Research on parameter design and control method of L+LCL dual frequency single phase grid-connected inverter

被引：0
|
作者：
Yang L. [1 ]
Du K. [2 ]
Chang A. [2 ]
Liu S. [3 ]
机构：
[1] Inverter Technologies Engineering Research Center of Beijing, Beijing
[2] Collaborative Innovation Center of Key Power Energy-Saving Technologies in Beijing, Beijing
[3] Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 08期
关键词：
Current harmonic suppression; Electric inverter; Electric loss; Pulse width modulation; Switching frequency;
D O I：
10.19912/j.0254-0096.tynxb.2019-0535
中图分类号：
学科分类号：
摘要：
In order to reduce the switching losses of the grid-connected inverters and improve system efficiency and current quality, this paper proposes a L+LCL type dual-frequency single-phase grid-connected inverter topology, which integrates a low switching frequency inverter unit and a high switching frequency rectifying unit. The low frequency unit is responsible for transmitting electric energy to the power grid. and the high frequency unit uses the feedforward compensation method to generate the harmonic elimination current. By this way, it does not need to extract the switching harmonics to suppress the current harmonics of the low frequency unit. The high-frequency unit uses the LCL filter to further reduce the high-frequency switching harmonics in the grid-connected current and improve the grid-connected current quality. The working principle and parameter design method of the inverter is proposed. The experimental test is carried out by using the prototype. The results show that the grid-connected inverter can guarantee the current quality, has good steady-state performance and dynamic response, and verify the efficiency advantage of the dual-frequency grid-connected inverter. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
引用
收藏
页码：57 / 65
页数：8
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