A Novel Protective Scheme to Improve Half-Bridge MMC Operation against DC Fault Condition

2022 13th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC) Pub Date : 2022-02-01 DOI:10.1109/pedstc53976.2022.9767295

Araz Saleki, Saman Rezazade, Bahram Jahanbakhshi Pordanjani, Mahima Gupta, M. Bina

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引用次数: 2

Abstract

High-Voltage Direct-Current (HVDC) systems are an attractive solution for long distance power transmission. Among the various types of converters, Modular Multilevel Converter (MMC) has been identified as a modern converter choice for HVDC systems. Also, HVDC systems have been used widely and it is essential to conduct studies on the field of DC-side faults which are considered as big challenges in HVDC technology. Not only has it impacted the DC side converters, but also the AC system’s stability is entirely affected. In this paper, a novel protective scheme is proposed through which it can block the AC-feeding phenomenon during DC fault, by applying this protective scheme the AC grid will remain stable during non-permanent DC fault as well as prevent damage of electrical equipment. This paper presents the DC fault analysis and proposes a novel protective scheme to protect HVDC transmission lines against DC fault while maintaining AC side grid stability. Detailed simulation results verify the performance and effectiveness of the proposed method.

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一种改进半桥MMC直流故障运行的新型保护方案

高压直流(HVDC)系统是一种具有吸引力的长距离电力传输解决方案。在各种类型的变换器中，模块化多电平变换器(MMC)已被确定为高压直流系统的现代变换器选择。同时，高压直流系统的应用越来越广泛，对直流侧故障的研究是高压直流技术的一大挑战。它不仅对直流侧变换器产生影响，而且对交流系统的稳定性也产生全面影响。本文提出了一种新的保护方案，通过该保护方案可以在直流故障时阻断交流馈电现象，使交流电网在非永久性直流故障时保持稳定，防止电气设备损坏。本文对直流故障进行了分析，提出了一种新的保护方案，在保持交流侧电网稳定的同时保护直流输电线路免受直流故障的影响。详细的仿真结果验证了所提方法的性能和有效性。

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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2022 13th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

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