scholarly journals Wind driven semiconductor electricity generator with high direct current output based on a dynamic Schottky junction

RSC Advances ◽  
2021 ◽  
Vol 11 (31) ◽  
pp. 19106-19112
Author(s):  
Xutao Yu ◽  
Haonan Zheng ◽  
Yanghua Lu ◽  
Runjiang Shen ◽  
Yanfei Yan ◽  
...  
Keyword(s):  
Wind Energy ◽  
Direct Current ◽  
Schottky Junction ◽  
Current Output

In this study, a generator based on a metal/semiconductor dynamic Schottky junction has achieved ultrahigh and continuous direct current output by harvesting wind energy.

Study of the current waveform effect on the formation of cathode deposits during direct electrolysis Part 1. Electrolysis of fresh water

2021 ◽  
pp. 18-25
Author(s):  
И.В. Пчельников ◽  
Т.Т.З. Нгуен ◽  
Л.Н. Фесенко
Keyword(s):  
Fresh Water ◽  
Sodium Hypochlorite ◽  
Direct Current ◽  
Water Oxidation ◽  
Tap Water ◽  
Reverse Current ◽  
Raw Material ◽  
Half Cycle ◽  
Current Output ◽  
Direct Electrolysis

При электрохимической обработке хлоридсодержащих природных вод в бездиафрагменном электролизере образуются соли хлорноватистой кислоты, проявляющие окислительные свойства. Этот процесс широко используется для производства дезинфицирующих растворов на основе гипохлорита натрия. Сырьем для производства гипохлорита натрия могут быть не только искусственно приготовленные солевые растворы, но и природные минеральные воды, содержащие хлориды. Электролиз таких растворов приводит к образованию на катоде электролизера нерастворимых солей кальция и магния, что препятствует массообмену в межэлектродном пространстве, а также к возникновению аварийных ситуаций. В первой части статьи приведены результаты исследований прямого электролиза постоянным и реверсным током пресной воды г. Донгхой, Республика Вьетнам. В проведенных испытаниях определяли влияние реверсного тока в сравнении с постоянным током на снижение образования нерастворимых веществ на катодах электролизера. Эксперименты показали преимущество реверсного тока над постоянным. Так, при электролизе реверсным током продолжительностью периода до 6 часов масса отложений на электродах не увеличивалась, а на постоянном токе накапливалась с момента начала электролиза. Это связано с тем, что осадок, образующийся в катодный полупериод, растворяется в анодный полупериод кислотой – продуктом окисления воды. Выход хлора по току для водопроводной воды составил не более 23% с плотностью тока 100 А/м2. During the electrochemical processing of chloride-containing natural water in a membraneless electrolyzer, salts of hypochlorous acid are formed that are exhibiting oxidizing properties. This process is widely used for the production of sodium hypochlorite disinfectants. The raw material for the production of sodium hypochlorite can be not only artificially prepared saline solutions, but also natural mineral water containing chlorides. The electrolysis of such solutions results in the formation of insoluble calcium and magnesium salts at the cathode of the electrolyzer thus inhibiting mass transfer in the interelectrode space and the occurrence of emergency situations. The first part of the article presents the results of studies of direct electrolysis of fresh water with constant and reverse current in Dong Hoi city, Republic of Vietnam. In the conducted tests the effect of reverse current in comparison with direct current on the reduction of the formation of insoluble substances at the cathodes of the electrolyzer was determined. The experiments have shown the advantage of reverse current over direct current. So, during the electrolysis with reverse current for a period of up to 6 hours, the amount of deposits on the electrodes did not increase, however, with direct current the deposits accumulated from the very beginning of the electrolysis process. This is due to the fact that the precipitate formed during the cathodic half cycle is dissolved during the anodic half cycle by acid, a product of water oxidation. The current output of chlorine for tap water was no more than 23% with a current density of 100 A/m2.

Schottky direct-current energy harvesters with large current output density

Nano Energy ◽  
2019 ◽  
Vol 62 ◽  
pp. 171-180 ◽  
Author(s):  
Hao Shao ◽  
Jian Fang ◽  
Hongxia Wang ◽  
Haitao Niu ◽  
Hua Zhou ◽  
...  
Keyword(s):  
Direct Current ◽  
Current Output ◽  
Energy Harvesters ◽  
Large Current ◽  
Current Energy

Self-Powered Direct-current Type Pressure Sensor by Polypyrrole/Metal Schottky Junction

2021 ◽  
Author(s):  
Shu Ying ◽  
Jia-Han ZHANG ◽  
Ke Yan ◽  
Ming Xin ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Direct Current ◽  
Pressure Sensor ◽  
Schottky Junction ◽  
Self Powered ◽  
Type Pressure

