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Research on the influence of HVDC transmission on measuring accuracy of current transformers

机译：高压直流输电对电流互感器测量精度影响的研究

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摘要

When high voltage direct current (HVDC) system is under the monopolar operation mode, huge direct current (DC) is injected into the earth through the DC grounding electrode, which will result in earth potential changes in a wide range of area . In this case, DC will be coupled into the nearby alternating current (AC) power grid and have some bad influences, called DC bias phenomenon, on the measuring accuracy of current transformers (CT) in this area . The two commonly used methods, formula derivation method and experimental test method, can only be used to assess quantitatively, but not give an insight into, aforementioned influence of DC bias phenomenon . Hence, for revealing the action mechanism of DC bias, a digital simulation model of CT is established based on Preisach theory and its correctness has been verified by error experiments . Then, the inherent mechanism of DC bias phenomenon is analyzed and concluded by the simulation of the coupling relationship of flux density of CT iron core, exciting current and DC bias . Most importantly, the first DC bias monitoring network for HVDC transmission project in China has been established, and then based on the real DC monitoring data and CT characteristic parameters, the influence status and tendency of the DC bias phenomenon on CT measuring accuracy are evaluated quantitatively .
机译：当高压直流（HVDC）系统处于单极运行模式时，巨大的直流电（DC）通过DC接地电极注入大地，这将导致大范围区域内的地电势变化。在这种情况下，直流电将耦合到附近的交流电（AC）电网中，并对该区域的电流互感器（CT）的测量精度产生一些不良影响，称为直流偏置现象。两种常用的方法，公式推导方法和实验测试方法，只能用于定量评估，而不能深入了解上述直流偏置现象的影响。因此，为揭示直流偏置的作用机理，基于Preisach理论建立了CT数字仿真模型，并通过误差实验验证了其正确性。然后，通过模拟CT铁心的磁通密度，励磁电流和直流偏置的耦合关系，分析和总结了直流偏置现象的内在机理。最重要的是，建立了国内第一个高压直流输电工程直流偏置监测网络，然后根据实际直流监测数据和CT特征参数，定量评估了直流偏置现象对CT测量精度的影响状况和趋势。 。

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