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Analysis and Verification of the Stability for PV Series-Connected Power Optimizer System
Yutai Fu,Jizhi Qi,Yonghao Li,Xinghua Zhang,Min Chen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Photovoltaic (PV) energy generation gets more and more attention in the last decades. Among many structures of PV system, series-connected power optimizer (SCPO) system is regarded as a promising one. However, the cross-coupling effect introduced by the series-connected structure cannot be avoided, which would weaken the stability of the system, resulting in failure of operation of the system. Therefore, it is significant to analysis the stability of the series-connected system and suppress the effect by improving the closed-loop control strategy and compensation design. In this paper, the small-signal ac model consisting of three optimizers is derived and the criterions of stability and compensation design are proposed. Computer simulation and hardware experiment are used to verify the validity of the proposed theories.
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Ma Qian,Li Hui,Liu Yu,Liu Mingle,Fu Xinghua,Chu Shushu,Li Hang,Guo Jia 한국물리학회 2021 Current Applied Physics Vol.21 No.-
Uniform flower-like α-Fe2O3 architectures with self-assembled core-shell nanorods are constructed and successfully prepared via the facile process. The concentration of Fe salt plays a great significance for morphological evolution from nanorods to self-assembled microflowers. Flower-like α-Fe2O3/ZnFe2O4 consisting of α-Fe2O3 core and ZnFe2O4 shell nanorods are derived from FeOOH/ZIF-8 precursors. The detailed studies reveal that the tunable growth of ZIF-8 nanoparticles on three-dimensional FeOOH microflowers at room temperature and the availble calcination regulation are responsible for the formation of core-shell Fe2O3/ZnFe2O4 composites. The highest response value of flower-like α-Fe2O3/ZnFe2O4 architectures to 100 ppm triethylamine (TEA) has been improved to 141 at 280 ◦C, which is calculated to be 6.2 times compared with flower-like α-Fe2O3 architectures (22.7). The enhanced gas-sensing mechanism of α-Fe2O3/ZnFe2O4 composites can be attributed to the typical microflowers structures, the large specific surface area, the effective heterojunctions between α-Fe2O3 core and ZnFe2O4 shell, and the improved electron transfer process.
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