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Design and Analysis of DC-DC Converters for Photovoltaic Systems 光伏系统DC-DC变换器的设计与分析
Pub Date : 2019-06-05 DOI: 10.51983/ajes-2019.8.s1.2318
M. Anish John Paul
The solar energy conversion system is an alternative for conventional power generating system. The voltage which is available from solar array is variable and to obtain a stable voltage from solar panels, DC-DC converters are required for constant power production. A PV module is designed in MATLAB-SIMULlNK using the S-function builder and controlled current source. The proposed PV module enables us to obtain its P-V and I-V characteristics at different temperature and radiations. This paper presents the design and simulation of DC-DC converters. In this paper, Boost converter, cascaded Buck Boost and Cuk converter are modelled in MATLAB and their results are compare
太阳能转换系统是传统发电系统的一种替代方案。太阳能电池阵列提供的电压是可变的,为了从太阳能电池板获得稳定的电压,需要DC-DC转换器进行恒定的电力生产。在matlab - simulink中,利用s函数构建器和可控电流源,设计了一个光伏模块。所提出的光伏组件使我们能够获得其在不同温度和辐射下的P-V和I-V特性。本文介绍了DC-DC变换器的设计与仿真。本文在MATLAB中对升压变换器、级联Buck升压变换器和Cuk变换器进行了建模,并对其结果进行了比较
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引用次数: 0
Self-Directed Learning (SDL) In Higher Education: Practices and Issues 高等教育中的自主学习(SDL):实践与问题
Pub Date : 2019-05-11 DOI: 10.51983/ajes-2020.9.2.2555
Dilani Kanishka Abeyrathne, S. Ekanayake
SDL is considered to be a fundamental educational goal. However, higher education institutes are challenged when promoting SDL. Therefore, the present study aims to, explore existing practices of self-direct learning implemented in the Faculty and to identify problems of undergraduates when they are engaging with self-direct learning practices in the Faculty. The study reflects that most of the students are familiar with the term self-directed learning. They had experienced with self-direct learning activities of assignments, class presentations conducted by students, group work or group discussions, practical/laboratory classes, field visits/field work, quizzes, tutorial classes, independent research project, e- learning, independent learning, food processing plant, in-plant training/industrial training, viva and farmer training program. Students express different learning preferences. However, students struggle with some issues when they engage with SDL. The issues are mainly related to course curriculum, teaching process, students’ factors and lecturers’ issues.
SDL被认为是一个基本的教育目标。然而,高等教育机构在推进SDL的过程中也面临着挑战。因此,本研究旨在探索学院现有的自主学习实践,并找出本科生在参与学院自主学习实践时存在的问题。研究表明,大多数学生对自主学习这个词比较熟悉。他们经历了作业的自主学习活动,学生进行的课堂演讲,小组工作或小组讨论,实践/实验课,实地考察/实地工作,测验,辅导课,独立研究项目,电子学习,自主学习,食品加工厂,工厂内培训/工业培训,现场和农民培训计划。学生表现出不同的学习偏好。然而,学生们在参与SDL时遇到了一些问题。这些问题主要与课程设置、教学过程、学生因素和教师问题有关。
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引用次数: 0
Design and Implementation of IoT Energy Meter to Monitor Energy Flow at the Consumer End 物联网电能表的设计与实现,以监测消费者端的能量流
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2367
Dakka Obulesu
This paper presents a device that uses the evolving IoT technology to design and implement an internet-based energy meter. This meter, being cheap and easy-to-implement solution, enables consumers to monitor the daily usage of electric power easily. This work primarily concerns the energy-monitoring aspect of IoT, along with discussing other advantages of this meter, such as its ability to overcome human errors and reducing dependency on manual labor, besides reducing costs in energy consumption. The proposed design, which comprises a low-cost wireless network and protocol for smart energy along with a web application capable of automatically reading the unit and then sending the data automatically provides great advantages to users by allowing them to keep a track of their meter reading. This system will help users by allowing them to not only take steps to reduce power wastage but also bring down costs of consumption, along with minimizing the threat of power theft, which is incurs great losses to power companies. Experimental results of this study show that the proposed IoT meter works efficiently and has proven its potential in practical applications at substantially reduced costs.
