• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2018, Vol. 39 ›› Issue (7): 57-63.doi: 10.3969/j.issn.1000-7229.2018.07.007

• 电力市场关键问题研究 栏目主持 陈启鑫副教授 • 上一篇    下一篇

无联结变压器MMC-MVDC配电网零序电压抑制策略

李钢, 田杰,卢宇,李海英,陆翌,邱德锋   

  1. 1. 南京南瑞继保电气有限公司, 南京市 211102;2. 国网浙江省电力有限公司电力科学研究院,杭州市 310014
  • 出版日期:2018-07-01
  • 作者简介:李钢 (1983),男,硕士,工程师,通信作者,主要研究方向为柔性直流输电、交直流配电网和直流电网; 田杰(1969),男,博士,教授级高级工程师,主要研究方向为特高压直流输电、柔性交流及直流输电、直流电网; 卢宇 (1979),男,高工,主要研究方向为特高压直流保护、柔性直流输电、交直流配电网和直流电网。
  • 基金资助:
    国家重点研发计划项目(2017YFB0903100);国家电网公司科技项目(521104170043)

Zero-sequence Voltage-suppressing control strategy for MMC-MVDC Without Coupling Transformer

LI Gang, TIAN Jie , LU Yu , LI Haiying , LU Yi , QIU Defeng   

  1. 1.NR Electric Co., Ltd., Nanjing 211102, China;2. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
  • Online:2018-07-01
  • Supported by:
    This work is supported by National Key Rsearch and Development Porgram of China (No. 2017YFB0903100) and State Grid Corporation of China Research Program(No. 521104170043).

摘要: 介绍了基于模块化多电平换流器(modular multilevel converter, MMC)的中压直流配电网采用无联结变压器接入的技术方案,针对单相故障零序电压导致直流波动和非故障站电压畸变,分析了单相接地故障零序电压产生及传导机理,并设计了相应的零序电压抑制控制器(zero sequence voltage suppressing controller, ZSVSC),抑制直流正负极电压中含有的零序电压,实现了非故障站交流电压对称稳定运行。在PSCAD/EMTDC仿真平台搭建了含ZSVSC的两端基于模块化多电平换流器的中压直流(modular multilevel converters medium voltage direct current ,MMC-MVDC)配电网仿真模型,仿真结果表明所设计控制器在不影响已有正负序控制策略的基础上,有效抑制了零序电压。

关键词: 中压配电网, 模块化多电平中压直流配电系统, 单相接地故障, 零序电压抑制控制器

Abstract: Technology scheme of AC distribution network connected by MMC-HVDC without coupling transformer is introduced. Single-phase fault will cause DC voltage fluctuation in local station and AC voltage distortion in non-faulty station. By analyzing the conduction mechanism of zero-sequence voltage when single-phase ground fault occurred, corresponding zero-sequence voltage-suppressing controller (ZSVSC) is designed. The designed ZSVSC can suppress the fluctuation of DC voltages on positive and negative poles, and realize the AC voltage at non-fault station symmetrical and stable. The MMC-MVDC simulation model with zero-sequence voltage-suppression controller is built on PSCAD / EMTDC simulation platform. Simulation results show the effectiveness of the designed ZSVSC.

Key words: medium voltage distribution network, MMC-MVDC distribution network, single-phase ground fault, zero-sequence voltage-suppressing controller.

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