Current output hard‐switched full‐bridge DC/DC converter for wind energy conversion systems

2014 ◽  
Vol 8 (7) ◽  
pp. 749-756 ◽  
Author(s):  
Shixiong Fan ◽  
Tianjiao Pu ◽  
Guangyi Liu ◽  
Weiwei Ma ◽  
Lixin Li ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Current Output ◽  
Wind Energy Conversion ◽  
Wind Energy Conversion Systems ◽  
Energy Conversion Systems

Versatile origami micro-supercapacitors array as a wind energy harvester

2018 ◽  
Vol 6 (40) ◽  
pp. 19750-19756 ◽  
Author(s):  
Chang Gao ◽  
Jian Gao ◽  
Changxiang Shao ◽  
Yukun Xiao ◽  
Yang Zhao ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Harvester ◽  
Current Output

The voltage and current output of the polypyrrole/graphene-based micro-supercapacitors (PPyG-MSCs) array on paper can be well-regulated by directly folding the paper, and the PPyG-MSCs are also easily assembled onto the wind energy appliance by pressing the electrodes onto the leaves of the windmill to utilize and store the wind energy.

Rationally Segmented Triboelectric Nanogenerator with Constant Direct-Current Output and Low Crest Factor

2021 ◽  
Author(s):  
Pengfei Chen ◽  
Jie An ◽  
Renwei Cheng ◽  
Sheng Shu ◽  
Andy Berbille ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Direct Current ◽  
Triboelectric Nanogenerator ◽  
Crest Factor ◽  
Current Output ◽  
Practical Applications ◽  
Triboelectric Nanogenerators

Despite great potential of triboelectric nanogenerators (TENGs) as a promising energy harvesting technology, their practical applications are still hindered by their pulsed outputs with high crest factor. Here, through a...

scholarly journals THD Reduction in Wind Energy System Using Type-4 Wind Turbine/PMSG Applying the Active Front-End Converter Parallel Operation

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2458 ◽  
Author(s):  
Nadia Maria Salgado-Herrera ◽  
David Campos-Gaona ◽  
Olimpo Anaya-Lara ◽  
Aurelio Medina-Rios ◽  
Roberto Tapia-Sánchez ◽  
...  
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Output Power ◽  
Energy System ◽  
Fourier Series Expansion ◽  
Total Output ◽  
Current Output ◽  
Front End ◽  
Wind Energy System ◽  
Converter Topology

In this paper, the active front-end (AFE) converter topology for the total harmonic distortion (THD) reduction in a wind energy system (WES) is used. A higher THD results in serious pulsations in the wind turbine (WT) output power and several power losses at the WES. The AFE converter topology improves the capability, efficiency, and reliability in the energy conversion devices; by modifying a conventional back-to-back converter, from using a single voltage source converter (VSC) to use pVSC connected in parallel, the AFE converter is generated. The THD reduction is achieved by applying a different phase shift angle at the carrier of digital sinusoidal pulse width modulation (DSPWM) switching signals of each VSC. To verify the functionality of the proposed methodology, the WES simulation in Matlab-Simulink® (Matlab r2015b, Mathworks, Natick, MA, USA) is analyzed, and the experimental laboratory tests using the concept of rapid control prototyping (RCP) and the real-time simulator Opal-RT Technologies (Montreal, QC, Canada) is achieved. The obtained results show a type-4 WT with a total output power of 6 MVA, generating a THD reduction up to 5.5 times of the total WES current output by Fourier series expansion.

Maximum power point tracking control of wind energy conversion system driving a permanent magnet synchronous generator: Comparative study

2020 ◽  
pp. 0309524X2094438
Author(s):  
Omessaad Elbeji ◽  
Marwa Hannachi ◽  
Mouna Benhamed ◽  
Lassaad Sbita
Keyword(s):  
Wind Energy ◽  
Direct Current ◽  
Maximum Power Point Tracking ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Wind Energy Conversion System ◽  
Wind Energy Conversion ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

A wind energy conversion system needs a maximum power point tracking strategy. In the literature, several works have interested in the search for a maximum power point. Generally, their goals are to optimize the rotation speed or the machine torque and the direct current–direct current or the alternating current–direct current duty cycle switchers. This work presents a comparative study between two maximum power point tracking strategies of a wind energy conversion system. The model of the system is studied and developed. It includes a permanent magnet synchronous generator, a diode rectifier and a three-cell direct current–direct current converter. The direct current–direct current is controlled in order to generate the wind maximum power using the tip speed ratio strategy and optimal torque strategy. The effectiveness of the used strategies control scheme is proved by simulation results using MATLAB/Simulink.

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