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Energies 2014, 7(12), 8095-8115;

Improved Control Strategy for Microgrid Ultracapacitor Energy Storage Systems

Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 3 October 2014 / Revised: 4 November 2014 / Accepted: 18 November 2014 / Published: 2 December 2014
(This article belongs to the Special Issue Electrochemical Energy Storage—Battery and Capacitor)
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Ultracapacitors (UCs), with their features of high power density and high current charge-discharge, have become the best choice for dynamic power compensation to improve the stability of microgrids and are increasingly being applied in microgrids. This paper presents the control of an energy storage system (ESS) based on ultracapacitors in the context of grid-connected microgrids. The ESS is composed of DC/AC and DC/DC converters tied by a dc link. An improved dynamic model for the ESS is proposed. Based on the proposed model a Proportional-Integral-Resonant (PIR) DC link voltage controller is proposed to maintain the DC link voltage through the charging-discharging control of ultracapacitors, capable of working properly under all operating conditions. An extra double frequency component is injected into the UC current by a R controller to dynamically compensate for DC instantaneous power and double frequency AC instantaneous power due to unbalanced grid conditions and disturbances. This feature maintains the DC link voltage constant under unbalanced conditions and increases the degrees of freedom of the DC/AC converter and thus facilitates the application of UCs in microgrids. Simulation and experimental results verify the effectiveness of the proposed control strategy. View Full-Text
Keywords: microgrid; ultracapacitors; converter modeling; DC link voltage control; resonant regulator microgrid; ultracapacitors; converter modeling; DC link voltage control; resonant regulator

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Dou, X.; Quan, X.; Wu, Z.; Hu, M.; Sun, J.; Yang, K.; Xu, M. Improved Control Strategy for Microgrid Ultracapacitor Energy Storage Systems. Energies 2014, 7, 8095-8115.

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