参与电网调频的多端柔性直流输电系统自适应下垂控制策略

WANG Weiyu

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参与电网调频的多端柔性直流输电系统自适应下垂控制策略

更新时间：2025-08-13

- 参与电网调频的多端柔性直流输电系统自适应下垂控制策略
- Automation of Electric Power Systems Vol. 41, Issue 13, Pages: 142-149(2017)
- 作者机构：
  
  湖南大学电气与信息工程学院,湖南省,长沙市,410082
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- Published：2017
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WANG Weiyu. [J]. Automation of electric power systems, 2017, 41(13): 142-149.
DOI：

WANG Weiyu. [J]. Automation of electric power systems, 2017, 41(13): 142-149. DOI：

摘要

针对连接大型海上风电场的多端柔性直流(VSC-MTDC)输电系统，推导了传统直流电压下垂控制的功率分配机理，并分析了该控制策略对受端电网频率可能产生的不利影响。利用VSC-MTDC系统的直流电容储能，将受端电网频率和VSC-MTDC系统直流电压耦合，提出了可参与交流电网频率调整的自适应下垂控制方法。该方法根据交流系统的频率偏差，实时调整直流电压下垂系数，使各换流站在无需站间通信的前提下，快速调整各自的输出功率，保证交流系统频率稳定在合理范围内。最后，基于DIgSILENT/PowerFactory仿真软件搭建了五端VSC-MTDC系统，通过3个算例验证了所提方法的有效性。

Abstract

In view of the voltage source converter based multi-terminal direct current(VSC-MTDC)transmission system connected with large-scale offshore wind farms

the power distribution mechanism of the conventional DC voltage droop control is derived

and the impacts of the control strategy on the frequency of receiving grid are analyzed. The DC capacitor of the VSC-MTDC system is used for energy storage

and the frequency of receiving grid is coupled with the DC voltage of VSC-MTDC system. Then an adaptive droop control strategy participating in the primary frequency regulation is proposed. The strategy can adjust the DC voltage droop coefficient in real time according to the AC system frequency deviation

which makes each converter station rapidly adjust its own power output without communication. Thus the AC system frequency can be stabilized in a reasonable range. Finally

a five-terminal VSC-MTDC system is formed in the DigSILENT/PowerFactory simulation software

and the effectiveness of the proposed method is verified by results of three simulation examples.

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