With the advancement of supercapacitor energy storage technology,
supercapacitor energy storage has become possible. Therefore, it has attracted
people's attention to this industry. So, how much do friends know about
supercapacitor energy storage? Next, we will share relevant content with you.
Introduction As early as August 2006, Shanghai No. 11 supercapacitor bus was put
into operation. It was the only pure electric bus in the world that had passed
the test of large-scale and long-term commercial operation. What characteristics
does supercapacitor have that make it popular among users? Technical Principles
We take electric double layer capacitors as an example to introduce the working
principle of supercapacitors. Electric double layer supercapacitor is a new type
of energy storage device that relies on polarized electrolyte to store
electrical energy. Its principle structure is shown in the figure. In a double
layer capacitor, electrical energy is stored in an electrostatic field between
the electrodes and the ions of the electrolyte. When the electrode is charged,
the surface charge of the electrode in the idealized electrode state will
attract the opposite ions in the surrounding electrolyte solution, causing these
ions to attach to the electrode surface to form a double charge layer, forming
an electric double layer capacitance. Compared with traditional capacitors,
supercapacitors have a much larger area for storing charges and a much smaller
distance at which charges are isolated. Therefore, the capacitance of a
supercapacitor unit can be as high as several to tens of thousands of farads.
Due to the special process, the equivalent resistance of the supercapacitor is
very low, the capacitance is large and the internal resistance is small. The
supercapacitor can have a very high peak current, so it has a very high specific
power, up to 50 to 100 times that of the battery, which can reach about 10kW/kg.
This feature makes the supercapacitor very suitable for short-term high-power
applications. Application scenarios Public transportation/electric vehicles The
composite power system composed of supercapacitors and other energy storage
components takes into account the advantages of the high specific energy of
other energy storage components and the high specific power of supercapacitors,
and can better meet the needs of starting and accelerating electric vehicles.
performance requirements and can improve the braking energy recovery efficiency
of electric vehicles. Increase driving range. At present, supercapacitors can be
combined with batteries, fuel cells, flywheel batteries, etc. to form composite
power systems. The use of supercapacitor-battery composite power supply systems
in pure electric vehicles and hybrid electric vehicles will be one of the
important directions for future development in the field of electric vehicles.
Wind power Wind power is currently the fastest growing renewable energy power
generation technology. However, wind energy is a randomly changing energy
source, and changes in wind speed will cause fluctuations in the output power of
wind turbines, which will affect the power quality of the power grid. Therefore,
studying the output power regulation of grid-connected wind farms has become an
important issue in wind power generation technology. Additional energy storage
equipment can not only regulate reactive power, stabilize wind farm bus voltage,
but also regulate active power within a wide range, which is a current research
hotspot. With the development of manufacturing technology, the energy density of
supercapacitors has been greatly improved, and it has entered the commercial
application stage in some short-term power energy storage applications. The use
of supercapacitors to store energy and stabilize wind power fluctuations in
important frequency bands of wind farm output power has good application
prospects. During microgrid/grid microgrid operation, when the total power
generation capacity is less than the total load demand and at the same time it
enters island operation due to an external fault, the secondary load must be
removed in order to protect the important load. If the external fault is a
transient fault, in a short time The internal microgrid will be reconnected to
the main network due to the disappearance of the instantaneous fault, and the
secondary load will be restarted. From the perspective of power supply stability
and economy, it is unfavorable to secondary loads. Therefore, after an external
fault, supercapacitors can be used to provide short-term power deficits to the
microgrid operating in an island, maintaining all loads and waiting for the
fault to be repaired. Building/Elevator Energy Saving The energy consumption of
buildings in my country accounts for about 28% of the country's total energy
consumption. Among them, the electricity consumption of elevators is second only
to air conditioning, and much higher than the electricity consumption of
lighting, water supply, etc. The energy consumption of elevators has attracted
great attention from the industry, so energy saving of elevators has very
important practical significance. Therefore, research and development of
high-efficiency motor driving systems is the key to energy saving in elevators.
Energy feedback energy-saving elevators have relatively mature technology, but
due to price factors and impact on the power grid, promotion is still difficult.
The supercapacitor is directly connected to the DC bus to absorb the feedback
energy. The supercapacitor is directly connected to the DC bus of the frequency
converter. Supercapacitors have good application effects and advantages in
high-power electrical and electronic products, especially elevator products, and
their application prospects are unlimited. After reading the above content, what
do you gain? It can be said that the advantages of supercapacitor energy storage
are very obvious. In the future, it will definitely have very good development
prospects, and everyone can also seize the business opportunities of this
development.
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