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Power conditioning system of Flywheel Energy Storage
Zhongwei Chen,Xudong Zou,Shanxu Duan,Huarong Wei 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In a Flywheel Energy Storage system (FESS), the power conditioning system is the key component of controlling power transfer between the Flywheel and the power system. The dynamics of the power conditioning system directly affect the effect of FESS in dynamic regulation of power system. In this paper, power conditioning system which is made up of a doubly-fed induction machine (DFIM) connected with flywheel, a back-to-back converter for AC excitation and an excitation vector control system is studied. The excitation control strategy is presented for FESS DFIM to improve transient stability and increase transfer capability of power systems. The proposed control method has good dynamics that can respond to the system power demand quickly and accurately. Moreover, the proposed control method has good robust characteristic and applicability to improve the performance of power conditioning system. Simulation and experiment results are performed to evaluate the performance of the proposed control method.
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Mingle Wang,Jing Zhuang,Zhongwei Zou,Qinghui Li,Huahong Xin,Xinghui Li 한국식물학회 2017 Journal of Plant Biology Vol.60 No.5
Dehydration-responsive element-binding protein(DREB) transcription factors play key roles in plant stresssignal transduction pathways. We herein describe the functionsof a Camellia sinensis DREB transcription factor (CsDREB)in response to abiotic stress. Subcellular localization analysesindicated that the CsDREB localizes to the nucleus. CsDREBexpression in C. sinensis leaves was induced by heat, cold,drought, high salinity, H2O2, and exogenous abscisic acid(ABA). Additionally, CsDREB showed no transcriptionalactivation in Saccharomyces cerevisiae. Transgenic Arabidopsisthaliana plants overexpressing CsDREB exhibited enhancedtolerance to salt and drought stresses. The overexpression ofCsDREB in A. thaliana plants resulted in the up-regulatedexpression of ABA-dependent stress-induced genes (i.e.,AtRD29B, AtRAB18, AtABI1, and AtABI2) and ABAindependentstress-induced genes (i.e., AtCOR15a andAtRD29A). Furthermore, an analysis of the CsDREB promotersequence revealed the presence of several abiotic and bioticstress-related motifs, along with the developmental stageandtissue-specific elements. An examination of thetransient expression of the CsDREB promoter in Nicotianabenthamiana leaves revealed that the promoter is highlyresponsive to ABA and methyl jasmonate. Collectively, theseresults suggest that CsDREB may increase plant tolerance tosalt and drought stresses via both ABA-dependent and ABAindependentpathways.
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Baiquan Liu,Honglong Ning,Lei Wang,Jianhua Zou,Zhongwei Zhou,Miao Xu,Hong Tao,Dongyu Gao,Linfeng Lan,Junbiao Peng 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
An efficient single-emitting layer hybrid white organic light-emitting diode (WOLED) was developed,simultaneously fulfilling low efficiency roll-off, stable color and extreme luminance. At the practicalluminance of 1000 cd/m2, a total current efficiency of 42.8 cd/A and power efficiency of 19.2 lm/W areachieved, maintaining as high as 40.5 cd/A and 15.5 lm/W even at 5000 cd/m2. Besides, a slight colorvariation [(0.025, 0.011)] and extreme luminance ( 106 cd/m2) are obtained. The working mechanism isunveiled and it is demonstrated that the triplet-exciton-confining ability of electron transport layersplays a more vital role in device performances, particularly for the lifetime.
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