A novel current differential protection scheme for new energy transmission lines based on the magnitude of positive-sequence fault current components

DAI Zhihui; YANG Qiyue; WEI Shuqing; LIU Junyi; LUAN Kun

doi:10.19783/j.cnki.pspc.251095

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A novel current differential protection scheme for new energy transmission lines based on the magnitude of positive-sequence fault current components

更新时间：2026-05-14

- A novel current differential protection scheme for new energy transmission lines based on the magnitude of positive-sequence fault current components
- Power System Protection and Control Vol. 54, Issue 10, (2026)
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- DOI：10.19783/j.cnki.pspc.251095
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- Published：2026
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DAI Zhihui, YANG Qiyue, WEI Shuqing, et al. A novel current differential protection scheme for new energy transmission lines based on the magnitude of positive-sequence fault current components[J]. Power System Protection and Control, 2026, 54(10).
DOI：

DAI Zhihui, YANG Qiyue, WEI Shuqing, et al. A novel current differential protection scheme for new energy transmission lines based on the magnitude of positive-sequence fault current components[J]. Power System Protection and Control, 2026, 54(10). DOI： 10.19783/j.cnki.pspc.251095.

摘要

针对光伏场站低电压穿越期间受控输出特性导致送出线路传统纵差保护依赖的工频电流幅相关系失效、保护性能下降的问题，提出一种耐受高过渡电阻的新型电流纵差保护方案。首先，结合光伏场站低压穿越动态输出特性，分析了不同故障场景下送出线路区段两侧正序电流故障分量的相位特征，及其在高阻故障下表现出的前移现象。其次，利用故障区段两侧正序电流故障分量的综合幅值与相位差，分别构造了保护的动作量和自适应制动阈值，显著提升了保护对过渡电阻的耐受能力。最后，在 PSCAD/EMTDC 平台上搭建典型光伏场站送出线路模型进行多场景验证。结果表明：该方案灵敏度高，动作性能基本不受故障类型、故障位置及新能源接入容量的影响，在高阻故障下仍能可靠动作。

Abstract

To address the performance deterioration of conventional longitudinal current differential protection for transmission lines during low-voltage ride-through (LVRT) operation of photovoltaic (PV) plants

where controlled output behavior invalidates power-frequency current amplitude relationships

a novel current differential protection scheme with enhanced tolerance to high transition resistance is proposed. First

considering the dynamic output characteristics of PV plants under LVRT conditions

the phase characteristics of the positive-sequence fault current components at both terminals are analyzed under various fault scenarios

along with the phase-advance phenomenon under high-resistance faults. Then

a protection operating index and an adaptive restraining criterion are constructed by combining magnitude and phase differences of the positive-sequence fault current components at both ends of the faulted line section

thereby significantly enhancing the protection's tolerance to transition resistance. Finally

a representative PV plant transmission line model is built in PSCAD/EMTDC for validation under multiple scenarios. The results demonstrate that the proposed scheme offers high sensitivity

weak dependence on fault type

fault location

and new energy penetration level. It can still operate reliably under high-resistance faults.

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references

MANNAN A R, VINOD K, SHAWKY M M E. A new fault ride-through (FRT) topology for induction generator based wind energy conversion systems[J]. IEEE Transactions on Power Delivery, 2019, 34(3): 1129-1137.

WU C, MU L, FANG C. Adaptive current differential protection of line for active distribution networks considering PV output[J]. Electric Power Systems Research, 2025, 251.

LI Botong, ZHENG Dingchuan, LI Bin, et al. Analysis of low voltage ride-through capability and optimal control strategy of doubly-fed wind farms under symmetrical fault[J]. Protection and Control of Modern Power Systems, 2023, 8(2): 585-599.

YU Feng, HUANG Wen, JIN Zhangtao, et al. Voltage support strategy for improving power transfer capability of grid-connected converter under unbalanced conditions[J]. IEEE Transactions on Power Electronics, 2024, 39(7): 7863-7875.

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