基于PSCAD的高温超导电缆仿真模型的研究

发布时间：2018-05-19 01:40

本文选题：高温超导电缆 + 失超　；参考：《华北电力大学》2014年硕士论文

【摘要】：高温超导电缆是解决电力系统输配电严峻现状的有效途径。低温环境下运行的高温超导电缆因受到系统过电流、冷却装置故障、电缆本体故障等各种扰动而失超时,电缆内会产生大量焦耳热,使其温度迅速上升,从而影响冷却装置乃至整个系统的安全运行。因此,对故障状态下的.高温超导电缆的热分析是电缆安全运行的保障,也是研究失超检测和失超保护的基础。本文从高温超导电缆的结构出发,归纳了高温超导电缆的失超特性和电磁理论与电磁参数,分析了高温超导带材的热特性,提出了高温超导电缆的暂态温度数学模型,并用Matlab和PSCAD软件进行了仿真分析。首先,归纳了高温超导电缆的材质特性,分析了影响电缆阻值的各个参数如临界电流、体积比热容、电阻率、热传导系数、带材n值等之间的非线性耦合关系,在热力学定律的基础之上提出了故障状态下高温超导电缆径向温度数学计算模型。然后,通过MATLAB软件对220kV高温超导电缆模型进行了暂态分析,主要分析了故障状态下高温超导电缆的温度分布以及电缆阻值随温度的变化函数。最后,在PSCAD中利用Fortran语言编写高温超导电缆模块组件,建立含有高温超导电缆模块组件的电力系统仿真模型。分析了高温超导电缆稳态和暂态运行下的电流分流情况；并通过对不同故障情况的仿真分析,得到了高温超导电缆各层的温度随运行时间的变化以及电缆各层电阻随运行时间的变化。还分析了高温超导电缆在三相短路情况下超导层与屏蔽层电流的幅值关系,为高温超导电缆的失超检测和失超保护奠定基础。两种仿真结果表明高温超导电缆超导层与屏蔽层温度在系统发生三相短路时瞬间增大,但随着故障的解除而减小；超导层与屏蔽层电阻在瞬间增大之后会随温度的增大而增大。验证了文中提出的电缆温度数学模型的可行性。
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75

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