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| 1 | Novel Modular Multilevel Converter Against DC Faults for HVDC Applications显示文摘In view of the DC fault current isolation deficiency for the conventional half-bridge sub-module(HBSM)based modular multilevel converter(MMC),this paper presents an improved MMC topology.Both quasi reverse blocking submodules(QRBSMs)and current limit modules(CLMs)are employed to improve the DC fault handling capability for HVDC applications.This paper analyzes such a new converter configuration and operation principles.Then the DC pole-to-pole short circuit fault is taken into consideration for further study,as well as the fault current blocking mechanism and quantitative relationship between system electrical stress and key parameters.To validate the feasibility of the proposed topology and fault protection theory,extensive simulation results are demonstrated.It is concluded that the QRB-MMC can effectively block the fault current under DC fault condition.In addition,CLMs play an important role in further accelerating fault current attenuation.Moreover,QRB-MMC employs the original control and modulation strategies under normal operation conditions;thus,it further reduces the complexity of industry design. | Xiaofeng Yang Yao Xue Bowei Chen Zhiqin Lin Trillion Q.Zheng Yan Li | 2017 | CSEE Journal of Power and Energy Systems2017，3，2： | 2 |
| 2 | The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis显示文摘 | N.E.Huang Z.Shen S.R.Long M.C.Wu H.H.Shih Q.Zheng N.C.Yen C.C.Tung H.H.Liu | | 0，，： | 1 |
| 3 | Network structured SnO2/ZnO heterojunction nanocatalyst with high photocatalytic activity显示文摘 | L.R.Zheng Y.H.Zheng C.Q.Chen Y.Y.Zhan X.Y.Lin Q.Zheng K.M.Wei J.F.Zhu | | 0，，： | 1 |
| 4 | An Accurate Common-Mode Current Prediction Method for Transformerless Photovoltaic Inverters Based on Graph Theory显示文摘The common-mode current is an important indicator with transformerless photovoltaic inverters.However,up to now,there is not an accurate method to predict common-mode current in the inverter design process,resulting from inappropriate device selection or exceeded the expected common-mode current.In order to solve this problem,this paper proposes an accurate common-mode current prediction method based on graph theory for transformerless photovoltaic inverters.In this paper,the mathematic model of the common-mode current is derived using graph theory analysis method in the full-bridge topology,and it is used to predict common-mode current.The validity and correctness of the proposed prediction method are validated by simulation and experiment.The oscillation frequency and amplitude can be predicted by the proposed common-mode prediction method,whereas the traditional common-mode analysis method cannot.This paper provides a novel way to predict and analyze common-mode current in the transformerless photovoltaic inverters. | Yangbin Zeng Hong Li Bo Zhang Zhichang Yang Trillion Q.Zheng | 2017 | Chinese Journal of Electrical Engineering2017，3，3： | 1 |
| 5 | Yield performances of japonica introgression lines selected for drought tolerance in a BC breeding programme显示文摘 | Y. X.He T. Q.Zheng X. B.Hao L. F.Wang Y. M.Gao Z. T.Hua H. Q.Zhai J. L.Xu Z. J.Xu L. H.Zhu Z. K.Li | 2010 | Plant Breeding2010，，2： | 1 |
| 6 | A novel direct reduction method to synthesize ordered Fe-Pt alloy nanoparticles显示文摘In this work, a direct green solid-phase reduction method for the fabrication of large yield of ordered phase Fe-Pt alloy nanoparticles was reported, in which inorganic salts were used as metal precursors and H_2-containing atmosphere was used as reducer. Utilizing this method, the composition and chemical ordered phase, such as L1_2-Fe_3 Pt, L1_2-FePt_3, and L1_0-FePt phases can be easily achieved by one step reaction. The synthesized nanoparticles have clean surface because no organic precursors, no organic solutions or organic surfactants/ligands were used. Their magnetic performance and the formation mechanism of Fe-Pt alloy nanoparticles were also investigated. This strategy can be applied to synthesize many other types of alloy nanoparticles with desired composition and necessary crystal structure, which can be used for a variety of practical applications, such as in magnetism and catalyst research fields. | Q.Zheng Z.R.Zhang J.Du L.L.Lin W.X.Xia J.Zhang B.R.Bian J.P.Liu | 2019 | Journal of Materials Science & Technology2019，35，4： | 1 |
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