| 引用本文: | 贾 科,黄心怡,毕天姝,等.连接新能源汇集系统的柔直换流站短路电流解析计算[J].电力系统保护与控制,2026,54(03):167-176.[点击复制] |
| JIA Ke,HUANG Xinyi,BI Tianshu,et al.Analytical calculation of short-circuit currents in MMC-HVDC converter stations connected to renewable energy collection systems[J].Power System Protection and Control,2026,54(03):167-176[点击复制] |
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| 摘要: |
| 新能源通过柔直换流站(modular multilevel converter-based high-voltage direct current, MMC-HVDC)送出的汇集线路发生短路故障时，由于线路两侧电力电子电源提供的短路电流相互耦合，故障特性随机变化，难以准确计算，保护整定配置困难，亟待提出新的短路电流分析计算方法。现有的短路电流计算方法未充分考虑新能源与柔直换流站之间的耦合影响，难以保证暂态阶段的计算精度。针对上述问题，采用线性分区思想解决新能源侧对柔直换流站的耦合影响，提出序导纳代换的数学方法实现对故障点电压的间接解析。根据电流与电压映射关系解析计算柔直侧的故障电流。基于硬件在环实验平台，搭建了新能源汇集系统接入柔直换流站的测试系统。对比不同故障场景下所提方法与传统方法的计算误差，结果表明所提方法的计算误差均小于5%，验证了方法的有效性。 |
| 关键词: 柔直输电 汇集线路 故障电流解析 序导纳代换 |
| DOI：10.19783/j.cnki.pspc.250545 |
| 投稿时间：2025-05-22修订日期：2025-08-18 |
| 基金项目:国家重点研发计划项目资助(2022YFB4202302) |
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| Analytical calculation of short-circuit currents in MMC-HVDC converter stations connected to renewable energy collection systems |
| JIA Ke,HUANG Xinyi,BI Tianshu,ZHANG Tianxin,LIU Haolin,LI Zainan |
| (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
(North China Electric Power University), Beijing 102206, China) |
| Abstract: |
| When a short-circuit fault occurs on the collection line through which renewable energy is transmitted via a modular multilevel converter-based high-voltage direct current (MMC-HVDC) stations, the short-circuit currents supplied by power electronic converters on both ends of the line are mutually coupled. This coupling leads to random variations in fault characteristics, making accurate calculation difficult and complicating protection setting and coordination. Consequently, new methods for short-circuit current analysis and calculation are urgently needed. Existing short-circuit current calculation methods do not adequately account for the coupling effects between renewable energy sources and MMC-HVDC converters, and thus cannot ensure sufficient accuracy during transient states. To address these limitations, this paper proposes a novel analytical approach that adopts a linear partitioning concept to decouple the interaction between renewable energy sources and the MMC-HVDC station. A mathematical method based on sequence admittance substitution is proposed to indirectly obtain an analytical expression for the fault point voltage. The MMC-HVDC side fault current is then derived through current-voltage mapping relationships. A test system in which a renewable energy collection system is connected to an MMC-HVDC station is established on a hardware-in-the-loop experimental platform. By comparing the calculation errors of the proposed method with those of conventional methods under various fault scenarios, the results demonstrate that the proposed method maintains calculation errors below 5%, thereby verifying its effectiveness. |
| Key words: MMC-HVDC transmission collection line fault current analysis sequential admittance substitution |
