MMC-HVDC输电网用高压DC/DC变换器隔离需求探讨

WANG Xinying

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MMC-HVDC输电网用高压DC/DC变换器隔离需求探讨

更新时间：2025-08-13

- MMC-HVDC输电网用高压DC/DC变换器隔离需求探讨
- Automation of Electric Power Systems Vol. 41, Issue 8, Pages: 172-178(2017)
- 作者机构：
  
  新能源电力系统国家重点实验室(华北电力大学),北京市,102206
- 作者简介：
- 基金信息：
- DOI：
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- Published：2017
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WANG Xinying. [J]. Automation of electric power systems, 2017, 41(8): 172-178.
DOI：

WANG Xinying. [J]. Automation of electric power systems, 2017, 41(8): 172-178. DOI：

摘要

高压DC/DC变换器是构建直流电网的关键装备之一

其技术需求分析是其电气拓扑设计和系统应用研究的前提。文中着重围绕基于模块化多电平换流器的高压直流(MMC-HVDC)输电网用高压DC/DC变换器电气隔离功能的选择和故障隔离要求等问题展开探讨。从DC/DC变换器故障特性、系统绝缘造价和可靠性角度分析了不同接地方式的直流系统中DC/DC变换器的电气隔离需求

分析结果表明:对称单极系统中DC/DC变换器宜具备电气隔离功能

而双极系统宜采用非电气隔离拓扑。此外

从DC/DC变换器外部故障和内部故障两个角度对DC/DC变换器的故障隔离需求进行了研究。最后

通过仿真验证了隔离需求分析的正确性。

Abstract

The DC/DC converter is one of the key devices of DC grid. The technological requirement analysis of the DC/DC converter is the premise of its topology design and application research. The selection of electrical isolation function and the requirement of fault blocking of DC/DC converters for modular multilevel converter based high-voltage direct current(MMC-HVDC)transmission systems are discussed. The electrical isolation requirements of DC/DC converter under different grounding systems are analyzed in terms of fault characteristics

insulation cost and system reliability. The analysis results show that electrical isolation is needed under symmetric monopole system and non-electrical isolation is better for bipolar system. Besides

DC/DC converter fault blocking demand is carefully investigated in terms of extermal and internal faults of the DC/DC converter. Finally

the analysis of electrical isolation and fault blocking demand of the DC/DC converter are verified through simulations.

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新型混合式高压直流输电DC/DC变换器

可隔离直流故障的直流电网用DC/DC变换器拓扑

面对面式DC/DC互联LCC-HVDC的潮流控制

Fast Protection Scheme for Bipolar Face-to-face Modular Multilevel Converter Based DC Transformer

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