基于PSCAD-ANSYS的变压器绕组振动特性仿真研究

摘要

To further understand the vibration mechanism of transformer winding,the whole simulation of winding vibration response under short circuit was made based on the co-simulation of PSCAD and ANSYS software.The short-circuit current was obtained based on the electro-magnetic transient analysis of PSCAD software under sudden short-circuit impact.Then the simulation of magnetic field and mechanical field excited by the short circuit current was achieved and the transformer vibration characteristics excited by the electro-dynamic force was acquired.The data communication mechanism has been elegantly designed and implemented to combine the electrical model and vibration model,which makes the co-simulation more intergratded and rigorous.With the developed simulation model,the vibration response of a power transformer in the 110kV substation was calculated and the effectiveness of the proposed simulation method was verified.When sudden short-circuit was occurred,the vibration response of transformer winding was increased greatly and then reduced gradually,which was similar to the variation trend of short-circuit current.The frequency component of vibration signals are more complicated.%为进一步理解和掌握短路冲击下变压器绕组的振动特性,本文基于PSCAD-ANSYS联合仿真实现了变压器突发短路下振动响应的全过程分析,即根据PSCAD软件计算得到的变压器绕组短路电流,在ANSYS软件中使用电磁场和机械场模块计算了变压器绕组的电动力和振动响应.其中,两个软件之间的电流和时间等关键信息的交换通过数据通信接口方式实现.以某110kV变电站为例对变压器突发短路下的振动响应进行计算分析,结果表明,所提出的联合仿真方法能够有效计算突发短路时变压器绕组的振动特性.突发短路时,变压器振动响应与短路电流变化趋势类似,绕组振动在短路故障发生后先达到最大值,然后伴有一定的衰减分量,振动信号频谱分量更加丰富.