Fig.1

Structure of the OWP-UWCAES system

Table 1

Levels of wind power and their probabilities

Fig.2

Output power model of the wind-power station

Fig.3

Dimensionless mechanical efficiency of a typical turbine

Fig.4

Relationship between dimensionless mechanical efficiency and mass flow rate of a typical turbine

Table 2

Basic parameters of the system

Fig.5

Weekly variation of the compressed air mass in the air storage device under system design condition

Fig.6

Weekly variation of the heat transfer oil mass under system design condition

Fig.7

Percentage value of the power output of the wind turbine from 00：00 to 24：00

Fig.8

Total power output of wind turbines from 00：00 to 15：00

Fig.9

Mass variation of the compressed air in the air storage system from 00：00 to 24：00

Table 3

Parameters of the system in different time intervals under variable working condition

Fig.10

Simulated daily load curve of an island

Table 4

Costs of the system

Fig.11

Monthly failure number of the equipment

Table 5

Daily power generation and income of the system without fault

Fig.12

Operation cost and revenue of the system taking revenue model 1

Fig.13

Daily power output of the wind-power station

Fig.14

Energy storage and release curves of the system

Fig.15

Operation cost and revenue of the system taking revenue model 2

Fig.16

Sensitivity analysis of revenue model 1

Fig.17

Sensitivity analysis of revenue model 2