一种适用于光伏发电系统的新型两相交错并联Boost变换器

A novel two-phase interleaved boost converter applied in the photovoltaic power generation system

针对传统两相交错并联Boost变换器输出电压增益较低,开关器件的电压应力较高的缺陷,文章在传统两相交错并联Boost变换器的基础上增加了2个二极管和3个电容,并进行了结构上的改进。在此基础上分析了占空比D>0.5时的工作原理,结果表明,新拓扑具有传统拓扑输入电流纹波小的优点,并且在相同的占空比下,其输出电压增益为传统拓扑的4倍,同时开关管和二极管的电压应力也得到了明显减小。最后,通过Matlab/Simulink仿真验证了理论分析的正确性。

Aiming at the shortcomings of the traditional two-phase interleaved boost converter such as low output voltage gain and high voltage stress of its switches, a novel high-gain two-phase interleaved boost converter is proposed. Two diodes and three capacitors are added to convert the traditional topology into a new topology, and its structure is improved simultaneously. Then its operation principle is analyzed when the duty ratio D is greater than 0.5. The analysis results show that the new topology inherits the advantage of low input current ripple of the traditional topology, and its output voltage gain is four times of the original topology under same duty ratio, the voltage stresses of the switches and diodes have been reduced obviously. Finally, the simulation of Matlab/Simulink is carried out to verify the correctness of the theoretical analysis.