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RISS 인기검색어
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- 저자 : Ma Yiyi (검색결과 2 건)
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Yiyi Chen,Xiangxiang Wu,Hai Tian Zhao,Yue Ma 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.3
A series of cyclic loading test were caried out to investigate the performance of steel members with non-compact elementsdeteriorate quickly, but both the members and frames can develop enough non-elastic deformation and keep a certain resistancenecessary to prevent from complete colapse. The test results provide a foundation for the evaluation of the capacity of the non-compact element members and frames. A member section based capacity prediction method is proposed ignoring the so-calledP-Delta effect due to the relatively small axial force ratio of the light weight stel beam-columns, while the concept of effectivemechanism analysis is also tried to predict the ultimate of the frames under lateral cyclic loads. Though the failure type of thesteel beams and columns is diferent from those which have ful plastic capacity, the simplified method is proved to be ableto predict the ultimate satisfied. Furthermore, two criteria are provided to ensure the necesary capacity and ductility while thenon-compact or slender members are applied in the seismic zones; and corresponding limitations of ratio of width to thickness
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Zhao Chong,Wang Longze,Ma Yiyi,Xiang Pengfei,Jiang Siyu,Chen Weidong,Zhang Yan,Li Meicheng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
The output characteristics of variable speed pumped storage are different from conventional hydropower and constant speed pumped storage units. The continuous increase of installed capacity of variable speed pumped storage, poses a severe challenge to the safe and stable operation of the local power grid. Proposed in this paper is a kind suitable for multi-node containing variable speed pump machine storage unit electric power network transient stability method, considering the variable speed pumped storage units by the end of the instantaneous failure prone to sudden drop transient power, the power network with more nodes each busbar voltage stable operation as the goal, according to the regional power grid data under typical operation modes, Based on the power system analysis software package, an electromechanical simulation model of the 7-node power grid with variable speed pumped storage unit was established. The influence on the transient stability of a 7-node power grid is analyzed by removing variable speed pumped-storage units and three-phase short-circuit faults. The transient stability of the power grid can be maintained under the conditions of removing variable speed pumped-storage units and three-phase short-circuit faults, but some bus voltages are higher than the specified voltage upper limit. The reactive power compensation device is installed to improve the voltage stability of the power grid system, which can prevent the overvoltage accident caused by the fault of the communication system, achieve the purpose of multi-node power network stability, and improve the safety and stability of the regional power system when the fault occurs.
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