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SPWM逆变器设计_电气工程论文范文_电气工程论文
电气工程论文 目录 摘要Ⅰ AbstractⅡ 1 前言1 1.1 现代逆变技术的发展与现状1 1.1.1现代逆变技术的概念1 1.1.2现代逆变技术的发展过程1 1.1.3现代逆变技术的分类2 1.2 选题的原因和设计内容2 1.2.1 SPWM的优点2 1.2.2本文研究的主要内容3 2 SPWM逆变整流的原理4 2.1 单相正弦波全桥逆变器的主电路拓扑4 2.2 开关管的驱动信号4 2.3 SPWM的两种常用的控制方法5 2.4两种波形形式6 2.5 设计中所用的SPWM7 3硬件部分介绍8 3.1总体设计方案8 3.1.1 硬件设计原理图8 3.1.2 系统功能介绍8 3.2 SPWM正弦信号发生器SA82828 3.1.1 SA8282引脚和内部结构9 3.1.2结构原理10 3.3 单片机805111 3.3.1单片机AT89C51性能12 3.3.2主要特性13 3.3.3管脚说明14 3.3.4振荡器特性15 3.3.5芯片擦除15 3.4 UNL2004驱动器15 3.4.1芯片ULN2004性能16 3.4.2ULN2004 特性16 3.5 光电隔离器17 3.5.1光电隔离器简介18 3.5.2光电隔离器的结构19 3.5.3光电隔离器的应用20 3.5.4光电隔离器构成的几个实用电路21 3.6 IR211024 3.6.1 IR2110简介24 3.6.2 IR2110内部结构和特点25 3.6.3高压侧悬浮驱动的自举原理25 3.7 LED的显示26 3.7.1并行接口概述27 3.7.3 74HC164简要说明29 4设计总结32 致谢32 参考文献34 附录 硬件系统电路原理图和PCB35 摘要 本文研究内容属于电源应用技术领域。随着电力电子技术的飞速发展和对电气设备控制性能要求的提高，逆变技术的应用越来越广泛，相应对逆变电源的要求也越来越高。正弦波逆变技术已成为电力电子技术中最重要的部分。 SPWM逆变器作为逆变器的一种，可输出谐波含量小的正弦波形。随着数字化控制技术的发展，SPWM脉冲波的生成和逆变器的全数字化控制趋于方便，并可使逆变器的输出波形的稳态精度、暂稳态响应、可靠性等得到进一步提高。此外，逆变器诸性能的改善还基于对波形的闭环反馈控制，已见应用于此领域的纯数字控制技术有重复控制、数字PID控制、滑模控制、单周控制等。 鉴于此，这次设计是采用SPWM逆变技术进行对电源的逆变，整个系统中用单片机控制，使逆变电源数字化，LED的显示使系统能直观化。数字化的逆变器让控制更加方便，并可使逆变器的输出波形的稳态精度、暂态响应、可靠性等得到进一步的提高。因为本次设计是对原有的实验设备基础上进行改进，精简了一部分元件的设计，加入了光电隔离技术，消除了外界电源的干扰，使得输出更加精确。 关键词：逆变电源；正弦脉宽调制；光电隔离；单片机8051；数码管显示 Abstract The content of this dissertation belongs in the research fields of power appliance technology. The performances of inventers are becoming more and more important along with the inverter technology’s widely using in lots of fields as the high speed developing of the power electronics and the more need for the electrical systems on control performance in some fields. As we know, the quality of electrical energy is more and more demanding in the modern industrial applications. As one of inventers, SPWM inventers can achieve low total harmonic distortion (THD) output wave. With the development of digital control techniques, the production of SPWM and digital control of inventers become convenient, which makes the output wave’s steady-state precision, transient and steady state response, reliability improved. In addition, performances’ improvements of the inventers are also based on closed-loop control of output wave. Pure digital control technique, such as repetitive control, digital PID control , sliding mode control and one-cycle control, have being used in these fields. In view of this, the design is the use of technology SPWM inverter power inverter, using single-chip microcomputer to control the entire system, so that the digital power inverter, LED display of the system can be intuitive. Digital control of the inverter to allow more convenient and steady state response, reliability improved. In addition, performances’ improvements of the inverters are also based on closed-loop control of output wave. Because of this design is the original on the basis of laboratory equipment to improve, streamline the design of a component part, joined the photoelectric isolation technology, eliminating the interference of external power, making the output more accurate. Keywords: inverter；SPWM；Optical isolation；8051； LED
