Improved Control Strategy for Microgrid Ultracapacitor Energy Storage Systems

Xiaobo Dou, Xiangjun Quan, Zaijun Wu, Minqiang Hu, Jianlong Sun, Kang Yang and Minhui Xu
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Xiaobo Dou: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Xiangjun Quan: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Zaijun Wu: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Minqiang Hu: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Jianlong Sun: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Kang Yang: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
Minhui Xu: Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China

Energies, 2014, vol. 7, issue 12, 1-21

Abstract: 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.

Keywords: microgrid; ultracapacitors; converter modeling; DC link voltage control; resonant regulator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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