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Power swing and voltage collapse identification schemes for correct distance relay operation in power system

Journal of Central South University 2013年第4期20卷 988-1000页

作者： Ahmad F. Abidin Azah Mohamed Hussain Shareef Department of Electrical Electronic and Systems Engineering Universiti Kebangsaan Malaysia

The new techniques were presented for preventing undesirable distance relay maloperation during voltage collapse and power swings in transmission grids. Initially, the work focused on the development of a fast detection of voltage collapse and a three-phase fault at transmission lines by using under impedance fault detector (UIFD) and support vector machine (SVM). Likewise, an intelligent approach was developed to discriminate a fault, stable swing and unstable swing, for correct distance relay operation by using the S-transform and the probabilistic neural network (PNN). To illustrate the effectiveness of the proposed techniques, simulations were carried out on the IEEE 39-bus test system using the PSS/E and MATLAB software.

关键词： under impedance fault detector distance relay fault voltage collapse

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

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Protection and Control of Modern Power Systems 2023年第1期8卷 112-138页

作者： Salah Mokred Yifei Wang Tiancong Chen Electrical Engineering Department Southeast UniversityNanjing 210096China Electromechanical Engineering School Zhongyuan Institute of Science and TechnologyZhengzhou 450007China

voltage instability is a serious phenomenon that can occur in a power system because of critical or stressed *** prevent voltage collapse caused by such instability,accurate voltage collapse prediction is necessary for power system planning and *** paper proposes a novel collapse prediction index(NCPI)to assess the volt-age stability conditions of the power system and the critical conditions of *** 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 *** study also presents the sensitivity assumptions of existing indices and analyzes their impact on voltage collapse *** application results under intensive case studies prove that the proposed index NCPI adapts to several operating power *** 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 *** and generation unit outage contingencies are examined to identify the lines and generators that significantly impact system stability in the event of an *** 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

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A New Proximity Indicator for Assessment of voltage Stability and Critical Loadability Point

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Energy Engineering 2022年第3期119卷 947-963页

作者： Chandrakant Dondariya D.K.Sakravdia Department of Electrical Engineering Ujjain Engineering CollegeUjjainIndia

This paper presents a newly developed proximity indicator for voltage stability assessment which can be used to predict critical real system load and voltages at various load buses at critical loading *** proximity indicator varies almost parabolic with total real load demand and reaches orthogonally to real load *** relation has been utilized to predict critical loading *** has been shown that two operating points are needed for estimating critical point and proper selection of operating points and variation of proximity indicator near collapse point highly affect the accuracy of *** is based on load flow equations and system real and reactive loadings have been increased in proportion with base case scenario for IEEE 14 and IEEE 25 bus test systems to demonstrate the behaviour of proposed proximity *** has been used as benchmark to check the accuracy of estimation.

关键词： voltage stability voltage collapse proximity indicator critical loading CPF

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