基于Matlab的串并联转换模型的单相线性变压器运行过程模拟

The simulation of single-phase linear transformers of series parallel conversion model based on Matlab

变压器是电力系统中一个极其重要的设备,它为我国经济发展提供可靠、不间断能源,因此研究变压器运行特性具有重要意义.首先,给出变压器空载运行、负载运行及等效电路参数折算的数学模型.然后,提出一种串并联模型励磁参数标幺值转换公式,使单相变压器模型的计算结果更准确.最后,利用Matlab/Simulink建立变压器运行状态的仿真模型.仿真结果表明:空载运行时的变比k=U_1/U_2;TTSC计算的励磁电流值更准确;变压器瞬间加入负载,I_2变大,I_1变大,U_2略微减小;负载开闸后的U_2出现异常短暂反向大幅振动;负载短路故障后的故障电流超过正常负载电流的7倍,为诊断变压器过负荷运行提供理论支持.

Transformer is one of the most important equipments in power system that provides a reliable and uninterrupted energy for the development of our country＇s economy, so it is important to study the operation characteristics of the transformer. Firstly, the mathematical model of the transformer no load operation, load operation and equivalent circuit parameters were given. Then, a series parallel model was proposed based on the formula of the parameters of the excitation parameters, which makes the calculation results more accurate. Finally, the simulation model of transformer operating state was established by using Matlab/Simulink. The simulation results show that the no load ratio of k=U1/U2; TTSC is excitation current calculation; when transformer load moment I2 and I1 increased,U2 decreased slightly ; load abnormal transient reverse vibration appeared; fault current after short circuit fault is 7 times more than the normal load current. The results may provide theoretical support for the diagnosis of transformer overload operation.