首页|Partition-based Network Equivalent Method for Power System Subsynchronous Oscillation Analysis
Partition-based Network Equivalent Method for Power System Subsynchronous Oscillation Analysis
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Given large-scale modern power systems with pow-er electronic converters,the numerical simulation with subsyn-chronous oscillation(SSO)faces great challenges in engineering practice due to sharply enlarged modeling scale and high com-putational burden.To reduce the modeling scale,network parti-tion and equivalent becomes a vital technique in numerical sim-ulations.Although several methods have been developed for net-work equivalent,a generally accepted rule for network parti-tion is still required.This paper proposes that the system can be partitioned into three parts,i.e.,the internal,the middle,and the external subsystems,in which the internal subsystem consists of all power electronic components,the middle subsys-tem includes those selected AC dynamic components with de-tailed models,and the remaining components and buses consti-tute the external subsystem.The external subsystem is further represented by an equivalent RLC network determined by the frequency dependent network equivalent(FDNE)method.In the proposed method,the observability index and the electrical distance index are used to identify the interface between the middle and the external subsystems.Case studies based on a modified Hydro-Quebec system are used to verify the efTective-ness of the proposed method.
Electrical distancenetwork equivalentsubsyn-chronous oscillationobservability index
Chenxuan Wang、Weimin Zheng、Zhen Wang、Yangqing Dan、Ping Ju
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Department of Electrical Engineering,Zhejiang University,Hangzhou 310027,China
Economic Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310016,China
College of Energy and Electrical Engineering,Hohai Univer-stiy,Nanjing 211100,China
Science and Technology Project of State Grid Zhejiang Electric Power Co.,LtdNational Natural Science Foundation of China
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