本文選題：電暈電流脈沖　切入點(diǎn)：時(shí)域特性　出處：《華北電力大學(xué)(北京)》2017年博士論文

【摘要】：高壓交流及直流輸電線路同走廊架設(shè)是一種節(jié)約土地資源、提高走廊輸電容量的有效方法。隨之而來的是新的電磁環(huán)境問題,其中很重要的一方面是由輸電線路電暈放電產(chǎn)生的無線電干擾問題。論文針對(duì)該新型輸電方式下的無線電干擾的源頭,即電暈電流脈沖,研究了鄰近交直流導(dǎo)線影響下的電暈電流脈沖時(shí)域特性。圍繞電暈電流脈沖時(shí)域特性,同時(shí)對(duì)電暈電流脈沖的測(cè)量方法、無線電干擾接收機(jī)的準(zhǔn)峰值響應(yīng)特性、電暈電流脈沖與地面離子流波形的關(guān)系等方面開展了相關(guān)的研究。本文的研究成果可以為交直流并行線路下的無線電干擾預(yù)測(cè)和分析提供有益的參考。首先,對(duì)比研究了兩種低電位下的電暈電流脈沖測(cè)量方法�；谑覂�(nèi)小型電暈籠,分別從試驗(yàn)導(dǎo)線側(cè)以及籠體側(cè)測(cè)量獲得了相應(yīng)的電暈電流脈沖波形。對(duì)兩種測(cè)量方式下的電暈電流脈沖波形進(jìn)行了對(duì)比,并獲得了匹配電阻對(duì)電暈電流脈沖波形的影響規(guī)律。針對(duì)兩種測(cè)量方法下的電暈電流脈沖傳播過程分別建立了電路模型和傳輸線模型,并驗(yàn)證了模型的有效性�；诮⒌哪Ｐ蛯�(duì)兩種測(cè)量方法進(jìn)行了系統(tǒng)的對(duì)比和分析,明確了兩種測(cè)量方法之間的關(guān)聯(lián)關(guān)系。其次,基于搭建的電暈籠實(shí)驗(yàn)平臺(tái),對(duì)交直流并行導(dǎo)線下的正負(fù)極性直流電暈電流脈沖以及交流電暈電流脈沖的時(shí)域特性進(jìn)行了系統(tǒng)地研究。分別對(duì)電暈電流脈沖的分布模式、波形參數(shù)、重復(fù)頻率、起始特性、二次脈沖的時(shí)間間隔、脈沖峰值的分布以及其它效應(yīng)進(jìn)行了分析,獲得了交直流并行導(dǎo)線下的電暈電流脈沖時(shí)域特性。同時(shí)基于電暈放電的離子云模型,分析和推導(dǎo)了鄰近的交流導(dǎo)線對(duì)負(fù)極性電暈電流脈沖時(shí)間間隔的調(diào)制效應(yīng)。最后,鑒于本文試驗(yàn)中觀測(cè)到的交直流導(dǎo)線并行時(shí)會(huì)明顯影響電暈電流脈沖分布模式與重復(fù)頻率的現(xiàn)象,建立了準(zhǔn)峰值檢波模式下的EMI接收機(jī)數(shù)值模型,分析了電暈電流脈沖分布模式、峰值、重復(fù)頻率等參數(shù)的變化對(duì)接收機(jī)準(zhǔn)峰值檢波結(jié)果的影響規(guī)律。與此同時(shí),為了建立電暈電流脈沖與地面離子流之間的關(guān)系,開展了線板電極下電暈電流脈沖與離子流時(shí)域波形的同步測(cè)量試驗(yàn),發(fā)現(xiàn)了電暈電流脈沖與地面離子流波形之間的關(guān)聯(lián)關(guān)系,并提出了一種基于電暈電流脈沖計(jì)算地面離子流的方法。
[Abstract]:The erection of HVAC and HVDC transmission lines with the same corridor is an effective method to save land resources and increase the transmission capacity of the corridor. One of the most important aspects is the radio interference caused by corona discharge of transmission lines. In this paper, the source of the radio interference under the new transmission mode, namely, the corona current pulse, is discussed. The time domain characteristics of corona current pulses under the influence of adjacent AC / DC conductors are studied. The time domain characteristics of corona current pulses, the measurement method of corona current pulses and the quasi-peak response characteristics of radio interference receivers are also studied. The relationship between corona current pulse and surface ion current waveform has been studied. The research results in this paper can provide a useful reference for the prediction and analysis of radio interference in AC / DC parallel lines. Two methods for measuring corona current pulse at low potential are compared. The corona current pulse waveforms are obtained from the test conductor side and the cage side respectively. The corona current pulse waveforms under the two measuring methods are compared. The effect of matching resistance on corona current pulse waveform is obtained. The circuit model and transmission line model are established for the two measurement methods. The validity of the model is verified. The comparison and analysis of the two measuring methods are carried out systematically based on the established model, and the relationship between the two measuring methods is clarified. Secondly, based on the corona cage experimental platform, the corona cage experimental platform is built. The time domain characteristics of positive and negative DC current pulse and AC corona current pulse are systematically studied. The distribution mode, waveform parameters, repetition rate and initial characteristics of corona current pulse are studied respectively. The time interval of the second pulse, the distribution of the pulse peak and other effects are analyzed, and the time domain characteristics of the corona current pulse under the AC / DC parallel conductor are obtained. At the same time, based on the ion cloud model of the corona discharge, the time domain characteristic of the corona current pulse is obtained. The modulation effect of adjacent AC conductors on the pulse interval of negative corona current is analyzed and deduced. Finally, In view of the phenomenon that the parallelism of AC / DC conductors observed in this paper will obviously affect the distribution mode and repetition rate of corona current pulses, a numerical model of EMI receiver in quasi-peak detection mode is established. The influence of the parameters of corona current pulse distribution mode, peak value and repetition rate on the quasi peak detection results of the receiver is analyzed. At the same time, in order to establish the relationship between the corona current pulse and the surface ion current, The synchronous measurement of corona current pulse and ion current waveform in time domain under wire plate electrode is carried out. The correlation between corona current pulse and surface ion current waveform is found. A method for calculating surface ion current based on corona current pulse is proposed.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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本文編號(hào)：1690539