The installation has completed a full cycle of standard tests and received a certification from the Chinese CNAS body, which is recognized internationally. According to the developers, this is China’s first supercapacitor system of this class and the world’s first fully carbon-based containerized unit of similar power.
Unlike lithium-ion batteries, supercapacitors have lower energy density but operate at extremely high speeds. They can respond to load changes in under 10 milliseconds, endure over 1 million charge/discharge cycles, and work efficiently at very high switching frequencies.
These features make them especially suitable for frequency regulation in power grids, where storage systems may undergo hundreds of charge-discharge cycles daily.
The system is built around proprietary supercapacitors with a capacitance of 4,500 Farads. Their specific energy density is 16 Wh/kg, and their specific power is 18 kW/kg.
In total, the installation includes 22,400 supercapacitor cells. Thanks to an active balancing system, the efficiency exceeds 95%, and the voltage variation between cells stays under 64 mV.
The developers highlight that a key advantage of the technology is the absence of lithium dendrite formation risk, minimal fire hazard, and stable performance at low temperatures compared to traditional lithium-ion batteries.
The first deployment site will be the independent Dongyue energy storage system in Qinghai Province. There, the unit will be used for ultra-fast grid regulation without the need for component replacement over its entire service life.
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