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Title: An integral droop for transient power allocation and output impedance shaping of hybrid energy storage system in DC microgrid
Authors: Lin, Pengfeng
Wang, Peng
Xiao, Jianfang
Wang, Junjun
Jin, Chi
Tang, Yi
Keywords: Hybrid Energy Storage Systems
Integral Droop
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2017
Source: Lin, P., Wang, P., Xiao, J., Wang, J., Jin, C., & Tang, Y. (2018). An integral droop for transient power allocation and output impedance shaping of hybrid energy storage system in DC microgrid. IEEE Transactions on Power Electronics, 33(7), 6262-6277. doi:10.1109/TPEL.2017.2741262
Series/Report no.: IEEE Transactions on Power Electronics
Abstract: Power allocation in hybrid energy storage systems (HESSs) is an important issue for dc microgrids. In this paper, an integral droop (ID), inspired by the electrical characteristics of capacitor charging/discharging process, is proposed and applied to a cluster of energy storages (ESs) with high ramp rates. Through the coordination of the ID and conventional V-P droop, the transient power allocation in HESSs can be intrinsically realized in a decentralized manner. The high-frequency components of power demand can be compensated by the ESs with ID, whereas the ESs with V-P droop respond to the smooth change of load power. Additionally, the ID coefficient can be designed according to the nominal ramp rate of the ESs with slow response, which helps to extend the lifespan of the HESS. On the other hand, to easily assess the stability of the system feeding constant power loads, a minimum relative impedance criterion (MRIC) is developed. Based on MRIC, it is revealed that the proposed ID can shape the output impedance of the HESS and stabilize the entire system. The feasibility and effectiveness of ID are verified by both simulations and experimental results.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2017.2741262
Rights: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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