本文介绍了一种利用不断发展的物联网技术来设计和实现基于互联网的电能表的设备。该电表价格便宜,易于实施,使消费者能够轻松监控日常用电情况。这项工作主要关注物联网的能源监测方面,同时讨论了该仪表的其他优势,例如克服人为错误和减少对体力劳动的依赖的能力,以及降低能源消耗成本。提出的设计包括一个低成本的无线网络和智能能源协议,以及一个能够自动读取单元然后自动发送数据的web应用程序,通过允许用户跟踪他们的电表读数,为用户提供了巨大的优势。该系统将帮助用户,使他们不仅可以采取措施减少电力浪费,还可以降低消费成本,同时最大限度地减少对电力公司造成巨大损失的窃电威胁。本研究的实验结果表明,所提出的物联网仪表工作效率高,并证明了其在实际应用中的潜力,大大降低了成本。
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引用次数: 2
Improvement of Power System Loading Margin with Reducing Network Investment Cost Using SVC 用SVC降低电网投资成本提高电力系统负荷余量
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2363
K. Srikumar
Under emergency conditions to reduce the harms from environmental deterioration, one of the recently focused developments in the power industry is to make the existing transmission networks sufficiently utilize their capability in power transfer. From the detailed analysis and many studies, voltage instability was found to be the main factor responsible for several blackout events. As an index to indicate the level of static voltage stability of a transmission system, the Loading Margin (LM) or Voltage Stability Margin (VSM), represents the maximum power that can be transferred between generators and loads before voltage collapse point achieved is generally measured in system planning. In this paper, under each contingency with high Risk Index (RI) value, the Modal Analysis (MA) technique is used to determine which buses need Static VAR Compensator (SVC) installation, and with maximum LM and minimum SVC installation cost composed into the multi-objective function. The optimal LM enhancement problem is formulated as a multi-objective optimization problem (MOP) and solved by using the fitness sharing multi-objective particle swarm optimization (MOPSO) algorithm for a Pareto front set. The proposed method may be tested on the IEEE 24-bus reliability test system (RTS) and IEEE 14-bus system.
在紧急情况下,为减少环境恶化带来的危害,如何充分利用现有输电网的输电能力是近年来电力工业的研究热点之一。从详细的分析和大量的研究中发现,电压不稳定是造成多次停电事件的主要因素。负荷裕度(LM)或电压稳定裕度(VSM)是衡量输电系统静态电压稳定水平的指标,通常在系统规划中测量,表示在达到电压崩溃点之前发电机和负载之间可传递的最大功率。本文利用模态分析(MA)技术,在各风险指数(RI)值较高的突发事件下,确定需要安装静态无功补偿器(SVC)的母线,并将最大LM和最小SVC安装成本组成多目标函数。将最优LM增强问题表述为多目标优化问题(MOP),采用Pareto前集适应度共享多目标粒子群优化(MOPSO)算法求解。该方法可在IEEE 24总线可靠性测试系统(RTS)和IEEE 14总线可靠性测试系统上进行测试。
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引用次数: 0
Theoretical Study on the Thermoelectric Properties of Porous Armchair Graphene Nanoribbons 多孔扶手椅石墨烯纳米带热电性能的理论研究
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2361
Navjotkaur
Thermoelectric properties of porous graphene nanoribbons (GNRs) have been explored for a range of pore dimensions in order to achieve a high performance one-dimensional nanoscale thermoelectric device. In this paper, study has been done to observe the effect of different nanoporous shapes and their associated positions on the thermoelectric properties of GNRs. The aim of this work is to study the effect of various circular, triangular, rectangular and rhombus shape dimensions so as to tune the pore to its optimal dimension that would enhance the overall thermoelectric efficiency. Further, the effect of passivation of pore edges has been studied for all shapes so as to observe its effect on thermoelectric performance. Also, the effect of temperature dependence on thermoelectric efficiency has been studied. Ballistic transport regime and semi empirical method using Huckel basis set is used to obtain the electrical properties while the tersoff potential is used for the phononic system.
