适用于新能源外送混合多馈入系统差动保护新方案

高淑萍; 李晓芳; 宋国兵; 郑瀚; 段云青

doi:10.19912/j.0254-0096.tynxb.2024-0095

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (5) : 136-148. DOI: 10.19912/j.0254-0096.tynxb.2024-0095

适用于新能源外送混合多馈入系统差动保护新方案

高淑萍^1,2, 李晓芳^1,2, 宋国兵³, 郑瀚^1,2, 段云青^1,2

作者信息 +

NEW DIFFERENTIAL PROTECTION SCHEME APPLICABLE TO HYBRID MULTI-INFEED SYSTEMS FOR RENEWABLE ENERGY TRANSMISSION

Gao Shuping^1,2, Li Xiaofang^1,2, Song Guobing³, Zheng Han^1,2, Duan Yunqing^1,2

Author information +

文章历史 +

摘要

为保证光伏、风电等新能源进一步适应远距离输送、多落点集中的场景,搭建包含电网换相换流器-电压源换流器（LCC-VSC）和电网换相换流器-模块化多电平换流器（LCC-MMC）的新型混合直流多馈入电力系统,针对由新能源直流多馈入引起的故障分量判据区内高阻拒动和全电流判据灵敏度下降问题,基于不同的交流线路故障,提出消除直流馈入分量和负载电流的交流系统电流差动保护优化方案。在PSCAD/EMTDC上进行仿真输出故障数据,利用Matlab对故障数据进行处理和验证保护算法,仿真结果证明：与传统保护方法相比,改进后的方案能区分区内外故障并正确动作,在区内高阻接地时也能可靠动作,具有灵敏度高、耐过渡电阻能力强和不受分布电容影响等特点。

Abstract

To ensure that renewable energy sources, such as photovoltaics and wind power, can further adapt to long-distance transmission and scenarios with multiple concentrated landing points, this paper constructs a novel hybrid DC multi-infeed power system consisting of LCC-VSC and LCC-MMC. Aiming at the problems of high impedance rejection in the fault component criterion area and the decreased sensitivity of the full current criterion caused by the multi-infeed of renewable energy DC, an optimized scheme for AC system current differential protection is proposed based on different AC line faults, which eliminates DC infeed components and load currents. The simulation output fault data is generated on PSCAD/EMTDC, and the protection algorithm is verified by using MATLAB to process the fault data. The simulation results proved that the improved scheme could identify internal and external faults and operate correctly. Compared with the traditional protection method, it can operate reliably when grounded in high resistance, and it has the characteristics of high sensitivity, strong resistance to transition resistance and can not be affected by distributed capacitance.

导出引用

高淑萍, 李晓芳, 宋国兵, 郑瀚, 段云青. 适用于新能源外送混合多馈入系统差动保护新方案[J]. 太阳能学报. 2025, 46(5): 136-148 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0095

Gao Shuping, Li Xiaofang, Song Guobing, Zheng Han, Duan Yunqing. NEW DIFFERENTIAL PROTECTION SCHEME APPLICABLE TO HYBRID MULTI-INFEED SYSTEMS FOR RENEWABLE ENERGY TRANSMISSION[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 136-148 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0095

中图分类号： TM77

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