适用于氢燃料电池的双Z源DC-DC高增益变换器研究OA

[Objective]In response to the insufficient boost capability and excessive device stress when conventional converters are applied to hydrogen fuel cell grid connection,a low electrical stress high-gain single-switch converter based on a dual Z-source network(LEHGSSC-DZ)is proposed.[Methods]This converter places the switching transistor in the quasi-Z source converter upfront to reduce device stress.Simultaneously,one of the inductor components is replaced with a quasi-Z source network,forming a dual-Z source network structure to enhance the converter's boost capability.The operating principle and output characteristics of the converter are analyzed,and a comprehensive comparison is made between the LEHGSSC-DZ and several other high-gain boost converters.Component parameter design is provided based on its output characteristics.The correctness of theoretical analysis and the feasibility of LEHGSSC-DZ are verified through simulations and experiments.[Results]The results demonstrate that the LEHGSSC-DZtopology employs fewer devices and offers superior cost-effectiveness.Compared to conventional Z-source boost converters,it achieves a 43.8%increase in output voltage,while delivering an output voltage that is 5.1 times higher than that of conventional boost converters.Furthermore,it reduces switching device voltage stress by 30%.[Conclusions]The proposed converter offers the distinct advantages of low electrical stress,high gain,and minimal device count,achieving a maximum efficiency of 97.25%.This contributes to enhancing the operational efficiency of hydrogen fuel cell grid-connected systems.