Conclusion This paper has optimized the power quality for grid-connected PV systems by incorporating battery/supercapacitor storage and a novel ten-switch inverter.
In terms of energy storage capability, the commercially accessible supercapacitors can offer higher energy density (e.g., 5 Wh kg −1) than conventional electrolytic capacitors, though still lower than the batteries (up to ≈1000 Wh kg −1).
A supercapacitor has owned some internal resistance, resulting in energy loss. It can be modeled as a system consisting of a capacitor in series with a resistor (RES), as depicted in Figure 10. The RES is the resistance of the electrochemical capacitors and is important in reflecting the energy efficiency and power performance of supercapacitors.
The maximum power for the battery and the supercapacitor packs are limited by the ratings of their respective dc-dc converters. The energy exchanged by these storage devices are also limited by their maximum and minimum predefined state of charge. This general picture can be graphically observed in Fig. 2. Fig. 2.
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