软母线连接变电站电气设备的地震响应分析
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摘要
地震作用下变电站软母线连接的电气设备间存在复杂的动力相互耦联作用。将软母线简化为悬索,引入软母线和电气设备间变形协调条件,推导悬索的张力和张力刚度的表达式,建立悬索连接设备体系的动力作用分析数学模型,采用龙格库塔方法对数学模型进行求解。对模型中主要影响因素的参数分析和算例表明:由于连接母线的存在,耦联设备的响应和单体设备的响应有很大不同,软母线连接电气设备的响应具有明显的非线性特点,母线的张力变化呈现突变特征。在进行变电站设备的抗震设计中,必须考虑软母线对设备的耦联作用。所提出的设备耦联体系地震响应的数学模型可用于研究任意频率的设备与母线在地震作用下的响应。
Complicated interactions exist in the flexible bus connected substation equipment under earthquake.In this paper,firstly,the flexible bus was simplified as a cable.By introducing deformation compatibility condition between the substation equipment and the flexible bus,the tension and tension stiffness of the cable were derived.Then a mathematical model for analyzing the dynamic interaction between the equipment and the cable was proposed and solved by using the Runge-Kutta method.The following case study and parametric analysis showed that due to the interconnection by the cable,the seismic response of the coupling system,which was different from that of the independent equipment,exhibited strong nonlinearity and the tension in the cable varied abruptly under earthquake action.The results demonstrated that the interaction between the flexible bus and the equipment should be considered in the seismic design of substation equipment and the mathematical model derived in this paper could be used to analyze the seismic response of the equipment in random frequency interconnected by the flexible buses.
Complicated interactions exist in the flexible bus connected substation equipment under earthquake.In this paper,firstly,the flexible bus was simplified as a cable.By introducing deformation compatibility condition between the substation equipment and the flexible bus,the tension and tension stiffness of the cable were derived.Then a mathematical model for analyzing the dynamic interaction between the equipment and the cable was proposed and solved by using the Runge-Kutta method.The following case study and parametric analysis showed that due to the interconnection by the cable,the seismic response of the coupling system,which was different from that of the independent equipment,exhibited strong nonlinearity and the tension in the cable varied abruptly under earthquake action.The results demonstrated that the interaction between the flexible bus and the equipment should be considered in the seismic design of substation equipment and the mathematical model derived in this paper could be used to analyze the seismic response of the equipment in random frequency interconnected by the flexible buses.
引文
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[19]俞载道.结构动力学基础[M].上海:同济大学出版社,1985:45-59.Yu Zaidao.Structural dynamics[M].Shanghai:Tongji University Press,1985:45-59(in Chinese).
[20]沈世钊,徐崇宝,赵臣,等.悬索结构设计[M].2版.北京:中国建筑工业出版社,2006:89-91.Shen Shizhao,Xu Chongbao,Zhao Chen,et al.Cable structural design[M].The 2nd edition.Beijing:China Building Industry Press,2006:89-91(in Chinese).
[2]谢强,王亚非,魏思航.软母线连接的变电站开关设备地震破坏原因分析[J].电力建设,2009,30(4):10-14.Xie Qiang,Wang Yafei,Wei Sihang.Seismic failure analysis on substation equipment interconnected by flexible conductor[J].Electric Power Construction,2009,30(4):10-14(in Chinese).
[3]Okada T.Seismic design of connecting leads in open-air type substations[C]//Proceedings of the International Conference on Large High Voltage Electric Systems.Paris,France:CIGRE,1986:23.04.1-23.04.8.
[4]Richter H L.Post-quake lessons for power utilities[J].IEEE Spectrum,1988(25):46-48.
[5]Dastous J B,Pierre J R.Experimental investigation on the dynamic of flexible conductors between substation equipment during an earthquake[J].IEEE Transactions on Power Delivery,1996,11(2):801-806.
[6]Dastous J B,Filiatrault A,Pierre J R.Estimation of displacement at interconnection points of substation equipment subjected to earthquakes[J].IEEE Transactions on Power Delivery,2004,19(2):618-628.
[7]Dastous J B.Nonlinear finite-element analysis of stranded conductors with variable bending stiffness using the tangent stiffness method[J].IEEE Transactions on Power Delivery,2005,20(1):328-338.
[8]Dastous J B,Paquin J Y.Testing and development of alternative flexible-bus geometries for interconnected substation equipment subjected to earthquakes[J].IEEE Transactions on Power Delivery,2003,18(3):772-780.
[9]Bhuyan G S,Zhai E,Ghalibafian H,et al.Seismic behavior of flexible conductors connecting substation equipment,part I:static and dynamic properties of individual components[J].IEEE Transactions on Power Delivery,2004,19(4):1673-1677.
[10]Ghalibafian H,Bhuyan G S,Ventura C,et al.Seismic behavior of flexible conductors connecting substation equipment,part II:shake table test[J].IEEE Transactions on Power Delivery,2004,19(4):92中国电机工程学报第30卷1680-1687.
[11]Dastous J B.Guidelines for seismic design of flexible buswork between substation equipment[J].Earthquake Engineering and Structural Dynamics,2007,36(8):191-208.
[12]Dastous J B,Pierre J R.Design methodology for flexible buswork between substation equipment subjected to earthquakes[J].IEEE Transactions on Power Delivery,2007,22(3):1490-1497.
[13]Filiatrault A,Stearns C.Electrical substation equipment interaction:experimental flexible conductor studies[R].California,USA:Pacific Earthquake Engineering Research Center,2002.
[14]Filiatrault A,Stearns C.Seismic response of electrical substation equipment interconnected by flexible conductors[J].Journal of Structural Engineering,2004,130(5):769-778.
[15]Kiureghian A D,Hong K J,Sackman J L.Further studies on seismic interaction in interacted electrical substation equipment[R].California,USA:Pacific Earthquake Engineering Research Center,2000.
[16]Song J H,Kiureghian A D,Sackman J L.Seismic interaction in electrical substation equipment connected by non-linear rigid bus conductors[J].Earthquake Engineering and Structural Dynamics,2007,36(2):167-190.
[17]Kiureghian A D,Sackman J L,Hong K J.Interaction in interconnected electrical substation equipment subjected to earthquake ground motions[R].California,USA:Pacific Earthquake Engineering Research Center,1999.
[18]Kiureghian A D,Sackman J L,Hong K J.Seismic interaction in linearly connected electrical substation equipment[J].Earthquake Engineering and Structural Dynamics,2001,30(3):327-347.
[19]俞载道.结构动力学基础[M].上海:同济大学出版社,1985:45-59.Yu Zaidao.Structural dynamics[M].Shanghai:Tongji University Press,1985:45-59(in Chinese).
[20]沈世钊,徐崇宝,赵臣,等.悬索结构设计[M].2版.北京:中国建筑工业出版社,2006:89-91.Shen Shizhao,Xu Chongbao,Zhao Chen,et al.Cable structural design[M].The 2nd edition.Beijing:China Building Industry Press,2006:89-91(in Chinese).
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