低压无功补偿毕业论文.doc

文档介绍：本科生毕业设计(论文)
题目: 低压无功补偿器设计
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2011年 5 月 25日
摘要
本课题研究以低压电网无功补偿改造为背景,研制了一种低压无功功率补偿控制器。作为一种非实时的无功补偿装置,该装置以定时的电网监测数据为依据,以城镇低压网(220V)的无功补偿为对象。本文主要研究了无功补偿对电网性能的改善,以及控制器的软硬件的配置。
系统采用单片机,该单片机是美国ATMEL公司生产的低电压,高性能的CMOS 8位单片机,具有运算速度高,实时性好的特点;软件则使用汇编语言进行编译;人机操作界面采用LCD显示,显示效果较好;A/D转换采用,是一款比较实用的A/D转换装置。该装置可跟踪电网无功功率的变化并自动补偿,实现了无功补偿装置的优化运行,具有体积小、原理简单、智能投切等优点。
关键词:无功补偿;单片机;低电压
Abstract
What this article studies is based on the alteration of reactive pensation of low voltage, then design an equipment for reactive pensation of low voltage. As a kind of reactive pensation, this equipment is basis on the work monitor data ,and provides reactive power for city’s low voltage power grids. This thesis has discussed the importance of the reactive pensation for the power grids ,and introduded the hardware and software of the controller.
This device's hardware core is AT89C51 SCM , which has many merits such as high operating speed. This monolithic integrated circuit is the low voltage which American ATMEL Corporation produces, a high performance CMOS 8 monolithic integrated circuits;The software uses the assembly language to carry on the translation;The man-machine operation contact surface uses the LCD demonstration, the demonstration effect is quite good; A/D transformation uses ADC0809 , it is a section of quite practical A/D switching device. This equipment may track the work reactive power the change and the pensation, and this installment has the volume to be small, the precision is high, the pared to the higher merit.
Key Words: Reactive pensation; SCM(Single Chip Micyoco);Low voltage
目录
摘要 0
ABSTRACT 0
目录 0
第一章绪论 1
研究背景 1
无功补偿装置的发展状况 2
本课题主要研究的内容 4
第二章无功补偿的原理 5
无功补偿的原理 6
低压电网中的几种无功补偿的方式 9
确定补偿容量的几种方法 10
从提高功率因数需要确定补偿容量 10
从降低线路有功损耗需要来确定补偿容量 10
从提高运行电压需要来确定补偿容量 11
本章小结 12
第三章硬件设计 12
无功补偿装置的技术要求 12
补偿控制应符合技术条件: 12
测量精度 12
控制器原理 13
硬件介绍 13
CPU 14