Phase selection capacity recovery strategy for full-scale new energy grid based on coordinated control and protection

Authors

Lin ZHANG, Electric Power Research Institute, State Grid Chongqing Electric Power Company, Chongqing 401123, China
Hongbin WANG, Electric Power Research Institute, State Grid Chongqing Electric Power Company, Chongqing 401123, China
Xun CHEN, Electric Power Research Institute, State Grid Chongqing Electric Power Company, Chongqing 401123, China
Xiangning LIN, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Zhengtian LI, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaFollow
Fanrong WEI, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Keywords

islanded system; phase selection of phase current difference mutation; fault component regulation; coordinated control and protection; adaptability analysis

Abstract

The negative-sequence suppression control strategy and low-voltage ride-through control strategy are adopted when the inverter-based power supply fails, which leads to a serious inequality between the distribution coefficients of positive- and negative-sequence currents at the energy storage station side in a full-scale new energy system, resulting in incorrect phase selection of the phase current difference mutation element. Based on the fault sequence component network, the constraint condition for the correct phase selection of the phase current difference mutation element is derived. A phase selection performance recovery scheme based on fault component regulation is proposed, which can eliminate the degradation of phase selection performance at the energy storage side caused by unequal distribution coefficients of positive- and negative-sequence currents. Simulation results show that the proposed scheme restores the performance of the traditional current mutation phase selection element at the energy storage side in a full-scale new energy system, enabling existing current mutation phase selection schemes to remain applicable to high-penetration and even full-scale new energy grids.

DOI

10.19781/j.issn.1673-9140.2026.01.006

First Page

53

Last Page

62

Recommended Citation

ZHANG, Lin; WANG, Hongbin; CHEN, Xun; LIN, Xiangning; LI, Zhengtian; and WEI, Fanrong (2026) "Phase selection capacity recovery strategy for full-scale new energy grid based on coordinated control and protection," Journal of Electric Power Science and Technology: Vol. 41: Iss. 1, Article 6.
DOI: 10.19781/j.issn.1673-9140.2026.01.006
Available at: https://jepst.researchcommons.org/journal/vol41/iss1/6