针对目前直流输电线路行波保护耐受过渡电阻能力差的问题,在系统地分析±800 k V直流线路不同故障暂态特性的基础上,提出了一种利用电压比自适应调整保护定值的极线行波保护新原理及其定值整定原则。采用应用于±800 k V云广直...针对目前直流输电线路行波保护耐受过渡电阻能力差的问题,在系统地分析±800 k V直流线路不同故障暂态特性的基础上,提出了一种利用电压比自适应调整保护定值的极线行波保护新原理及其定值整定原则。采用应用于±800 k V云广直流实际工程运维分析的PSCAD/EMTDC详细仿真模型对保护新原理进行验证,结果表明所提保护原理能有效地提高目前行波保护耐受过渡电阻能力和抗干扰能力,且可在现有行波保护软硬件平台上实现,工程实用性强。展开更多
The fast and accurate detection of the single-phaseto-ground fault is of great significance for the reliability and safety of the power supply.In this paper,novel algorithms for distribution network protection were pr...The fast and accurate detection of the single-phaseto-ground fault is of great significance for the reliability and safety of the power supply.In this paper,novel algorithms for distribution network protection were proposed with distributed parameters analysis in non-direct grounded systems.At first,novel generating mechanisms of zero-sequence voltage and residual current were proposed.Then the compositions of residue parameters,including residual current and residual admittances,were decomposed in detail.After that,an improved algorithm for a fault resistance calculation of a single phase-to-earth fault was also proposed,and the algorithm is much more convenient as it only needs to measure the variation of the zero-sequence voltage and does not need the prerequisites of the faulty feeder selection.Furthermore,the fault feeder can also be selected by an improved calculation algorithm of zero-sequence admittance of the faulty feeder,which cannot be affected by the asymmetry of the network.Theoretical analysis and the MATALB/Simulink simulation results demonstrate the effectiveness of the proposed algorithms.展开更多
文摘针对目前直流输电线路行波保护耐受过渡电阻能力差的问题,在系统地分析±800 k V直流线路不同故障暂态特性的基础上,提出了一种利用电压比自适应调整保护定值的极线行波保护新原理及其定值整定原则。采用应用于±800 k V云广直流实际工程运维分析的PSCAD/EMTDC详细仿真模型对保护新原理进行验证,结果表明所提保护原理能有效地提高目前行波保护耐受过渡电阻能力和抗干扰能力,且可在现有行波保护软硬件平台上实现,工程实用性强。
基金This work was supported in part by the National Natural Science Foundation of China(No.51177039)in part by the Fundamental Research Funds for the Central Universities(2018B06314)the 111 Intelligence project(B14022).
文摘The fast and accurate detection of the single-phaseto-ground fault is of great significance for the reliability and safety of the power supply.In this paper,novel algorithms for distribution network protection were proposed with distributed parameters analysis in non-direct grounded systems.At first,novel generating mechanisms of zero-sequence voltage and residual current were proposed.Then the compositions of residue parameters,including residual current and residual admittances,were decomposed in detail.After that,an improved algorithm for a fault resistance calculation of a single phase-to-earth fault was also proposed,and the algorithm is much more convenient as it only needs to measure the variation of the zero-sequence voltage and does not need the prerequisites of the faulty feeder selection.Furthermore,the fault feeder can also be selected by an improved calculation algorithm of zero-sequence admittance of the faulty feeder,which cannot be affected by the asymmetry of the network.Theoretical analysis and the MATALB/Simulink simulation results demonstrate the effectiveness of the proposed algorithms.
