A novel collapse prediction index for voltage stability analysis and contingency ranking in power systems  

作　　者：Salah Mokred Yifei Wang Tiancong Chen 

机构地区：[1]Electrical Engineering Department,Southeast University,Nanjing 210096,China [2]Electromechanical Engineering School,Zhongyuan Institute of Science and Technology,Zhengzhou 450007,China

出　　处：《Protection and Control of Modern Power Systems》2023年第1期112-138,共27页现代电力系统保护与控制（英文）

基　　金：supported by the National Natural Science Foundation of China under Grant 52007032;National Key R&D Program of China(2022YFB2703502);Basic Research Program of Jiangsu province under Grant BK20200385,China.

摘　　要：Voltage instability is a serious phenomenon that can occur in a power system because of critical or stressed condi-tions.To prevent voltage collapse caused by such instability,accurate voltage collapse prediction is necessary for power system planning and operation.This paper proposes a novel collapse prediction index(NCPI)to assess the volt-age stability conditions of the power system and the critical conditions of lines.The effectiveness and applicability of the proposed index are investigated on the IEEE 30-bus and IEEE 118-bus systems and compared with the well-known existing indices(Lmn,FVSI,LQP,NLSI,and VSLI)under several power system operations to validate its practicability and versatility.The study also presents the sensitivity assumptions of existing indices and analyzes their impact on voltage collapse prediction.The application results under intensive case studies prove that the proposed index NCPI adapts to several operating power conditions.The results show the superiority of the proposed index in accurately estimating the maximum load-ability and predicting the critical lines,weak buses,and weak areas in medium and large networks during various power load operations and contingencies.A line interruption or generation unit outage in a power system can also lead to voltage collapse,and this is a contingency in the power system.Line and generation unit outage contingencies are examined to identify the lines and generators that significantly impact system stability in the event of an outage.The contingencies are also ranked to identify the most severe outages that significantly cause voltage collapse because of the outage of line or generator.

关 键 词：Voltage stability indices Voltage collapse NCPI Weak buses and critical lines Maximum load-ability Contingency ranking and analysis 

分 类 号：TM721.1[电气工程—电力系统及自动化]