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Topology of Super Uninterruptible Power Supply with Multiple Energy Sources
Keyan Shi,Haijin Li,Changsheng Hu,Dehong Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The dramatic loss caused by the power blackout in some industrial applications proposes the requirement for an extremely high reliability uninterruptible power supply (UPS). This paper introduces the concept of super uninterruptible power supply (Super UPS). Multiple energy sources are used to obtain a high reliability, long backup time, high surety UPS system. Classifications for energy sources, power conversion stage and power distribution bus line are established to simplify the power conversion architectures. A generic method to classify the architectures for multiple energy source system is presented. Then a system reliability evaluation method based on different architectures is used to analyze the characteristics of different types of topology. Redundant power conversion stage design to enhance the system reliability is discussed. Finally, a high reliability super UPS architecture is proposed.
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Design and Control of Bi-directional DC/DC converter for 30kW fuel cell power system
Xiao Li,Wenping Zhang,Haijin Li,Ren Xie,Dehong Xu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Fuel cell (FC) power system is considered as an alternative energy power generation system in the future. This paper studies the bidirectional DC/DC converter for a 30㎾ three-phase fuel cell power system. The FC power system is sensitive to load characteristics in stand-alone mode, because rapid change or unbalance of the three-phase load will endanger the safety and expectancy of fuel cell. The bidirectional DC/DC converter with energy storage component is used to provide the dynamic power to avoid fast changing in fuel cell output. In addition, it acts as DC bus capacitors to absorb the low frequency current ripple. Therefore, fuel cell is separated from the low frequency current ripple and large DC bus electrolytic capacitors can be eliminated. Through investigating topology of the bidirectional DC/DC converter, three-level bidirectional DC/DC converter (TLBD) is used for the 30㎾ fuel cell power system. The design and control of the TL-DB is described. TL-DB with its control strategy is verified by the experimental results.
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Xuehan Wang,Mingxuan Li,Liwei Liu,Rui Mou,Xiuming Zhang,Yanling Bai,Haijin Xu,Mingqiang Qiao 한국미생물학회 2012 The journal of microbiology Vol.50 No.6
A Pseudomonas aeruginosa mutant strain M122 was isolated from a Mu transposon insertion mutant library. In our prophase research, we have found that PA0058, a novel gene encodes a 234-residue conserved protein, was disrupted in the M122 mutant. In this study, the bacteriostatic experiment in vitro indicates that M122 has abnormally high aminoglycoside resistance. We expressed PA0058 in E. coli and found that PA0058 oxidizes and reduces disulfide. This biochemical characterization suggests that PA0058 is a novel disulfide oxidoreductase. Hence, the protein was designated as DsbM. Microarray analysis of the M122 mutant showed its unusual phenotype might be related to the bacterial antioxidant defense system mediated by the oxyR regulon. Meanwhile, we detected –SH content in the periplasm of M122 and wild strain and found a lower –SH/S–S ratio in M122. Therefore, we consider that the loss of dsbM function decreased the –SH/S–S ratio, which then prolongs the OxyR-regulated response, thereby conferring high aminoglycoside resistance to the M122 mutant strain. Our findings have important implications for understanding the mechanisms underlying aminoglycoside resistance in P. aeruginosa.
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