两级式逆变器中前级直流变换器的控制方法

发布时间：2018-05-01 19:19

本文选题：两级式逆变器 + 前级直流变换器　；参考：《中国电机工程学报》2015年03期

【摘要】：兼顾二次谐波电流抑制和动态性能改善是两级式逆变器中前级直流变换器的基本控制目标。该文从阻抗的观点出发,指出使前级直流变换器的闭环输出阻抗在二倍输出电压频率处呈现高阻抗,而在非二倍输出电压频率处呈现低阻抗是实现此控制目标的基本方法。采用与前级直流变换器的输出阻抗串联虚拟阻抗,并同时与中间母线电容并联虚拟阻抗的方法,实现了所提出的基本方法,并以Buck类的前级直流变换器为例,给出实现虚拟串联阻抗和虚拟并联阻抗的控制框图。通过对该控制框图进行等效变换,可推导得到现有文献中已提出的二次谐波电流抑制方法。最后,研制一台1 k VA原理样机,并通过理论分析和实验验证对这些不同控制方法的二次谐波电流抑制效果及对系统动态性能的改善作用进行对比。实验结果证明了理论分析的正确性。
[Abstract]:Considering the second harmonic current suppression and dynamic performance improvement is the basic control goal of the front stage DC / DC converter in the two stage inverter. From the point of view of impedance, this paper points out that the closed-loop output impedance of the former DC / DC converter presents a high impedance at the double output voltage frequency, and the low impedance at the non-double output voltage frequency is the basic method to achieve this control objective. The proposed method is realized by using the method of series virtual impedance with the output impedance of the former DC / DC converter and parallel virtual impedance with the intermediate busbar capacitor, and taking the Buck class of the former DC / DC converter as an example. The control block diagram of virtual series impedance and virtual parallel impedance is given. By equivalent transformation of the control block diagram, the proposed second harmonic current suppression method in the existing literature can be derived. Finally, a 1kVA prototype is developed, and the effects of these different control methods on suppressing the second harmonic current and improving the dynamic performance of the system are compared by theoretical analysis and experiments. The experimental results show that the theoretical analysis is correct.
【作者单位】：航空电源航空科技重点实验室(南京航空航天大学);
【基金】：国家自然科学基金项目(50837003) 江苏省333高层次人才培养专项资助(BRA2012141) 中央高校基本科研业务费专项资金(YAH12012) 江苏省普通高校研究生科研创新计划项目(CXZZ13_0162)~~
【分类号】：TM46

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