YANG Zihe,LI Yongli,SONG Jinzhao,et al.Fault characteristics analysis and fault component current differential protection improvement of AC system with infeed DC[J].Electric Power Automation Equipment,2019,39(09):3-10.
YANG Zihe,LI Yongli,SONG Jinzhao,et al.Fault characteristics analysis and fault component current differential protection improvement of AC system with infeed DC[J].Electric Power Automation Equipment,2019,39(09):3-10.DOI: 10.16081/j.epae.201909018.
Fault characteristics analysis and fault component current differential protection improvement of AC system with infeed DC
Because of the fast and nonlinear characteristics of fault response in DC system,the analysis method based on quasi-steady is no more suitable for HVDC/AC(High Voltage DC/AC interconnected) system,which makes the analysis of AC protection adaptability more difficult. In order to solve this pro-blem,based on the original dynamic phasor equivalence method of HVDC/AC system,the effect of nonli-near of DC system and control strategy switching of DC system under faults with different severities is considered,and a more accurate equivalent calculation method of HVDC/AC system is proposed. On this basis,the effect of interconnection of DC system on transient fault characteristics of AC line is analyzed,the relation between which and the operation performance of fault component current differential protection is researched,and a self-adaptive operation criterion of the protection based on current sag detection is proposed. The simulative results based on PSCAD/EMTDC platform verify the correctness of theoretical analysis and the effectiveness of the improved strategy.
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