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Application of supercapacitor farad capacitor in smart grid
Aug 13, 2018

1. Provide short-term power supply


There are two typical modes of operation in the microgrid: under normal circumstances, the microgrid and the conventional distribution network are connected to the grid, which is called the grid-connected operation mode; when the grid fault is detected or the power quality is not met, the microgrid will be timely The grid is disconnected and operated independently, called the isolated mode. Microgrid often needs to absorb some of the active power from the conventional distribution network. Therefore, when the microgrid is switched from the grid-connected mode to the isolated mode, there will be power shortage. Installing the energy storage device will help the smooth transition of the two modes.


2. Used as an energy buffer


Due to the small scale of the microgrid, the inertia of the system is not large, and the network and load often fluctuate very much, which has an impact on the stable operation of the entire microgrid. We always expect high-efficiency generators (such as fuel cells) in the microgrid to always operate at its rated capacity. However, the load on the microgrid does not remain constant throughout the day. Instead, it fluctuates as the weather changes. In order to meet the peak load supply, peak load adjustment must be carried out using a fuel-and-gas peaking power plant. Due to the high fuel price, the operation cost of this method is too expensive. The supercapacitor energy storage system can effectively solve this problem. It can store excess power of the power supply when the load is low, and feed back to the micro grid to adjust the power demand when the load is high. The high power density and high energy density of the supercapacitor make it the best choice for handling peak loads, and the use of supercapacitors requires only the storage of energy equivalent to the peak load.


3. Improve the power quality of the microgrid


The energy storage system plays an important role in improving the power quality of the microgrid. Through the inverter control unit, the reactive power and active power provided by the supercapacitor energy storage system to the user and the network can be adjusted, thereby achieving the purpose of improving the power quality. Because supercapacitors can quickly absorb and release high-power electric energy, it is very suitable to be applied to the power quality adjustment device of the micro-grid to solve some transient problems in the system, such as instantaneous power failure and voltage swell caused by system failure. Problems such as voltage dips, etc. At this time, supercapacitors are used to provide fast power buffering, absorbing or supplementing electric energy, and providing active power support for active or reactive power compensation to stabilize and smooth fluctuations in grid voltage.


4. Optimize the operation of the micro power supply


Green energy sources such as solar energy and wind energy tend to have unevenness, and the power output is subject to change. This requires the use of a buffer to store energy. Since the energy output generated by these energy sources may not meet the peak power requirement of the microgrid, the energy storage device can be used to provide the required peak power in a short time until the power generation is increased and the demand is reduced. A proper amount of energy storage can make a transition if the DG unit is not functioning properly. For example, during nighttime when solar power is used, wind power is in the absence of wind, or other types of DG units are in service, when the energy storage in the system can play a role.


In the case where the process of energy generation is stable and the demand is constantly changing, it is also necessary to use an energy storage device. By storing excess energy in the energy storage device, it is possible to provide the required peak energy through the energy storage device in a short time.

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