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Energies 2016, 9(12), 1070; doi:10.3390/en9121070

A Decentralized Control Method for Distributed Generations in an Islanded DC Microgrid Considering Voltage Drop Compensation and Durable State of Charge

Korea Electrotechnology Research Institute, Changwon 51543, Korea
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Academic Editor: Josep M. Guerrero
Received: 10 October 2016 / Revised: 3 December 2016 / Accepted: 8 December 2016 / Published: 16 December 2016
(This article belongs to the Special Issue Microgrids 2016)
View Full-Text   |   Download PDF [2164 KB, uploaded 16 December 2016]   |  

Abstract

This paper presents a decentralized control method for distributed generations (DGs) in an islanded direct current (DC) microgrid. In most typical DC microgrids, a decentralized control method is based on a voltage droop control method. However, the grid voltage differs from node to node due to line voltage drop, and hence the power sharing ratio among DGs cannot be matched with as desired value. Especially in an islanded DC microgrid including an energy storage system as a voltage source, it is difficult for DGs to maintain the charge state of the ESS in a decentralized way. To overcome this problem, state of charge (SOC)-voltage droop control is applied to the ESS. By using the proposed droop method, the SOC information can be assigned to the grid voltage, and hence the other DGs are able to support the SOC in a decentralized way. For DGs to enhance the accuracy of the SOC estimation, voltage drop is compensated for based on forecasting data and line impedance data. The simulation is modeled and implemented using Power System Computer Aided Design/Electromagnetic Transients for DC (PSCAD/EMTDC, version 4.2, Winnipeg, Manitoba, Canada) and the simulation results show that the capability to maintain SOC as well as the system voltage profile are improved by using the proposed method. View Full-Text
Keywords: decentralized control; durable state of charge (SOC); islanded DC microgrid; voltage drop compensation decentralized control; durable state of charge (SOC); islanded DC microgrid; voltage drop compensation
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Hwang, C.-S.; Kim, E.-S.; Kim, Y.-S. A Decentralized Control Method for Distributed Generations in an Islanded DC Microgrid Considering Voltage Drop Compensation and Durable State of Charge. Energies 2016, 9, 1070.

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