Optimization of double-layer capacitor arrays

Spyker, R.L.; Nelms, R.M.

doi:10.1109/28.821815

Cited by 43 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, the capacitor actually has a very complex charge/discharge characteristic having multiple time constants [2], [3], [10], or more specifically, having distributed capacitance and resistance. Yet, for the purposes of this analysis, we will characterize it as a single lumped capacitance and a single lumped resistance, as it appeared in [8]. It is expected that the analytical results based on the simplified model will deviate from the actual performance at high frequencies kHz at which the stray inductance ( nH, [2], [10]) and the distributed capacitance nature of both ultracapacitor and battery dominate.…”

Section: A Circuit Descriptionmentioning

confidence: 99%

Power and life extension of battery-ultracapacitor hybrids

Dougal

Liu

White

2002

IEEE Trans. Comp. Packag. Technol.

465

194

View full text Add to dashboard Cite

The performance of a battery-ultracapacitor hybrid power source under pulsed load conditions is analytically described using simplified models. We show that peak power can be greatly enhanced, internal losses can be considerably reduced, and that discharge life of the battery is extended. Greatest benefits are seen when the load pulse rate is higher than the system eigen-frequency and when the pulse duty is small. Actual benefits are substantial; adding a 23 F ultracapacitor bank (3 7 PC10 ultracapacitors) in parallel with a typical Li-ion battery of 7.2 V and 1.35 A hr capacity can boost the peak power capacity by 5 times and reduce the power loss by 74%, while minimally impacting system volume and weight, for pulsed loads of 5 A, 1 Hz repetition rate, and 10% duty.

show abstract

Section: A Circuit Descriptionmentioning

confidence: 99%

Power and life extension of battery-ultracapacitor hybrids

Dougal

Liu

White

2002

IEEE Trans. Comp. Packag. Technol.

465

194

View full text Add to dashboard Cite

show abstract

“…The simplifi ed equivalent lumped model 13 of the EDLC cell can be expressed as shown in Figure 4(a). In some literatures, 17,19,20 the distributed model shown in Figure 4 Tables 2 and 3, respectively.…”

Section: Modeling Of Edlcmentioning

confidence: 99%

“…A nice study has already been reported, where the merits and limitations of different types of energy storage devices suitable for wind power application are discussed in detail. 11 The objective of this paper was to introduce energy capacitor system (ECS), which combines power electronic devices and electric double-layer capacitor (EDLC) [12][13][14][15][16][17][18][19] for wind power application with its detailed modeling and control strategy. This system has a feature of 'clean energy' from an environmental point of view.…”

Section: Introductionmentioning

confidence: 99%

Application of energy capacitor system to wind power generation

et al. 2007

View full text Add to dashboard Cite

In this paper, it is reported that energy capacitor system (ECS), which combines power electronic devices and electric double-layer capacitor, can significantly decrease voltage and power fluctuations of grid-connected fixed-speed wind generator. The proper selection of wind farm output power reference is still a problem for smoothing the wind farm output power. This paper proposes exponential moving average to generate the reference output power of a grid-connected wind farm. The objective of the control system is to follow the line power reference by absorbing or providing real power to or from the ECS. Moreover, the necessary reactive power can also be supplied to keep the wind farm terminal voltage at the desired reference level. Real wind speed data were used in the simulation analyses, which validate the effectiveness of the proposed control strategy. Simulation results clearly show that our proposed ECS can be suitable for wind power application.

show abstract

“…In recent years, an energy capacitor system (ECS) composed of an electric double-layer capacitor (EDLC) and power-electronics devices has been developed as an energy storage system [1][2][3][4][5], and has been applied in power systems [6][7][8][9][10]. EDLCs are safer and have a longer service life than secondary batteries and require virtually no maintenance, but they have the following disadvantages: the dielectric voltage-withstand level of an EDLC cell is 3 V or lower and the high internal-resistive loss is directly proportional to the square of the current.…”

Section: Introductionmentioning

confidence: 99%

Output leveling of wind power generation system by EDLC energy storage system

Kinjo

Senjyu

Uezato

et al. 2006

Electrical Engineering Japan

View full text Add to dashboard Cite

SUMMARYUtilization of renewable energy is becoming increasingly important from the viewpoints of environmental protection and conservation of fossil fuel. However, the generating power of renewable energy is always fluctuating due to the environmental status. Energy storage systems are indispensable in compensating these fluctuating components. An energy capacitor system (ECS) composed of an electric double-layer capacitor (EDLC) with power-electronics devices is useful for compensation of fluctuating power, since it is capable of controlling both active and reactive power simultaneously. This paper proposes a current-source ECS (CS-ECS), which consists of an EDLC, a bidirectional buck-boost DC-DC converter, and a bidirectional inverter. We present the control systems for active/reactive power control of CS-ECS, and show the effectiveness of CS-ECS through computer simulations for the case of a wind power generation system.

show abstract

Optimization of double-layer capacitor arrays

Cited by 43 publications

References 2 publications

Power and life extension of battery-ultracapacitor hybrids

Power and life extension of battery-ultracapacitor hybrids

Application of energy capacitor system to wind power generation

Output leveling of wind power generation system by EDLC energy storage system

Contact Info

Product

Resources

About