Reactive Control Strategy for Wind Farm Considering Reactive Power Command

With more wind power integrated into power grid, its impact on voltage is larger so that the command that wind farm should support voltage and reactive power in wind power integrated region is required by system. Based on this, a reactive power compensation control method is proposed considering voltage and reactive power command in integrated region. The voltage of point of interconnection (POI) is chosen as controlled voltage and the related reactive power control is divided into three sections, namely, normal control, abnormal control and urgent control. Accordingly, three control modes are given, including abnormal control mode, urgent control mode and fault control mode. In implementation, average controlled voltage in a specific period is used to judge reactive power control section. Further, the control mode is confirmed according to average controlled voltage differences between two different periods and reactive power output of wind farm can be regulated reasonably to support the reactive power in wind power integrated region effectively by making controlled voltage and average voltage in a measuring cycle recover to the eligible voltage range in a few control cycles.