为了实现高性能的一维纳米热电器件,研究了多孔石墨烯纳米带(GNRs)在一定孔径下的热电性能。本文研究了不同形状的纳米孔及其相关位置对纳米纳米管热电性能的影响。本工作的目的是研究各种圆形、三角形、矩形和菱形形状尺寸的影响,以便将孔调整到最佳尺寸,从而提高整体热电效率。进一步研究了不同形状孔边缘钝化的影响,观察其对热电性能的影响。此外,还研究了温度依赖性对热电效率的影响。利用弹道输运区和利用Huckel基集的半经验方法获得了该系统的电学性质,而对声子系统则采用了变软势。
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引用次数: 0
PSO Based Model Reference Adaptive PI Controller for a Conical Tank Level Process 基于粒子群算法的锥形罐液位过程模型参考自适应PI控制器
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2362
R. Raghuraman
Conical tanks are mostly used in various process industries, such as metallurgical industries, food processing industries, concrete mixing industries wastewater treatment industries etc. A conical tank is basically a nonlinear process as its area of cross section varies with respect to level. This paper describes the implementation of PSO based Model Reference Adaptive PI controller for a nonlinear Conical Tank Level System (CTLS). The mathematical model of CTLS is developed and PSO based Model Reference Adaptive (MRA) PI Controller is proposed for this level system. A result of proposed controller is compared with GA based MRA-PI, MRA-PI and conventional PI controllers to analyze the performance in terms of integral square error and Integral absolute error. The results proved that the superiority of proposed controller.
锥形罐多用于各种加工行业,如冶金行业、食品加工业、混凝土搅拌行业、废水处理行业等。锥形储罐的截面面积随水平面的变化,基本上是一个非线性过程。本文介绍了一种基于粒子群算法的模型参考自适应PI控制器在非线性锥形罐液位系统(CTLS)中的实现。建立了CTLS的数学模型,提出了基于粒子群算法的模型参考自适应(MRA) PI控制器。通过与基于遗传算法的MRA-PI、MRA-PI和传统PI控制器的比较,分析了该控制器在积分平方误差和积分绝对误差方面的性能。结果证明了所提控制器的优越性。
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引用次数: 0
A Theoretical Study on the Thermoelectric Properties of Porous Armchair Germanene Nanoribbons 多孔扶手椅型锗烯纳米带热电性能的理论研究
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2360
Varunpreet Kaur, Deep Kamal Kaur Randhawa
Since the limits of conventional sources of energy are rapidly approaching, the thermoelectric devices have attracted attention for their potential of power generation directly from waste heat. In this paper, thermoelectric properties of porous armchair Germanene nanoribbons (AGeNRs) have been explored for a range of pore dimensions in order to achieve a high performance two-dimensional nanoscale thermoelectric device. The work has been done to investigate the influence of different nanopore shapes and their associated positions on the thermoelectric performance so as to tune it to the optimum pore shape and position that would enhance the overall thermoelectric efficiency. Also, the effect of passivation of the pore edges on thermoelectric parameters for all shapes has been studied. Further, the influence of temperature dependence on figure of merit has been observed. Ballistic transport regime and semi-empirical method using Huckel basis set is used to obtain the electrical properties while the Brenner potential is used for the phononic properties.
由于传统能源的极限正在迅速逼近,热电装置因其直接利用废热发电的潜力而引起了人们的注意。为了实现高性能的二维纳米热电器件,本文研究了多孔扶手型锗纳米带(AGeNRs)在一定孔径下的热电性能。研究了不同的纳米孔形状及其相关位置对热电性能的影响,从而将其调整到最佳的孔形状和位置,从而提高整体热电效率。此外,还研究了钝化孔边对各种形状的热电参数的影响。此外,还观察了温度依赖性对品质系数的影响。利用弹道输运区和Huckel基集的半经验方法获得电学性质,利用Brenner势获得声子性质。
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引用次数: 0
Application of K-Means Clustering for Designing Power Distribution Network k均值聚类在配电网设计中的应用
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2365
Shilpa Bansal
Installation of independent power distribution network with central generation using solar power plant is a trending solution to meet the demands of electricity of energy starved rural areas. In this paper, application of K-means clustering is proposed for designing power distribution network which segregates the houses in suitable number of clusters and all the clusters centroids are connected to the central location of solar power plant. Total number of clusters is selected by application of three methods like Elbow method, CH index method and Average Silhouette method. This paper can act as a useful tool for planning and designing the distribution network while optimizing the distribution losses and installation cost of the network.
