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两级式逆变器中前级直流变换器的控制方法

DOI: 10.13334/j.0258-8013.pcsee.2015.03.020, PP. 660-670

Keywords: 两级式逆变器,前级直流变换器,二次谐波电流,闭环输出阻抗,虚拟阻抗

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Abstract:

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1kVA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。

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