Control and Protection of Multiple-terminal Flexible DC Distribution Network Based on MMC

LIU Huiqiang; LI Dandan; LIU Shichuan; MU Teng; XING Huadong; WU Haiyan; GUO Jianhua

doi:10.14044/j.1674-1757.pcrpc.2024.02.013

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Control and Protection of Multiple-terminal Flexible DC Distribution Network Based on MMC

Research on System Application | 更新时间：2024-09-14

- Control and Protection of Multiple-terminal Flexible DC Distribution Network Based on MMC
- Power Capacitor & Reactive Power Compensation Vol. 45, Issue 2, Pages: 84-90(2024)
- 作者机构：
  
  1.内蒙古电力科学研究院，呼和浩特　 010020
  2.内蒙古自治区电力系统智能化电网仿真企业重点实验室，呼和浩特　 010020
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2024.02.013
  CLC：
- Published：2024-04，
  
  Received：14 March 2023，
- 稿件说明：
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LIU HUIQIANG, LI DANDAN, LIU SHICHUAN, et al. Control and Protection of Multiple-terminal Flexible DC Distribution Network Based on MMC. [J]. Power capacitor & reactive power compensation, 2024, 45(2): 84-90.
DOI：

LIU HUIQIANG, LI DANDAN, LIU SHICHUAN, et al. Control and Protection of Multiple-terminal Flexible DC Distribution Network Based on MMC. [J]. Power capacitor & reactive power compensation, 2024, 45(2): 84-90. DOI： 10.14044/j.1674-1757.pcrpc.2024.02.013.

摘要

为提高多端柔直配电网系统的稳定运行能力，本文首先对分割的城市中压配电网进行互联设计了多端柔性直流混合配电网，对主要换流设备选型进行实例设计；基于下垂控制策略并结合功率参考值平移的曲线特性，将考虑电压限值的直流电压斜率控制方法应用于多端柔直配网，并制定本文设计案例的换流器保护配置策略。在PSCAD/EMTDC中完成10 kV多端柔直配网应用案例的搭建，最后仿真验证直流电压斜率控制策略及保护配置方案的有效性。

Abstract

For improving stable operation ability of multi terminal flexible direct distribution network system

the divided urban medium voltage distribution network is interconnected firstly in this paper

the multi terminal flexible DC hybrid distribution network is designed

and the selection of main converter equipment is designed; Based on the droop control strategy and combined with the curve characteristics of power reference value translation

the DC voltage slope control method considering voltage limit is applied to multi terminal flexible direct distribution network

and the converter protection configuration strategy of design case is formulated. The application case of 10 kV multi terminal flexible direct distribution network is set up in PSCAD/EMTDC. Finally

the effectiveness of DC voltage slope control strategy and protection configuration scheme is verified by simulation.

关键词

直流配电网MMC电压下垂控制保护配置

Keywords

DC distribution networkMMCvoltage droop controlprotection configuration

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