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首页> 外文期刊>Electric power systems research >Measurement-based frequency-dependent model of a HVDC transformer for electromagnetic transient studies
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Measurement-based frequency-dependent model of a HVDC transformer for electromagnetic transient studies

机译：用于电磁暂态研究的HVDC变压器基于测量的频率相关模型

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摘要

A wide-band, frequency-dependent five-terminal model is developed that represents one HVDC transformer unit in the French-English IFA2000 HVDC interconnection. Three such interconnected 1-ph units constitute one 3-ph transformer bank needed in 12-pulse conversion. The model is obtained via admittance frequency sweep measurements on the transformer's terminals, including common-mode measurements to capture the high-impedance coupling to earth at lower frequencies. The data set is modified to reduce the magnetizing current to a realistic level by a novel eigenvalue scaling procedure. The final data set is subjected to modeling by a stable and passive rational model while utilizing a mode-revealing transformation to retain the accuracy of the small eigenvalues that are related to the high-impedance coupling to earth. The paper describes details related to the measurements and modeling steps as well as the many intermediate accuracy validations that were done. Also is described challenges in the measurements that resulted due to interference of the measurements by a nearby 400 kV overhead line. The model is applied in a time domain simulation of the complete HVDC link in normal operation where voltage waveforms resulting from line commutations are compared against those by a classical model with added stray capacitances.
机译：开发了一种宽带，与频率相关的五端子模型，该模型表示法英IFA2000 HVDC互连中的一个HVDC变压器单元。三个此类互连的1-ph单元构成了12脉冲转换所需的一个3-ph变压器组。该模型是通过变压器端子上的导纳扫频测量获得的，包括共模测量，以捕获低频下与地面的高阻抗耦合。通过新颖的特征值缩放程序修改了数据集以将励磁电流降低到现实水平。最终数据集通过稳定和被动的有理模型进行建模，同时利用模式揭示转换来保留与接地高阻抗相关的小特征值的精度。本文介绍了与测量和建模步骤以及已完成的许多中间精度验证有关的详细信息。还描述了由于附近400 kV架空线对测量的干扰而导致的测量挑战。该模型适用于正常运行中完整HVDC链路的时域仿真，其中将线路换向产生的电压波形与带有附加杂散电容的经典模型进行比较。

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