基于单片机的无功补偿的设计

测控论文编号:CK092   论文字数:14963,页数:55

一．绪论 6
1.1无功补偿的目的和意义 6
1.2无功补偿概述 6
1.3基于单片机的无功补偿的设计要求 8
1.4 设计思想 10
二、基于单片机的无功补偿系统的设计 12
2.1动态无功补偿装置原理 12
2.2控制器工作原理 12
2.3系统软件的组成与设计 13
2.4优点 14
三、 交流采样值的算法实现 15
3.2极性自动识别 16
3．3 控制算法 18
四、电路设计及主要芯片资料 19
4.1 硬件电路设计 19
4.2 AT89C52概述 21
4.3 X25045 23
4.4线性集成稳压器 25
结 束 语 28
致谢 29
参考文献： 30
附录 31

摘 要
 近年来，随着我国电力工业的不断发展，大范围的高压输电网络逐渐形成，同时对电网无功功率的要求也日渐严格。电网无功功率不平衡将导致系统电压的巨大波动，严重时会导致用电设备的损坏。因此，研究无功补偿及其部件的发展具有重要的经济意义。
 设计了一种全自动无功补偿装置。此装置是在考察先前的手动或电磁式无功补偿装置的基础上由笔者自行设计的，主要采用AT89C51单片机作为微处理器实现全自动控制。系统对电网电压和电流进行采样、计算，从而获得COS∮和有功功率。本装置可实现功率因素从COS∮=0.6补偿到COS∮=0.95，且能保证功率因素变化时电容的自动投切，能实时显示出当前功率因素、电流和有功功率，并能实现手动和自动控制。
 关键词：无功补偿 单片机 交流采样

Abstract
 In recent years, with the continuous development of China's power industry, a wide range of high-voltage transmission network gradually, while reactive power requirements are increasingly strict. Reactive power system voltage imbalance will lead to great fluctuations,and cause severe damage to electrical equipment. Therefore, the study of reactive power compensation has important economic significance.
 A fully automatic reactive power compensation devices. This device is in the previous inspection manual or electromagnetic reactive power compensation devices based on self-designed by the author, mainly using AT89C51 single-chip microprocessor as the realization of automatic control. System to the power grid voltage and current sampling, computing, to gain COS ∮ and active. The device can be realized from the power factor COS ∮ = 0.6 compensation to the COS ∮ = 0.95, power factor and can ensure that changes in the automatic switching to real-time shows that the current power factor, current and active, and can achieve the manual and automatic control.
Key words:  reactive power compensation   SCM   AC Sampling