高电压技术2025，Vol.51Issue(2)：489-506,18.DOI:10.13336/j.1003-6520.hve.20241468
沙戈荒大规模可再生能源基地经构网柔直送出系统中交流继电保护面临的挑战与对策
Challenges and Countermeasures of the AC Relay Protection in Grid-forming MMC Integrated with Large-scale Renewable Generations in Deserts
摘要
Abstract
It is a major strategic need for our nation to develop the large-scale wind and photovoltaic power in desert or the deep-sea regions.Modular multilevel converter-based high voltage direct current(MMC-HVDC)is considered as the mainstream solution for long-distance power delivery.However,in the grid-forming MMC integrated with renewable generations,on the one hand,the characteristics of faults have significantly changed.On the other hand,the difficulty of relay protection has greatly increased,thereby threatening the secure recovery of the system.We focus on the scenarios of large-scale renewable energy transmission via MMC-HVDC,present the challenges faced by such a system,and describle how to accurately calculate fault characteristics,reliably identify fault zones,and rapidly and safely recove the system.Moreover,we summarize the current research status on three key issues:the inaccurate fault characteristic calculations,unreliable fault area identification,and difficulties in secure fault recovery.Finally,we explore the potential solutions from three aspects:model-based iterative fusion,protection scheme based on or independent of the source characteristics,and the coordination strategy of the control and protection.The research can provide reference for the control and protec-tion of large-scale renewable energy transmission systems in desert region.关键词
构网/继电保护/新能源/模块化多电平变流器/控保协同技术/故障特性计算Key words
grid-forming/relay protection/renewable energy/MMC/coordination strategy of relay protection and control/fault characteristic calculation引用本文复制引用
李岩,周博昊,何佳伟,曹润彬,郑涛..沙戈荒大规模可再生能源基地经构网柔直送出系统中交流继电保护面临的挑战与对策[J].高电压技术,2025,51(2):489-506,18.基金项目
国家自然科学基金联合基金(U23B20112) （U23B20112）
国家自然科学基金(52207129).Project supported by Joint Funds of the National Natural Science Foundation of China(U23B20112),National Natural Science Foundation of China(52207129). （52207129）
