基于單片機的無功補償?shù)脑O計

測控論文編號:CK092   論文字數(shù):14963,頁數(shù):55

一．緒論 6
1.1無功補償?shù)哪康暮鸵饬x 6
1.2無功補償概述 6
1.3基于單片機的無功補償?shù)脑O計要求 8
1.4 設計思想 10
二、基于單片機的無功補償系統(tǒng)的設計 12
2.1動態(tài)無功補償裝置原理 12
2.2控制器工作原理 12
2.3系統(tǒng)軟件的組成與設計 13
2.4優(yōu)點 14
三、 交流采樣值的算法實現(xiàn) 15
3.2極性自動識別 16
3．3 控制算法 18
四、電路設計及主要芯片資料 19
4.1 硬件電路設計 19
4.2 AT89C52概述 21
4.3 X25045 23
4.4線性集成穩(wěn)壓器 25
結 束 語 28
致謝 29
參考文獻： 30
附錄 31

摘 要
 近年來，隨著我國電力工業(yè)的不斷發(fā)展，大范圍的高壓輸電網(wǎng)絡逐漸形成，同時對電網(wǎng)無功功率的要求也日漸嚴格。電網(wǎng)無功功率不平衡將導致系統(tǒng)電壓的巨大波動，嚴重時會導致用電設備的損壞。因此，研究無功補償及其部件的發(fā)展具有重要的經濟意義。
 設計了一種全自動無功補償裝置。此裝置是在考察先前的手動或電磁式無功補償裝置的基礎上由筆者自行設計的，主要采用AT89C51單片機作為微處理器實現(xiàn)全自動控制。系統(tǒng)對電網(wǎng)電壓和電流進行采樣、計算，從而獲得COS∮和有功功率。本裝置可實現(xiàn)功率因素從COS∮=0.6補償?shù)紺OS∮=0.95，且能保證功率因素變化時電容的自動投切，能實時顯示出當前功率因素、電流和有功功率，并能實現(xiàn)手動和自動控制。
 關鍵詞：無功補償 單片機 交流采樣

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