Simulation Research on Grounding Mode of Modular Multilevel Converter Based Medium Voltage DC Distribution System

2021 3rd Asia Energy and Electrical Engineering Symposium (AEEES) Pub Date : 2021-03-26 DOI:10.1109/AEEES51875.2021.9403197

Nali Fan, Bing Shen, Jing Huang, Jiandong Chen

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引用次数: 1

Abstract

The grounding mode of the medium voltage direct current distribution system based on the modular multi-level converter is very important for the reliability of power supply system, overvoltage and insulation coordination, relay protection, communication interference, and system stability and so on. Firstly, from the main characteristics of the medium voltage direct current distribution system based on the modular multi-level converter, the types of grounding modes and the types of fault are summarized. Secondly, the single-phase ground fault in alternating current side and the pole-to-ground fault in direct current side under the different grounding modes were Compared, and a simulation model of medium voltage direct current distribution system in power system computer aided design and electric magnetic transient in DC system is established for analysis. Finally, according to the difference of the access system schemes of the medium voltage direct current distribution system, a recommended grounding scheme is proposed.

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基于模块化多电平变换器的中压直流配电系统接地方式仿真研究

基于模块化多级变换器的中压直流配电系统的接地方式对供电系统的可靠性、过压与绝缘协调、继电保护、通信干扰、系统稳定性等具有重要意义。首先，从基于模块化多级变换器的中压直流配电系统的主要特点出发，总结了其接地方式类型和故障类型;其次，比较了不同接地方式下交流侧单相接地故障和直流侧极地故障，建立了电力系统计算机辅助设计中压直流配电系统和直流系统电磁暂态仿真模型进行分析。最后，根据中压直流配电系统接入系统方案的不同，提出了推荐的接地方案。

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2021 3rd Asia Energy and Electrical Engineering Symposium (AEEES)

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