Abstract
Energy storage systems (ESSs) are becoming indispensable components in electric power systems. They are used for energy scheduling, power/voltage smoothing, load shifting, as well as for emergency power supply. The most common control method for power/voltage smoothing is based on a high-pass-filter (HPF) structure. It generates the power reference according to the fluctuating power and provides a stabilization effect. The power and energy supplied by ESS are majorly configured by the cut-off frequency and gain of the HPF. Considering the operational limits on ESS state-of-charge (SoC), this paper proposes an adaptive cut-off frequency design method to realize communication-less and autonomous operation of a system with multiple distributed ESS. The experimental results demonstrate that the SoCs of all ESS units are kept within safe margins, while the SoC level and power of the paralleled units converge to the final state, providing a natural plug-and-play function.
Original language | English |
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Journal | I E E E Transactions on Industrial Electronics |
Volume | 65 |
Issue number | 8 |
Pages (from-to) | 6612-6624 |
Number of pages | 13 |
ISSN | 0278-0046 |
DOIs | |
Publication status | Published - Aug 2018 |
Keywords
- Energy storage system
- Power smoothing
- Adaptive control
- State-of-charge
- Microgrid
- Distributed control