交直流混合有源配电系统保护方案研究  

Protection scheme-for hybrid AC/DC power distribution system

作　　者：陈丽安[1] 赵航[2] 肖业湘[3] 李正天[2] 

机构地区：[1]厦门理工学院福建省高电压技术重点实验室,福建厦门361024 [2]华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074 [3]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《电力科学与技术学报》2015年第3期31-39,共9页Journal of Electric Power Science And Technology

基　　金：福建省科技厅高校产学合作科技重大项目(2014H6028)

摘　　要：交直流混合有源配电系统的直流侧故障保护困难,现有的直流系统保护方法不能直接应用于交直流混合有源配电系统。分析交直流混合系统中配电网故障类型和各类故障的特点,针对混合配电网直流侧的故障特点,提出基于非单元保护的保护方案,并给出相应的保护判据与整定原则,该保护方案能在系统发生单极短路故障时,切除故障极,保证非故障极仍能单极运行;且能区分母线故障与馈线故障,有选择性地迅速检测和隔离故障,防止故障进一步延伸。PSCAD/EMTDC仿真分析表明:该保护方案能够快速地切除故障。There are many difficulties in the DC side protection of a distribution network in AC/DC hybrid system.The existing protection of DC system cannot be applied directly in the AC/DC hybrid power system.The fault characteristics of hybrid AC/DC system were analyzed,and a protection scheme based on non-unit protection was proposed in this paper.The corresponding protection criterion and setting principle were also presented.The protection scheme can clear the single-phase fault occurred in the power system,ensuring that the non-fault pole is still able to operate under monopole condition.The faults occurred at bus or feeder can be distinguished,and the faults can be selectively,quickly detected and isolated,preventing faults from being further extended.Finally,the PSCAD/EMTDC simulation results show that faults can be quickly cleared by the protection scheme.

关 键 词：交直流混合有源配电系统 配电网直流侧 故障分析 非单元保护 

分 类 号：TM72[电气工程—电力系统及自动化]