Abstract：Recent advancements in high-precision measurement devices，such as mirco-phase measurement

unit（μPMU），offer technical support for regional protection schemes. However，deploying μPMU across all

network nodes remains impractical due to economic and practical constraints. Therefore，under low-resistance

grounded distribution network conditions，a node zero-sequence voltage estimation method was proposed under

limited μPMU deployment. Furthermore，this method was applied to estimate unknown zero-sequence voltages at

nodes within fault regions，enabling calculation of the relative position coefficient α between fault points and

regional lines. Based on α，a fault line identification criterion was established，forming a regional protection

scheme. Finally，simulation results validate the effectiveness of the proposed method.

        Key words：distribution network regional protection；zero-sequence voltage estimation；limited measurement；inverter interfaced distributed generator （DG）

     Format Citation:李娟，姜云龙，朱睿,等. 有限量测下基于零序电压推算的有源配电网区域保护方法[J].电气传动,2026,56(08):49-58. LI Juan，JIANG Yunlong，ZHU Rui,et al. Zero-sequence voltage estimation based regional protection method for active distribution networks under limited measurement [J].Electric Drive, 2026,56(08): 49-58