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A Closed-form Formulation of Eigenvalue Sensitivity Based on matrix calculus for Small-signal Stability Analysis in Power System

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1436-1445页

作者： Peijie Li Yucheng Wei Junjian Qi Xiaoqing Bai Hua Wei School of Electrical Engineering Guangxi University Department of Electrical and Computer Engineering Stevens Institute of Technology

With the rapid development of power-electronicsenabled power systems,the new converter-based generators are deteriorating the small-signal stability of the power *** the numerical differentiation method has been widely used for approximately calculating the eigenvalue sensitivities,its accuracy has not been carefully ***,the element-based formulation for computing closed-form eigenvalue sensitivities has not been used in any commercial software due to the average efficiency,complicated formulation,and errorprone *** on the matrix calculus,this paper proposes an easily manipulated formulation of the closed-form eigenvalue sensitivities with respect to the power *** distinguishing feature of the formulation is that all the formulas consist of vector and matrix operations,which can be performed by developed numerical algorithms to take full advantages of architectural features of the modern *** tests on WSCC 3-machine 9-bus system,New England 10-machine 39-bus system,and IEEE 54-machine 118-bus system show that the accuracy of the proposed formulation is superior to the numerical differentiation method and the efficiency is also greatly improved compared to the element-based closed-form *** proposed formulation will be helpful to perform a more accurate and faster stability analysis of a power grid with converter-based devices.

关键词： Closed-form formulation converter-based devices eigenvalue sensitivity matrix calculus small-signal stability

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Reliability of IEC 61850 based substation communication network architecture considering quality of repairs and common cause failures

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Protection and Control of Modern Power Systems 2022年第1期7卷 174-188页

作者： Vonani Clive Mathebula Akshay Kumar Saha School of Engineering Discipline of ElectricalElectronics and Computer EngineeringUniversity of KwaZulu-NatalDurbanSouth Africa

Mission-critical IEC 61850 system architectures are designed to tolerate hardware failures to achieve the highest reliability ***,multi-channel systems are used in such systems within industrial facilities to isolate machinery when there are process ***,multi-channel systems introduce Common Cause Failure(CCF)since the subsystems can rarely be *** paper integrates CCF into the Markov reliability model to enhance the model flexibility to investigate synchronous generator intra-bay SCN architecture reliability performance considering the quality of repairs and *** Markov process enables integration of the impact of CCF factors on system *** case study results indicate that CCF,coupled with imperfect repairs,significantly reduce system reliability *** sensitivity is observed at low levels of CCF,whereas the highest level of impact occurs when the system diagnostic coverage is 99%based on ISO 13849-1,and reduces as the diagnostic coverage level ***,it is concluded that the severity of CCF depends more on system diagnostic coverage level than the repair efficiency,although both factors impact the system overall ***,CCF should be con-sidered in determining the reliability performance of mission-critical communication networks in power distribution centres.

关键词： IEC 61850 Substation communication network(SCN) Reliability Common cause failure(CCF) Diagnostic coverage Repair efficiency Sensitivity Elasticity Markov matrix calculus

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A matrix METHOD FOR DESCRIBING UNPOLARIZED LIGHT AND ITS APPLICATIONS

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Acta Mechanica Sinica 1986年第4期2卷 362-372页

作者： Wang Jizhong (Shandong Polytechnic University,Jinan) Shandong Polytechnic University Jinan

A matrix method for describing fully depolarized light is *** to theproperties of fully depolarized light it is proved theoretically that this column matrix(Jones vector)can be used to describe unpolarized light as ***,it enables the problems of holographicphotoelasticity,including holographic photoelasticity of unpolarized light,to be simply treated byusing a unified matrix calculus(Jones calculus).

关键词： depolarized light unpolarized light holographic photoelasticity polarization holography matrix calculus

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