专业外语期末考核
班级：电气工程及其自动化1班
姓名：符志勇
    学号：P1*******5
1 、Translate the following paragraphs into English. (50 points)
变压器式可控电抗器（Controllable Reactor of Transformer Type，简称CRT完成字符串是什么）是可控并联电抗器的一种，它具有容量大、能够实现快速平滑调节；谐波含量少；提高电网输电能力和电压水平；改善潮流分布；抑制工频过电压和潜供电流；提高系统稳定性；提高输电经济效益等特点。本文致力于研究如何将CRT应用于特高压交流输电线路，以及装设CRT前后特高压输电线路的运行特性。
本文分析了特高压输电线路的四个原参数，并通过将试验数值法与按导线排列方式计算的传统方法相结合推导出了单位长度输电线路电导的计算公式。以单位长度特高压输电线路的等值电路为基础，本文推导得出了精确考虑分布参数特性的特高压长距离输电线路∏形等值电路的参数计算公式，并在MATLAB/SimPower Systems中构建其仿真模型。详细分析了未装设CRT的特高压输电线路上沿线电压、电流以及工频过电压、无功功率等线路运行特性。
本文以均匀传输线方程为基础，采用电力系统潮流计算法得到适用于特高压输电线路（计及R和G）受端系统各种负载类型的可控电抗器补偿度公式，同时推导得出了输电线路传输功率的公式。重点分析了可控电抗器补偿度与线路传输功率、首末端电压、线路长度等之间的关系。分析了可控电抗器在特高压输电线路上的安装位置及容量，并对装设距离进行了详细的分析和计算。
在分析CRT工作原理的基础上，依照特高压输电线路的实际参数及CRT的参数计算流程图来编写M文件程序，从而得到了CRT仿真模型所需的基本参数，构建了CRT的仿真模型。对CRT顺次单支路工作方式进行了分析，并依据其工作特性设计CRT的自动控制系统，最终搭建了首末端装设CRT的特高压交流输电线路的仿真系统。
通过计算和仿真分析对装设CRT之后的特高压交流输电线路的运行特性进行详细的分析和研究，包括特高压交流输电线路工频过电压、无功功率以及装设可控电抗器后如何抑制线路的潜供电流等。最终在所编程序软件包和仿真模型的基础上，建立了采用可控电抗器的特高压交流输电系统运行特性研究的图形用户界面，并采用特高压输电工程实例进行了应用分析。
Transformers controllable controllable shunt reactor is a reactor, it has a large capacity, can achieve rapid and smooth adjustment of less harmonic content; improve transmission capacity and voltage levels to improve flow distribution; suppress power frequency overvoltage and latent power flow and improve the stability of the system, and improve economic efficiency transmission and so on. This article focuses on how CRT before and after the installation of UHV transmission lines applicable CRT UHV AC transmission lines, and operating characteristics.
This paper analyzes the four main UHV transmission line parameters and formulas to calculate the conventional method of numerical test methods and results based on UHV transmission line equivalent circuit unit length per unit length of the transmission line arrang
ed by conductor combination of conductance G ,this paper derived the accurate considering distributed parameter characteristic of UHV long distance transmission lines ∏ shape parameter calculation formula of the equivalent circuit, and in the MATLAB/ Sim Power Systems to build the simulation model. A detailed analysis of the did not install the CRT UHV transmission line voltage, current and the power frequency overvoltage, reactive power line operating characteristics.
In this paper, based on the uniform transmission line equation, the power system flow calculation method is adopted to get suitable for UHV transmission lines (meter and R and G) by the end of the compensation system of various load type controlled reactor degree formula, and derived the formula of transmission power of transmission line. Focused  its  analysis on controllable reactor of compensation and transmission power, the voltage at the end of the line, such as line length between the relationships. Analysis of the controllable reactor in UHV transmission lines on the installation location and capacity, and the installation distance are analyzed and calculated in detail.
In the analysis of the CRT works, according to the actual parameters of UHV transmission line parameters and calculate the flow chart CRT M file written procedures to obtain the necessary CRT-based simulation model of the basic parameters, the simulation model was constructed CRT. To CRT in order single branch works are analyzed, and according to the working characteristic design of CRT automatic control system, and finally set up the first installed CRT of UHV ac transmission lines at the end of the simulation system.
A detailed analysis and research through the analysis of the calculation and the simulation operation characteristics of UHV AC transmission line on the installation of CRT, including the UHV AC transmission line power frequency overvoltage, reactive power and the installation of the controllable reactor to suppress line arc current. Eventually in the programming software and simulation model, on the basis of established adopting controllable reactor of UHV ac transmission system operating characteristics research of the graphical user interface, And using UHV instance application analysis.
2 Writing (50 points)
Directions: For this part, you are asked to write an abstract entitled with Research on Reactive Power Optimization of Power System Based on Genetic Algorithm . You should write at least 120 words and you should base your abstract on the outline below:
1、Rational distribution of reactive power in power system and the role of optimization adjustment of reactive power
2、The reason why genetic algorithm solve reactive power optimization problem
Reactive Power Optimization of Power System Genetic Algorithm Based
Reactive Power Optimization refers to various operating under the premise constraints assurance system to determine the best locations and reactive power compensation capacity of reactive power compensation equipment to ensure as little reactive power compensation equipment investment, maximizing improve the voltage stability of the system, improve voltage quality and reduce network losses reactive voltage optimization can effectively improve the security of power system operation and economic interests.
Genetic algorithm is applied to reactive power optimization problem, can be understood as follows: an initial set of flow power system environment, subject to a variety of constraints, the advantages and disadvantages evaluated by an objective function, Recalling abandoned low-value, the only chance , which is characterized by a high value for the next iteration of a solution, the final optimization.

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