Concentrated DC Energy Braking Device with Discharge Controllable Sub-module Topology and Its Control

YAO Hongyang; XIE Yeyuan; FANG Taixun; JIANG Tiangui; DUAN Jun

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Concentrated DC Energy Braking Device with Discharge Controllable Sub-module Topology and Its Control

更新时间：2025-12-08

- Concentrated DC Energy Braking Device with Discharge Controllable Sub-module Topology and Its Control
- Vol. 47, Issue 8, Pages: 2896-2904(2021)
- 作者机构：
  
  南京南瑞继保电气有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2021，
  
  Published：2021
- 稿件说明：
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YAO Hongyang, XIE Yeyuan, FANG Taixun, et al. Concentrated DC Energy Braking Device with Discharge Controllable Sub-module Topology and Its Control[J]. 2021, 47(8): 2896-2904.
DOI：

YAO Hongyang, XIE Yeyuan, FANG Taixun, et al. Concentrated DC Energy Braking Device with Discharge Controllable Sub-module Topology and Its Control[J]. 2021, 47(8): 2896-2904. DOI：

摘要

柔性直流输电技术具有线路损耗低、可以独立控制有功与无功等技术优势

是离岸远海大规模海上风电实现并网的优选方式。采用柔性直流输电技术并网需要解决岸上交流侧发生故障时的穿越问题

目前常用的解决方案为配置直流耗能装置。在对比现有典型直流耗能装置拓扑的基础上

提出一种基于子模块可控放电拓扑的集中式直流耗能装置;采用分组阶梯投切策略降低直流耗能装置动作期间的直流电压尖峰

基于阶梯关断过程提出子模块电容精准可控放电策略

实现了故障穿越期间子模块电容电压的准确控制

电磁暂态仿真与RTDS实验结果表明所提出的直流耗能装置拓扑及控制策略能够支撑系统平稳实现故障穿越。

Abstract

The VSC-HVDC technology owns the advantages of low line loss and independent control of active and reactive power. It is the preferred way to realize grid connection of large-scale offshore wind farms. When the VSC-HVDC transmission technology is used for grid connection

the fault ride through（FRT） should be solved when onshore AC side fault occurs. At present

the common solution is to use DC energy breaking device（DBD）. Based on the comparison of the existing typical DBD topologies

a concentrated DBD based on discharge controllable sub-module topology is proposed in this paper. The range of DC voltage fluctuation is reduced by using the step switching on and off strategy

and the accurate controllable discharge strategy of the sub module capacitor is proposed based on the step switching off process. The experiment results of system simulation and Real Time Digital Simulation System（RTDS） show that the proposed DBD and control strategy can support the system to realize fault ride-through smoothly.

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Related Institution

直流系统工程装备研究中心(大连海事大学)

Electric Power Research Institute,China Southern Power Grid

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