一种基于同步控制双输入高升压DC/DC变换器

A Dual Input High Step-up DC/DC Converter Based on Synchronous Control

目前,光伏并网系统中DC/DC变换器普遍存在升压能力不足、有源器件电压应力较高等问题。针对这类问题提出了一种基于同步控制双输入高升压DC/DC变换器,该变换器具有升压能力强、有源器件电压应力小的特点,其采用同步控制的方式降低了控制系统的设计难度,双输入的拓展也提高了变换器使用的广泛性。首先,分析所提变换器的工作原理;然后计算变换器有源器件和无源器件的电气参数,并进行参数设计;最后结合设计参数,搭建基于PSIM的变换器模型进行仿真,并搭建1台功率为400 W的实验样机,通过实验样机得到的所有波形均与仿真波形一致,验证了所提变换器的有效性。

At present,the DC/DC converters in the photovoltaic grid-connected systems generally have the disadvantages of low boost capability and high voltage stress of active devices in.To solve this problem,this paper proposes a dual input high voltage boost DC/DC converter based on synchronous control,which has the characteristics of high boost capability and low voltage stress of active devices.This converter adopts a mode of synchronous control to reduce the design difficulty of the control system,and the expansion of dual input to increase the universality.The paper firstly introduce the working principle of the proposed converter,and then calculates the electrical parameters of the active and passive components of the converter as well as designs the parameters.Finally,combining the design parameters,it establishes a converter model based on PSIM and a 400 W experimental prototype to verify the correctness of the converter.