安装独立的配电网,利用太阳能电站集中发电,是满足能源紧缺的农村地区电力需求的一种趋势解决方案。本文提出了将k -均值聚类方法应用于配电网设计,将住宅划分为适当数量的簇,所有簇的质心都连接到太阳能电站的中心位置。采用肘部法、CH指数法和平均轮廓法三种方法选择聚类总数。本文可以为配电网的规划和设计提供有用的工具,同时优化配电网的损耗和安装成本。
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引用次数: 0
Performance Evaluation of Nonlinear PI Controller on the Laboratory Type Spherical Tank Process 非线性PI控制器在试验型球罐过程中的性能评价
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2364
T. Bhuvanendhiran
In this paper, the implementation of Nonlinear PI controller based on error square type is designed and adopted to control of level in a spherical tank process. By use of black box model the system is found as a First order plus Dead Time model (FOPDT). Then the controller tuning strategies has been adopted namely Direct synthesis (IMC), Skogestad (IMC PI), and Nonlinear PI (error square type) tuning. Among all the three controllers tuning the error square type based Nonlinear PI tuning method shows better control performance than the other two controller tuning in terms of performance indices like Integral Square Error (ISE), Integral Absolute Error (IAE) and Time domain specifications
本文设计了基于误差平方型的非线性PI控制器的实现,并将其应用于球罐过程中的液位控制。利用黑盒模型,得到系统为一阶加死时间模型(FOPDT)。然后采用了直接综合(IMC)、Skogestad (IMC PI)和非线性PI(误差平方型)整定策略。在三种控制器整定中,基于误差平方型的非线性PI整定方法在积分平方误差(ISE)、积分绝对误差(IAE)和时域规格等性能指标上都比其他两种控制器整定具有更好的控制性能
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引用次数: 0
Voltage Stability Enhancement by Coordination of SVC and TCSC Using Particle Swarm Optimization 基于粒子群优化的SVC和TCSC协同增强电压稳定性
Pub Date : 2019-05-05 DOI: 10.51983/ajes-2019.8.2.2366
Maulik C. Pandya
The Flexible AC Transmission System (FATCS) plays a vital role in power system performance enhancement. They attributes to accomplish faster and having answers for many issues in power system study. With regards to this, a particles warm optimization (PSO) algorithm is implemented so that to design the coordinated parameters of static VAR compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC). Transient stability of a power system is based on the generator relative rotor angles obtained from time domain simulations outputs. A self-sufficient model of IEEE fourteen bus systems has been given with full detail and voltage stability analysis is done by considering load changing at a bus. PSO applied here is built on searching the values of L and C of SVC, then one can achieve desired and fine coordination. PSO is available with few modification, as change in PSO range & number, difference in selection criteria technique, control technique etc, with due respect to normalize PSO. The results are compared and found that coordination of FACTS devices with each other promises the efficiency of the suggested method for revamping Power flows. When function of TCSC is impelled by some curb, adjustable SVC can supply additional support to upgrade the gross performance.
柔性交流输电系统(FATCS)在提高电力系统性能方面起着至关重要的作用。对于电力系统研究中存在的许多问题,它们都具有较快的完成速度和较好的解决方案。为此,采用粒子热优化算法设计静态无功补偿器(SVC)和晶闸管控制串联电容器(TCSC)的协调参数。电力系统的暂态稳定性基于时域仿真输出的发电机相对转子角。给出了IEEE 14总线系统的自给自足模型,并在考虑总线负载变化的情况下进行了电压稳定性分析。这里应用的粒子群算法是建立在搜索SVC的L和C值的基础上,从而实现理想的精细协调。PSO只需要很少的修改,如PSO范围和数量的变化,选择标准技术的差异,控制技术等,并适当地规范化PSO。通过对结果的比较,发现FACTS设备之间的相互协调保证了所提出的改造潮流方法的效率。当TCSC的功能受到一定约束时,可调SVC可以提供额外的支持来提升总体性能。
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引用次数: 0
期刊
Asian Journal of Electrical Sciences
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