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基于WinCC的采光控制系统人机界面设计_电气工程论文
电气工程论文 目 录 摘 要II 1 前 言1 2 总体方案设计2 2.1 研究的基本内容2 2.1.1设计背景2 2.1.2系统界面设计要求2 2.1.3研究的方法与技术路线:2 2.2 系统总体结构3 3 Wincc V6功能及通讯4 3.1 Wincc V6概述4 3.2 组态软件发展状况4 3.3 组态软件的功能特点发展方向5 3.4 WinCC与S7-300的通信6 4 人机界面设计9 4.1 人机界面设计要求9 4.2 人机界面设计步骤9 4.2.1启动WinCC9 4.2.2 建立一个新项目9 4.2.3 选择及安装通讯驱动程序10 4.2.4 定义变量11 4.2.5 建立和编辑过程画面12 4.2.6 指定WinCC运行系统的属性14 4.2.7 系统调试15 4.3 监控画面的介绍16 4.3.1 主画面16 4.3.2 过程画面19 4.3.3 归档画面23 4.3.4 报警画面25 5 系统的调试27 5.1 模拟调试27 5.2 实际调试27 6 总 结29 致 谢30 参考文献31 附 录1 界面设计中所用的C脚本32 附 录2 采光控制系统的PLC程序36 摘 要 WinCC是过程控制系统及其它西门子控制系统中的人机界面组件。WinCC是第一个使用最新的32位技术的过程监视系统，具有良好的开放性和灵活性。通用的应用程序，适合所有工业领域的解决方案；多语言支持，全球通用 ；可以集成到所有自动化解决方案内；内置所有操作和管理功能，可简单、有效地进行组态；可基于Web持续延展，采用开放性标准，集成简便；集成的Historian 系统作为IT 和商务集成的平台；可用选件和附加件进行扩展 ；“全集成自动化” 的组成部分，适用于所有工业和技术领域的解决方案。从面市伊始，用户就对西门子 WinCC印象深刻。 本设计结合西门子S7-300系列PLC和WinCC监控软件相结合的控制模式实现了采光系统的全自动监视与控制。并通过软硬件之间的配合与调试，从而达到实验设计的要求，实现采光的自动化控制。 本文主要详细讲述了采光控制系统上层设计。 关键词：采光控制系统、WinCC、S7-300 Abstract WinCC is the process control system and other Siemens control system components in human-machine interface. WinCC is the first use of the latest 32-bit technology, the process of surveillance systems, has a good openness and flexibility. Universal application, suitable for all industrial areas of the solution; multi-language support, global general; can be integrated into all programs within automation solution; built-in all the operations and management functions, can be simply and efficiently configuration; can be based on Web ongoing extended, using open standards, ease of integration; Integrated De Historian IT and business integration system Zuowei the platform; available options and additional pieces of Jinhangkuozhan; "Totally Integrated Automation" an integral part, applies to all industrial and technology solutions. From the market at the beginning, users of the Siemens WinCC impressive. The design combines the Siemens S7-300 series PLC and WinCC monitoring software combined control mode to achieve a fully automatic lighting system monitoring and control. And through and between the hardware and software debugging, so as to achieve the requirements of experimental design to achieve lighting automatic. In this paper, a detailed account of the upper lighting system design. Keywords：lighting automatic、WinCC、S7-300
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基于单片机的数字式频率计软件设计_电气工程论文范文
电气工程论文 目 录 摘要Ⅰ 1 前言1 1.1 数字频率计研究的意义与目的1 1.2 数字频率计的现状和发展前景1 1.3 数字频率计设计的工作内容3 2主要硬件简介4 2.1 AT89S51单片机4 2.2 触发器6 2.3 译码器6 3数字频率计硬件设计9 3.1 频率计的工作原理9 3.2频率计的系统级框图9 3.3数字频率计硬件设计原理9 3.3.1输入单元10 3.3.2 显示单元10 3.3.3 引脚图11 3.3.4 功能表11 3.4 系统总设计12 4 数字频率计软件系统设计14 4.1系统软件的设计的基本原理14 4.1.1 系统软件的设计的总原理及总框图14 4.1.2定时循环的程序设计框图15 4.1.3 进制转换17 4.1.4 数码显示19 4.1.5频率计系统总体程序25 4.２ 程序的调试25 4.３ 单片机仿真器简介27 5总结28 致谢29 参考文献30 附录 系统总程序31 摘 要 数字频率计是计算机、通讯设备、音频视频等科研生产领域不可缺少的测量仪器，其基本功能是测量正弦信号、方波信号及其他各种周期信号的频率及周期参数，并采用十进制数字显示被测量参数，具有测量迅速、精度较高、显示直观等优点。