A novel multicell DC-AC converter for applications in renewable energy systems
Tóm tắt
This paper presents a novel DC-AC converter for applications in the area of distributed energy generation systems, e.g., solar power systems, fuel-cell power systems in combination with supercapacitor or battery energy storage. The proposed converter is realized using an isolated multicell topology where the total AC output of the system is formed by series connection of several full-bridge converter stages. The DC links of the full bridges are supplied by individual DC-DC isolation stages which are arranged in parallel concerning the dc input of the. total system. Therefore, all switching cells of the proposed converter can be equipped with modern low-voltage high-current power MOSFETs, which results in an improved efficiency as compared to conventional isolated DC-AC converters. Furthermore, the cells are operated in an interleaved pulsewidth-modulation mode which, in connection with the low voltage level of each cell, significantly reduces the filtering effort on the AC output of the overall system. The paper describes the operating principle, analyzes the fundamental relationships which are relevant for component selection, and presents a specific circuit design. Finally, measurements taken from a 2-kW laboratory model are presented.
Từ khóa
#Renewable energy resources #Switching converters #Distributed power generation #Power generation #Solar power generation #Solar energy #Power systems #Supercapacitors #Batteries #Energy storageTài liệu tham khảo
10.1109/63.712325
rufer, 1999, asymmetric multilevel converter for high resolution voltage phasor generation, Proc 8th Eur Conf Power Electronics and Applications (EPE)
10.1109/28.740843
10.1109/28.536875
10.1109/28.793373
10.1109/PESS.2000.867569
10.1109/63.4347
10.1007/978-94-011-2350-1
10.1109/TIE.2002.801056
10.1109/63.761689
10.1109/TIA.1983.4504190
10.1109/63.41765
10.1109/APEC.1995.469062
10.1109/IECON.1993.338994
10.1109/TIA.1985.349522
mohan, 1995, Power Electronics
nayar, 2001, power electronics for renewable energy sources, Power Electronics Handbook
rufer, 1996, a direct coupled 4-quadrant multilevel converter for 16 2/3 hz traction systems, Proceedings of 6th International Conference on Power Electronics and Variable Speed Drives, 448, 10.1049/cp:19960956