HOU Junjie,SONG Guobing,CHANG Zhongxue,et al.DC line fault protection principle based on polarity characteristics of differential current of fault components for whole process of failure[J].Electric Power Automation Equipment,2019,39(09):11-19.
HOU Junjie,SONG Guobing,CHANG Zhongxue,et al.DC line fault protection principle based on polarity characteristics of differential current of fault components for whole process of failure[J].Electric Power Automation Equipment,2019,39(09):11-19.DOI: 10.16081/j.epae.201909046.
DC line fault protection principle based on polarity characteristics of differential current of fault components for whole process of failure
In order to improve the reliability of DC line protection,it is necessary to study the principle of back-up protection that can distinguish faults in both steady and transient state processes. A differential protection principle based on polarity characteristics of differential current of fault components is proposed for the whole process of failure. By analyzing the characteristics of the current fault components in transient stage,i.e. the non-response stage and the dynamic regulation stage of converter,and the steady-state stage of faults,it is found that in the whole process of failure,the difference of the fault components between rectifier and inverter side satisfies the positive polarity characteristics in internal fault while not sa-tisfies the positive polarity characteristics in external fault. The differential protection criteria for the whole process of failure are established. Simulative results show that the criteria can operate correctly under various working conditions,and is less affected by the harmonics of fault characteristics of AC system with strong anti-transition-resistance ability and anti-interference ability.
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