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Exploratory study of betavoltaic battery using ZnO as the energy converting material

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Nuclear Science and Techniques 2019年第4期30卷 62-69页

作者： Xiao-Yi Li Jing-Bin Lu Yu-Min Liu Xu Xu Rui He Ren-Zhou Zheng College of Physics Jilin University

Third-generation-semiconductor zinc oxide is utilized as an energy converting material in a betavoltaic battery, where 0.06 Ci^(63) Ni and 8 Ci^(147) Pm are used as the beta sources. Based on a Monte Carlo simulation, the full scales of the devices are derived as 17 and 118 lm,respectively, for both sources. The influences of semiconductor doping concentrations on the electrical properties of the devices are analyzed. For a typical doping concentration N_A= 10^(17) cm^(-3), N_D= 10^(16) cm^(-3), the conversion efficiencies are 7.177% and 1.658%, respectively, using63 Ni and147 Pm sources. The calculation results of energy deposition in materials for the two sources show that the doping concentrations drop to 1 × 10^(13)–5×10^(14) cm^(-3) and 1 × 10^(12)–5×10^(13), and accordingly, the energy conversion efficiencies rise to 14.212% and 18.359%, respectively.

关键词： Radioisotope Beta voltaic effect Zinc oxide Nuclear battery Monte Carlo simulation

Power Quality Issues Concerning Photovoltaic Generation and Electrical Vehicle Loads in Distribution Grids

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Smart Grid and Renewable Energy 2015年第6期6卷 164-177页

作者： Jaan Niitsoo Paul Taklaja Ivo Palu Joni Klüss Department of Electrical Power Engineering Tallinn University of Technology Tallinn Estonia Department of Electrical Engineering and Automation Aalto University Helsinki Finland

The high utilization level of renewable generation including residential photovoltaic (PV) systems together with the uncontrolled charging of electric vehicles (EVs) can have a significant impact on load characteristics in distribution networks. Harmonic content of PV generation, EV charging loads, and their influence on power quality indicators in residential distribution networks are discussed in this paper. For investigating likely power quality scenarios, PV generation and EV charging measurement results including current harmonic amplitude and phase angle values are used and compared with present load characteristics. Different modelling scenarios are analysed and a simplified model of harmonics in PVs and EVs is offered. The results of the study show moderate additional harmonic distortion in residential load current and voltage distortion at the substation’s busbar when PV generation and EV loading are added. The scenarios presented in this paper can be further used for modelling the actual harmonic loads of the PVs and EVs in distribution networks.

关键词： Current Measurement Distributed Generation Electric Vehicles Load Modelling Photo voltaic Power Quality Power System Harmonics

Power Quality Issues Concerning Photovoltaic Generation in Distribution Grids

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Smart Grid and Renewable Energy 2015年第6期6卷 148-163页

作者： Jaan Niitsoo Marek Jarkovoi Paul Taklaja Joni Klüss Ivo Palu Department of Electrical Power Engineering Tallinn University of Technology Tallinn Estonia Department of Electrical Engineering Tallinn University of Technology Tallinn Estonia Department of Electrical Engineering and Automation Aalto University Helsinki Finland

Unregulated utilization of renewable generation including residential photovoltaic (PV) systems can have a significant impact on load characteristics in distribution networks. For improving PV generation capabilities, power quality aspects have to be coordinated with present load characteristics. This paper discusses the harmonic content of PV generation and the influence to power quality indicators in residential distribution networks. PV generation measurement results including current harmonic amplitude and phase angle values are presented. Results of different modelling scenarios are analysed and a simplified model of harmonics in PVs is offered. The results of the study showed a moderate additional harmonic distortion in residential load current and voltage distortion at the substation’s busbar when PVs were added. Novelty of the paper is that harmonic current values at higher orders are presented and analysed. The results pointed out in this paper could be further used for modelling the actual harmonic loads of the PVs in distribution networks.

关键词： Current Measurement Load Modelling Photo voltaic Power Quality Power System Harmonics

A Pathway to Explore the Hidden Specialty in the Design of Fifteen Level Inverter in Grid Connected PV System

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Computer Modeling in Engineering & Sciences 2018年第6期115卷 359-386页

作者： C.Gopinath M.Rajvikram Department of Electrical and Electronics Engineering Sri Venkateswara College of Engineering(Autonomous)SriperumbudurTamilnaduIndia

This research paper proposes a single phase fifteen level inverter for a grid connected PV *** proposed inverter is also called cascaded asymmetric multilevel *** adopting appropriate hybrid modulation technique improved output voltage is obtained with minimum number of power electronic *** reducing the number of gate triggering circuits of the switches,the size and power consumption of the driving circuits can be *** total harmonic distortion of the output of the inverter is improved by this *** proposed inverter developed by cascading a full bridge inverter with modified H bridge multilevel *** validity of the proposed system is verified through MATLAB simulations.

关键词： Hybrid modulation multilevel inverter photo voltaic system grid connected inverter

THD Analysis of Cascaded H-Bridge Inverter with Fuzzy Logic Controller

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Circuits and Systems 2017年第7期8卷 171-183页

作者： Sivakumar N. Sumathi A. Department of EEE Jayalakshmi Institute of Technology Thoppur India Department of ECE Adhiyamaan College of Engineering Hosur India

In recent days, the multilevel inverter technology is widely applied to domestic and industrial applications for medium voltage conversion. But, the power quality issues of the multilevel inverter limit the usage of much sensitive equipment like medical instruments. The lower distortion level of the output voltage and current can generate a quality sinusoidal output voltage in inverters and they can be used for many applications. The harmonics can cause major problems in equipments due to the nonlinear loads connected with the power system. So, it is necessary to minimize the losses to raise its overall efficiency. In this paper, a new topology of seven level asymmetrical cascaded H-bridge multilevel inverter with a Fuzzy logic controller had been implemented to reduce the Total Harmonic Distortion (THD) and to improve the overall performance of the inverter. The proposed model is well suited for use with a solar PV application. In this topology, only six IGBT switches are used with three different voltage ratings of PV modules (1:2:4). The lower number of semiconductor switches leads to minimizing overall di/dt ratings and voltage stress on each switches and switching losses. The gate pulses generated by Sinusoidal Pulse Width Modulation (SPWM) technique with a Fuzzy logic controller are also introduced. A buck-boost converter is used to maintain the constant PV voltage level integrated by an MPPT technique followed by Perturb and Observer algorithm is also implemented. The MPPT is used to harness the maximum power of solar radiations under its various climatic conditions. The new topology is evaluated by a Matlab/Simulink model and compared with a hardware model. The results proved that the THD achieved by this topology is 1.66% and realized that it meets the IEEE harmonic standards.

关键词： Cascaded H-Bridge Multilevel Inverter THD Photo voltaic Modules SPWM Fuzzy Logic Controller MPPT Technique

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What I Want

成功营销 2008年第1期 116-116页

在世界领域里，我们询问了很多行业的商业领袖他们最想要什么，得到的反馈五花八门，既有U盘，也有电子宠物的答案，令很多人感到意外。今后我们还会做商业领袖“最有感慨的产品”系列，如果你恰好中意一款产品，就说出你的感受吧。

关键词：商业领袖 U盘电子宠物高尔夫球互动击打装置 voltaic Solar背包太阳能电池板万能插头