Super capacitor is an energy storage device with high power density

fast charging and discharging speed and long cycle life. Aiming to effectively and economically improve the responsiveness of primary frequency modulation of thermal power unit under deep peaking

the scheme of primary frequency modulation technology of super capacitor assistant is proposed. Based on the current demand of power grid frequency modulation and primary frequency modulation capability of the power units

the power and capacity of super capacitor needed by unit are analyzed. The result shows that

through reasonable selection

connection and control

the operation opening of main steam regulating valve can be increased further

and the coal consumption can reduce by about 1.0 g/(kW·h). The economic benefit is considerable

and the project investment can be recovered within 4.3 years. The super capacitor aided technology in this study can be applied to the optimization of primary frequency modulation of thermal power units and the technological transformation projects of improving the flexibility of thermal power units.