【文章內容簡介】 諧振接地方式的運行特性進行了研究和介紹。從限制故障接地電弧的危害出發(fā)，重點論述如何利用電流諧振原理，有效熄滅故障接地電弧等。接著，本文結合國內外科技的發(fā)展和創(chuàng)新成果，對諧振接地優(yōu)化方式中的微機接地保護性和自動跟蹤補償裝置進行全面的分析與論述，說明諧振接地優(yōu)化方式在供電可靠性、人身安全、設備安全和通信干擾等方面，具有較好的運行特性，既解決了小電流接地系統(tǒng)接地保護的選擇 性，又實現(xiàn)了自動調諧，使此種接地方式成為配電網(wǎng)比較理想的中性點接地方式。本文同時還對諧振接地方式實施技術進行了研究，包括消弧線圈的參數(shù)選擇、安裝、調整、運行與維護等內容。 最后，本文總結了本課題研究的內容。諧振接地籍助微機技術的支持，近些年來國內外均在進行優(yōu)化，優(yōu)化諧振接地技術是提高供電可靠性、保護人身安全、設備安全和電磁環(huán)境等的一項合理的重要技術手段，而諧振接地實施技術更充分發(fā)揮諧振接地方式的功能，使諧振接地方式具有更好的技術經(jīng)濟指標。隨著電網(wǎng)的不斷發(fā)展和豐富的實踐結果表明，以諧振接地方式為代表的小電流接 地方式優(yōu)于其他接地方式，這是配電網(wǎng)的中性點接地方式發(fā)展的總趨勢，在今后的配電網(wǎng)接地方式中應推廣應用。 本論文提出的思路、方案和結論不僅對于 lOkV配電網(wǎng)中性點接地方式選擇研究、實際工程應用具有實際的參考作用，對于其他電壓等級中性點接地方式選擇同樣具有借鑒的作用。 電力系統(tǒng)的基本功能是向用戶輸送電能。 lOkV 配電網(wǎng)是連接供電電源與工業(yè)、商業(yè)及生活用電的樞紐，其網(wǎng)絡龐大及復雜。對于所有用戶都期望以最低的價格買到具有高度可靠性的電能。然而，經(jīng)濟性與可靠性這兩個因素是互相矛盾的。要提高供電網(wǎng)絡的可靠性就必須增加網(wǎng)絡 建設投資成本。但是，如果提高可靠性使用戶停電損失的降低小于用于提高可靠性所增加的投資，那么這種建設投資就沒有價值了。通過計算電網(wǎng)的投資和用戶停電的損失，最終可找到一個平衡點，使投資和損失的綜合經(jīng)濟性最優(yōu)。論文針對配電網(wǎng)各種接線模式的特點，就各種接線模式的經(jīng)濟性和可靠性進行了分析。 論文首先介紹 lOkV配電網(wǎng)各種典型的接線模式和國外幾個國家的典型接線模式，然后確定配電網(wǎng)接線模式分析的思路，明確進行分析的必要性和重要性。再提出最優(yōu)分段數(shù)計算的必要性，闡述最優(yōu)分段數(shù)對經(jīng)濟性和可靠性的影響，然后建立最優(yōu)分段數(shù)計算模 型，并簡單介紹各種接線模式的供電方案。而后對配電網(wǎng)各種接線模式的可靠性和經(jīng)濟性進行了計算和分析，通過計算并描繪的各種圖表。并對最優(yōu)分段數(shù)作了分析和討論。文章最后對各種接線模式的經(jīng)濟性和可靠性進行總結，分析了各種接線模式各自的優(yōu)點和缺點，其適用情況。并結合實際情況針對 lOkV 配電網(wǎng)的規(guī)劃和建設提出有益的建議。為 lOkV 配電網(wǎng)的規(guī)劃設計及為建成網(wǎng)架堅實、布局合理、管理科學、能夠安全、優(yōu)質、高效運行的配電網(wǎng)提供理論的依據(jù)和有益的指引。 Power Supply and Distribution System The revolution of electric power system has brought a new big round construction,which is pushing the greater revolution of electric power technique along with the application of new technique and advanced equipment. Especially, the bination of the information technique and electric power technique, to great ex tent, has improved reliability on electric quality and electric supply. The technical development decreases the cost on electric construction and drives innovation of electric work. On the basis of national and internatio nal advanced electric knowledge, the dissertation introduces the research hotspot for present electric power sy etem as following. Firstly, This dissertation introduces the building condition of distribution automation(DA), and brings forward two typical construction modes on DA construction, integrative mode and fission mode .It emphasize the DA structure under the condition of the fission mode and presents the system configuration, the main station scheme, the feeder scheme, the optimized munication scheme etc., which is for DA research reference. Secondly, as for the (DA) trouble measurement, position, isolation and resume, This dissertation analyzes the changes of pressure and current for line problem, gets math equation by educing phase short circuit and problem position under the condition of singlephase and works out equation and several parameter s Uamp。 , s Iamp。 and e Iamp。 table on problem . It brings out optimized isolation and resume plan, realizes auto isolation and work reconstruction, reduces the power off range and time and improves the reliability of electric power supply through problem self diagnoses and selfanalysis. It also introduces software flow and use for problem judgement and sets a model on work reconstruction and puter flow. Thirdly, electricity system state is estimated to be one of the key techniques in DA realization. The dissertation remends the resolvent of bad measurement data and structure mistake on the ground of describing state estimate way. It also advances a practical test and judging way on topology mistake in state estimate about bad data test and abnormity in state estimate as well as the problem and effect on bad data from state measure to state estimate .As for real time monitor and control problem, the dissertation introduces a new way to solve them by electricity break and exceptional analysis, and the way has been tested in Weifang DA. Fourthly, about the difficulty for building the model of load forecasting, big parameter sc