本文基于单片微处理器及其外围电路，设计制作一个频率测量系统，主要研究程序设计实现方法。设计思想采用定时、计数的方法实现对周期信号的频率测量，然后通过进制转换并运用LED显示器动态显示４位频率参数，其测量范围为1Hz-10kHz。程序采用汇编语言，主要通过伟褔编译器编写。实际运行表明，所设计的系统运行正常，结果正确。同时，通过对输入信号的波形整形可实现对各种周期性变化信号的频率及周期参数测量，若配以适当的传感器，本系统也可实现多种非电量周期信号参数的测量，如机械振动的频率，转速，声音的频率等。 关键词： 数字频率计系统，单片机系统，系统设计，软件设计 Abstract The digital frequency meter is essential metering equipment in the production field of computer, communication equipment, audio frequency and video frequency, its basic function is measure sinusoidal signal, the square-wave signal and any other periodic signal frequency and the cyclical parameter. The digital frequency meter demonstrate the measured parameter by decimal, so it has many advantages like rapidly measure、high precision and Visual display.Now we based on the single-chip microprocessor and some peripheral circuit to design and produce a frequency measurement system, and mainly research the part of programmer. The main design idear is used by timing and counting to realize the measurement of periodic signal 's frequency, and then through the M-ary conversion and use of the LED display to dynamicly display four frequency parameters, and the measurement range is 1Hz-10kHz.The programme use of assembly language, and mainly used by preparation of the compiler-wei Fu. Practical operation show that the designed system is running normally,and the results is correct. In the orthe side, it can measure the frequency and cycle parameters of a variety of cyclical changes signall through shaping the input signa's waveform, if accompanied a appropriate sensors, the system can also measure various non-periodic signal parameters, such as mechanical vibration frequency, speed and sound frequency. Key words：Digital frequency meter system，Single-chip microcomputer system，System Design，Software Design
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基于海康4004HCP板卡的机动车牌智能识别系统_电气工程论文
电气工程论文 摘 要II AbstractIII 1绪论1 1.1研究背景1 1.1.1车牌识别系统国外状况1 1.1.2 车牌识别系统国内状况1 1.2 研究任务与目标2 2 海康车牌识别板卡3 2.1 产品介绍3 2.1.1 技术简介4 2.1.2 产品功能4 2.1.3 识别性能5 2.2 产品应用与开发支持5 2.2.1 产品应用5 2.2.2 开发支持6 3 开发软件Visual C++7 3.1 VC++简介7 3.1.1 C++的发展7 3.1.2 可视化编程及其发展8 3.1.3 面向对象程序设计9 3.2 Visual C++ 6.0的开发环境简介11 3.2.1 Visual C++ 6.0的用户界面简介11 3.2.2 MFC简介11 4 车牌智能识别系统14 4.1 车牌图像预处理14 4.1.1 图像灰度化14 4.1.2 中值滤波14 4.1.3 灰度变换14 4.1.4 直方图均衡化15 4.1.5 图像二值化16 4.2 车牌定位16 4.2.1 定位常用方法比较16 4.2.2 水平搜索定位17 4.2.3 汽车牌照的左右定位18 4.3 车牌字符切割19 4.3.1 字符切割研究现状19 4.3.2 车牌图像二值化19 4.3.3 字符切割算法20 4.3.4 车牌图像的归一化20 4.4 车牌字符识别21 4.4.1 牌照字符识别的常用方法介绍与比较21 4.4.2 BP神经网络识别22 5 基于海康4004HC/P板卡的系统实现27 5.1 系统软件设计27 5.1.1 海康4004HC/P板卡介绍27 5.1.2 错误号定义28 5.1.3 数据类型及结构体定义28 5.1.4 函数列表30 5.1.5 函数说明30 5.1.6 软件界面及调试34 5.2系统施工36 5.2.1 车牌识别系统外围产品选型36 5.2.2 车牌识别工程现场调试与安装36 6 总结39 致 谢40 参考文献41 摘 要 随着世界各国工业迅猛发展，汽车数量与日剧增，城市交通状况日益受到人们的重视，如何有效地进行交通管理，越来越成为各国政府和有关部门所关注的焦点。科学、高效的利用好现有交通基础资源成为进一步挖掘我国城市交通能力的有效途径。针对此问题，开发智能交通系统是较合适的解决方法。智能交通系统也是2l世纪世界道路交通的发展趋势。 车牌识别技术史一个以特定目标为对象的专用计算机视觉系统，能从一幅图像中自动提取车牌图像，自动分割字符，进而对字符进行识别。