电气化铁路节能型卷铁心牵引变压器建模与仿真

发布时间：2018-08-15 14:42

【摘要】：随着电气化铁路的快速发展,牵引变压器的数量和容量变得越来越大,而我国电气化铁路牵引负荷率却不高,使得牵引变压器的空载损耗问题变得不容忽视。因此,牵引变压器的节能研究就变得刻不容缓。相比于其他的变压器节能技术,卷铁心技术在经济性与可行性等方面具有一定优势。节能型卷铁心牵引变压器采用卷铁心技术为核心技术。该节能型卷铁心牵引变压器因其铁心特殊性,利用常规的分析方法在仿真时会存在一些欠缺,而有限元法在仿真分析这类特殊结构的变压器时具有优势。以往的卷铁心变压器有限元研究多集中于农网和城网配电变压器等方面,就牵引变压器而言,这类研究还比较缺乏。本文在Ansoft Maxwell中建立了节能型卷铁心牵引变压器的有限元模型,并对建模方法进行了验证。运用该有限元模型,主要完成了以下工作：节能型卷铁心牵引变压器的空载试验及短路试验仿真。结合实际绕组的接线方式,设计并搭建了节能型卷铁心牵引变压器三维瞬态场有限元模型的外加激励电路模型,利用有限元模型对节能型卷铁心牵引变压器进行了仿真。仿真结果表明：与同等容量叠铁心牵引变压器相比,节能型卷铁心牵引变压器空载电流下降50%左右,空载损耗减少24%左右,短路电压百分比也有所下降。仿真结果与理论分析结果相符。铁心温度场仿真。运用ANSYS Workbench仿真平台搭建了节能型卷铁心牵引变压器的电磁—热耦合仿真模型,结合过负荷曲线,对其在不同负荷情况下的铁心温度分布进行了仿真。仿真结果表明该卷铁心满足牵引变压器过负荷运行要求。相比于同等容量的叠铁心变压器,节能型卷铁心牵引变压器铁心内温度分布更加均匀,平均温度更低,该仿真结果与卷铁心磁通分布更加均匀的理论分析结果相符,同时也验证了温度场仿真模型的正确性。
[Abstract]:With the rapid development of electrified railway, the number and capacity of traction transformers become larger and larger, but the traction load rate of electrified railway in China is not high, so the no-load loss problem of traction transformers can not be ignored. Therefore, the study of traction transformer energy conservation becomes urgent. Compared with other transformer energy saving technology, coiling core technology has some advantages in economy and feasibility. Energy-saving core-core traction transformer uses core-core technology as the core technology. Because of the particularity of the core, the conventional analysis method will have some shortcomings in the simulation, but the finite element method has the advantage in the simulation of this kind of special structure transformer. In the past, the finite element analysis of coiled core transformers is mainly focused on rural power networks and urban power distribution transformers, but in terms of traction transformers, this kind of research is still lacking. In this paper, the finite element model of energy saving core-core traction transformer is established in Ansoft Maxwell, and the modeling method is verified. By using the finite element model, the following works are accomplished: the no-load test and short-circuit test simulation of the energy-saving core-core traction transformer. Combined with the connection mode of the actual winding, the external excitation circuit model of the three-dimensional transient field finite element model of the energy-saving core-core traction transformer is designed and built, and the simulation of the energy-saving core-core traction transformer is carried out by using the finite element model. The simulation results show that compared with the same capacity stacked core traction transformer, the no-load current, no-load loss and short-circuit voltage percentage of energy-saving core-core traction transformer are reduced by about 50%, 24% and 24% respectively. The simulation results agree with the theoretical analysis results. Simulation of core temperature field. The electromagnetic and thermal coupling simulation model of energy-saving coil core traction transformer is built by using ANSYS Workbench simulation platform. The temperature distribution of the core is simulated under different load conditions combined with the overload curve. The simulation results show that the coil core meets the requirements of traction transformer overload operation. Compared with the stack core transformer of the same capacity, the temperature distribution in the core of the energy saving core-core traction transformer is more uniform and the average temperature is lower. The simulation results are consistent with the theoretical analysis of the more uniform magnetic flux distribution of the core-core. At the same time, the correctness of the simulation model of temperature field is verified.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U224

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