基于过渡电阻倾斜角的风电T接双电源系统自适应距离保护方案OACSTPCD

In view of the situation that the traditional distance protection may misoperate and refuse to operate after the wind power T-type is connected to the high-voltage distribution network,it is of great significance to study the correspond-ing protection scheme.First of all,this paper deduces the expressions of measurement impedance of upstream and down-stream of wind power T-connection,and concludes that the additional impedance contained in it may make the traditional protection device not operate correctly.In view of this,an adaptive distance protection scheme of wind power T-connection system based on transition resistance inclination angle is proposed in this paper.The scheme can adaptively modify the measurement impedance so that it can track the short-circuit impedance and effectively eliminate the influence of addition-al impedance on distance protection.Finally,the scheme is verified by MATLAB simulation software.The results show that the proposed scheme is less affected by the fault location,transition resistance,power phase difference and wind pow-er operation mode,which can effectively solve the problem of refusing to operate or misoperation of traditional distance protection,and improve the security and stability of power grid.