With the development of power system,the operation mode of powersystem is becoming more and more complex.In order to improve the security level of power system operation,a knowledge-driven method for calculating the t...With the development of power system,the operation mode of powersystem is becoming more and more complex.In order to improve the security level of power system operation,a knowledge-driven method for calculating the transmission section limit of large-scale power grid is proposed.Firstly,a calculation model of transmission section limit is established by comprehensively considering static security and stability constraints and transient stability constraints of a large power grid;Then,a knowledge-driven calculation method of transmission section limit is proposed,which makes the calculation process of transmission section limit knowledgeable through knowledge mapping,and the implementation scheme of generator autonomous search and generator optimal switching is designed to realize the fast calculation of transmission section limit of large power grid.Finally,the effectiveness and correctness of the proposed method are verified in a regional power grid with 2128 nodes and a cross-regional power grid with 12643nodes in China.展开更多
In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, doe...In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, does not provide full interaction of a steel beam and a concrete slab. This changes strain distribution in cross-sections of a composite girder and results in redistribution of internal forces in steel and concrete element. In the paper partial interaction index defined on the basis of a neutral axis position, which can be used for verification of steel-concrete interaction in real bridge structures rather than in specimens is proposed. The range of the index value changes, obtained during load testing of a typical steel-concrete composite beam bridge, is presented. The investigation was carried out on a motorway viaduct, consisting of two parallel structures. During the testing values of strains in girders under static and quasi-static loads were measured. The readings from the gauges were used to determine the index, characterizing composite action of the girders. Results of bridge testing under movable load, changing position along the bridge span is presented and obtained in-situ influence functions of strains and index values are commented in the paper.展开更多
基金supported by the Science andTechnology Project of State Grid:Research on artificial intelligence analysis technology of available transmission capacity(ATC)of key section under multiple power grid operation modes(5100-202255020A-1–1-ZN).
文摘With the development of power system,the operation mode of powersystem is becoming more and more complex.In order to improve the security level of power system operation,a knowledge-driven method for calculating the transmission section limit of large-scale power grid is proposed.Firstly,a calculation model of transmission section limit is established by comprehensively considering static security and stability constraints and transient stability constraints of a large power grid;Then,a knowledge-driven calculation method of transmission section limit is proposed,which makes the calculation process of transmission section limit knowledgeable through knowledge mapping,and the implementation scheme of generator autonomous search and generator optimal switching is designed to realize the fast calculation of transmission section limit of large power grid.Finally,the effectiveness and correctness of the proposed method are verified in a regional power grid with 2128 nodes and a cross-regional power grid with 12643nodes in China.
文摘In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, does not provide full interaction of a steel beam and a concrete slab. This changes strain distribution in cross-sections of a composite girder and results in redistribution of internal forces in steel and concrete element. In the paper partial interaction index defined on the basis of a neutral axis position, which can be used for verification of steel-concrete interaction in real bridge structures rather than in specimens is proposed. The range of the index value changes, obtained during load testing of a typical steel-concrete composite beam bridge, is presented. The investigation was carried out on a motorway viaduct, consisting of two parallel structures. During the testing values of strains in girders under static and quasi-static loads were measured. The readings from the gauges were used to determine the index, characterizing composite action of the girders. Results of bridge testing under movable load, changing position along the bridge span is presented and obtained in-situ influence functions of strains and index values are commented in the paper.
