基于变压器延边三角形接法的36脉波整流系统研究

在大功率整流领域,通常采用多脉波整流技术来降低整流系统谐波含量,提高功率因数。提出了一种基于移相变压器延边三角形接法的36脉波整流系统结构,分析了整流系统的工作原理、系统网侧输入电流特性及直流输出电压特性,给出了移相变压器绕组参数计算方法,并推导了平衡电抗器选择条件。利用MATLAB/Simulink建立了36脉波整流系统模型,对理论分析进行了仿真验证,观测了传统6脉波整流系统和36脉波整流系统的输出电压波形及网侧电流谐波含量。对比了不同程度电网不平衡情况下,36脉波整流系统与传统6脉波整流系统输出电压波形、网侧电压总谐波含量(THD)和电流谐波含量。实验结果表明,36脉波整流系统整流电压波形和网侧电流谐波含量与理论分析一致,能够有效降低网侧电流谐波含量和输出电压脉动,且具有较好的抵抗电网不平衡的能力,较6脉波整流系统有很大的优越性。

36-pulse Rectification System Based on Stretch Triangle Connection of Transformer

Multi-pulse rectification technology is widely used in high-power rectification field to reduce harmonics and increase power factor.A new 36-pulse rectification system based on stretch triangle connection of transformer is proposed and simulated by MATLAB/Simulink in this paper.Its working principle and output characteristics are analyzed.The output voltage waveforms and current harmonic contents of two multi-pulse rectification systems are compared and analyzed.The impacts of unbalanced input voltage on different multi-pulse rectification systems are also studied.The simulation results are in accordance with the theoretical analysis.Conclusion is drawn that the 36-pulse rectification system can reduce harmonic pollution and smooth output DC voltage effectively,and gains stronger capability to resist the unbalanced input voltage than the conventional 6-pulse rectification system.