中频变压器绕组非正弦周期载荷振动特性分析  

Analysis of winding vibration characteristics of middle-frequency transformer under non-sinusoidal periodic excitation

作　　者：陆格野 孙路 刘宏亮 LU Geye;SUN Lu;LIU Hongliang(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;State Grid Hebei Electric Power Research Institute,State Grid Corporation of China,Shijiazhuang 050021,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]国网河北省电力有限公司电力科学研究院,河北石家庄050021

出　　处：《电机与控制学报》2024年第4期11-17,30,共8页Electric Machines and Control

基　　金：国家自然科学基金青年科学基金(52207208)。

摘　　要：针对非正弦周期载荷作用下的中频变压器绕组振动问题,建立柱坐标下的圆筒形绕组和笛卡尔坐标下的矩形绕组动力响应数值计算模型,模型考虑了电磁-结构扰动的耦合关系。根据屈服条件和流动理论,建立变压器绕组弹塑性变形的动力平衡方程。引入夹层模型简化计算,计算得到夹层模型薄层间距,可用于绕组拉伸、压缩变形等效建模。通过一台中频变压器算例进行非正弦周期载荷作用下绕组动力响应的实验测量和数值计算。研究表明,三角波载荷与正弦波载荷作用下绕组振动特性相同,而矩形波载荷作用下绕组振动在激励周期内几乎不衰减。发生故障工况时,由于高频振动,绕组残余形变迅速积累。2 kHz的矩形波载荷作用下绕组在1 ms内极限载荷强度可下降至1/4。A numerical calculation model for the dynamic response of cylindrical and rectangular windings under non-sinusoidal periodic excitation was established to solve the vibration problem of the medium fre-quency transformer windings.The model considered the coupling relationship between electromagnetic-structure disturbance.A dynamic balance equation for the elastic-plastic deformation of the transformer winding was established.The sandwich model was introduced to simplify the calculation,and the spacing of the thin layers in the sandwich model was calculated,which could be used for effective modeling of winding stretching and compressing deformation.An example of a medium frequency transformer was used to measure the dynamic response of the winding under non-sinusoidal periodic excitation and numer-ical calculations were performed.Studies have shown that the vibration characteristics of the winding un-der triangular wave and sine wave loads are identical.However,under rectangular wave loads,the vibra-tion of the winding almost does not decay during the excitation period.In case of fault conditions,due to high frequency vibration,the residual deformation of the winding quickly accumulates.Under a 2 kHz rectangular wave load,the limit load strength of the winding can drop to 1/4 within 1 ms.

关 键 词：中频变压器 机械振动 绕组强度 动力响应 非正弦周期载荷 极限载荷强度 

分 类 号：TM402[电气工程—电器]