本文選題：高壓直流 + 暫態(tài)測量阻抗　； 參考：《中國電機(jī)工程學(xué)報》2016年20期

【摘要】：為提高高壓直流線路故障檢測的準(zhǔn)確性,提出一種利用直流線路兩端暫態(tài)測量阻抗特征的故障判別方法�；陂L線路傳輸方程,分析直流區(qū)內(nèi)、外故障暫態(tài)過程中線路兩端的暫態(tài)測量阻抗特征(定義為暫態(tài)電壓分量與暫態(tài)電流分量之比)。由于直流線路與邊界在不同頻帶下呈現(xiàn)的阻抗特征存在差異,區(qū)內(nèi)、外故障時,線路兩端暫態(tài)測量阻抗將不同,據(jù)此可形成故障判據(jù)。利用暫態(tài)測量阻抗進(jìn)行故障判別,克服傳統(tǒng)暫態(tài)諧波保護(hù)中諧波幅值低、易受線路衰減及過渡電阻的影響等缺陷。結(jié)合雙極線路低頻段暫態(tài)分量耦合系數(shù)小的特點(diǎn),提出利用低頻段暫態(tài)電流比值進(jìn)行故障極判別。仿真分析與現(xiàn)場錄波數(shù)據(jù)測試表明,該方法能準(zhǔn)確、可靠地實(shí)現(xiàn)直流線路的故障判別,具有較強(qiáng)的抗過渡電阻能力,且對于系統(tǒng)參數(shù)的變化具有一定的適應(yīng)性。
[Abstract]:In order to improve the accuracy of fault detection of HVDC transmission line, a fault discrimination method using transient impedance characteristics of both ends of DC line is proposed. Based on the transmission equation of long transmission line, the impedance characteristics of transient measurement at both ends of the line during the transient process of external fault in DC region are analyzed (defined as the ratio of transient voltage component to transient current component). Because the impedance characteristics of DC line and boundary are different in different frequency bands, the transient measurement impedance at both ends of the line will be different when the fault occurs in the region or outside, so the fault criterion can be formed. In order to overcome the defects such as low harmonic amplitude easy to be affected by line attenuation and transient resistance in traditional transient harmonic protection the fault identification is carried out by using transient measurement impedance. Combined with the small coupling coefficient of transient components in the low frequency band of bipolar line, the fault pole discrimination is proposed by using the transient current ratio in the low frequency band. Simulation analysis and field wave recording data test show that the method can accurately and reliably distinguish the fault of DC line, has strong resistance to transition resistance, and has certain adaptability to the change of system parameters.
【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)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(xiàng)目(51377104,51407115) 中國博士后科學(xué)基金(2014M560333)~~
【分類號】：TM755

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本文編號：1879048