变压器辅助换流的谐振极型软开关逆变器

发布时间：2019-05-13 13:26

【摘要】：为提高逆变器的运行效率,提出了一种变压器辅助换流的谐振极型软开关逆变电路拓扑结构。该拓扑结构用高频变压器来辅助换流,没有设置串联在直流母线间的均压电容,解决了中性点电位变化问题。该逆变器的主开关和辅助开关均能完成软开关动作,并且所承受的电压都不高于直流电源电压。给出了一个开关周期内逆变器在不同工作模式下的等效电路图,详细阐述了该逆变器的工作过程,给出了软开关实现条件,并建立起了辅助电路损耗的数学模型,讨论了谐振参数对辅助电路损耗的影响。最后制作了一台4 k W的单相实验样机,实验结果表明逆变器中的开关器件都工作在软开关条件下。该有源谐振极型软开关逆变器可以有效提高效率,减小开关损耗。
[Abstract]:In order to improve the operation efficiency of inverter, a resonant pole type soft switching inverter circuit topology with transformer auxiliary converter is proposed. The topology uses high frequency transformer to assist the converter and does not set the voltage sharing capacitance between the DC bus in series, which solves the problem of neutral point potential change. The main switch and auxiliary switch of the inverter can complete the soft switching operation, and the voltage is not higher than the DC power supply voltage. The equivalent circuit diagram of an inverter under different working modes in switching cycle is given, the working process of the inverter is described in detail, the realization condition of soft switch is given, and the mathematical model of auxiliary circuit loss is established. The influence of resonance parameters on the loss of auxiliary circuit is discussed. Finally, a 4 kW single-phase experimental prototype is fabricated. The experimental results show that the switching devices in the inverter work under the condition of soft switching. The active resonant pole soft switching inverter can effectively improve efficiency and reduce switching loss.
【作者单位】：辽宁石油化工大学信息与控制工程学院;
【基金】：国家自然科学基金(51207069) 辽宁省自然科学基金指导计划项目(20170540586) 辽宁石油化工大学国家级科研项目培育基金(2016PY-016)
【分类号】：TM464

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