Protection assessment in electrical distribution grids based on state estimation

The Journal of Engineering

Thomas Offergeld¹ 

[1] Institute for High Voltage Technology, RWTH Aachen University , Aachen , Germany

关键词: protective devices;    grid faults;    protection assessment;    inverter;    regression analysis;    distributed generation units;    electrical distribution grids;    grid state;    distribution system state estimation;   

DOI  :  10.1049/joe.2018.0159

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

The increasing number of inverter interfaced distributed generation units in electrical distribution grids can influence the functionality of protective devices in case of grid faults. The result can be an inadmissible delay in tripping time or failure to trip altogether. This study describes a novel approach to identify and amend potentially unreliable protection configurations. Reliance on conservative worst-case approximations of the grid state is avoided by using distribution system state estimation instead. Thereby, protection configurations can be more accurately matched to the specific grids' requirements. The overall computational effort is reduced using methods of regression analysis while maintaining original accuracy.

【 授权许可】

CC BY