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- 저자 : Guidong Zhang (검색결과 4 건)
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Guidong Zhang,Zexiang Chen,Samson S. Yu 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3
This paper gives a detailed theoretical analysis of two popular non-electrolytic capacitor NEC–Z-source converters (NEC– ZSCs) including analyses of their operation, the voltage stresses of the capacitors and diodes, the current stresses of the inductors, the voltage and current stresses of the switches, and the voltage gain with and without considering parasitic parameters. Parameter design and small signal modeling of NEC–ZSCs are conducted, and a proportional–integral (PI) controller is designed to form the closed-loop control circuit. Simulations and experiments are conducted and their results are collected and analyzed. These results corroborate the feasibility and effectiveness of the theoretical analysis for the two NEC–ZSCs and the closed-loop control design.
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4-kW 3-phase rectifier with high efficiency and wide operational range via 3-mode SVPWM
Lin, Jiaqing,Li, Zhizhong,Zhang, Bo,Zhang, Guidong,Qiu, Wei The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
There are 6 modes in the full working state of a traditional 3-phase rectifier, and each mode is necessary for power factor correcting and for realizing the corresponding DC-link voltage. It is obvious that too many modes in the full working state increase the switch stresses, which results in high switching loss and increased economic cost. Reducing the number of working modes is a feasible solution to solve this problem. By improving the m-mode controllability in inverters, a 3-mode control strategy is derived for the traditional 3-phase rectifier to enhance its operational features. Note that the proposed control strategy can maintain a high-power factor above 0.99 and have higher efficiency when compared with the traditional control strategy. Finally, a lab-prototype with a load varying from 800 W to 4 kW is conducted to validate the feasibility of the proposed control strategy. Experimental results show that all of the tested cases have a 0.99 power factor and that highest efficiency of 96.7%. The results also reveal that the proposed strategy is superior to the traditional one in laboratory conditions. In addition, the proposed method is generalized and can be extended to other rectifier topologies.
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Boost-type push-pull converter with reduced switches
Gu, Aiyu,Sun, Weijie,Zhang, Guidong,Chen, Sizhe,Wang, Yu,Yang, Ling,Zhang, Yun The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.3
This paper develops and analyses a boost-type push-pull converter with a reduced number of switches. The newly designed converter mainly consists of five diodes, two switches, two inductors, a transformer and two capacitors. By tuning the duty cycle and the transformer ratio, different voltage gains of the proposed converter can be obtained. It is notable for its electrical isolation characteristics. When compared with traditional step-up converters, the step-up module and converter module share the same switch. In addition, the control of the converter becomes easier to implement, and it has better stability and a reduced volume. It should be mentioned that the number of switches in the proposed converter is decreased but maintains the same voltage stress when compared to the traditional structure. The operating principle of proposed converter is demonstrated, which is followed by the design of the component parameters. To validate the feasibility of the proposed topology, an experimental prototype is constructed to verify its correctness and practicability of the proposed converter when compared with the conventional converter.
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Reducing higher alcohols by nitrogen compensation during fermentation of Chinese rice wine
Xianfeng Zhong,Ali Wang,Yubo Zhang,Ziying Wu,Bin Li,Hua Lou,Guidong Huang,Haixiang Wen 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.6
Excessive amount of higher alcohols in alcoholicbeverages causes unwell and side-effect for consumersalthough adequate consumption offers joy and pleasure. Therefore, reducing higher alcohols in alcoholic beveragesis necessary. We used nitrogen compensation to reducehigher alcohols with Chinese rice wine as an experimentalmodel. Higher alcohols including isobutyl alcohols, isoamylalcohols, and b-phenethyl alcohols were significantlydecreased by 19.27, 23.03 and 19.43%, respectively, when200 mg/L (NH4)2HPO4, 5% (w/v) yeast, and 11% wheatKoji were added to fermentation broth. Meanwhile,important quality parameters remained unchanged includingfree amino acids, organic acids, biogenic amines, andesters. The expression of glutamate dehydrogenase 1 gene(GDH1) and glutamine synthetase gene (GLN1) was significantlyenhanced, 26.9- and 1.9-folds respectively. Theseresults suggest that ammonium compensation could effectivelydecrease higher alcohols in Chinese rice wine byactivating glutamate dehydrogenase (GDH) pathway inammonium assimilation.
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