On the Technology of Present-Day Manufactured Supercapacitors

Obreja, V.V.N.; Iordache, I.; Petroi, D.; Ionescu, Ciprian; Golumbeanu, V.; Svasta, Paul

doi:10.1109/estc.2006.280016

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…The supercapacitor, also called EDLC -electric double layer capacitor [8,9] , is a storage element with high capacity and power density. The EDLC specifications were defined considering the FC startup time, since during this interval, at the worst case, the supercapacitor must integrally supply the load demand.…”

Section: DC Busmentioning

confidence: 99%

Grid-connected renewable hybrid system for uninterruptible DC load maintenance

Coelho

Schmitz

Martins

2011

XI Brazilian Power Electronics Conference

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Uninterruptible Power Supplies (UPS) are strongly requested when critical loads are considered. The main problem associated with the conventional UPS consists in the employment of battery banks, since they are not renewable and, when long autonomy is required, heavy and bulky. This work proposes a 1 kW UPS based on Renewable Energy Sources (RES) -Photovoltaic (PV) array, Wind Turbine (WT) and Fuel Cell (FC) -able to operate on grid-connected or stand alone mode. The power flow among the sources, load and utility is dynamically defined taking into account the dc bus voltage level and the operational mode. PV and WT work providing the maximum available power, on the grid connected mode, or only the dc load demand power, on the stand alone mode. The utility operates consuming active power if the dc bus voltage is higher than the reference, or generating active power, otherwise. FC is activated only in the stand alone mode, if the dc bus voltage decreases to a critical value. Simulation results are presented in order to validate the concepts.

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Section: DC Busmentioning

confidence: 99%

Grid-connected renewable hybrid system for uninterruptible DC load maintenance

Coelho

Schmitz

Martins

2011

XI Brazilian Power Electronics Conference

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“…The supercapacitor, also called EDLC � electric double layer capacitor [20,21], is a storage element with high power density. The EDLC specifications were defined considering the FC startup time, since during this interval, at the worst case, the supercapacitor must integrally supply the load demand.…”

Section: Short-term Storage Element Supercapacitormentioning

confidence: 99%

Grid-connected PV-wind-fuel cell hybrid system employing a supercapacitor bank as storage device to supply a critical DC load

Coelho

Schimtz

Martins

2011

2011 IEEE 33rd International Telecommunications Energy Conference (INTELEC)

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in this work a grid-connected renewable energy system composed by a 1kW photovoltaic (PV) array and a 1 kW wind turbine (WT) is presented. The generated power from each renewable source is processed by independent dc-dc converters and provided to a common dc bus. Once baUeries employment is not desired, a 1.2 kW fuel cell (FC) and a supercapacitor bank (SCB) are used as backup, in order to keep a dc critical load continuously supplied. The SCB operates as a short term storage device and its use also ensure the 120 Hz voltage ripple attenuation. From proper process, the dc bus power is delivered to the main grid with high power factor. This paper presents all theoretical analysis referring the proposed system, including the MPPT strategies for PV and WT generators and the control strategies for the system operation on grid-connected and stand alone modes. A complete power flow study is also presented, considering several combinations of power generation and load demand. Simulation results, obtained by the use of PSIM software, are accomplished in order to validate the system operation.

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