Novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer
Protection Technology in AC/DC Hybrid Power Grid|更新时间:2026-06-30
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Novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer
Electric Power Automation EquipmentVol. 39, Issue 9, Pages: 20-26(2019)
WENG Hanli,LI Haowei,XING Jiawei,et al.Novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer[J].Electric Power Automation Equipment,2019,39(09):20-26.
WENG Hanli,LI Haowei,XING Jiawei,et al.Novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer[J].Electric Power Automation Equipment,2019,39(09):20-26.DOI: 10.16081/j.epae.201909048.
Novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer
In order to deal with the mal-operations of zero-sequence differential protection of converter transformer,a novel criterion adopting S-transform phase angle difference and energy relative entropy for zero-sequence differential protection of converter transformer is proposed. By analyzing the characteristics of the zero-sequence currents under different conditions of converter transformer including various internal faults,external faults and external fault removal,the differences of phase and energy probability distribution between the self-produced zero-sequence currents on both sides of zero-sequence differential protection and those on neutral line are identified. The waveforms of zero-sequence currents on two sides of zero-sequence differential protection are very similar during the external faults,both the phase difference and the energy relative entropy of which are close to zero. However,during internal faults,the zero-sequence currents on two sides of zero-sequence differential protection have opposite phases and low waveform similarity,and the phase difference is approximately 180° and the energy relative entropy is increased. The results of simulation tests indicate that immune to the fault types and transition resistances,the proposed criterion can accurately and rapidly discriminate internal and external faults with the ability of anti-saturation of current transformers.
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