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Secondary Control in Microgrids for Dynamic Power Sharing and Voltage/Frequency Adjustment

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Open access
Authors
Chandrasena, Ruwan Pathiranage Sarath
Shahnia, Farhad
Ghosh, Arindam
Rajakaruna, Sumedha
Date
2014
Type
Conference Paper

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Chandrasena, R. and Shahnia, F. and Ghosh, A. and Rajakaruna, S. 2014. Secondary Control in Microgrids for Dynamic Power Sharing and Voltage/Frequency Adjustment, in Dr. Ahmed Abu-Siada (ed), 24th Australasian Universities Power Engineering Conference (AUPEC 2014), Sep 28-Oct 1 2014, pp. 1-8. Perth, WA: Institute of Electrical and Electronics Engineers (IEEE).
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24th Australasian Universities Power Engineering Conference (AUPEC 2014)
Source Conference
24th Australasian Universities Power Engineering Conference (AUPEC 2014)
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Department of Electrical and Computer Engineering
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Abstract

This paper discusses the operation of the central controller for a microgrid. The central controller is responsible to maintain the voltage and frequency of the microgrid within the acceptable ranges while the distributed energy resources supply the required power demand of the loads based on the droop control. The desired ratio among the output active power of the distributed energy resources is determined by the distribution network tertiary controller. To achieve a dynamic variation for the output active power ratios among the distributed energy resources, the central controller has to adjust the references of the rated active power and the droop control coefficients. As this may lead to unacceptable voltage and frequency in the microgrid, the central controller has to adjust the references of the voltage and frequency consequently. The proposed central controller strategy for the microgrid is validated through PSCAD/EMTDC simulations.