逆变型新能源场站送出线时域方向元件

Time-domain Directional Components for Transmission Lines of Inverter-interfaced Renewable Energy Plant

逆变型新能源暂态故障特征可能导致送出线保护近区故障时现有距离保护方向元件不正确动作。基于逆变型新能源故障期间输出的正序无功电流特征,文中提出了适用于逆变型新能源场站送出线的故障方向判据,通过比较故障时保护安装处正序无功电流计算值与参考值之间的欧氏距离区分正、反向故障。仿真结果表明,提出的方向元件在各种故障场景下都能够准确地判断保护近区故障方向。

The transient fault characteristics of inverter-interfaced renewable energy(IIRE)may lead to the misoperation of existing directional component for distance protection with near-end faults of transmission line.Based on the characteristics of positive sequence reactive current output during IIRE faults,a fault directional criterion suitable for the transmission line of IIRE plant is proposed.By comparing the Euclidian distance between the calculated value of positive sequence reactive current at the installation of protection and the reference value,the forward and reverse faults are distinguished.The simulation results show that the proposed directional component can accurately judge the fault direction in the near area of protection in various fault scenarios.