Impact factors on the 2nd zone of distance protection under integration of modular multilevel converters

2019 54th International Universities Power Engineering Conference (UPEC) Pub Date : 2019-09-01 DOI:10.1109/UPEC.2019.8893639

C. Brantl

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引用次数: 1

Abstract

The introduction of an increasing number of converters in the existing AC systems has led to a series of challenges. One of them is securing the stability of the existing AC grids in case of faults. Several publications indicate a negative impact of modular multilevel converters (MMC) on the AC distance protection, especially on its second zone. This work reviews the existing contributions and analyses the considered topologies and impact factors. Based on this analysis, study cases are derived to compare the impact of an MMC on the distance protection to other impact factors. Thereafter a differentiation between the factors resulting from the chosen system configuration and the impact of the MMC is given. The results show that there is an impact of the MMC on the second zone due to the given system topology. However, due to its limited fault current contribution capability, the impact does not exceed the variation due to other impact factors. Depending on the previously existing system conditions, the impact of an MMC inserted into an existing line is negligible in a meshed AC grid due to its limited short circuit current contribution.

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模块化多电平变流器集成下距离保护二区影响因素分析

在现有的交流系统中引入越来越多的变换器导致了一系列的挑战。其中之一是确保现有交流电网在发生故障时的稳定性。一些出版物表明，模块化多电平转换器(MMC)对交流距离保护的负面影响，特别是在其第二区。这项工作回顾了现有的贡献，并分析了考虑的拓扑结构和影响因素。在此基础上，导出了研究案例，将MMC对距离保护的影响与其他影响因素进行了比较。然后，给出了由所选择的系统配置和MMC的影响所产生的因素之间的区别。结果表明，由于给定的系统拓扑结构，MMC对第二区域有影响。但由于其故障电流贡献能力有限，其影响不超过其他影响因素引起的变化。根据先前存在的系统条件，插入到现有线路中的MMC的影响在网状交流电网中可以忽略不计，因为它的短路电流贡献有限。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 54th International Universities Power Engineering Conference (UPEC)

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