A Branch-independence-based Reliability Assessment Approach for Transmission Systems  

作　　者：Shuonan Hou Pei Zhang Wei Zhang Qian Xiao Xiaonan Liu 

机构地区：[1]Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin,China [2]School of Electrical Engineering,Beijing Jiaotong University,Beijing,China [3]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing,China [4]State Grid Tianjin Electric Power Research Institute,Tianjin,China

出　　处：《Journal of Modern Power Systems and Clean Energy》2023年第2期651-661,共11页现代电力系统与清洁能源学报（英文）

基　　金：supported by the China Postdoctoral Science Foundation (No.2020TQ0222)。

摘　　要：This paper proposes a branch-independence-based reliability assessment approach for transmission systems.The approach consists of branch decoupling and state-space partition techniques.By integrating an impact-increment-based reliability index calculation model and the proposed branch decoupling technique,a proportion of sampled contingency states no longer need to be analyzed using the time-consuming optimal power flow(OPF)algorithm.In this way,the technique speeds up the calculation of reliability indices.Since first-order contingency states have a high probability of being sampled,we propose a state-space partition technique to replace first-order contingency state simulation with first-order contingency state enumeration.Consequently,the calculation of reliability indices is further accelerated by avoiding a large amount of repetitive OPF analyses during simulation process without affecting reliability index accuracy.The validity and applicability of our approach are verified using the IEEE 118-bus and IEEE 145-bus systems.Numerical results indicate that the proposed approach can improve computational efficiency without decreasing accuracy.

关 键 词：Branch decoupling impact increment optimal power flow(OPF) reliability assessment state-space partition transmission system 

分 类 号：TM732[电气工程—电力系统及自动化]