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Energies 2016, 9(7), 480; doi:10.3390/en9070480

State of Charge-Based Active Power Sharing Method in a Standalone Microgrid with High Penetration Level of Renewable Energy Sources

Korea Electrotechnology Research Institute, Changwon 51543, Korea
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Academic Editor: Neville R. Watson
Received: 10 March 2016 / Revised: 17 June 2016 / Accepted: 17 June 2016 / Published: 23 June 2016
(This article belongs to the Special Issue Microgrids 2016)
View Full-Text   |   Download PDF [4214 KB, uploaded 23 June 2016]   |  

Abstract

Standalone microgrids, which are mainly constructed on island areas have low system inertia, may result large frequency deviations even for small load change. Moreover, increasing penetration level of renewable energy sources (RESs) into standalone microgrids makes the frequency stability problem even worse. To overcome this problem, this paper proposes an active power sharing method with zero frequency deviations. To this end, a battery energy storage system (BESS) is operated as constant frequency (CF) control mode, whereas the other distributed generations (DGs) are operated as an active and reactive power (PQ) control mode. As a result, a state of charge (SOC) of the BESS is changed as the system load varies. Based on the SOC deviation, DGs share the load change. The SOC data is assumed to be sent via communication system, hence the communication time delay is considered. To enhance reliability, controllers of DGs are designed to take account of the failure of communication system. The simulation results show that active power can be shared among DGs according to desired ratio without frequency deviations even for large variation of output power of RESs. View Full-Text
Keywords: constant frequency (CF); renewable energy source; state of charge (SOC)-based active power sharing; standalone microgrid; zero frequency deviation constant frequency (CF); renewable energy source; state of charge (SOC)-based active power sharing; standalone microgrid; zero frequency deviation
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Kim, Y.-S.; Hwang, C.-S.; Kim, E.-S.; Cho, C. State of Charge-Based Active Power Sharing Method in a Standalone Microgrid with High Penetration Level of Renewable Energy Sources. Energies 2016, 9, 480.

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