该技术对采集到得汽车图像进行处理，能够实时准确地自动识别出车牌的数字、字母及汉字字符，并以计算机可直接运行的数据形式给出识别结果。 此次研究使用海康威视DS-4004HC/P车牌识别智能板卡，此卡压缩比极高，图像质量好，实时完成视频图像的压缩，不丢帧，能较好的完成车牌识别功能，节省了开发时间，同时也提高了系统性能，保证车牌识别准确度。 本文针对车牌智能识别系统的各关键技术进行研究，采用了新的思想和方法，对车牌字符识别技术的研究具有很大的意义和应用价值。 关键词：车牌识别；车牌定位；字符切分；车牌字符识别 Abstract With the rapid development of industrial countries in the world， increase the number of cars with the day， the city traffic conditions have become an increasing attention， effectively traffic management， has become a focal point of concern by more and more governments and relevant departments. How to make good use of existing transportation infrastructure and resources scientifically for the Chinese cities has become an effective means of transport for that matter， the development of intelligent transportation system (ITs) is a more appropriate solution. Intelligent Transportation Systems is the world's road traffic 2l century trends. In particular, a license plate identification technology for the target object special computer vision system, from a picture can automatically extract the image segmentation, and character, and character recognition. This technology to automobile collected on image processing, can be accurately identify real plate number, letters and Chinese characters, and can be directly to the computer operation data form identification results. This study uses Hikvision DS-4004HC/P card， this card has very high compression ratio， image quality， real-time video images to complete the compression， and won't dropped frames， It can finish the recognition of the completion of registration better， save the development time， but also improve the system performance to ensure the accuracy of license plate recognition. Aiming at the plate intelligent identification system, the key technology for adopting new ideas and methods of plate character recognition technology, the research has great significance and application value. Keywords：License Plate Recognition; plate positioning; character segmentation; license plate character recognition
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单相逆变电源设计_电气工程论文范文
电气工程论文 目 录 摘 要I AbstractII 1 绪论1 1.1选题背景1 1.2光伏发电的发展和现状1 1.2.1国外光伏发电的研究现状1 1.2.2我国光伏发电的研究现状1 1.2.3光伏发电的技术问题2 2 太阳能光伏并网发电系统基本原理4 2.1光伏并网发电工作的基本原理4 2.2.1蓄电池组简介5 2.2.2逆变器作用6 2.2.3控制器6 3 单相光伏并网系统硬件电路的设计7 3.1硬件电路原理图7 3.2 MPPT的控制电路8 3.2.1 SG3525简介13 3.2.1SG3525引脚功能说明14 3.3 DC/AC变换电路15 3.3.1 SPWM原理16 3.3.2 IRF740简介17 3.3.3逆变电路简介17 3.3.4 AT89051单片机简介18 3.4保护电路19 3.4.1LM324应用19 3.4.2输入欠压保护电路19 3.4.3输出过流保护电路19 4 参数计算及软件编程20 4.1同频同相的控制方法及参数计算20 4.2提高效率的方法21 4.3滤波参数计算21 4.4软件设计及程序框图22 4.4.1程序算法23 4.4.2测试方案与测试结果23 4.4.3频率相位测试24 4.4.4欠压、过流、过压恢复功能25 4.4.5效率测试26 4.4.6失真测试27 4.4.7 SPWM生成程序29 5 总 结31 致 谢32 参考文献33 附 录34 摘 要 在能源枯竭与环境污染问题日益严重的今天，为了满足人们经济活动对能源需求的日趋增加，光伏利用成为世界各国争相发展的热点，光伏并网发电作为太阳能光伏利用的发展趋势，也必将得到快速的发展。本文模拟了光伏并网发电，采用AT89C51单片机作为主控制器的方案，应用SPWM技术实现直流电向正弦交流电转变。利用推挽输出电路实现最大功率点跟踪（MPPT）功能,且保护时能使推挽输出和逆变电路不工作,可以实时采集电网的频率，实现与电网频率的同步。还具备欠压、过流保护等功能。 