Objective In traditional thermal power frequency regulation auxiliary services, the problems of insufficient power density and limited cycle life of the integrated energy storage systems have become the key bottlenecks restricting their large-scale development and urgently need to be addressed.

Method This study took the hybrid supercapacitor as the research object, summarized the advantages and disadvantages of the string-type and centralized energy storage methods, compared and analyzed the data differences caused by the material characteristics of lithium-ion batteries and supercapacitors, and presented an analysis of the advantages and development trends of string-type hybrid supercapacitors in thermal power frequency regulation.

Result The relevant data on the application of hybrid supercapacitors and string-type energy storage architecture in thermal power frequency regulation are elaborated. The research confirms that the string-type hybrid supercapacitor can effectively compensate for the limitations of traditional energy storage solutions, meet the requirements of thermal power frequency regulation for rapid response and long lifespan, and fundamentally improve the system's rapid response and cycle life.

Conclusion In the future, hybrid supercapacitor energy storage technology will become the main development trend in the field of thermal power frequency regulation, providing core support for the optimization of frequency regulation technologies in new-type power systems with a high penetration of renewable energy.