检索结果-南通市图书馆

Design and modulation principles of molybdenum carbide-based materials for green hydrogen evolution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第9期29卷 398-423,I0012页

作者： Jing-Qi Chi Min Yang Yong-Ming Chai Zhi Yang Lei Wang Bin Dong State Key Laboratory of Heavy Oil Processing College of ScienceChina University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Thin Film and Microfabrication(Ministry of Education) Department of Micro/Nano ElectronicsSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina

The green production of hydrogen from electrocatalytic water splitting is an important base and promising direction for the future of the large-scale application of hydrogen *** key of green hydrogen evolution depends on the development of low-cost and highly active *** carbides(MoxC),as a typical of earth-abundant transition-metal material,have accumulated great attention due to their low cost,earth abundance,electrical conductivity,similar d-band state to Pt,and regulated morphology/electronic *** this paper,recent researches focusing on MoxC for efficient HER in a wide pH range are summarized from respects of modulation of unique morphology,electronic structure,and electrode interface step by ***,modulation of morphology influence the apparent activity of catalyst,modulation of electronic structure of active sites by heteroatom doping and designing heterointerface boost intrinsic HER kinetics,and modulation of electrode interface via hybridization of MoxC structures with carbon materials can ensure the fast electron transfer and boost the *** the above methods discussed,perspective and challenges of designing MoxC as the substitute of Pt-based electrocatalyst for practical hydrogen generation in a wide pH range are pointed out.

关键词： Molybdenum carbides Classification Electrocatalyst modulation strategy Hydrogen evolution

Generalized Switched-Capacitor Step-up Multilevel Inverter Employing Single DC Source

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2022年第2期8卷 439-451页

作者： Yaoqiang Wang Kaige Wang Gen Li Fengjiang Wu Kewen Wang Jun Liang the School of Electrical Engineering Zhengzhou UniversityZhengzhou 450001China the Henan Engineering Research Center of Power Electronics and Energy Systems Zhengzhou 450001China Zhengzhou University Zhengzhou 450001China Zhoukou Power Supply Company State Grid Henan Electric Power Co.Ltd.Zhoukou 466000China Cardiff University Cardiff CF243AAU.K the Department of Electrical Engineering Harbin Institute of TechnologyHarbin 150001China

In this paper,a new generalized step-up multilevel DC-AC converter is proposed,which is suitable for applications with low-voltage input sources,such as photovoltaic power generation and electric *** inverter can achieve a high voltage gain by controlling the series-parallel conversion of the DC power supply and *** one DC voltage source and a few power devices are *** maximum output voltage and the number of output levels can be further increased through the switched-capacitor unit’s extension and the submodule cascaded ***,the capacitor voltages are self-balanced without complicated voltage control *** complementary operating mechanism between each pair of switches simplifies the modulation *** inductiveload ability is fully taken into account in the proposed ***,a remarkable characteristic of the inverter is that the charging and discharging states among different capacitors are synchronous,which reduces the voltage ripple of the frontend *** circuit structure,the working principle,the modulation strategy,the capacitors and losses analysis are presented in ***,the advantages of the proposed inverter are analyzed by comparing with other recently proposed ***,the steady-state and dynamic performance of the proposed inverter is verified and validated by simulation and experiment.

关键词： modulation strategy multilevel inverter single DC source switched capacitor voltage self-balancing

Review of Low Carrier Ratio Converter System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2021年第1期7卷 79-93页

作者： Mai Xu Yang Zhang Da Luo Anping Shen College of Electrical Engineering Hunan University of TechnologyZhuzhou 412007China

With the rapid development of new energy power generation and high-power traction technology,the voltage and power levels of converter devices have been continuously improved,and the application of high-power converters is becoming increasingly ***,high-power converters are affected by switching losses and heat dissipation,meaning they are not suitable for high carrier ***,research of low carrier ratio converter systems has received increased *** on existing research,the problems of large current harmonics,low observation accuracy,and poor stability that may occur at low carrier ratios are *** addition,the topologies,modulation strategies,and control methods of the low carrier ratio converter system are analyzed and ***,future research directions of low carrier ratio converter systems are proposed.

关键词： Converter low carrier ratio modulation strategy control method

The new and precise control base on Z-source inverter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The new and precise control base on Z-source inverter

Fault Tolerant Control of Multiphase Multilevel Motor Drives-Technical Review

第25届中国控制与决策会议

作者： Cunlu Dang Hu Liu Xiaoying Zhang Lanzhou University of Technology Key Laboratory of Gansu Advanced Control for Industrial Process

ISBN: (纸本)9781467355322

This article in-depth analyzes the control character of the Z-source inverter in photovoltaic power generation system. According to these problems of the dynamic performance of the Z-source inverter output and boosting controlling strategy lead to double switched frequency etc. A new improved boosting modulation strategy is presented. Based on SVPWM, changing turning on or off time of the same bridge switches to insert 6 shoot-through states in the single-cycle of traditional zero vector. Compared with the conventional boosting modulation strategy, the modulation is not only to stabilize the output performance of Z source inverter in a certain extent, and can effectively reduce the switching frequency. In addition, According to inaccurate problem of inserting the shoot-through time for traditional modulation strategy, this article presents the strategy to control accurately the shoot-through time through the slope of the modulation signal, to make Z -source inverter more controllable. These advantages of improved precision boosting modulation strategy are verified by simulation and experiment .

关键词： Z-source inverter modulation strategy Traditional zero vector Shoot-through states Switching frequency

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2017年第2期3卷 76-86页

作者： Zheng Wang Xueqing Wang Yibo Wang Jian Chen Ming Cheng School of Electrical Engineering Southeast UniversityNanjing210096China

The multiphase multilevel motor drives are a promising solution for some high-power and high-reliability applications,since they have multiple power conversion routes,a large amount of redundant voltage vectors,higher equivalent switching frequencies and superior harmonic *** has great significance to exploit their remedial control strategies in depth to fully utilize their high fault tolerant *** paper will present an updated technical review of fault tolerant control schemes for multiphase multilevel motor *** on exemplification of the diode neutral-point-clamping three-level(DNPC-3L)inverters and T-type NPC three-level(TNPC-3L)inverters fed asymmetric six-phase PMSM drives,the study is taken for both phase-leg faults and switch ***,the discussion on multiple-switch faults,short-circuit switch faults and switch and leg hybrid faulty conditions are discussed in this paper.

关键词： Fault tolerant control multiphase multilevel drives modulation strategy phase-level faults switch-level faults

Investigation and Evaluation of Multilevel H-NPC Converter for Electrically Driven Trains

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2012年第6期6卷 932-939页

作者： Georgios Adamidis Nikolaos Alagialoglou Georgios Tsengenes Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi 67100 Greece

In this paper the operation of a three level H-bridge converter as well as its parallel operations is analyzed and simulated on the computer. Based on the simulation results the operating behavior between （a） a three level H-bridge neutral point clamped convener, （b） a three level back-to-back H-bridge neutral point clamped convener, （c） two three level H-bridge neutral point clamped converters parallel connected is being compared. From the simulation results it is obvious that in the first two cases the ripples, the distortion in primary and secondary winding currents, and the power factor are quite satisfactory and almost identical to each other. In the third case as compared with the first two, it is observed that current harmonics with higher amplitude appear in the primary winding of the transformer.

关键词： AC-DC single-phase converter modulation strategy three level H-NPC topologies grid connected converter.