Concept Proposal and Test Run Results for a Hybrid Electric Energy Storage Method of High Power Capacitor/Large Energy Battery Combination

Nakayama, Tomohiro; Mineno, Katsuya; Tachihara, Wataru; Kawai, Yasuo; Hasegawa, Hiroaki; Hiraoka, Kazutaka; Kakizaki, Nobuo; Hanada, N.; Ishida, M.

doi:10.1541/ieejpes.134.76

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…We tested the efficiency of the proposed system in Tsukuba city in Ibaraki prefecture, Japan, by applying a function of BACHES [5][6] on several days in May 2014. The test results are shown in Fig.…”

Section: A Daily Test Resultsmentioning

confidence: 99%

“…We previously proposed and developed the BatteryCapacitor Hybrid Energy Storage system (BACHES), which improved the efficiency of the power converter by avoiding the converter operation in partial load [5] . In this paper, we tested the effect of BACHES on a power conditioning subsystem (PCS) and evaluated the impact of BACHES on annual gross power generation in Japan.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of converter efficiency in partial load using temporary storage with lithium-ion capacitor

Nakayama

Tachihara

Toda

et al. 2014

2014 49th International Universities Power Engineering Conference (UPEC)

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Electrical output efficiency from renewable energy sources tends to be lower because the converters, such as power conditioning subsystems (PCSs), are less efficient in partial load. Operation in partial load is common because of the fluctuations are typical in natural energy. We proposed and developed a high-efficiency converter system that uses a renewable energy source such as photovoltaics (PV), lithium-ion capacitors (LiCs) for temporary energy storage, a converter for external output, a pyranometer, and a controller. PV and LiCs are directly connected without a converter, and LiCs store electrical energy with ultra-high efficiency (approximately 99.4%) of PV output. The converter for external output can convert with high efficiency at the rating at one stroke from the stored energy in LiCs, while continuing to generate PV power. In general, a PCS for PV is operated at low efficiency at low solar radiation intensity of approximately 350 W/m 2 or below, and the operation stops when solar radiation intensity is less than approximately 200 W/m 2 . In the proposed system, LiCs temporarily store energy when solar radiation intensity is less than 350 W/m 2 or when the conversion efficiency of PCS drops below 80%. After solar radiation intensity increases or LiCs are recharged, PCS can output at over 92% efficiency by converting stored energy in LiCs at one stroke. As a result, the proposed system increased annual gross power generation in Japan by more than 12%.

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Section: A Daily Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of converter efficiency in partial load using temporary storage with lithium-ion capacitor

Nakayama

Tachihara

Toda

et al. 2014

2014 49th International Universities Power Engineering Conference (UPEC)

Self Cite

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show abstract

“…Thus, hybrid battery energy storage is employed to mitigate the variability of wind power or photovoltaic power, as well as in microgrids [4][5][6][7][8][9][10]. Batteries with high and low C-rates can be used to absorb short-and longperiod variations, respectively, in an effort to combine high performance and low cost.…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of Hybrid Battery Energy Storage Systems Applied to Frequency Control in Power System

Tamura

2015

Electrical Engineering Japan

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SUMMARYThe battery energy storage system (BESS) is prospective energy storage in the smart grid, and the hybrid energy storage system (HESS), using two different kinds of battery, is also being studied to achieve better performance and the lower cost than the single-battery-type BESS. However, the cost issue has not yet been evaluated explicitly. On the other hand, BESS has been studied and offers promise for ancillary service, although HESS has not been applied to frequency control in power systems. This paper focuses on the application of HESS to frequency control and its economic analysis. In this paper, the important battery characteristics in the application to a power system are introduced and two kinds of HESS are evaluated in terms of their cost when applied to frequency control. In addition, the cost HESS is used for peak shift as well as frequency control is analyzed. C⃝

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Evaluation of photovoltaics power systems with energy buffer to improve energy efficiency using a time series simulation model

Nakayama

Ito

Ishida

2015

2015 50th International Universities Power Engineering Conference (UPEC)

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Concept Proposal and Test Run Results for a Hybrid Electric Energy Storage Method of High Power Capacitor/Large Energy Battery Combination

Cited by 4 publications

References 6 publications

Improvement of converter efficiency in partial load using temporary storage with lithium-ion capacitor

Improvement of converter efficiency in partial load using temporary storage with lithium-ion capacitor

Economic Analysis of Hybrid Battery Energy Storage Systems Applied to Frequency Control in Power System

Evaluation of photovoltaics power systems with energy buffer to improve energy efficiency using a time series simulation model

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