This dataset includes the actual operational data from twelve wind turbines at Zhangbei wind farm in Hebei province, China. The SCADA data of twelve wind turbines was collected at 60-second intervals from March 2014 to March 2015. The specification of the wind turbines in the wind farm is as follows: the cut-in wind speed is 1m/s, the rated wind speed is 12m/s, the cut-out wind speed is 25m/s, and the rated power is 1500kW. four simulated data manually generated for data cleaning.