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Harmonic voltage profile calculations of electric power transmission systems.

机译：电力传输系统的谐波电压曲线计算。

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摘要

Rapid developments in the semiconductor industry have made possible a revolutionary improvement in the power handling capabilities of the rectifying devices. This has led to increased number and size of solid state power conditioning equipment installed on power system networks. The direct consequence of this is the increase in the stationary harmonic frequency voltages and currents on power system networks causing distortion of the sinusoidal waveforms. The renewed interest in the harmonics and a need to study the impact of such harmonics is the basis for the work reported in this thesis.;Studies reported in this thesis are concerned with the harmonic voltage profile calculation of an electric power transmission network. The transmission lines due to their long lengths, tend to exhibit standing wave patterns comprising nodes and antinodes at harmonic frequencies. The studies are directed specifically towards the determination of the harmonic voltage profile of transmission lines. The effect of various parameters of the transmission system on the harmonic character of the transmission line voltage and current is studied. An iterative algorithm based on non-linear frequency domain analysis is presented in this thesis.;An important factor in this effort is the accurate modelling of various equipment of the power system including sources of harmonics. A dynamic model of a six pulse ac/dc converter is presented and the effect of the impedance of the converter transformer on the commutation delay is included to accurately determine the harmonic spectrum of the line current of the converter. The phase shifting behaviour of the transformer is preserved in the equivalent admittance matrix model of a transformer for the harmonic frequency analysis. The cascaded equivalent pi model of the transmission line is used in order to minimise the errors. Also, a cascaded pi model lends itself to obtaining the harmonic voltage profile. The skin effect, due to increased harmonic frequency, is also taken care of in modelling the transmission system. An iterative approach is proposed for the overall algorithm based upon the criterion of mismatch of active and non-active power.;Five example applications of the algorithm are presented ranging from a power system comprised long transmission lines to an industrial power system. The algorithm is general and can be used for any kind of balanced power system to study the harmonic bus voltages, harmonic line currents, harmonic voltage profiles of transmission lines etc. due to the harmonic loads, and resonance and filtering effects of VAR compensation. Other information available from the program is the distortion factor and bus impedance versus frequency table.;The approach taken is general and well suited for the analysis of balanced power system networks with ac/dc converters of various sizes.
机译：半导体行业的飞速发展使整流装置的功率处理能力有了革命性的改进。这导致安装在电力系统网络上的固态电力调节设备的数量和尺寸增加。其直接后果是电力系统网络上的固定谐波频率电压和电流增加，导致正弦波形失真。对谐波的重新关注以及对此类谐波的影响的研究需求是本文报道工作的基础。本论文报道的研究涉及输电网络的谐波电压分布计算。传输线由于其较长的长度而倾向于表现出包含谐波频率的波节和波腹的驻波图。这些研究专门针对确定传输线的谐波电压曲线。研究了输电系统各种参数对输电线路电压和电流谐波特性的影响。本文提出了一种基于非线性频域分析的迭代算法。该工作的一个重要因素是电力系统各种设备的精确建模，包括谐波源。提出了一个六脉冲交流/直流转换器的动态模型，并包括了转换器变压器阻抗对换向延迟的影响，以准确确定转换器线路电流的谐波频谱。变压器的相移行为保留在变压器的等效导纳矩阵模型中，用于谐波频率分析。为了减小误差，使用了传输线的级联等效pi模型。此外，级联的pi模型有助于获得谐波电压曲线。由于对谐波频率的增加，趋肤效应在传输系统建模中也得到了考虑。提出了一种基于有功和非有功功率不匹配准则的整体算法的迭代方法。提出了该算法的五个示例应用，范围从包括长输电线路的电力系统到工业电力系统。该算法是通用的，可用于任何类型的平衡电源系统，以研究由于谐波负载以及VAR补偿的谐振和滤波效应而引起的谐波母线电压，谐波线电流，传输线的谐波电压曲线等。该程序可提供的其他信息是失真因数和总线阻抗与频率表的关系。所采用的方法是通用的，非常适合于分析具有各种尺寸的AC / DC转换器的平衡电源系统网络。

著录项

  • 作者

    Sharma, Vinay K.;

  • 作者单位

    The University of Saskatchewan (Canada).;

  • 授予单位 The University of Saskatchewan (Canada).;
  • 学科 Engineering Electronics and Electrical.;Energy.
  • 学位 Ph.D.
  • 年度 1989
  • 页码 179 p.
  • 总页数 179
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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