Improved Droop Control Strategy for VSC-MTDC

WANG Yuhong; CHEN Yong; ZENG Qi; LI Jian; WANG Biao; YANG Liwen

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Improved Droop Control Strategy for VSC-MTDC

更新时间：2025-12-08

- Improved Droop Control Strategy for VSC-MTDC
- Vol. 44, Issue 10, Pages: 3190-3196(2018)
- 作者机构：
  
  1. 四川大学电气信息学院
  2. 国网四川省电力公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2018，
  
  Published：2018
- 稿件说明：
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WANG Yuhong, CHEN Yong, ZENG Qi, et al. Improved Droop Control Strategy for VSC-MTDC[J]. 2018, 44(10): 3190-3196.
DOI：

WANG Yuhong, CHEN Yong, ZENG Qi, et al. Improved Droop Control Strategy for VSC-MTDC[J]. 2018, 44(10): 3190-3196. DOI：

摘要

VSC-MTDC稳定运行的重要前提是直流电压的稳定

采用下垂控制的各换流器能够按照各自的功率曲线调整吸收的功率

共同参与直流电压的调节。首先分析了多端柔性直流输电系统下垂控制的运行特性

并提出一种改进的下垂控制方法

该控制方法通过监测本地直流电压来修正换流器的下垂系数

然后文章重点分析了改进控制方法的控制特性并提出换流器的协调控制策略。理论分析表明

系统发生小扰动时

采用本文改进控制的换流器能够减小直流电压偏差;在发生严重故障时

改进控制方法能够防止换流器过载运行。并且提出的控制方法可靠性高

能够简化控制器的参数设计

易于实际系统的实现。最后在PSCAD中搭建了四端VSC-MTDC进行了验证分析

仿真结果证明所提控制方法的有效性。

Abstract

The DC voltage stabilization is vital precondition of voltage sourced converter based multi-terminal high voltage direct current（VSC-MTDC） transmission systems. We analyzed the operation characteristics of droop control strategy used in VSC-MTDC

and proposed an improved method of control strategy. The improved control method works by measuring DC voltage to feedback to revise droop slope. This new control method is reliable and can simplify the design of controllers. Moreover

we analyzed the control characteristics of the new method and proposed a coordinate control strategy. Theory analysis indicates that when small variations occur

the new method can reduce DC voltage deviation;when serious large faults occur

the improved method can keep converter in operating in safe section. Finally

a typical 4-terminal VSC-MTDC transmission system in PSCAD is taken for example to verify the effectiveness of the proposed method.

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