Energy storage system assisted thermal power unit frequency regulation is limited by the capacity of storage device

and its output power can not track the command power for a long time. At the same time

lithium battery energy storage technology also exists problems in safety hazards

cycle life limitations

limited enhancement of unit frequency gain gain and other issues. For this reason

the characteristics of high cycle life and high safety of supercapacitor are used to construct the simulation model of hybrid energy storage system assisted coal-fired thermal power unit frequency regulation in Matlab/Simulink platform. Combining with the operating state of thermal power unit and energy storage system

a set of control strategy based on index calculation and fuzzy control synergy is designed to achieve the adaptive adjustment of hybrid energy storage system output under dynamic operating conditions. Simulations show that

the control strategy can effectively extend the service life of lithium batteries and efficiently utilize the residual power of the hybrid energy storage system. Compared with the conventional control strategy of hybrid energy storage system

the proposed control strategy reduces the average daily use time of lithium battery by 60%

improves the comprehensive index of frequency regulation performance by 34%

and increases the average daily revenue by 20 000 yuan

which has high engineering application value.