谐波在输电线路中的传播特性研究

发布时间：2018-04-24 12:30

本文选题：输电线路 + 频变参数　；参考：《西安科技大学》2017年硕士论文

【摘要】：非线性电气设备在电力系统中的大量使用,造成输电线路中的谐波含量增多,严重危害输电网的安全运行。因此,研究谐波在输电线路中的传播特性能够为线路上的谐波治理提供理论支持。针对不同次谐波会对输电线路参数造成不同影响的问题。根据卡松算法和大地回路修正理论,得到输电线路频变参数矩阵。由于架空地线接地方式会影响线路频变参数,本文研究了三种接地方式下消去地线的方法,计算出消去地线后的频变参数矩阵,通过MATLAB编写相关程序进行验证。考虑到谐波在输电线路中的传播特性,需要建立合适的线路谐波模型;因此,本文对线路Bergeron模型及JMarti模型进行深入的研究,从等效方法、时域与复频域变换、仿真验证等方面对两种线路模型进行了对比分析,可知将JMarti模型作为线路谐波模型来研究谐波在输电线路中的传播特性更加准确。通过研究谐波传递系数来分析谐波在线路中的传输特性。在空载和负载两种情况下,分别对谐波传递系数进行理论推导,并进行了仿真验证。考虑了可能对谐波传递系数造成影响的因素,主要包括线路长度、谐波次数、负载类型等,通过搭建线路谐波模型进行仿真,分别得出各个因素的影响结果。根据陕南实际输电网结构参数,通过ATP建立了仿真模型,研究了输电系统中各个节点的谐波电流及谐波电压越限问题,为陕南输电网的总体谐波治理提供了理论依据。
[Abstract]:The large amount of use of nonlinear electrical equipment in the power system causes the increase of harmonic content in the transmission line, which seriously endangering the safe operation of the transmission network. Therefore, the study of the propagation characteristics of the harmonic in the transmission line can provide theoretical support for the harmonic control on the transmission lines. According to the Carson algorithm and the earth loop correction theory, the frequency variable parameter matrix of the transmission line is obtained. Because the overhead ground line grounding mode will affect the frequency parameter of the line, this paper studies the method of eliminating the ground line under three grounding modes, calculates the frequency parameter matrix after eliminating the ground line, and writes the related program through MATLAB to perform the test. In view of the propagation characteristics of harmonics in transmission lines, it is necessary to establish a suitable line harmonic model. Therefore, this paper makes a thorough study of the line Bergeron model and the JMarti model, and compares the two line models from the equivalent method, the time domain and the complex frequency domain transformation, and the simulation verification. It can be known that the JMarti model is used as the model. The harmonic model of the line is used to study the propagation characteristics of harmonics in transmission lines more accurately. Through the study of harmonic transfer coefficients, the transmission characteristics of harmonics in the transmission lines are analyzed. The harmonic transfer coefficients are theoretically derived in two cases of no-load and load, and the simulation verification is carried out. The influence factors mainly include line length, harmonic frequency, load type and so on. Through building the line harmonic model to simulate the impact of each factor. According to the actual transmission network structure parameters in southern Shaanxi, the simulation model is established through ATP, and the harmonic current and the harmonic voltage limit of each node in the transmission system are studied. It provides a theoretical basis for the overall harmonic control of the transmission network in southern Shaanxi.

【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM711

【参考文献】