本文選題：電氣制動力矩控制 + 繼電保護�。� 參考：《重慶大學》2014年碩士論文

【摘要】：單獨采用機械制動系統(tǒng)的水輪發(fā)電機組，當停機投入機械制動系統(tǒng)后主要依靠制動塊和制動環(huán)產(chǎn)生的摩擦力降低機組轉速至停車，制動塊在剎車過程中容易產(chǎn)生磨損并會釋放大量的粉塵，特別是對于頻繁起停的水輪發(fā)電機組，還可能因摩擦制動過程中產(chǎn)生的發(fā)熱導致制動環(huán)變形，制動環(huán)和制動塊的磨損情況也更為嚴重。因此對機組制動系統(tǒng)進行電氣制動的研究是很有必要的。 論文首先從電氣制動方法和電制動力矩控制兩個方面對水輪發(fā)電機組的電氣制動進行了全面的分析研究。論文針對三種不同電氣制動方法的特性及優(yōu)缺點，總結出不同電氣制動方法的應用場合；對電氣制動的電制動力矩進行了詳細的理論分析和公式推導，據(jù)此得到電氣制動兩個階段的控制方案，并繪制出制動電流及制動力矩隨轉速變化的特性曲線。 根據(jù)課題研究需要，論文還對電氣制動過程對繼電保護和電氣閉鎖控制的影響進行了分析。水電站內(nèi)受電氣制動過程影響的保護包括：發(fā)電機定子接地保護、發(fā)電機縱差保護、發(fā)電機負序電流保護、發(fā)電機誤上電保護和發(fā)電機-變壓器擴大單元繼電保護，論文還對機組電氣閉鎖控制風險進行了闡述，，針對分析情況，給出了相應的應對措施。 結合對本課題理論部分的研究和天生橋二級電站水輪發(fā)電機組電氣制動改造的需求，論文對該電站電氣制動改造的具體實施方案進行了詳盡的分析和闡述。從機組制動方式改造必要性、技術可行性、設計方案選擇以及主要設備選型等方面給出了該電站電氣制動系統(tǒng)改造的詳細分析；考慮電氣制動對電站繼電保護及電氣閉鎖控制的影響，結合天生橋二級電站的實際情況提出了對繼電保護影響的控制措施，并對電氣制動控制系統(tǒng)的風險進行評估，提出基于安全導向的自動控制策略和閉鎖邏輯原則。 本課題的研究成果可為今后大容量水輪發(fā)電機組的電氣制動設計和改造提供參考。
[Abstract]:When the hydrogenerator set with mechanical braking system is put into the mechanical braking system, it mainly depends on the friction produced by the brake block and the brake ring to reduce the speed of the unit to stop.Brake blocks are prone to wear and release a large amount of dust during the braking process, especially for hydro-generator sets that frequently start up and stop, and may also cause the brake ring deformation due to the heat generated during friction braking.The wear of brake ring and brake block is more serious.Therefore, it is necessary to study the electric braking system of the unit.In this paper, the electric braking method and the torque control of hydraulic turbine generator are analyzed and studied.According to the characteristics, advantages and disadvantages of three kinds of electric braking methods, the paper summarizes the application of different electric braking methods, and makes a detailed theoretical analysis and formula derivation of the electric braking torque.According to this, the control scheme of two stages of electric braking is obtained, and the characteristic curves of braking current and braking torque varying with rotational speed are plotted.According to the need of the research, the paper also analyzes the influence of the electric braking process on the relay protection and the electrical locking control.The protection affected by the electric braking process in hydropower station includes: generator stator grounding protection, generator longitudinal differential protection, generator negative sequence current protection, generator false power protection and generator transformer expansion unit relay protection.The paper also expounds the control risk of the electrical locking of the unit, and puts forward the corresponding countermeasures in the light of the analysis.Combined with the research of the theory part of this subject and the demand of the electric braking transformation of the hydroelectric turbine generator set of Tianshengqiao Hydropower Station, the specific implementation scheme of the electric braking reform of the power station is analyzed and expounded in detail.From the aspects of necessity, technical feasibility, selection of design scheme and selection of main equipment of the braking mode of the unit, the detailed analysis of the revamping of the electric braking system of the power station is given.Considering the influence of electric braking on relay protection and electrical lock control of power station, combined with the actual situation of Tianshengqiao secondary power station, the paper puts forward the control measures on the influence of relay protection, and evaluates the risk of electric braking control system.An automatic control strategy based on security guidance and the principle of locking logic are proposed.The research results of this paper can be used as a reference for the design and transformation of electric brake of large capacity hydroelectric generator.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV734.21

【參考文獻】

相關期刊論文 前10條

1 張英;李天智;;三峽左岸電站機組勵磁控制系統(tǒng)分析[J];水電自動化與大壩監(jiān)測;2007年02期

2 李強;陳遺志;仲e

本文編號：1756782