中国电机工程学报2024，Vol.44Issue(22)：9014-9026,中插27,14.DOI:10.13334/j.0258-8013.pcsee.240444
混合级联换流站直流短路故障解析计算与快速限流方法
DC Fault Analytic Calculation and Fast Current Limiting Method for Hybrid Cascaded Converter Station
摘要
Abstract
In the field of high-voltage,large-capacity,long-distance transmission,the hybrid converter topology has more technical advantages than the single converter.In order to cope with extremely hazardous DC short-circuit faults,the DC short-circuit fault traversal capability of the converter needs to be considered as a priority.First,this paper proposes a hybrid cascade topology with DC short-circuit fault ride-through capability based on line commutated converter(LCC)and modular multilevel converter(MMC).The DC short-circuit fault current limiting control method is then presented.Then,by analyzing the dynamic characteristics of the converter during a DC short-circuit fault,a mathematical model of the staged equation of state is constructed to realize the accurate analytical calculation of the DC short-circuit fault current.Next,the most serious DC short-circuit fault condition is selected,and the dynamic optimization calculation mechanism of forced triggering angle parameters is given by taking the maximum allowable current change as the criterion and combining with the proposed DC short-circuit fault current calculation method.Finally,a fast current-limiting control strategy is proposed based on the optimized design of the forced triggering angle,which ensures that the LCC avoids commutation failure during DC short-circuit fault ride-through,and reduces the fault current quickly.关键词
电网换相换流器/模块化多电平换流器/混合级联换流器/直流短路故障穿越/故障电流计算Key words
line commutated converter(LCC)/modular multilevel converter(MMC)/hybrid cascaded converter/DC short-circuit fault ride-through/fault current calculation分类
信息技术与安全科学引用本文复制引用
李云丰,张佳琳,魏晓光,孔明,曹一家,许杰锋..混合级联换流站直流短路故障解析计算与快速限流方法[J].中国电机工程学报,2024,44(22):9014-9026,中插27,14.基金项目
国家自然科学基金项目(U23B20128,52207187) （U23B20128,52207187）
湖南省研究生科研创新项目(CX20230897). Project Supported by National Natural Science Foundation of China(U23B20128,52207187) （CX20230897）
Postgraduate Scientific Research Innovation Project of Hunan Province(CX20230897). 感谢"湖湘青年英才"(2023RC3145)和湖南省教育厅优秀青年基金项目(22B0308)对本文研究提供资金资助. （CX20230897）
