电力系统自动化Issue(23)：158-164,7.DOI:10.7500/AEPS20150325005
交直流互联系统对换流变压器差动保护的影响分析及对策
Effect of AC/DC Interconnected Network on Transformer Protection and Its Countermeasures
摘要
Abstract
Adverse impact on transformer protection performance will occur when commutation failure happens.First,the mechanism of transformer saturation caused by commutation failure is researched based on the addition switching function. Then,the effect of commutation failure on the transformer differential protection is studied in detail.The analysis result shows that the differential protection is seldom affected by commutation failure while there is only an external fault in the transformer,but it may cause trip failure during an internal fault.The existing traditional differential protection with second harmonic restraint cannot well adapt to the AC/DC interconnected network.In order to solve this problem,a synthetic restraining scheme with a new logic is proposed,which is capable of ensuring the reliability of differential protection during an internal fault, while the differential protection is blocked during an external fault by a novel restraining scheme. The correctness and effectiveness of the proposed scheme is verified by simulation results.关键词
交直流互联系统/换相失败/开关函数/差动保护/综合制动Key words
AC/DC interconnected network/commutation failure/switching function/differential protection/synthetic restraint引用本文复制引用
黄少锋,申洪明,刘玮,赵可..交直流互联系统对换流变压器差动保护的影响分析及对策[J].电力系统自动化,2015,(23):158-164,7.基金项目
国家重点基础研究发展计划(973计划)资助项目(2012CB215206) （973计划）
中央高校基本科研业务费专项资金资助项目(2015XS16) （2015XS16）
北京市国内外联合培养研究生共建项目资助。 （）
