發(fā)布時(shí)間：2018-03-09 08:12

  本文選題：回復(fù)電壓　切入點(diǎn)：變壓器　出處：《福州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本課題是在國(guó)家自然科學(xué)基金項(xiàng)目《基于電路分析法和恢復(fù)電壓響應(yīng)的油紙絕緣老化診斷方法》(基金編號(hào)為61174117)資助下提出的,以油紙絕緣變壓器的絕緣系統(tǒng)為主要研究對(duì)象,為了深入研究極化譜與回復(fù)電壓特征參數(shù)和變壓器絕緣狀態(tài)之間的關(guān)系,搭建計(jì)算機(jī)模型和制作模擬實(shí)驗(yàn)平臺(tái),完成大量的仿真和實(shí)驗(yàn),對(duì)油紙絕緣系統(tǒng)的回復(fù)電壓特性進(jìn)行探討,并將本文獲得的回復(fù)電壓診斷判據(jù)思路與實(shí)際測(cè)試結(jié)果相結(jié)合,相互佐證了利用回復(fù)電壓法對(duì)變壓器絕緣狀態(tài)診斷的可行性。因此,基于極化譜和回復(fù)電壓特征參數(shù)的絕緣狀態(tài)診斷法具有繼續(xù)深入的探索價(jià)值和廣泛的實(shí)際應(yīng)用前景。本文研究的主要工作在于：(1)以擴(kuò)展德拜介質(zhì)響應(yīng)模型為出發(fā)點(diǎn),對(duì)如何準(zhǔn)確辨識(shí)模型參數(shù)進(jìn)行研究,首次在該參數(shù)辨識(shí)中引入分層思路,并提出分層粒子群優(yōu)化算法,實(shí)現(xiàn)基于回復(fù)電壓現(xiàn)場(chǎng)測(cè)試數(shù)據(jù)的等值模型參數(shù)辨識(shí),通過與未改進(jìn)的粒子群優(yōu)化算法對(duì)比分析可知,其具有使用靈活、精確高效等特點(diǎn)。(2)在介質(zhì)響應(yīng)等值電路模型和參數(shù)辨識(shí)的基礎(chǔ)上,仿真研究絕緣狀態(tài)、極化譜、回復(fù)電壓特征參數(shù)和等值模型參數(shù)之間的內(nèi)在聯(lián)系,并提出模型支路數(shù)與絕緣狀態(tài)之間的對(duì)應(yīng)關(guān)系,即絕緣狀態(tài)越差,引用模型支路數(shù)則應(yīng)有所增加；成功通過等值模型對(duì)回復(fù)電壓極化譜的非標(biāo)準(zhǔn)化進(jìn)行了仿真,揭示絕緣狀態(tài)造成非標(biāo)準(zhǔn)極化譜的內(nèi)部影響因素,提出對(duì)非標(biāo)準(zhǔn)極化譜的模型辨識(shí)研究思路。(3)根據(jù)實(shí)際油紙絕緣變壓器絕緣結(jié)構(gòu),提出“Ⅱ”型模擬絕緣系統(tǒng),基于模擬實(shí)驗(yàn)平臺(tái),實(shí)驗(yàn)研究了充電電壓、充放電時(shí)間比等外設(shè)取值對(duì)測(cè)試數(shù)據(jù)的影響,并從水分、紙老化、絕緣紙層數(shù)和氣隙(氣泡)出發(fā),進(jìn)行了回復(fù)電壓特性分析,目前運(yùn)用回復(fù)電壓法對(duì)含氣隙的絕緣系統(tǒng)的研究還未見其他學(xué)者有所涉及,所以該研究方向具有一定的研究?jī)r(jià)值。(4)將現(xiàn)場(chǎng)測(cè)試結(jié)果與本文研究所得的絕緣診斷思路相結(jié)合,提出根據(jù)極化譜、回復(fù)電壓峰值時(shí)間和初始斜率三者綜合考量的診斷理念,具體項(xiàng)目如下：a)對(duì)相同電壓等級(jí)不同容量的油紙絕緣變壓器進(jìn)行現(xiàn)場(chǎng)測(cè)試,提出容量接近的變壓器測(cè)試數(shù)據(jù)才具有可比性；b)根據(jù)實(shí)際變壓器不同絕緣狀態(tài)下獲取的極化譜和特征參數(shù),提出該法可用于具體故障相的精確判別；c)根據(jù)現(xiàn)場(chǎng)測(cè)試,說明模型支路數(shù)確與絕緣狀態(tài)具有相關(guān)性；d)首次將實(shí)際測(cè)試所得的非標(biāo)準(zhǔn)極化譜成功用于建立等值模型,并指出局部受潮是其非標(biāo)準(zhǔn)化的原因之一。
[Abstract]:This subject is proposed under the project of National Natural Science Foundation of China, "diagnosis method of Oil-Paper Insulation Aging based on Circuit Analysis and recovery Voltage response" (fund number 61174117). The main research object is the insulation system of oil-paper insulated transformer. In order to deeply study the relationship between polarization spectrum and characteristic parameters of recovery voltage and insulation state of transformer, computer model and simulation experiment platform are built, and a large number of simulations and experiments are completed. The characteristics of recovery voltage of oil-paper insulation system are discussed, and the diagnostic criterion of recovery voltage obtained in this paper is combined with the actual test results, which proves the feasibility of diagnosing the insulation state of transformers by the method of recovery voltage. The insulation state diagnosis method based on polarization spectrum and recovery voltage characteristic parameters has further exploration value and wide application prospect. The main work of this paper is to expand the Debye medium response model. This paper studies how to identify the model parameters accurately, introduces the delamination idea into the parameter identification for the first time, and puts forward the layered particle swarm optimization algorithm to realize the equivalent model parameter identification based on the field test data of the recovery voltage. By comparing with the unimproved particle swarm optimization algorithm, it can be seen that it has the characteristics of flexibility, accuracy and high efficiency. On the basis of the equivalent circuit model of dielectric response and parameter identification, the insulation state and polarization spectrum are simulated and studied. The relationship between the characteristic parameters of the recovery voltage and the equivalent model parameters is put forward, and the corresponding relationship between the number of the model branches and the insulation state is put forward, that is, the worse the insulation state, the more the number of the quoting model branches should be increased. The non-standardization of the reverse-voltage polarization spectrum is successfully simulated by the equivalent model, and the internal influence factors of the non-standard polarization spectrum caused by the insulation state are revealed. According to the insulation structure of oil-paper insulated transformer, the "鈪，

本文編號(hào)：1587705