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Electronics 2019, 8(1), 39; https://doi.org/10.3390/electronics8010039

A Quasi-Average Estimation Aided Hierarchical Control Scheme for Power Electronics-Based Islanded Microgrids

1
School of Electronics Information and Electrical Engineering (SEIEE), Shanghai Jiao Tong University, Smart Grid Research & Development Centre, No.800 Dongchuan Road, Shanghai 200240, China
2
State Grid Changzhou Power Supply Company, Changzhou, Jiangsu 213000, China
3
Department of Electrical Engineering, University of Engineering and Technology (U.E.T), G.T. Road, Lahore 54890, Pakistan
*
Authors to whom correspondence should be addressed.
Received: 9 November 2018 / Revised: 13 December 2018 / Accepted: 20 December 2018 / Published: 1 January 2019
(This article belongs to the Special Issue Beyond Smart Grid: Power Quality, Reliability and Security Challenges)
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Abstract

Self-governed micro power networks are a promising solution for meeting the energy needs of isolated communities not having access to regular transmission networks. The control of such isolated networks requires regulation and “fair” sharing of several power generation and storage resources as well as efficient peer-to-peer coordination between power converters operating in the network. The regulation of key parameters as voltage, frequency and power sharing is to be ensured for the system to operate optimally. This paper proposes a new, de-centralized, and hierarchical control approach for power inverters in isolated micro networks with multi-layered controls, each addressing the regulation of key system parameters. The proposed scheme uses distributed quasi-averaging estimators at each participating node to achieve resilience towards disturbances caused by delayed transmission of measurement and control signals in the data acquisition and information exchange layer. Detailed system models are developed using MATLAB and Sim-power systems to test the effectiveness of the proposed scheme under varying control and network scenarios. The results of these studies are presented as pole zero evolutions, stability margins and case study wise simulations. The studies carried out verify the validity of the proposed control strategy for micro-distribution networks. View Full-Text
Keywords: microgrid control; power electronics systems; DC-AC power converters; hierarchical control systems; distributed control systems; quasi-averaging; power system operation microgrid control; power electronics systems; DC-AC power converters; hierarchical control systems; distributed control systems; quasi-averaging; power system operation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hashmi, K.; Mansoor Khan, M.; Xu, J.; Shahid, M.U.; Habib, S.; Faiz, M.T.; Tang, H. A Quasi-Average Estimation Aided Hierarchical Control Scheme for Power Electronics-Based Islanded Microgrids. Electronics 2019, 8, 39.

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