摘要
研究了基于直流电压变化率的直流电网直流故障监测与隔离。介绍了量测直流电压变化率的原理,分析了直流限流电感、直流故障位置、直流故障类型、故障电阻值及量测时间常数对直流电压变化率的影响。在PSCAD/EMTDC下搭建了四端口环形直流电网,选择了各直流断路器的整定值,当电压变化率超过整定值时判定发生区内直流故障,给直流断路器开断信号,从而触发断路器动作来清除直流故障。通过对极对地、极对极故障的仿真,验证了所研究方法的可行性。
DC fault detection and DC fault isolation based on change rate of DC voltage in DC grid are studied. The principle of change rate of DC voltage is introduced. The influence factors on change rate of DC voltage are analyzed, including current limited re- actor, fault location, fault type, fault resistance and measurement time constant. A four-terminal MMC-MTDC is established in PSCAD/EMTDC and setting values of direct current circuit breakers（ DC CBs） are chosen. When change rate of DC voltage exceeds setting values, internal DC faults are judged and DC CBs receive the tripping singal to isolate the DC faults. The feasibility of the pro- posed protection method is proved by simulating pole-to-ground DC fault and pole-to-pole DC fault.
出处
《南方电网技术》
北大核心
2017年第1期14-22,共9页
Southern Power System Technology
基金
国家重点研发计划(2016YFB0901002)
中国博士后科学基金资助项目(2015M580643)~~
关键词
直流断路器
电压变化率
直流电网
故障保护
direct current circuit breaker （DC CB）
change rate of voltage
DC grid
fault protection
