全球能源互联网（英文）2021，Vol.4Issue(6)：531-542,12.DOI:10.14171/j.2096-5117.gei.2021.06.001
基于输入阻抗幅值的柔性直流电网主动注入式保护方案
Active injection protection scheme for f l exible HVDC grids based on amplitude of input impedance
摘要
Abstract
High-voltage direct current (HVDC) grids require fast and reliable protection of the DC lines. The performance of traditional protection schemes is easily impaired by the limitations of the boundary condition and nonlinearity from the control of converters. One of the key technologies for flexible HVDC grids is the half-bridge modular multilevel converter (HB-MMC). Considering the high controllability of HB-MMC, this study proposes an active injection protection scheme to improve the reliability and sensitivity of the HVDC grid protection. The HB-MMC is used to inject a sinusoidal characteristic signal, at the specified frequency, into the DC lines. Then, the voltage and current at the specified frequency are extracted using the Prony algorithm to calculate the input impedance, which is used for the identification of internal and external faults. The active injection protection scheme was simulated for various cases in the simulation software Power Systems Computer Aided Design. The simulation results indicate that the proposed protection scheme is highly reliable and can overcome transition resistance.关键词
半桥型模块化多电平换流器/柔性直流电网/主动注入/特征信号/输入阻抗Key words
HB-MMC/Flexible HVDC grids/Active injection/Characteristic signal/Input impedance引用本文复制引用
和敬涵,陈可傲,李猛,汤涌,聂铭..基于输入阻抗幅值的柔性直流电网主动注入式保护方案[J].全球能源互联网（英文）,2021,4(6):531-542,12.基金项目
This work is supported by the Fundamental Research Funds for the Central Universities(No.2020YJS169).The National Natural Science Foundation of China-State Grid Joint Fund for Smart Grid(No.U2066210). （No.2020YJS169）
