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Frequency domain based DC fault analysis for bipolar HVDC grids

机译:双极HVDC电网基于频域的DC故障分析

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摘要

This paper proposes a frequency domain based methodology to analyse the influence of High Voltage Direct Current (HVDC) configurations and system parameters on the travelling wave behaviour during a DC fault. The method allows us to gain deeper understanding of these influencing parameters. In the literature, the majority of DC protection algorithms essentially use the first travelling waves initiated by a DC fault for fault discrimination due to the stringent time constraint in DC grid protection. However, most protection algorithms up to now have been designed based on extensive time domain simulations using one specific test system. Therefore, general applicability or adaptability to different configurations and system changes is not by default ensured, and it is difficult to gain in-depth understanding of the influencing parameters through time domain simulations. In order to analyse the first travelling wave for meshed HVDC grids, voltage and current wave transfer functions with respect to the incident voltage wave are derived adopting Laplace domain based component models. The step responses obtained from the voltage transfer functions are validated by comparison against simulations using a detailed model implemented in PSCAD™. Then, the influences of system parameters such as the number of parallel branches, HVDC grid configurations and groundings on the first travelling wave are investigated by analysing the voltage and current transfer functions.
机译:本文提出了一种基于频域的方法,以分析高压直流(HVDC)配置和系统参数对直流故障期间行波行为的影响。该方法使我们能够更深入地了解这些影响参数。在文献中,由于直流电网保护中的严格时间限制,大多数直流保护算法实际上都将由直流故障引发的第一行波用于故障判别。但是,到目前为止,大多数保护算法都是基于使用一个特定测试系统进行的广泛时域仿真而设计的。因此,默认情况下无法确保对不同配置和系统更改的一般适用性或适应性,并且很难通过时域仿真深入了解影响参数。为了分析网状HVDC电网的第一行波,采用基于Laplace域的组件模型推导了相对于入射电压波的电压和电流波传递函数。通过使用PSCAD™中实现的详细模型与仿真进行比较,可以验证从电压传递函数获得的阶跃响应。然后,通过分析电压和电流传递函数,研究了系统参数(如并联支路数,HVDC电网配置和接地)对第一行波的影响。

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