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Energies 2017, 10(7), 904; doi:10.3390/en10070904

Output Impedance Control Method of Inverter-Based Distributed Generators for Autonomous Microgrid

Department of Electrical Engineering, Chosun University, 309, Pilmun-daero, Dong-gu, Gwangju 61452, Korea
This paper is an extended version of our paper published in Proceedings of the 2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC), Hefei, China, 22–25 May 2016.
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Received: 25 May 2017 / Revised: 26 June 2017 / Accepted: 28 June 2017 / Published: 2 July 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

The droop method is the most favorable alternative in microgrid implementations for autonomous control of grid-forming inverter-based distributed generators (DGs) connected in parallel. However, the dynamic characteristic of the conventional droop method is poor because the inertias of inverter-based DG units are extremely low and the transmission line is normally very short. An output impedance control method to enhance the dynamic performance and minimize the circulating current between grid-forming DGs is devised in this study. It is shown that it also enhances the power and harmonic sharing accuracy. The proposed method utilizes the virtual output impedance as a control signal for reactive power flow management. The effectiveness of the proposed scheme is validated using the high-speed field programmable gate array (FPGA)-based real-time hardware-in-the-loop test results. View Full-Text
Keywords: inverters; microgrid; droop control; distributed generators (DGs); uninterruptable power supply (UPS) inverters; microgrid; droop control; distributed generators (DGs); uninterruptable power supply (UPS)
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Choi, Y.-O.; Kim, J. Output Impedance Control Method of Inverter-Based Distributed Generators for Autonomous Microgrid. Energies 2017, 10, 904.

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