Hybrid UPS Based on Supercapacitor Energy Storage and Adjustable Speed Generator

Chlodnicki, Zdzislaw; Koczara, W.; Al-Khayat, N.

doi:10.1109/cpe.2007.4296512

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…During voltage sags or complete interruptions of the power supply, the energy has to be supplied by local Energy Storage Systems (ESS). Conventional ESS for UPS is basically relying on the choice of good lead-acid batteries [1]. However, there are many disadvantages associated with batteries such as low power density and limited charge/discharge cycles.…”

Section:  Elimmentioning

confidence: 99%

Battery/Supercapacitors Combination in Uninterruptible Power Supply (UPS)

Lahyani¹,

Venet

Guermazi

et al. 2013

IEEE Trans. Power Electron.

292

115

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This work presents a study of the reduction in battery stresses by using supercapacitors (SC's) in a 500 kVA rated UPS. We aim at investigating the optimal supercapacitors-battery combination versus the SC's cost. This investigation is threefold; first, supercapacitors and battery models developed using Matlab/Simulink® are presented and validated. Second, the architecture and the simulation of the designed system that combines the SC's and the battery are shown. The supercapacitors are used as high power storage devices to smooth the peak power applied to the battery during backup-time and to deliver full power during short grid outages. By charging the SC's through the battery at a suitable rate, all impulse power demands would be satisfied by the supercapacitors. Third, extensive simulations are carried out to determine the gain in battery RMS current, the gain in energy losses, the energy efficiency and the elimination rate of surge load power. These four performance parameters are determined by simulation and then analyzed. The influence of the SC's recharge on the performance indicators is highlighted. A thorough analysis involving optimal study proposes to draw the optimal SC's number and filter constant from the variation of the aforementioned parameters versus the cost of the SC's.

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Section:  Elimmentioning

confidence: 99%

Battery/Supercapacitors Combination in Uninterruptible Power Supply (UPS)

Lahyani¹,

Venet

Guermazi

et al. 2013

IEEE Trans. Power Electron.

292

115

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“…However, UPS are often based on conventional batteries because of their economic convenience and reliability. Among the UPS systems, the hybrid UPS (H-UPS) combines an electrical storage system (ESS) with UPS, using lead-acid batteries as the source of DC voltage [4]. Currently, replacing the batteries with an ultracapacitor is not affordable, because of the price of the latter [5].…”

Section: Introductionmentioning

confidence: 99%

Receding Horizon Control of Cooling Systems for Large-Size Uninterruptible Power Supply Based on a Metal-Air Battery System

Lee

Kang

et al. 2020

Energies

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As application of electric energy have expanded, the uninterruptible power supply (UPS) concept has attracted considerable attention, and new UPS technologies have been developed. Despite the extensive research on the batteries for UPS, conventional batteries are still being used in large-scale UPS systems. However, lead-acid batteries, which are currently widely adopted in UPS, require frequent maintenance and are relatively expensive as compared with some other kinds of batteries, like metal-air batteries. In previous work, we designed a novel metal-air battery, with low cost and easy maintenance for large-scale UPS applications. An extensive analysis was performed to apply our metal-air battery to the hybrid UPS model. In this study, we focus on including an optimal control system for high battery performance. We developed an algorithm based on receding horizon control (RHC) for each fan of the cooling system. The algorithm reflects the operation properties of the metal-air battery so that it can supply power for a long time. We solved RHC by applying dynamic programming (DP) for a corresponding time. Different variables, such as current density, oxygen concentration, and temperature, were considered for the application of DP. Additionally, a 1.5-dimensional DP, which is used for solving the RHC, was developed using the state variables with high sensitivity and considering the battery characteristics. Because there is no other control variable during operation, only one control variable, the fan flow, was used, and the state variables were divided by section rather than a point. Thus, we not only developed a sub-optimal control strategy for the UPS but also found that fan control can improve the performance of metal-air batteries. The sub-optimal control strategy showed stable and 6–10% of improvement in UPS operating time based on the simulation.

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“…Different lifetime cycles of the battery is dependent on preservation, usage, charging/ discharging process, and its active ambient temperature. The battery in an uninterrupted power supply (UPS) [3][4][5] has a lifetime period during 3-4 years or 500-600 cycles at 50% discharging [4] before a replacement is needed to assure its reliability. A literature review reports of the supercapacitor has been confirmed as several previous reports [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Combination of Supercapacitor and AC Power Source in Storing and Supplying Energy for Computer Backup Power

Phoosomma

Kasayapanand

Mungkung

2019

J. Electr. Eng. Technol.

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This paper presents the charge and discharge combination of the supercapacitors and the AC power source in storing and supplying energy for computer backup power. According to the behavior of storing and supplying energy, the SC can be charged with high currents. Whereas the battery cannot. The supercapacitors efficiency in storing and supplying power at high voltage and low current is 95.20%. An analysis also revealed that the charging time of the supercapacitors is less than 199 s. The combination of the supercapacitors and the battery required 604 s for charging time. The battery alone is the longest at 1080 s. Moreover, the study showed that the discharging time of the supercapacitors and the battery combination was more than 610 s. The discharging time of the battery and the supercapacitors were 285 and 579 s, respectively. Therefore, the combination of the supercapacitors and an AC power source can replace battery in the design of computer backup.

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Hybrid UPS Based on Supercapacitor Energy Storage and Adjustable Speed Generator

Cited by 15 publications

References 18 publications

Battery/Supercapacitors Combination in Uninterruptible Power Supply (UPS)

Battery/Supercapacitors Combination in Uninterruptible Power Supply (UPS)

Receding Horizon Control of Cooling Systems for Large-Size Uninterruptible Power Supply Based on a Metal-Air Battery System

Combination of Supercapacitor and AC Power Source in Storing and Supplying Energy for Computer Backup Power

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