 2017 / Revised: 17 January 2018 / Accepted: 18 January 2018 / Published: 20 January 2018
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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. View Full-Text
Keywords: inverter-interfaced distributed generator; nonlinear multi-time scale model; model order reduction; singular perturbation theory; stability consistency inverter-interfaced distributed generator; nonlinear multi-time scale model; model order reduction; singular perturbation theory; stability consistency
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Meng, X.; Wang, Q.; Zhou, N.; Xiao, S.; Chi, Y. Multi-Time Scale Model Order Reduction and Stability Consistency Certification of Inverter-Interfaced DG System in AC Microgrid. Energies 2018, 11, 254.

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