关键词：光伏并网发电；正弦脉宽调制；最大功率点跟踪（MPPT）；DC/AC转换 Abstract A nowadays，on account of the problems of environmental pollution and exhaustion of energy sources become worse，To meet the economic activities of the increasing demand for energy ,the photovoltaic application has been a hot spot that most countries compete against each other to develop. As the main development trend of photovoltaic applications grid-connected photovoltaic system will certainly be promoted rapidly. A grid-connected PV is simulated by using C51as the main controller，application SPWM technology changes DC to Ac sine. Push-pull output circuit is used for maximum power point tracking (MPPT) function and protected push-pull output and the inverter circuit don't work. It can achieve synchronization with the grid frequency automatically. Also has under-voltage, over-current protection functions. Keyword: Grid-connected PV；SPWM；MPPT；DC/AC change
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浦江县黄宅变电所供电设计_电气工程论文范文
电气工程论文 目 录 摘 要 Ⅰ 1 绪 论1 1．1 变电所供电的意义和要求1 1．2 国内外供电技术的现状与发展趋势1 1．3 本文所依据的主要国家标准和技术规范2 1．4 本文所做的主要工作2 2 黄宅变电所设计资料4 2．1 黄宅变电所设计要求4 2．2 黄宅变电所设计资料4 3 负荷计算6 3．1黄宅变电所负荷计算方法6 3．2黄宅变电所负荷计算6 3．3集中功率补偿9 4 黄宅变电所变压器容量的选择及台数的选择13 4．1变压器台数选择原理13 4．2变压器台数容量和型号选择13 5 总降压变所主接线设计15 5．1主接线方案设计原则15 5．2主接线方案设计15 6 短路电流计算17 6．1短路电流计算的目的及方法17 6．2本设计采用标幺制法进行短路计算17 7 高压配电装置选择23 7．1高压开关柜选择23 7．2断路器的选择23 7．3高压熔断器和熔体的选择27 7．4电压及电流互感器的选择27 7．5 35kV和10kV侧一次设备的选择校验28 8 黄宅变电所高压进出线的选择继电保护设置30 8．1总变电所高压进线的选择与校验30 8．2 10/0.4kV变电所及高压设备进线的选择与校验31 9 继电保护整定与计算32 9．1 KC1的整定32 9．2 KC2的整定33 10 防雷与接地设计35 10．1防雷35 10．2接地36 11 总结39 致谢40 参考文献41 附录图142 摘 要 本文详细介绍了浙江浦江县黄宅35kV总降变电所的设计。文中对主接线的选择、高压设备的选择、负荷计算、短路电流计算,各种继电保护选择和整定计算皆有详细的说明。特别对主接线的选择,变压器的选择,还有一些电气设备如断路器、电流互感器、电压互感器等的选择校验作了详细的说明和分析。其中还对变电所的主接线，平面布置，高低压侧的一些保护装置等通过CAD,VISIO制图直观的展现出来。 本次设计的内容紧密结合实际，通过查找大量相关资料，设计出符合当前要求的变电所。设计中采用了一些固定方式的保护和常规保护可以使变电站内值班人员或调度中心的人员及时掌握变电所的运行情况，直接对设备进行操作，及时了解故障情况，并迅速进行处理，达到供电系统的管理科学化、规范化、并且还可以做到与其他自动化系统互换数据，充分发挥整体优势，进行全系统的信息综合管理。 关键词: 供电设计,变压器,开关柜,继电保护 Abstract This paper mainly introduces the design of 35kV substation in south city of ZheJiang. It also discusses the choice of main wiring, high pressure equipment and all kinds of the protection of relay, the calculation of load, short current and so on in detail, especially, the choice of main wiring, transformer and some electric equipment such as circuit breaker, current and Voltage sensor. It shows main wiring of substation, the distribution of plane and some protection equipment of high and low Voltage by the graphics of CAD,VISIO. This design is closely related to reality in order to design the suitable substation by studying a lot of materials. The design adopts some stable-form and general protections, which can make workers on duty control the situation of substation timely, operate the equipments directly, know the breakdown and deal with it without delay, so that the system of power supply is scientific and standard in management. What’s more, it can exchange data with other automatic systems and giVe full play to whole adVantage in order to manage information in all systems as a whole. Keywords：Power supply design , Transformer switchgear ,protection of relay
