【摘要】：根據(jù)高壓直流輸電線路兩端直流濾波器和換流器的阻抗頻率特性,提出一種基于直流濾波器峰值頻率的縱聯(lián)保護方案。峰值頻率下,直流濾波器近似為開路,換流器直流等值阻抗近似表現(xiàn)為感性元件。以此為基礎(chǔ),對直流輸電線路進行區(qū)內(nèi)外故障分析發(fā)現(xiàn),區(qū)內(nèi)故障時,整流側(cè)、逆變側(cè)峰值頻點阻抗阻抗角均為-90°;區(qū)外故障時,故障側(cè)峰值頻點阻抗阻抗角為90°,對側(cè)峰值頻點阻抗阻抗角仍為-90°。根據(jù)此特征構(gòu)造出區(qū)內(nèi)外故障識別判據(jù)。針對利用單端故障信號選極可靠性差的弱點,進一步提出了含權(quán)重系數(shù)的雙端選極判據(jù)。仿真結(jié)果表明,該方案原理簡單、方法可靠、抗過渡電阻能力強且不受分布電容電流的影響。
[Abstract]:According to the impedance frequency characteristics of DC filters and converters at both ends of HVDC transmission lines, a longitudinal protection scheme based on the peak frequency of DC filters is proposed. At the peak frequency, the DC filter is approximately open circuit, and the DC equivalent impedance of the converter is approximately the inductive element. On the basis of this, the fault analysis inside and outside the area of HVDC transmission line shows that the peak impedance angle of rectifier side and inverter side is -90 擄when the fault is in the region, and when the fault is outside the area, the impedance angle of peak frequency point of rectifier side and inverter side is -90 擄. The impedance angle of the peak frequency point of fault side is 90 擄, and the impedance angle of the opposite peak frequency point is still -90 擄. According to this feature, a fault identification criterion within and outside the region is constructed. Aiming at the weakness of poor reliability of single terminal fault signal selection, the criterion of double terminal pole selection with weight coefficient is proposed. The simulation results show that the scheme is simple in principle, reliable in method, strong in resistance to transition resistance and independent of distributed capacitance current.
【作者單位】： 上海交通大學(xué)電子信息與電氣工程學(xué)院;國網(wǎng)上海市電力公司電力科學(xué)研究院;國網(wǎng)福建省電力有限公司電力科學(xué)研究院;
【基金】：國家自然科學(xué)基金項目(51377104,51407115) 中國博士后科學(xué)基金資助項目(2014M560333)~~
【分類號】：TM75;TM773

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本文編號：2275183