微型太阳能光伏发电系统的两种直流升压电路

Two Types of DC-DC Boost Circuit for Solar Photovoltaic Micro-Inverter System

微型太阳能光伏发电系统直流升压电路主要采用反激变换器和交错反激变换器两种电路,首先分析了两种升压电路的工作原理,推导出两种电路的输出电压增益,然后通过理论推导与实验分析比较这两种升压电路的优缺点,进而得出以下结论:反激变换器与交错反激式变换器具有相同的电压增益;交错反激变换器采用两级反激变换器交错输出的方式,可减小输入大容量电解电容的纹波电流的有效值,从而延长电容的寿命,减少了输出电流的纹波,从而降低输出电流的总谐波失真。

There are mainly two types of DC-DC boost circuit for solar photovoltaic micro-invener system,which are flyback convener and interleaved flyback convener.A t first,working principle of two types of DC-DC boost circuit is analyzed here,and output voltage gain of these circuit is inferred,and then the advantages and disadvantages of the two types of circuit are compared by mears of theoretical derivation and experimental analysis,and finally,it comes to the conclusion that：the output voltage gain of flyback converter and interleaved flyback converter is the same,By counterchanging output of two-stage flyback converters,the interleaved flyback convener reduces the effective value of the ripple current through the input bulk electrolytic capacitor,which increases the life of the capacitor,and the ripple of output current is reduced and then the total harmonic distortion is reduced.