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温州110kV江滨变电站一次系统设计_电气工程论文范文
电气工程论文 目 录 摘要 . I 1 前言 1 1.1 本课题研究的意义及目的 1 1.2 110kV变电站的现状与发展趋势 1 1.3 本文所做的主要工作 2 2 江滨变电站原始资料及设计要求 3 2.1 江滨变电站设计要求 . .3 2.2 江滨变电站原始资料 ... .3 2.3 江滨变电站负荷计算与分析 . 5 3 江滨变电站一次接线设计 8 3.1 110kV变电站电气主接线设计要求 8 3.2 110kV变电站电气主接线方案比较 ...…8 3.3 江滨变电站主变压器选择 11 3.4 江滨变电站电气主接线设计 13 3.5 江滨变电站高压母线选择 14 4 江滨变电站输电线路设计 16 4.1 江滨变电站110kV受电线路设计 16 4.2 江滨变电站35kV输电线路设计 17 4.3 江滨变电站10kV输电线路设计 18 5 江滨变电站短路计算 . ...…......…..20 5.1 短路计算的意义、方法及步骤 20 5.2 江滨变电站短路计算 20 5.2.1 短路计算点的确定 20 5.2.2 短路电路中各元件的电抗标幺值求取 21 5.2.3 各短路计算点短路计算过程与分析 22 6 江滨变电站高压开关设备选择及校验 26 6.1 高压电气设备选择的要求 26 6.2 江滨变电站110kV开关设备选择与校验 27 6.3 江滨变电站35kV开关设备选择与校验 29 6.4 江滨变电站10kV开关设备选择与校验 33 6.5 江滨变电站高压配电装置设计 37 7 江滨变电站接地与防雷系统设计 39 7.1 接地装置设计要求 39 7.1.1 江滨变电站的接地装置设计 39 7.2 防雷保护 40 7.2.1 防雷保护的设计原则 41 7.2.2 避雷针的保护范围 41 7.2.3 确定本站避雷针 42 8 总结 45 致谢 46 参考文献 摘 要 本设计围绕温州110kV江滨变电站电气系统展开。根据变电站运行的安全性及可靠性要求，确定了主接线方案，根据实际负荷情况，选择了变电站的主变压器，实施了相应的短路计算，对各类高压开关电器设备进行了选择与校验，并对各类导线进行了选择与校验，最后完成了相关电气图纸的设计。本设计依据《35-110kV变电站设计规范》，《供配电系统设计规范》等国家标准，并严格遵循变电所电气部分的设计原则。 关键词：供电设计，110kV变电站，一次系统设计 Abstract The design is start around with the electrical system of Wenzhou 110kV Jiangbin substation. Substation operation in accordance with the safety and reliability requirements of the program to determine the main terminal, according to the actual load, select the main transformer substations, the implementation of the corresponding short-circuit calculation, the various types of high-voltage switchgear electrical equipment selection and validation, all kinds of wires and carried out selection and validation, and finally completed the design drawings related to electrical. The design is based on "35-110kV Substation Design Code", "design specifications for the power distribution system" and other national standards and strict compliance with the principles of electrical substation design. Key words: Power Supply Design、110kV substation、A system design
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基于Ansoft 平台的五金工具充磁磁场分析_电气工程论文
电气工程论文 目 录 摘 要I AbstractII 1 前 言1 1.1 电磁场理论的建立与发展1 1.2 有限元方法的发展及应用2 1.3 有限元方法在电磁场分析中的应用4 1.4 本文所需完成的工作5 2 Ansoft Maxwell简介6 2.1 Ansoft Maxwell的应用背景6 2.2 Ansoft Maxwell的发展方向7 2.3 Ansoft Maxwell3D介绍7 2.4 Ansoft Maxwell3D简要操作流程9 3 充磁线圈磁场有限元分析11 3.1 充磁线圈有限元建模11 3.1.1 圆柱体充磁线圈有限元建模11 3.1.2 长方体充磁线圈有限元建模12 3.1.3 八面体充磁线圈有限元建模14 3.2 设定充磁线圈求解条件16 3.2.1 指定模型各部分的属性16 3.2.2 指定边界条件和激励源16 3.2.3 指定求解规范17 3.2.4 求解条件验证17 3.3 后处理器分析18 3.3.1 圆柱体充磁线圈的求解分析18 3.3.2 长方体充磁线圈的求解分析26 3.3.3 八面体充磁线圈的求解分析34 3.4 导出分析结果42 3.5 MATLAB辅助分析42 3.5.1 MATLAB分析流程42 3.5.2 MATLAB分析圆柱体充磁线圈导出结果43 3.5.3 MATLAB分析长方体充磁线圈导出结果50 3.5.4 MATLAB分析八面体充磁线圈导出结果56 3.6 分析结果总结63 4 结论64 致 谢65 参考文献66 摘 要 为了适应不断提高的五金工具生产要求，满足当今社会的发展需要，对五金工具进行充磁磁场研究变得刻不容缓。而通过运用Ansoft Maxwell3D软件平台，针对不同形状与类型的充磁线圈结构，建立相应的数学模型，经过一系列的条件设定后，利用有限元方法进行分析研究，从而得到充磁线圈内部空间的磁场分布。并运用MATLAB软件对所得结果进行辅助分析，导出磁通密度空间分布图。对所得图表进行系统而全面的分析，最终得出结论。