Short-circuit Current Calculation Method for Near-end Bus of Unified Power Flow Controller

Ning ZHOU; Zhang ZHANG; Tao LIANG; Ying WANG; Bo YUAN; Hao WU

doi:10.7500/AEPS20200316007

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Short-circuit Current Calculation Method for Near-end Bus of Unified Power Flow Controller

Basic Research | 更新时间：2025-06-16

- Short-circuit Current Calculation Method for Near-end Bus of Unified Power Flow Controller
- Automation of Electric Power Systems Vol. 44, Issue 15, Pages: 95-102(2020)
- 作者机构：
  
  1. 浙江大学电气工程学院,浙江省杭州市 310027
  2. 国网河北省电力有限公司经济技术研究院,河北省石家庄市 050011
- 作者简介：
- 基金信息：
- DOI：10.7500/AEPS20200316007
  CLC：
- Received：16 March 2020，
  
  Revised：2020-04-22，
  
  Published Online：06 June 2020，
  
  Published：10 August 2020
- 稿件说明：
移动端阅览
周宁,张章,梁涛等.统一潮流控制器近端母线的短路电流计算方法[J].电力系统自动化,2020,44(15):95-102.

ZHOU Ning,ZHANG Zhang,LIANG Tao,et al.Short-circuit Current Calculation Method for Near-end Bus of Unified Power Flow Controller[J].Automation of Electric Power Systems,2020,44(15):95-102.
周宁,张章,梁涛等.统一潮流控制器近端母线的短路电流计算方法[J].电力系统自动化,2020,44(15):95-102. DOI： 10.7500/AEPS20200316007.

ZHOU Ning,ZHANG Zhang,LIANG Tao,et al.Short-circuit Current Calculation Method for Near-end Bus of Unified Power Flow Controller[J].Automation of Electric Power Systems,2020,44(15):95-102. DOI： 10.7500/AEPS20200316007.

摘要

针对目前实际投运的统一潮流控制器（UPFC)及其采用的故障控制策略，基于电网络理论推导了UPFC近端母线短路电流的计算方法。使用UPFC串联线路对故障母线的转移导纳描述了UPFC的近端母线，由于UPFC串联侧在近端母线故障时立即被旁路保护，导致故障母线的戴维南等值电势发生突变，进而对短路电流的计算结果产生影响，计算结果的相对变化与UPFC故障前运行电压和电流分布系数有关。在IEEE 9节点系统中，研究了运行条件变化以及UPFC参数变化对短路电流的影响，并使用PSCAD对计算结果进行了仿真验证；在IEEE 118节点系统中，分析了UPFC对大规模电网短路电流的影响。结果表明，UPFC对其两侧母线短路电流的影响相反，且对近端母线短路电流的影响随着电气距离增大而减小。

Abstract

In view of the existing unified power flow controller (UPFC) in actual operation and its fault control strategy

a short-circuit current (SCC) calculation method for near-end bus of UPFC is derived based on the electric network theory. The near-end bus of UPFC is described by transfer admittance of UPFC series line to faulty bus. Since the series side of UPFC is immediately protected through bypass after the near-end bus fault

the Thevenin equivalent potential of the faulty bus changes suddenly

which affects the calculation result of SCC. The relative change of the calculation result is related to both the operation voltage of UPFC before the fault and the current distribution coefficient. The effects of operation condition change and UPFC parameter change on the SCC are studied in the IEEE 9-bus system and verified by PSCAD. The influence of UPFC on the SCC in large-scale power grid is analyzed in the IEEE 118-bus system. The results show that UPFC has the opposite effect on the SCC of bus on two sides

and the effect on the SCC of the near-end bus decreases with the increase of electrical distance.

关键词

Keywords

references

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