Operation Characteristics of VSC-HVDC Links Connected to Weak AC Systems Based on Critical SCR

WANG Yinshun; LI Xiaoxiao; ZHANG Xin

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Operation Characteristics of VSC-HVDC Links Connected to Weak AC Systems Based on Critical SCR

更新时间：2025-12-08

- Operation Characteristics of VSC-HVDC Links Connected to Weak AC Systems Based on Critical SCR
- Vol. 43, Issue 4, Pages: 1106-1113(2017)
- 作者机构：
  
  1. 华北电力大学电气与电子工程学院
  2. 中国电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 April 2017，
  
  Published：2017
- 稿件说明：
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WANG Yinshun, LI Xiaoxiao, ZHANG Xin. Operation Characteristics of VSC-HVDC Links Connected to Weak AC Systems Based on Critical SCR[J]. 2017, 43(4): 1106-1113.
DOI：

WANG Yinshun, LI Xiaoxiao, ZHANG Xin. Operation Characteristics of VSC-HVDC Links Connected to Weak AC Systems Based on Critical SCR[J]. 2017, 43(4): 1106-1113. DOI：

摘要

基于电压源换流器的高压直流输电技术(VSC-HVDC)具备不依靠受端系统提供换相电流的特点

具有向弱交流系统供电的能力

但接入弱交流系统后的运行特性还有待研究。建立了弱交流系统和VSC-HVDC的数学模型

从最大输送功率的角度分析了制约VSC-HVDC接入弱交流系统的因素

并通过交流侧潮流方程和受端系统的安全稳定条件

得出VSC-HVDC在弱交流系统中接入的理论临界短路比。在BPA软件中进行仿真验证

结果表明

当VSC-HVDC接入弱交流系统的短路比<1.4时

应采取文中提出的措施以保证系统稳定运行。仿真结果和理论分析相一致

为VSC-HVDC工程应用提供了理论指导。

Abstract

High-voltage direct current transmission based on voltage-source converter（VSC-HVDC） transmission doesn’t rely on receiving end to provide commutating current. VSC-HVDC links can access in weak alternative current（AC） systems. However

operation characteristics that VSC-HVDC links access to weak AC systems need to be studied. Consequently

we established mathematical models of actual weak power systems and VSC-HVDC links. From view of max transmission power

we analyzed influence factors that restrict VSC-HVDC links to access in weak AC systems. Combined with power flow equations in AC side and stable operation condition

theoretical critical SCR that VSC-HVDC transmission accesses to weak AC power network was obtained. Moreover

theoretical analysis was verified in BPA software.The simulation results demonstrate that the proposed measures should be taken if receiving ernd’s SCR is less than 1.4 to ensure systerms stablility. The results can provide the theoretical guidance for VSC-HVDC industrial application access to weak AC power grid in actual projects.

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