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The role of supercapacitors in power grid stability is mainly reflected in the following aspects. Firstly, instantaneous power support, and secondly, frequency regulation. Then there is peak shaving and valley filling, followed by improving the integration of renewable energy. Next is the restoration of power grid faults, and finally the balancing of voltage fluctuations. In addition, supercapacitors can also reduce reliance on traditional power generation equipment. Overall, supercapacitors play an important auxiliary role in grid stability, improving the flexibility, reliability, and efficiency of the power system.