西安工程大学学报2024，Vol.38Issue(2)：9-17,9.DOI:10.13338/j.issn.1674-649x.2024.02.002
改进巴氏距离算法下混合级联直流输电纵联阻抗保护优化
Optimization of longitudinal impedance protection for hybrid cascaded HVDC transmission under improved Bhattacharyya distance algorithm
摘要
Abstract
To enhance the robustness of longitudinal protection in LCC-MMC hybrid cascaded HVDC transmission systems,a longitudinal protection scheme of HVDC transmission based on longitudinal impedance and improved Bhattacharyya distance algorithm was proposed.The differ-ence of the electric capacity at the first and last ends of the protected line was quantified by com-bining the Bhattacharyya distance algorithm with longitudinal impedance protection in this scheme,and the faults inside and outside the area were determined through the quantified data.Then,the fault pole selection criterion was constructed based on the energy function to ensure the reliability of the protection.Furthermore,an improved adaptive sliding window was constructed by fractal dimension,which improved the rapidity of protection.Finally,the±800 kV LCC-MMC hybrid cascaded HVDC transmission system model of"Baijiang Project"was established on Mat-lab and PSCAD/EMTDC platforms,and the improved protection scheme was verified.Simulation results show that the proposed protection scheme can identify faults inside and outside the region quickly and reliably,correctly select fault poles and has a better resistance to transition resist-ance.关键词
混合级联直流输电/故障特性/纵联保护/纵联阻抗/巴氏距离算法/分形理论Key words
hybrid cascaded DC transmission/fault characteristic/longitudinal protection/longi-tudinal impedance/Bhattacharyya distance algorithm/fractal theory分类
信息技术与安全科学引用本文复制引用
王书征,李沛林,杨军炜,张金华,施渊,刘康礼..改进巴氏距离算法下混合级联直流输电纵联阻抗保护优化[J].西安工程大学学报,2024,38(2):9-17,9.基金项目
国家自然科学基金(52107098) （52107098）
