单相并网LCL型逆变器的改进设计方案

发布时间：2018-07-10 00:14

本文选题：单相并网LCL型逆变器 + 直流母线电压限制　；参考：《电工技术学报》2017年18期

【摘要】：随着越来越多的分布式能源接入电网,并网逆变器获得了更多的应用。并网逆变器能够成功实现并网运行的前提是其直流母线电压高于最小要求限值,这限制了并网逆变器的应用。为降低并网逆变器的应用门槛,提出一种单相并网LCL型逆变器的改进设计方案。该设计方案通过将LCL型滤波器设计成一个有一定升压增益的模块,降低了前端逆变桥的输出电压要求,进而能够降低并网逆变器的直流母线电压限制,扩大了单相并网逆变器在低功率场合下的应用。首先分析传统LCL型单相并网逆变器直流母线电压受限制的原因,然后基于一种改进LCL型滤波器设计思路,利用其电压增益功能,给出一种详细的单相并网LCL型逆变器的改进设计方案,最后通过仿真和实验验证了提出的设计方案的有效性。
[Abstract]:With more and more distributed energy connected to the grid, grid-connected inverters have gained more applications. The premise of grid-connected inverter is that the DC bus voltage is higher than the minimum limit, which limits the application of grid-connected inverter. In order to reduce the application threshold of grid-connected inverter, an improved design scheme of single-phase grid-connected LCL inverter is proposed. By designing the LCL filter into a module with certain boost gain, the output voltage requirement of the front-end inverter bridge is reduced, and the DC bus voltage limit of grid-connected inverter can be reduced. The application of single-phase grid-connected inverter in low power situation is expanded. This paper first analyzes the reason why the DC bus voltage of the traditional single-phase grid-connected inverter is limited, and then, based on an improved LCL filter design idea, makes use of its voltage gain function. An improved design scheme of single-phase grid-connected LCL inverter is presented. Finally, the effectiveness of the proposed scheme is verified by simulation and experiments.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);
【基金】：国家自然科学基金项目资助(51477021)
【分类号】：TM464

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