Establishment of mathematical model and operation strategy for energy storage in input type power system

According to wind power output curve, it can be seen that due to the significant influence of climate on wind power output, there is high degree of randomness and fluctuation in output, and there is no obvious characteristic pattern. From the historical wind power output curve of typical days during the peak season, it can be seen that in most years, wind power output is relatively high from 21:00 to 2:00 in the evening and relatively low from 14:00 to 17:00 in the afternoon. the wind power output shows the certain characteristic pattern: the cumulative wind power output is higher from21:00to2:00 in the evening, and relatively lower from 14:00 to 17:00 in the afternoon. The 1500MWdistributed photovoltaics were connected to the Chenjiaqiao Yuping area in the Chongqing load center area. Three permanent N-1 and N-2fault calculations were conducted on the 500KV AC line in Chongqing, and it was found that the power grid could maintain stable operation. After the fault, the voltage of each 500kV bus was restored to 0.9p.u. There was no disconnection of distributed power sources in the Chenjiaqiao Yuping area. Three permanent N-1 and N-2 fault calculations were conducted on each 220kV AC line within the Chenjiaqiao Yuping area power grid, and it was found that the power grid could maintain stable operation. After the fault, the voltage of each 220kV bus in the Chenjiaqiao Yuping area was restored to 0.9p.u., there was no disconnection of distributed power sources. The paper provides control modes, open-loop control and closed-loop PI control, which is used for simulation analysis of frequency regulation in wind farms.