基于状态估计的大规模新能源送出线路纵联保护  

Pilot Protection of Large-scale Renewable Energy Transmission Lines Based on State Estimation

作　　者：聂铭 李猛 和敬涵[1] 刘颖 王紫琪 宋晓帆 李强 NIE Ming;LI Meng;HE Jinghan;LIU Ying;WANG Ziqi;SONG Xiaofan;LI Qiang(School of Electrical Engineering,Beijing Jiaotong University,Haidian District,Beijing 100044,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Changping District,Beijing 102209,China;Economic and Electrical Research Institute of Henan Electrical Power Company of SCCC,Zhengzhou 450000,Henan Province,China;Economic and Electrical Research Institute of Shanxi Electrical Power Company of SCCC,Taiyuan 030024,Shanxi Province,China)

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]国网经济技术研究院有限公司,北京市昌平区102209 [3]国网河南省电力公司经济技术研究院,河南省郑州市450000 [4]国网山西省电力公司经济技术研究院,山西省太原市030024

出　　处：《电网技术》2024年第5期2189-2198,I0113,I0114,共12页Power System Technology

基　　金：国家电网有限公司科技项目(5200-202256081A-1-1-ZN)。

摘　　要：“双碳”背景下,加快构建清洁低碳、安全高效的能源体系,已成为国家重大需求。但是,新能源电源等值内电势不稳定,与传统同步机电源特性存在本质差异,换流器控制导致故障电流幅值受限、相位受控,现有工频量保护性能下降,威胁电网安全稳定。该文提出基于状态估计的大规模新能源送出线路纵联保护原理,在考虑线路分布电容的基础上建立精确的线路模型,利用瞬时值的状态估计冗余特性提升了保护的速动性和可靠性,通过比较所建模型与实际模型匹配程度判别故障。仿真表明,所提保护方法能快速可靠判别各种类型的区内、外故障,保护判别时间不超过2ms,并具有较好的耐过渡电阻和抗干扰能力。Under the background of"carbon peak and neutrality",it has become a major national demand to accelerate the construction of a clean,low-carbon,safe and efficient energy system.However,the renewable energy power supply has an unstable equivalent internal potential,which is fundamentally different from the power supply characteristics of the traditional synchronous generators.The converter control leads to the fault current amplitude being limited and phase being controlled,decreasing the performance of the existing protection methods based on the 50Hz component and threatening the safety and stability of the power grid.This paper proposes a pilot protection of large-scale renewable energy transmission lines based on the state estimation.An accurate line model is built having the consideration of the line distributed capacitance,and the redundancy feature of the dynamic state estimation based on the instantaneous values is used to enhance the quick action and reliability of the protection.The faults are identified by comparing the matching degrees between the proposed model and the actual model.Simulation results show that the proposed protection is able to quickly and reliably identify various types of the internal and external faults within 2ms,and has a better ability to withstand the transition resistances and interferences.

关 键 词：新能源电源 纵联保护 状态估计 贝瑞隆模型 

分 类 号：TM721[电气工程—电力系统及自动化]