【摘要】：為提高高壓直流線路故障判別的可靠性,提出了一種高壓直流線路單端故障判別方法。通過分析直流濾波環(huán)節(jié)的阻抗特性,選取特征諧波電流,并分析其波形特征。直流線路區(qū)內(nèi)、外故障時,特征諧波電流的波動特性差異明顯,據(jù)此形成直流線路故障判據(jù)。利用方差值與均值之比,即波動系數(shù)來描述電流波形的波動大小。直流線路的故障判別僅需通過計算特征諧波電流的波動系數(shù)來實現(xiàn)。該故障判別方法原理簡單、可靠,不受系統(tǒng)參數(shù)及干擾的影響。對比分析顯示,該故障判別方法能有效克服傳統(tǒng)故障判別方法中僅利用單次暫態(tài)諧波幅值和頻帶暫態(tài)電氣量進(jìn)行故障識別的可靠性低和易受干擾的缺陷,并在采用較少判據(jù)的情況下,仍具有較高的可靠性。大量仿真結(jié)果表明,該故障判別方法能可靠、快速地區(qū)分直流線路區(qū)內(nèi)、外故障,且能實現(xiàn)故障選極。
[Abstract]:In order to improve the reliability of fault identification of HVDC transmission line, a single terminal fault discrimination method for HVDC line is proposed. By analyzing the impedance characteristics of DC filter, the characteristic harmonic current is selected and its waveform characteristics are analyzed. The fluctuation characteristics of the characteristic harmonic current are obviously different when the DC line is out of fault and the fault criterion of the DC line is formed based on the difference between the fluctuation characteristics of the characteristic harmonic current and the external fault. The ratio of variance to mean, that is, fluctuation coefficient, is used to describe the fluctuation of current waveform. The fault identification of DC line can only be realized by calculating the fluctuation coefficient of characteristic harmonic current. The method is simple, reliable and independent of system parameters and interference. The comparative analysis shows that this method can effectively overcome the shortcomings of the traditional fault discrimination method, which only uses the single transient harmonic amplitude and the frequency band transient electrical quantity to identify the fault, which is low reliability and vulnerable to interference. In the case of using fewer criteria, the reliability is still high. A large number of simulation results show that the fault discrimination method is reliable and can quickly distinguish the fault in the DC line area and the external fault, and the fault pole selection can be realized.
【作者單位】： 電力傳輸與功率變換控制教育部重點實驗室(上海交通大學(xué));
【基金】：國家自然科學(xué)基金(51377104,51407115) 中國博士后科學(xué)基金(2014M560333)資助項目
【分類號】：TM773

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