The economic benefits of different energy storage systems were analyzed from various aspects in this paper. Based on the leveling model

the average generation cost of thermal power network at partial load was calculated and analyzed

including coal-fired and combined cycle units. Then

the fuel consumption variation characteristics of power system were analyzed when the energy storage systems participate in peak-shaving of power grid. For three energy storage systems

including the pumped storage

compressed air storage and battery storage

the economic research was carried out from the resource benefit side

the social benefit side and the investment profit side. The influence of fuel consumption

installed capacity

peak-valley price difference

environmental benefit and dynamic regulation of power grid on the comprehensive economic benefit of the energy storage system and the economy of energy storage investment were analyzed. Comprehensively considering the effect of valley filling ratio

the economic benefits of the above three systems participating in peak-shaving compared with the conventional peak-shaving were given from different aspects. When the valley filling ratio was 20%

the fuel energy-saving benefits of peak-shaving of the above three systems could reach 0.001～0.030 yuan/(kW·h)

and the benefits mainly came from the increase of load rate of thermal power units in low valley.From the social benefits side

the comprehensive benefit of the three systems could reach 0.14～0.23 yuan/(kW·h)

of which the peak-valley price difference benefit was the main benefit

accounting for 58%～76% of the total benefit. From the investment side

the profit could be realized only when the difference of peak-valley price of the pumped storage

compressed air storage and battery storage system reached higher than 0.42

0.452 and 0.82 yuan/(kW·h).