高压交直流并行导线下的电晕电流脉冲时域特性研究

发布时间：2018-03-31 11:28

本文选题：电晕电流脉冲　切入点：时域特性　出处：《华北电力大学(北京)》2017年博士论文

【摘要】：高压交流及直流输电线路同走廊架设是一种节约土地资源、提高走廊输电容量的有效方法。随之而来的是新的电磁环境问题,其中很重要的一方面是由输电线路电晕放电产生的无线电干扰问题。论文针对该新型输电方式下的无线电干扰的源头,即电晕电流脉冲,研究了邻近交直流导线影响下的电晕电流脉冲时域特性。围绕电晕电流脉冲时域特性,同时对电晕电流脉冲的测量方法、无线电干扰接收机的准峰值响应特性、电晕电流脉冲与地面离子流波形的关系等方面开展了相关的研究。本文的研究成果可以为交直流并行线路下的无线电干扰预测和分析提供有益的参考。首先,对比研究了两种低电位下的电晕电流脉冲测量方法。基于室内小型电晕笼,分别从试验导线侧以及笼体侧测量获得了相应的电晕电流脉冲波形。对两种测量方式下的电晕电流脉冲波形进行了对比,并获得了匹配电阻对电晕电流脉冲波形的影响规律。针对两种测量方法下的电晕电流脉冲传播过程分别建立了电路模型和传输线模型,并验证了模型的有效性。基于建立的模型对两种测量方法进行了系统的对比和分析,明确了两种测量方法之间的关联关系。其次,基于搭建的电晕笼实验平台,对交直流并行导线下的正负极性直流电晕电流脉冲以及交流电晕电流脉冲的时域特性进行了系统地研究。分别对电晕电流脉冲的分布模式、波形参数、重复频率、起始特性、二次脉冲的时间间隔、脉冲峰值的分布以及其它效应进行了分析,获得了交直流并行导线下的电晕电流脉冲时域特性。同时基于电晕放电的离子云模型,分析和推导了邻近的交流导线对负极性电晕电流脉冲时间间隔的调制效应。最后,鉴于本文试验中观测到的交直流导线并行时会明显影响电晕电流脉冲分布模式与重复频率的现象,建立了准峰值检波模式下的EMI接收机数值模型,分析了电晕电流脉冲分布模式、峰值、重复频率等参数的变化对接收机准峰值检波结果的影响规律。与此同时,为了建立电晕电流脉冲与地面离子流之间的关系,开展了线板电极下电晕电流脉冲与离子流时域波形的同步测量试验,发现了电晕电流脉冲与地面离子流波形之间的关联关系,并提出了一种基于电晕电流脉冲计算地面离子流的方法。
[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.
【学位授予单位】：华北电力大学(北京)
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TM75

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