微机型高压电网继电保护系统的设计

电子机电论文编号:JD337 本份设计附开题报告,任务书,外文翻译,原理图,PCB,字数:13572,页数:35  oúì 目    录
摘  要 I
Abstract II
1 绪论 1
1.1智能型高压电继电保护系统基本概念 1
1.2 智能型高压电继电保护系统的基本构成 1
1.3高压电继电保护系统发展及现状 2
2 系统硬件设计 4
2.1 微机型高压电继电保护系统结构框图 4
2.2 TMS320LF2407A的优势及特点 4
2.3 TMS320LF2407A最小系统 5
2.3.1 DSP核心供电及复位电路 5
2.3.2 晶振电路设计 5
2.3.3 电源电路设计 7
2.3.4片外存储器 7
2.4信号调理及滤波单元 8
2.4.1信号调理单元 8
2.4.2低通滤波器 11
2.5模数转换电路采样保持部分设计 11
2.5.1 MAX125的特性及工作原理 12
2.5.2电平转换电路设计 13
2.6开关量控制电路 14
2.6.1 开关量输出的应用特点 14
2.6.2 输出控制电路设计 14
2.7键盘接口电路 15
2.7.1键盘处理的基本思路 16
2.7.2 键盘电路设计 16
2.8液晶显示模块电路 18
2.8.1 LCD液晶显示器使用方法 18
2.8.2 LCM320240的引脚定义 19
2.8.3 液晶电路设计 19
2.9 DSP与PC机通信电路设计 21
2.9.1串行通信的基本概念 21
2.9.2远距离串行通信设计 21
2.10 PCB设计 22
结    论 24
参 考 文 献 25
附 录 Protel原理图 26
致    谢 31

摘  要
随着现代化生产的机械化、自动化程度的提高，供电容量不断增大、电网电压不断提高，对电气设备保护的可靠性、技术的先进性要求越来越高。为了有效保证人身及设备安全开发研制智能型高压电监测保护系统势在必行。微机型高压电网继电保护系统抗干扰能力强，通过键盘与液晶显示单元可以方便的进行现场观察与各种保护方式与保护参数的设定。普通的采集处理方法对多路进行采样计算显得困难，为了克服以上不足，满足现代电力系统的要求，将先进的数字信号处理（DSP）技术应用到电力系统中充分发挥其强大的快速运算和并行运行处理能力，满足电力系统监控的实时性和处理算法的复杂性等要求，为电力系统的检测技术中不断发展的新理论和新算法应用于实践中奠定技术基础。
本文是基于TI公司的TMS320LF2407A型DSP芯片作为高压电继电保护系统的中央处理器。通过MAX125的14位A/D转换器采集高压电网中交流模拟量来转换为供DSP处理的数字量，从而进行数据分析处理，对整个高压电网的运行状况进行实时监控，当遇到不良运转时控制外部继电器迅速跳闸，切断电网，从而保护整个电网及其他用电设备。

关键词：TMS320LF2407A型DSP  交流采样  MAX125A/D转换器

Abstract
Along with the modernization of production mechanization and automation, capacity of power supply increased continuously, voltage of power grid continuously improve, the requirement of reliability of electrical equipment and technical requirements of the advanced nature getting higher and higher. It’s necessary to develop intelligent high-voltage protection monitoring system in order to guarantee personal and equipment security effectively. Microcomputer high-voltage power grid relay protection system has strong anti-interference capability, it is convenient to set that on-site observation protection methods and the protection of parameters through the keyboard and LCD display modules. Ordinary collecting method is difficult to calculate for multi-channel approach to sampling, in order to avoid the above inadequate and satisfy the requirements of modern power system, advanced digital signal processing (DSP) technology applications are introduced to the power system and show its strong rapid operational and run in parallel processing capability, which satisfy the requirements of real-time monitoring and processing algorithms, establishing a technology base in practice for continuous development of new theories and new algorithm in the power detection system.
Basing on TI Corporation's DSP chips TMS320LF2407A as high-voltage protection system CPU in this article, AC analog which comes from high voltage power grid is converted to digital value which DSP can process by 14-bit A/D converter MAX125, monitoring the entire status of the high-voltage power grid in real-time, tripping off by controlling external relay quickly when abnormal operation happened, turn off the power grid to protect the power grid and other electrical equipment.

Key Words：TMS320LF2407; Alternating Current Data Acquisition; MAX125A/D Converter