Control system design and stability analysis for a three phase SiC-based Filter-less grid-connected PV inverter [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.3193 Electrical, magnetic, optical, communications, computer engineering; electronics, lighting
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2018
• Mô tả vật lý: Size: 6 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 256267
• Chủ đề: 1. 30 direct energy conversion; 2. Filter-less; 3. Grid-connected; 4. Inverter; 5. Mosfet; 6. Silicon carbide; 7. Stability

Tóm tắt

In this paper, a control system of a filter-less grid-connected SiC inverter is designed. Stability analysis has been researched with a focus on grid disturbance rejection. The analysis shows that the conventional control method with instantaneous grid voltage feedforward (IGVF) will significantly limit the bandwidth or stability margin of a filter-less grid-connected inverter, thus make the inverter sensitive to grid disturbance. Two proposed grid voltage feedforward control methods, which require little additional computation resources, are presented to suppress the grid voltage disturbance. The design methods of control parameters are derived. The effects of the proposed feedforward methods are also compared with that of conventional IGVF. Lastly, the grid-connected experimental results of a three phase SiC based filter-less PV inverter are provided to verify and compare the proposed control methods.