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Possibly non-unital operator system structures on a possibly non-unital function system
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作者 Jianze LI 《Frontiers of Mathematics in China》 SCIE CSCD 2012年第5期847-855,共9页
In this paper, we first give the definition of possibly non-unital function system, which is a characterization of the self-adjoint subspace of the space of continuous functions on a compact Hausdorff space with the i... In this paper, we first give the definition of possibly non-unital function system, which is a characterization of the self-adjoint subspace of the space of continuous functions on a compact Hausdorff space with the induced order and norm structure. Similar to operator system case, we define the unitalization of a possibly non-unital function system. Then we construct two possibly non-unital operator system structures on a given possibly non-unital function system, which are the analogues of minimal and maximal operator spaces on a normed space. These two structures have many interesting relations with the minimal and maximal operator system structures on a given function system. 展开更多
关键词 Possibly non-unital function system operator system possibly non-unital operator system
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Analytical Method of Fault Characteristic and Non-unit Protection for HVDC Transmission Lines 被引量:11
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作者 Xu Chu Guobing Song Jun Liang 《CSEE Journal of Power and Energy Systems》 SCIE 2016年第4期37-43,共7页
An analytical method of fault characteristic for the HVDC system based on frequency response characteristics of boundary elements is presented here.The computational formulas of transfer function and input impedance a... An analytical method of fault characteristic for the HVDC system based on frequency response characteristics of boundary elements is presented here.The computational formulas of transfer function and input impedance are deduced using the distributed parameter model of HVDC transmission line,and the amplitude-to-frequency-characteristics of the transfer function and input impedance are analyzed.Based on the amplitude-to-frequency difference between internal and external faults,a non-unit protection method for VSC-HVDC transmission line is presented.Using the current ratio of high-to-low-frequency,this protection method can distinguish internal from external fault.The presented algorithm only uses local-end current,has high operation speed,and is easy to implement.Simulations on a±200 kV VSC-HVDC system are conducted to demonstrate the validity and feasibility of the developed protection method. 展开更多
关键词 Analytical method of fault characteristic broadband signals HVDC transmission line non-unit protection
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