特高压交直流混联系统谐波特性研究

发布时间：2018-03-23 00:17

本文选题：谐波　切入点：特高压直流输电　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着电力电子技术广泛地应用于电力系统的各个方面,电力系统谐波早已成为电力系统电能质量的最重要的问题之一。并且随着电网的发展,直流输电的电压等级变得越来越高,大规模的直流输电工程接入交流电网中,使得谐波问题变得更为严峻。为了分析特高压直流系统接入交流电网中对交流电网可能带来的谐波问题,本文以哈密-郑州特高压直流系统接入河南省电网为背景,对可能发生的谐波问题进行了深入的探讨和研究。首先收集了河南省交流电网实际参数和特高压直流系统的设计参数,在PSCAD中搭建了河南省交直流混联系统的仿真模型。利用特高压直流输电系统的谐波稳定性判据分析了哈密-郑州直流输电系统接入河南省交流电网中的谐波稳定性问题。计算了特高压直流系统注入河南省电网的特征谐波分量大小,并分析了换流站交流侧滤波器的谐波滤除能力。其次,将换流器的阻抗频率特性推广至特高压直流系统,得到哈密-郑州特高压直流系统在河南省电网中的等值阻抗,使用该阻抗分析了换流站母线上的背景谐波的放大特性。最后,搭建所要研究节点的交流网络线路分布参数谐波模型,生成谐波导纳矩阵,通过计算得到特高压直流系统注入到交流系统中的谐波在关键节点引起的谐波电压畸变,并且讨论了河南省电网不同电压等级间的谐波传播系数。
[Abstract]:With the wide application of power electronic technology in all aspects of power system, power system harmonics have become one of the most important problems of power system power quality, and with the development of power grid, The voltage level of DC transmission becomes higher and higher, and the large-scale HVDC transmission project is connected to AC network, which makes the harmonic problem more serious. In order to analyze the harmonic problems that the UHV DC system may bring to the AC power network, the background of this paper is Hami Zhengzhou UHV DC system connected to Henan province power network. The possible harmonic problems are deeply discussed and studied. Firstly, the actual parameters and design parameters of UHV DC system in Henan province AC power network are collected. The simulation model of hybrid AC / DC system in Henan Province is built in PSCAD. The harmonic stability of Hami Zhengzhou DC transmission system connected to Henan AC network is analyzed by using the harmonic stability criterion of UHVDC transmission system. The characteristic harmonic components of the UHVDC system injected into Henan power network are calculated. The harmonic filtering ability of AC side filter in converter station is analyzed. Secondly, the impedance frequency characteristic of converter is extended to UHV DC system, and the equivalent impedance of Hami Zhengzhou UHV DC system in Henan power network is obtained. The impedance is used to analyze the amplification characteristics of background harmonics on the bus of converter station. Finally, the harmonic model of the AC network line distribution parameters is built to generate harmonic admittance matrix, and the harmonic voltage distortion caused by the harmonics injected into the AC system by the UHVDC system is obtained by calculating the harmonic voltage distortion caused by the harmonics injected into the AC system at the key nodes. The harmonic propagation coefficient between different voltage levels in Henan power network is also discussed.
【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】：TM721

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