Real-time Decision-making Method of Splitting Time Considering Transient Stability of Isolated Power Grid After Splitting

被引：0
|
作者：
Liu F. [1 ,2 ]
Fang Y. [1 ,2 ]
Wu X. [3 ]
机构：
[1] School of Electrical and Electronic Engineering, North China Electric Power University, Beijing
[2] State Key Laboratory of Smart Grid Protection and Control, Nanjing
[3] NARI Technology Co., Ltd., Nanjing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2022年 / 46卷 / 22期
基金：
中国国家自然科学基金;
关键词：
extended equal area criterion (EEAC); power grid splitting; stability margin; transient energy; transient stability;
D O I：
10.7500/AEPS20210721006
中图分类号：
学科分类号：
摘要：
Out-of-step splitting time is a key parameter that affects whether the isolated network can maintain synchronous and stable operation after splitting. Real-time decision-making of splitting time considering transient stability constraints of isolated power grid is a difficult problem that needs continuous research. This paper analyzes the problems faced by real-time accurate judgment of the transient stability of isolated power grid after splitting at the time of splitting, sorts out the key factors to be considered in real-time decision-making at the time of splitting, and divides the decision-making problem into three sub-problems, i.e., judgment of the allowable duration of out-of-step oscillation, identification of isolated power grid with the smallest transient stability margin after splitting, and judgment of the time when the local maximum of the transient stability margin of isolated power grid after splitting. Under the assumption that the system motion trajectory can be obtained without delay, a real-time decision-making method for splitting time is proposed. The proposed method uses the instability or out-of-step of the original system as the starting criterion, and takes the acceptability of the power grid for the duration of out-of-step oscillation and the transient stability margin of the isolated power grid after splitting satisfies the set threshold as constraints. According to the estimated variation trend index of the transient stability margin of the isolated power grid after splitting with the time of splitting, the occurrence time of the maximum value of the transient stability margin of the isolated power grid is identified, and the implementation of the splitting control is triggered. The feasibility and effectiveness of the proposed decision-making method are verified by an example. © 2022 Automation of Electric Power Systems Press. All rights reserved.
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页码：83 / 89
页数：6
相关论文
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