This paper proposes an impact-increment-based hybrid (IIHybrid) reliability assessment approach for power transmission systems.The proposed approach integrates the advantages of the impact-increment-based state enumeration method (IISE) and impact-increment-based Monte Carlo sim-ulation (IIMC) to improve computational efficiency and accu-racy.The IISE can efficiently assess the impacts of low-order contingencies.The accuracy is,however,sacrificed as high-order contingencies are usually neglected.The IIMC is more suitable for large-scale contingency spaces compared with IISE,although the calculation process is time-consuming.In this paper,the proposed IIHybrid takes advantage of its strengths while avoiding its shortcomings.The IISE and the IIMC are applied to lower and higher contingency spaces respectively.The high-order contingencies elimination technique proposed in our previous studies is still applicable to the IIHybrid.In addition,efficiency can be controlled by modifying the preset parameters to adapt to various scenarios.Case studies are performed on the IEEE 118-bus test system and PEGASE System.The results show that the proposed approach is more efficient and practicable than traditional methods.

Yunkai Lei;Yeguang Sun;Kai Hou;Pei Zhang;Lewei Zhu;Xiaoxi Yang;Xiaonan Liu

State Grid Sichuan Economic Re-search Institute,Chengdu,610000 China;State Grid Customer Service Center,Tianjin 300072,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;School of Electrical and Automation Engineering,East China Jiaotong Unviersity,Nanchang 330052,China;Maritime College,Tianjin University of Technology,Tianjin 300384,China;College of Economics and Management,Southwest Petroleum University,Chengdu 610000,China;State Grid Tianjin Electric Power Research Institute,Tianjin 300072,China

中国电机工程学会电力与能源系统学报（英文版）

[1]Yunkai Lei;Yeguang Sun;Kai Hou;Pei Zhang;Lewei Zhu;Xiaoxi Yang;Xiaonan Liu-.Impact Increment Based Hybrid Reliability Assessment Method for Transmission Systems)[J].中国电机工程学会电力与能源系统学报（英文版）,2022(01):317-328

Increment,IIHybrid,IISE,IIMC,contingencies,PEGASE

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