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Mode Tracking Scheme Among Remeshed Models for Structural Optimization
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作者 LIU Jun DING Ziqi +1 位作者 LU Qi HAN Xianhong 《Journal of Shanghai Jiaotong university(Science)》 EI 2019年第6期706-715,共10页
Mode tracking is required in the structural optimization when the frequencies of certain specified modes must be maintained within a suitable range.A simple tracking method employing the mode number is invalid or misl... Mode tracking is required in the structural optimization when the frequencies of certain specified modes must be maintained within a suitable range.A simple tracking method employing the mode number is invalid or misleading when local modes appear or disappear during mesh updating.In this work,a mode tracking scheme combining the nearest neighbor method(NNM)with the modal assurance criterion(MAC)is proposed.Several NNM algorithms are compared,and the k-dimensional tree(kd-tree)NNM is used to transform eigenvectors(mode shapes)from different scales to identical one.A threshold determination method is implemented for the MAC to assess the similarities in all the calculated modes.On the basis of the mode tracking scheme,specified modes can be tracked between different finite element method(FEM)models which have different meshes and optimized shapes.The effectiveness is verified through an example of shape optimization using an electric motor structure. 展开更多
关键词 mode tracking scheme remeshed models optimization process nearest neighbor method(NNM) modal assurance criterion(MAC)
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Coordination of PSS and FACTS Damping Controllers to Improve Small Signal Stability of Large-scale Power Systems 被引量:2
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作者 Guangzheng Yu Tao Lin +2 位作者 Jiannan Zhang Ye Tian Xiu Yang 《CSEE Journal of Power and Energy Systems》 SCIE CSCD 2019年第4期507-514,共8页
This paper presents an approach for designing parameters of power system stabilizer(PSS)and FACTS damping controllers in a large scale practical power system.The objective is maximizing damping ratio of the target mod... This paper presents an approach for designing parameters of power system stabilizer(PSS)and FACTS damping controllers in a large scale practical power system.The objective is maximizing damping ratio of the target mode,and tracking technology(MTT)is used to avoid frequent alternations of target mode in optimization procedures.An improved planted growth simulation algorithm(IPGSA),which has high search efficiency and quick convergence speed,is proposed to optimize controller parameters coordinately.Based on case study of a large-scale power grid,and by using local and interregional low-frequency oscillation modes as target modes,simulation results verify proposed method in this paper.Furthermore,coordination optimization strategy adapted to multi-operating conditions demonstrates that the proposed approach is robust. 展开更多
关键词 Coordinating optimization large-scale power grid mode tracking technology PSS and FACTS damping controllers small signal stability
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