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Open Access

Modeling, Oscillation Analysis and Distributed Stabilization Control of Autonomous PV-based Microgrids

Zhuoli Zhao1, Jindian Xie1, Shaoqing Gong1, Xi Luo1, Yuewu Wang2, Chun Sing Lai1,3( ), Ping Yang4, Loi Lei Lai1, Josep M. Guerrero5
Department of Electrical Engineering, School of Automation, Guangdong University of Technology, Guangzhou 510006, China
School of Automation, Guangxi University of Science and Technology, Liuzhou 545006, China
Department of Electronic and Electrical Engineering, Brunel University London, London UB8 3PH, UK
Key Laboratory of Clean Energy Technology of Guangdong Province, South China University of Technology, Guangzhou 510640, China
Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
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Abstract

Driven by rising energy demand and the goal of carbon neutrality, renewable energy generations (REGs), especially photovoltaic (PV) generations, are widely used in the urban power energy systems. While the intelligent control of microgrids (MG) brings economic and efficient operation, its potential stability problem cannot be ignored. To date, most of the research on modeling, analyzing and enhancing the stability of MG usually assume the DC-link as an ideal voltage source. However, this practice of ignoring the dynamics of DC-link may omit the latent oscillation phenomena of autonomous PV-based MG. First, this paper establishes a complete dynamic model of autonomous PV-based MG including PV panels and DC-link. Different from previous conclusions of idealizing DC-link dynamics, participation factor analysis finds the potential impact of DC-link dynamics on system dynamic performance, and different influence factors including critical control parameters and non-linear V- I output characteristic of PV array are considered to further reveal oscillation mechanisms. Second, based on the average consensus algorithm, a distributed stabilization controller with strong robustness is proposed to enhance stability of the PV-based MG, which does not affect the steady-state performance of the system. Finally, the correctness of all theoretical analysis and the effectiveness of the proposed controller are verified by time domain simulation and hardware-in-loop tests.

Keywords

microgridoscillationstability analysisAverage consensus algorithmdistributed stabilizationphotovoltaic (PV) generation

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CSEE Journal of Power and Energy Systems
Volume 9 Issue 3,
May 2023
Pages 921-936
DOI: 10.17775/CSEEJPES.2021.07570
Cite this article:
Zhao Z, Xie J, Gong S, et al. Modeling, Oscillation Analysis and Distributed Stabilization Control of Autonomous PV-based Microgrids. CSEE Journal of Power and Energy Systems, 2023, 9(3): 921-936. https://doi.org/10.17775/CSEEJPES.2021.07570

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Received: 09 October 2021
Revised: 18 January 2022
Accepted: 23 April 2022
Published: 18 August 2022
© 2021 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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