Charging Strategy Study of the Second Valve Group of UHV DC Converter Station and Experimental Verification of Prototype

TU Xiaogang; SONG Zhishun; CHANG Liguo; HONG Jun

doi:10.13296/j.1001-1609.hva.2021.11.013

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Charging Strategy Study of the Second Valve Group of UHV DC Converter Station and Experimental Verification of Prototype

更新时间：2025-04-26

- Charging Strategy Study of the Second Valve Group of UHV DC Converter Station and Experimental Verification of Prototype
- High VoltageApparatus Vol. 57, Issue 11, Pages: 101-107(2021)
- 作者机构：
  
  1. 西安西电电力系统有限公司
  2. 西安端怡科技有限公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2021.11.013
  CLC： TM721.1
- Published：2021
- 稿件说明：
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TU Xiaogang, SONG Zhishun, CHANG Liguo, et al. Charging Strategy Study of the Second Valve Group of UHV DC Converter Station and Experimental Verification of Prototype[J]. High voltageapparatus, 2021, 57(11): 101-107.
DOI：

TU Xiaogang, SONG Zhishun, CHANG Liguo, et al. Charging Strategy Study of the Second Valve Group of UHV DC Converter Station and Experimental Verification of Prototype[J]. High voltageapparatus, 2021, 57(11): 101-107. DOI： 10.13296/j.1001-1609.hva.2021.11.013.

摘要

800 kV特高压混合多端柔性直流输电工程的柔直换流站采用柔直阀组串联的形式

每个柔直阀组均由一定比例的基于MMC结构的半桥功率模块和全桥功率模块组成。MMC换流阀结构中包含电容器组

投入工作前必须先完成换流阀充电才能正常工作。在柔直换流站进行运行方式转换时

可能出现第二阀组投入的情况

此时第二阀组直流端口处于短路状态

不能使用传统的充电策略。文章分析了第二阀组投入时的充电问题

提出了一种用于柔直换流站第二阀组的充电策略

并在厂内±10 k V半桥/全桥混合型MMC样机上开展实验验证

结果显示该充电策略可以解决半桥/全桥混合型MMC换流阀串联的第二阀组投入时充电失败问题。

Abstract

The flexible DC valve group in series is adopted for the flexible DC converter station of ± 800 k V ultra high voltage multi-terminal flexible direct current transmission project（VSC-UHVDC）. Each flexible DC valve group consists of a certain proportion of half-bridge power module and full-bridge power module based on MMC structure.The structure of MMC converter valve contains capacitor bank which

before putting into operation

can not operate normally until the charging of the converter valve is completed. In case of operation mode transformation of the flexible DC converter station

such situation as operation of the second valve group may occur. At this time

the DC port of the second valve group is in the short circuit state and the traditional charging strategy cannot be used. In this paper

the charging issue in the operation of the second valve group is analyzed and a kind of charging strategy of the second valve group for the flexible DC converter station is proposed and the experimental verification on the ±10 kV/60 MW half-bridge & full-bridge hybrid modular multi-level converter valve prototype is performed. The result shows that the charging strategy can effectively solve the problem of charging failure in case of switching of the series second valve group of half-bridge and full-bridge hybrid MMC converter.

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