電力網(wǎng)絡(luò)結(jié)構(gòu)變更時(shí)的三相短路電流計(jì)算
 
內(nèi) 容 摘 要

在電力系統(tǒng)運(yùn)行過程中，經(jīng)常會(huì)發(fā)生各種故障，最為常見的是各種形式的短路，其中以三相短路最為嚴(yán)重。三相對(duì)稱短路電流的計(jì)算分析是電力系統(tǒng)電氣設(shè)備選擇及設(shè)計(jì)，繼電保護(hù)的合理配置及定值整定和運(yùn)行分析等問題的重要依據(jù)。本文基于電力系統(tǒng)短路理論及電力系統(tǒng)故障計(jì)算用的數(shù)學(xué)模型理論，利用節(jié)點(diǎn)阻抗矩陣推導(dǎo)出電力網(wǎng)絡(luò)結(jié)構(gòu)變更時(shí)三相短路的實(shí)用計(jì)算機(jī)算法。該算法利用Matlab語(yǔ)言編程完成，大大減輕了傳統(tǒng)計(jì)算曲線法的工作量，能夠自動(dòng)完成電力網(wǎng)絡(luò)結(jié)構(gòu)變更時(shí)三相對(duì)稱短路的短路電流、各節(jié)點(diǎn)電壓及指定各支路電流的求解，并通過實(shí)例驗(yàn)證了算法的正確性和合理性，而且具有較高的準(zhǔn)確度。

關(guān) 鍵 字
短路電流計(jì)算；結(jié)構(gòu)變更；阻抗矩陣； MATLAB
 
Calculation of the three-phase symmetrical short-circuit current in process of the change of the electrical power mesh configuration
02067325 Guorong Tan   Tutor: Yiqin Wang   Lecturerl
                            Dan  Zhang  Assistant
Abstract
In the process of electrical power system, different kinds of breakdowns will frequently crop up, of which the most common ones are various forms of short-circuit, and among them the three-phase short-circuits is the most serious. The computational analysis of the three-phase symmetrical short-circuit current is not only the foundation of the choice and design of equipment in the electrical power system, but also the important basis for those problems of reasonable disposition, definite value of relay protection. Based on the theory of the breakdowns and movement analysis and the mathematical model of the electrical power system, practical computer algorithm for calculating three-phase short-circuits during the change of the electrical power structure is deduced using the node impedance matrix. With Matlab method software, the workload is reduced greatly compared with the traditional computation curve method. This method can automatically complete the calculation of the short-circuit current and the electrical voltage of every node, and the current of nominated branches when the electrical power mesh configuration changes. What’s more, its accuracy and reasonableness have been tested.
Key Words
Calculation of short-circuit current; change of mesh configuration; impedance matrix; MATLAB
 
目   錄

1. 緒 論……………………………………………………………1
1.1 論文意義 …………………………………………………1
1.2 研究現(xiàn)狀及發(fā)展 …………………………………………1
1.3 本論文的主要工作 ………………………………………2
2. 短路的相關(guān)概述 ………………………………………………3
2.1 電力系統(tǒng)的短路故障 ……………………………………3
2.2 應(yīng)用計(jì)算曲線計(jì)算短路電流 ……………………………5
3. 電力系統(tǒng)網(wǎng)絡(luò)變更時(shí)三相對(duì)稱短路的實(shí)用算法 ……………6
3.1 電力網(wǎng)絡(luò)的數(shù)學(xué)模型 ……………………………………6
3.2 三相對(duì)稱短路的計(jì)算 ……………………………………15
3.3 網(wǎng)絡(luò)結(jié)構(gòu)變更時(shí)的三相短路計(jì)算………………………19
4. 網(wǎng)絡(luò)結(jié)構(gòu)變更時(shí)三相短路計(jì)算機(jī)算法的實(shí)現(xiàn) ………………23
4.1所選編程語(yǔ)言介紹 ………………………………………23
4.2程序?qū)崿F(xiàn)說明 ……………………………………………23
4.3 程序流程圖………………………………………………25
4.4 算 例 …………………………………………………26
5. 總 結(jié) …………………………………………………………28
致 謝 ……………………………………………………………28
參考文獻(xiàn)  ………………………………………………………29
附 錄 ……………………………………………………………30