所获得的研究结论与实际结果基本一致。研究结果充分分析充磁线圈的磁场特性，有助于改善五金工具的生产工艺，优化五金工具的磁场特性，对提高相应产品的生产质量，提升产品的市场竞争力有积极意义，并且为进一步研究五金工具充磁磁场创造有利条件。 关键词：充磁线圈磁场分析、Maxwell3D、有限元建模、有限元分析 Abstract For the adaption to the development of hardware technology and meet social demands, it becomes urgent to research the magnetic of charging coil for hardware. The Ansoft Maxwell3D was used to build different kinds of magnetic of charging coil mathematical models and to set a series of factors. The finite element method was used to get the inner magnetic distribution of charging coil. Then the MATLAB was used to analyze the results that came from Maxwell3D, the magnetic flux density spatial distributions diagrams were exported and they were analyzed entirety. Finally the conclusion was completed the same as the actual result. The magnetic field characteristics of magnetic of charging coil was researched fully, so it is benefit to increase the product technology and optimize magnetic characteristics, therefore, the product quality is improved and the product competitive power is advanced. What's more, a condition that research hardware magnetic field deeply is created. Keywords：magnetic of charging coil researching, Maxwell 3D, finite element method modeling, finite element method analysis
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太阳能LED路灯控制系统的研制_电气工程论文范文
电气工程论文 目录 摘 要II 1 绪论1 2 总体方案设计2 2.1 系统总体结构2 2.2 太阳能路灯各部件结构3 2.2.1太阳能电池组件3 2.2.2太阳能路灯光源5 2.2.3超级电容器5 2.2.4控制器7 2.2.5灯杆及灯具外壳7 2.2.6线缆和连接紧固辅件8 3 太阳能电池的设计9 3.1 太阳能路灯电池板分类9 3.1.1单晶硅太阳能电池9 3.1.2多晶硅太阳能电池10 3.2 太阳能电池的伏-安特性及主要参数12 3.3 太阳能路灯电池板组件选取13 3.3.1单晶硅太阳能电池组件结构规格及技术参数13 3.3.2多晶硅电池组件结构规格及技术参数15 4 白光LED及其驱动电路18 4.1 白光LED18 4.1.1白光LED的特点18 4.2 白光LED驱动电路19 4.2.1白光LED驱动电源的分类19 4.2.2白光LED的直流驱动21 4.2.3利用单片机的白光LED的直流驱动23 5 超级电容及路灯控制电路24 5.1 超级电容器24 5.1.1超级电容器储能原理及等效电路模型24 5.1.2超级电容器储能系统25 5.2 控制器主回路及其工作原理26 5.2.1MPPT控制方法26 5.2.2控制器主回路硬件的实现27 5.2.3系统软件的实现30 5.2.4实验结果及分析31 6 太阳能LED路灯的简化电路及成果演示33 6.1 太阳能LED路灯控制电路的实验室实现33 6.2 关于电路的改进33 6.3 成果演示34 7 总结36 致谢37 参考文献38 附录1 系统总原理图及PCB图39 附录2 单片机程序44 摘 要 太阳能LED路灯系统采用高效单晶（多晶）硅太阳能电池供电，采用蓄电池（超级电容）存储电能，用高效LED照明，并采用先进的充放电和照明控制电路，具有性能可靠、发光效率高、亮度大、安装方便、无须铺设电缆电线、无须交流电源、采用直流供电、光敏控制、安全可靠、节能、经济、环保、实用（根据配置和型号不同，充电一天可用3～7天）、寿命长（太阳能电池可用15～20年、蓄电池（超级电容）可用5～7年）等优点，是未来户外照明的发展方向。 本文设计了一个光伏发电系统管理控制电路，实现对太阳能LED路灯的智能控制。白天，当阳光照射到太阳能电池组件表面时，太阳能电池的光生伏特效应产生电能通过充电电路对蓄电池（超级电容）进行充电；夜晚，光线逐渐减弱，太阳能电池的工作电压、工作电流不断下降，当工作电压小于控制器设定电压时，控制器启动负载，此时太阳能灯点亮，当设定的时间到达或环境光线过强时控制器自动关闭负载，太阳能电池充电开始。由此不断循环。 关键词： 太阳能、LED、控制 Abstract Solar LED lamp system uses high efficiency single crystal (multi crystal) silicon solar cell to supply power, uses the storage battery (super capacitor) to store electrical energy, uses efficient LED to light, uses advanced charging and discharging technology and lighting control circuit. It has the advantages of reliable capability, high luminous efficiency, high brightness, convenient installation, without cable wires, without AC power supply, using DC supply, photosensitive control, safety, reliability, energy