一种双输入降压型Cuk直流变换器参数设计与仿真分析

Parameter Design and Simulation Analysis of a Dual-input Step-down Cuk DC/DC Converter

针对传统的新能源联合发电系统在供电过程中存在电力供应不连续、不稳定等缺陷问题,设计了一种双输入降压型Cuk直流变换器,取替传统的由两个单路输入源直流变换器,输出并联到公共直流母线上的拓扑电路,实现电能高效变换和稳定输出特性功能.最后使用Saber软件对所设计的一种双输入降压型Cuk直流变换器拓扑电路进行仿真,从稳态特性、输出值吻合度和系统效率等方面进行实验分析,实验结果验证了本文理论分析的有效性和可靠性,为解决输出电流不连续、不稳定等问题拓展了思路,具有重要理论意义和工程实用价值.

In view of the traditional new energy combined generation system,there are some defects in the process of power supply,such as discontinuity and instability.In this paper,a dual-input step-down Cuk DC/DC converter is designed to replace the traditional topology of two single input DC converters connected in parallel to the common DC bus and realize the function of high efficiency transformation and stable output characteristic of electric energy.At the end of the paper,saber software is used to simulate the topology of a dual-input step-down Cuk DC/DC converter.Experimental analysis is carried out from the aspects of steadystate characteristics,output value coincidence and system efficiency.The experimental results verify the validity and reliability of the theoretical analysis,which solves the problems of output current discontinuity,instability and other bad problems.It has important theoretical significance and engineering practical value.