Active injection protection scheme for flexible HVDC grids based on amplitude of input impedance

Jinghan He; Keao Chen; Meng Li; Yong Tang; Ming Nie

doi:10.1016/j.gloei.2022.01.002

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Active injection protection scheme for flexible HVDC grids based on amplitude of input impedance

Protection and Control Technologies of New Power System | 更新时间：2026-09-21

- Active injection protection scheme for flexible HVDC grids based on amplitude of input impedance
- Global Energy Interconnection Vol. 4, Issue 6, Pages: 532-542(2021)
- 作者机构：
  
  1. Beijing Jiaotong University, Haidian District,Beijing,PR China,100044
  2. China Electric Power Research Institute, Haidian District,Beijing,P.R. China,100192
- 作者简介：
- 基金信息：
- DOI：10.1016/j.gloei.2022.01.002
  CLC：
- Online First：08 March 2022，
  
  Published：2021
- 稿件说明：
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Jinghan He, Keao Chen, Meng Li, et al. Active injection protection scheme for flexible HVDC grids based on amplitude of input impedance[J]. Global Energy Interconnection, 2021, 4(6): 532-542.
DOI：

Jinghan He, Keao Chen, Meng Li, et al. Active injection protection scheme for flexible HVDC grids based on amplitude of input impedance[J]. Global Energy Interconnection, 2021, 4(6): 532-542. DOI： 10.1016/j.gloei.2022.01.002.

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.

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