变压器的谐波传递特性研究

Research on Harmonic Transfer Characteristics of Transformer

基于变压器的T型等效电路,在考虑分布电容影响的情况下,建立了谐波工况下变压器的等效电路模型,并对其谐波传递特性进行了深入的分析计算,结果表明:在空载或轻载时,电源侧谐波在变压器中是线性传递的;而在其他情况下谐波通过变压器后发生畸变,负载侧的谐波含有率跟电源侧相比变化很大。采用Matlab仿真软件,对变压器在不同负载率下的谐波传递特性进行仿真分析,最后在实际变压器上进行了实验验证,实验结果与理论分析结果和仿真结果具有较好的一致性。

The harmonic equivalent model of transformer is established base on T type equivalent circuit of transformer with consideration of distributed capacitance effects. Thorough analysis and calculation of its harmonic transfer characteristics are performed. The result shows that in no-load or light load condition, the harmonic is linear transferred in transformer. In other cases harmonic components change significantly across transformer. Matlab software is used to analyze harmonic transfer characteristics of transformer under different load conditions. Experiments performed on actual transformer show consistency with theoretical analysis and simulation results.