本文選題：高溫超導(dǎo)電纜 + 失超��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：高溫超導(dǎo)電纜是解決電力系統(tǒng)輸配電嚴峻現(xiàn)狀的有效途徑。低溫環(huán)境下運行的高溫超導(dǎo)電纜因受到系統(tǒng)過電流、冷卻裝置故障、電纜本體故障等各種擾動而失超時,電纜內(nèi)會產(chǎn)生大量焦耳熱,使其溫度迅速上升,從而影響冷卻裝置乃至整個系統(tǒng)的安全運行。因此,對故障狀態(tài)下的.高溫超導(dǎo)電纜的熱分析是電纜安全運行的保障,也是研究失超檢測和失超保護的基礎(chǔ)。 本文從高溫超導(dǎo)電纜的結(jié)構(gòu)出發(fā),歸納了高溫超導(dǎo)電纜的失超特性和電磁理論與電磁參數(shù),分析了高溫超導(dǎo)帶材的熱特性,提出了高溫超導(dǎo)電纜的暫態(tài)溫度數(shù)學(xué)模型,并用Matlab和PSCAD軟件進行了仿真分析。 首先,歸納了高溫超導(dǎo)電纜的材質(zhì)特性,分析了影響電纜阻值的各個參數(shù)如臨界電流、體積比熱容、電阻率、熱傳導(dǎo)系數(shù)、帶材n值等之間的非線性耦合關(guān)系,在熱力學(xué)定律的基礎(chǔ)之上提出了故障狀態(tài)下高溫超導(dǎo)電纜徑向溫度數(shù)學(xué)計算模型。 然后,通過MATLAB軟件對220kV高溫超導(dǎo)電纜模型進行了暫態(tài)分析,主要分析了故障狀態(tài)下高溫超導(dǎo)電纜的溫度分布以及電纜阻值隨溫度的變化函數(shù)。 最后,在PSCAD中利用Fortran語言編寫高溫超導(dǎo)電纜模塊組件,建立含有高溫超導(dǎo)電纜模塊組件的電力系統(tǒng)仿真模型。分析了高溫超導(dǎo)電纜穩(wěn)態(tài)和暫態(tài)運行下的電流分流情況；并通過對不同故障情況的仿真分析,得到了高溫超導(dǎo)電纜各層的溫度隨運行時間的變化以及電纜各層電阻隨運行時間的變化。還分析了高溫超導(dǎo)電纜在三相短路情況下超導(dǎo)層與屏蔽層電流的幅值關(guān)系,為高溫超導(dǎo)電纜的失超檢測和失超保護奠定基礎(chǔ)。 兩種仿真結(jié)果表明高溫超導(dǎo)電纜超導(dǎo)層與屏蔽層溫度在系統(tǒng)發(fā)生三相短路時瞬間增大,但隨著故障的解除而減小；超導(dǎo)層與屏蔽層電阻在瞬間增大之后會隨溫度的增大而增大。驗證了文中提出的電纜溫度數(shù)學(xué)模型的可行性。
[Abstract]:HTS cable is an effective way to solve the serious situation of power transmission and distribution. High temperature superconducting cable running in low temperature environment is out of time due to various disturbances such as system overcurrent, cooling device failure, cable body fault and so on. A large amount of Joule heat will be produced in the cable, which will cause its temperature to rise rapidly. Thus, it affects the safe operation of the cooling device and even the whole system. Therefore, on the fault state. Thermal analysis of HTS cable is not only the guarantee of safe operation of HTS cable, but also the basis of research on overage detection and protection. Starting from the structure of HTS cable, this paper summarizes the characteristics of HTS cable loss, electromagnetic theory and electromagnetic parameters, analyzes the thermal characteristics of HTS tape, and puts forward the transient temperature mathematical model of HTS cable. The simulation analysis is carried out with Matlab and PSCAD software. Firstly, the material properties of HTS cable are summarized, and the nonlinear coupling relations between the parameters such as critical current, volume specific heat capacity, resistivity, heat conduction coefficient and n value of strip are analyzed. Based on the thermodynamic law, a mathematical model of radial temperature of HTS cable under fault condition is presented. Then, the transient analysis of 220kV HTS cable model is carried out by MATLAB software. The temperature distribution of HTS cable and the function of cable resistance with temperature are analyzed. Finally, the power system simulation model with HTS cable module is established by using Fortran language in PSCAD. The current shunt of HTS cable under steady and transient operation is analyzed, and the simulation results of different faults are given. The temperature of each layer of HTS cable varies with operation time and the resistance of each layer of HTS cable varies with operation time. The relationship between the current amplitude of the superconducting layer and the shield layer in the case of three-phase short circuit is also analyzed, which lays a foundation for the overage detection and protection of HTS cable. The two simulation results show that the temperature of the superconducting layer and shield layer of HTS cable increases instantly when the three-phase short circuit occurs, but decreases with the elimination of the fault, and the resistance of the superconducting layer and shield layer increases with the increase of temperature. The feasibility of the proposed mathematical model of cable temperature is verified.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM75

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相關(guān)期刊論文 前1條

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本文編號：1908161