AUTHOR=Li Peng , Xi Wei , Yin Xianggen , Zeng Xiangjun , Li Licheng , Yang Qixun , Chen Wei 

TITLE=A Specialized System-on-Chip Based Distance Protection for Distribution Grids with Inverter Interfaced Distributed Generation

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 8 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2020.614292

DOI=10.3389/fenrg.2020.614292

ISSN=2296-598X

ABSTRACT=The legacy protection schemes face new challenges as the Inverter Interfaced Distribution Generation (IIDG) significantly changes the transient fault response of the distribution grid. The performance of the protection near the IIDG side is adversely affected by the Low Voltage Ride Through (LVRT) and the negative sequence current suppression control characteristics of the IIDG. The operational characteristics of that protection are very different from those of the legacy protection schemes used in the distribution grid. The traditional overcurrent protection schemes cannot meet the requirements of selectivity and sensitivity. In this paper, the influence of the IIDG on protection schemes used in the distribution grid is analyzed. Based on the positive sequence voltage polarization impedance criterion, a polarizing impedance criterion based on the fault component of positive sequence voltage, which can adaptively follow the fault resistance variation, is proposed to satisfy the requirements of grid operation. The simulation results show that: (a) the proposed criterion is immune to the adversely effects of the transient characteristics of the IIDG, and (b) it can adaptively follow the change of fault resistance which is suitable for the application in short distribution lines. Using the specialized System-on-Chip technology, a new distance protection device has been developed and tested on an industrial site. The new device for distance protection meets the requirements of the distribution grid with IIDGs.