The world is exposed to climate change and its greenhouse
gas emissions, such as carbon dioxide, have risen sharply in recent decades. In
order to reduce carbon dioxide emissions and global warming, the share of
renewable energy sources in the world's energy supply needs to be increased.
Many renewable energy sources are periodic sources, which means that it is
impossible to predict when they will generate electricity, Click
Here. For example, the capacity of a solar cell depends on the weather.
Production will not be much if it is completely cloudy, but if the day is
partly cloudy, the production speed can vary considerably. Figure 1 (a) shows
the capacity of a solar cell on a partly cloudy day. Energy storage systems are
needed to store energy during overproduction and to distribute energy during
energy shortages. Although hybrid lithium-ion and nickel-metal batteries can
store large amounts of energy (up to 180 W / kg), they shrink during rapid
production and load changes. Super capacitors can complement batteries in solar
cell hybrid energy storage systems, more
details for example, by providing the necessary power when needed to extend
battery life (Glavin et al., 2008), or they are derived from solar cells. The
output can be facilitated, for example by reducing voltage peaks and stabilizing
the voltage. Grid (Fig. 1 (B)). Simulations by Bjern Weit and Thomas Hempel in
our collective work also show that super capacitors work well in response to
solar power generation, as shown in Figure 1 (c).
Figure 1. Simulation
scheme using (A) a partly cloudy day, (B) the power output from a solar cell
using super capacitors with energy uniformity (red curve) and super capacitors
integrated with solar cell modules “Source”.
Super capacitor
Supercapacitors are energy storage devices that have
properties between a battery and a conventional capacitor. Batteries can store
a relatively large amount of energy, but charging and discharging speeds are
limited. On the other hand, conventional capacitors can store energy very quickly,
but the amount of energy is limited. More
details The idea of a super capacitor is that it can store more energy
than a conventional capacitor (ie, high energy density), and the charge /
discharge rate is faster than the battery speed (ie, higher energy density).
Other benefits include a long cycle life (it can be turned millions of times),
a wide operating temperature range (-40 - 65 ° C) and a simple charging process
with little risk of overcharging.