saving, economic, environmental-friendly, utility (the system can work 3 to 7 days basing on different configuration and model charge), durable (solar cell can be used 15 to 20 years, super capacitor can be used 5 to 7 years), and so on. It is the future direction of outdoor lighting system. In this thesis, a circuit managing and controlling the photovoltaic power system is designed, which achieves intelligent control of the solar LED lamp system. In the daytime, basing on the photovoltaic effect, the solar battery recharges the storage battery through the charging circuit. At night, light intensity is gradually weak so that the working voltage and the working current of the solar battery continuously reduce. The storage battery drives the LED lamp when the working voltage is less than the setting voltage. While the light intensity is enough intense, the controller cuts the load and recharges the storage battery again. The system works back and forth as above-mentioned. Keywords： solar、LED、control
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SPWM变频器设计_电气工程论文范文_电气工程论文
电气工程论文 摘要：随着电力电子技术和微机控制技术的飞速发展和人们对交流电机调速方法的研究的不断深入，直流调速逐步被交流调速所取代。在现有的交流电动机调速方法中，变频调速受到人们的普遍关注，已经在很多领域得到了应用，在我国也被列为重点的技术推广项目。 电压型正弦脉宽调制（SPWM）变频器以其独有的技术优势而得到快速的发展和广泛应用。先进的控制策略，高性能的控制芯片，智能化高速开关器件相结合成为现代交流调速技术发展的主流趋势。数字方法在可靠性、灵活性、可控性等方面具有模拟方法无法比拟的优越性。目前，市场上相继推出的数字式SPWM变频器中，大多数都采用了专用SPWM芯片。虽然，可使编程简单，但这些器件往往价格高昂，增加了硬件成本。 鉴于此，本设计中的变频器采用Microchip推出的电机专用8位微控制器PIC16F767构成数字化变频器，通过编程产生驱动信号SPWM波，大大简化了用于产生PWM波形的软件和硬件，使系统简化，同时提高了其动、静态性能。 关键词： 变频调速； SPWM； 电机； PIC16F767 Abstract:With the power electronics and microcomputer control technology and the rapid development of the people of AC motor speed control of the in-depth study DC Speed exchanges were gradually replaced by the governor. The existing AC motor speed control methods, VVVF by people's attention, In many areas has been used in China have been listed as a key project to promote the technology. - Sinusoidal voltage pulse width modulation (SPWM) converter with unique advantages in technology and the rapid development and wide application. Advanced control strategies, the control of high-performance chips, intelligent high-speed switching devices combining modern AC trend of the mainstream of development. Digital methods in terms of reliability, flexibility, controllability, and other aspects simulation method unmatched superiority. Currently, the market has introduced a digital INVERTER; most have adopted a special SPWM chip. Although the program will enable simple, but these devices are often expensive and increase the cost of hardware. Because of this, The design of the inverter using Microchip introduced the Motor exclusive eight PIC16F76 microcontroller 7 a digital converter, have driven through programming SPWM signal, greatly simplified for the purpose of generating a PWM waveform software and hardware, allowing the system to simplify and improve their static and dynamic properties. Keywords： frequency speed control； SPWM； electrical machine；PIC16F767
