| 引用本文: | 徐岩,刘泽锴,应璐曼.混合MIDC馈入下的工频变化量阻抗方向保护
动作特性分析[J].电力系统保护与控制,2015,43(5):14-20. |
| XU Yan,LIU Zekai,YIN Luman.Performance of impedance directional protection based on variation of power-frequency components in hybrid multi-infeed HVDC system[J].Power System Protection and Control,2015,43(5):14-20 |
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| 摘要: |
| 交流电网故障引发线路换相换流器高压直流(Line Commutated Converter High Voltage Direct Current, LCC-HVDC)换相失败，改变了原有交流电网工频变化量方向保护动作特性。针对这一问题，建立了由电压源换流器高压直流(Voltage Source Converter HVDC, VSC-HVDC)系统与LCC-HVDC系统组成的混合多馈入直流(bybrid multi-infeed HVDC，HMIDC)输电系统模型，并与馈入同一交流电网的单条LCC-HV |
| 关键词: 线路换相换流器高压直流 电压源换流器高压直流 混合多馈入直流 工频变化量 方向纵联保护 换相失败 |
| DOI：10.7667/j.issn.1674-3415.2015.05.003 |
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| 基金项目: |
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| Performance of impedance directional protection based on variation of power-frequency components in hybrid multi-infeed HVDC system |
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XU Yan, LIU Zekai, YIN Luman
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China
Electric Power University), Baoding 071003, China
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| Abstract: |
| The LCC-HVDC commutation failure caused by AC power network fault affects the operation of directional protection based on power-frequency component variation for AC transmission lines. A hybrid multi-infeed HVDC system model consisted of a VSC-HVDC system and a LCC-HVDC system is set up, compared with a AC/DC system of a single LCC-HVDC system fed into the same AC grid. Combined with the characteristic of the analysis of power-frequency component variation based on the principle of directional protection, the performance of LCC-HVDC equivalent impedance of power-frequency component variation is quantitatively analyzed under the same commutation failure in LCC-HVDC system of this two different transmission structures. The simulations of two different structures for the same commutation failure of HVDC in identical fault simulated by PSCAD/EMTDC testify the accuracy and validity of the theory analysis. It indicates that the hybrid multi-infeed HVDC system can improve the impact of directional protection based on power-frequency component variation caused by the LCC-HVDC commutation failure and provides the theoretical basis for the power network planning. |
| Key words: line commutated converter high voltage direct current voltage source converter HVDC hybrid multi-infeed HVDC power-frequency component variation directional pilot protection commutation failure |
