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基于高频多脉变压器的中高压变流器的建模和分析

, PP. 39-44

Keywords: 多脉整流器,高频多脉移相变压器,建模与分析,中高压整流系统,谐波消除技术

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Abstract:

利用高频多脉移相变压器的方式可以有效消除网侧5次和7次谐波,并能解决现有工频多脉移相变压器体积过大、重量偏重的缺点。本文为了对基于高频多脉变压器的中高压变流器直流侧电压以及电网侧的谐波含量进行定量的数学分析,建立变流器的系统模型。通过对功率单元以及直流侧的12脉整流器的电压、电流分别建立开关状态方程,可得网侧电流是关于Io的方程式,并且与工频多脉整流具有相同的数学表达形式,因此可以在数学上证明高频方案同样可以有效消除网侧5次和7次谐波。基于TMS320F2407与CPLD联合控制平台搭建的3300V,20kVA实验样机,验证了模型以及数学理论分析的正确性。此类型变流器采用多模块级联的方式,主要适用于中高压整流场合,并能够得到较好的输入电流质量。

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