本文選題：諧波　切入點(diǎn)：特高壓直流輸電　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電力電子技術(shù)廣泛地應(yīng)用于電力系統(tǒng)的各個(gè)方面,電力系統(tǒng)諧波早已成為電力系統(tǒng)電能質(zhì)量的最重要的問題之一。并且隨著電網(wǎng)的發(fā)展,直流輸電的電壓等級(jí)變得越來越高,大規(guī)模的直流輸電工程接入交流電網(wǎng)中,使得諧波問題變得更為嚴(yán)峻。 為了分析特高壓直流系統(tǒng)接入交流電網(wǎng)中對(duì)交流電網(wǎng)可能帶來的諧波問題,本文以哈密-鄭州特高壓直流系統(tǒng)接入河南省電網(wǎng)為背景,對(duì)可能發(fā)生的諧波問題進(jìn)行了深入的探討和研究。 首先收集了河南省交流電網(wǎng)實(shí)際參數(shù)和特高壓直流系統(tǒng)的設(shè)計(jì)參數(shù),在PSCAD中搭建了河南省交直流混聯(lián)系統(tǒng)的仿真模型。利用特高壓直流輸電系統(tǒng)的諧波穩(wěn)定性判據(jù)分析了哈密-鄭州直流輸電系統(tǒng)接入河南省交流電網(wǎng)中的諧波穩(wěn)定性問題。計(jì)算了特高壓直流系統(tǒng)注入河南省電網(wǎng)的特征諧波分量大小,并分析了換流站交流側(cè)濾波器的諧波濾除能力。 其次,將換流器的阻抗頻率特性推廣至特高壓直流系統(tǒng),得到哈密-鄭州特高壓直流系統(tǒng)在河南省電網(wǎng)中的等值阻抗,使用該阻抗分析了換流站母線上的背景諧波的放大特性。 最后,搭建所要研究節(jié)點(diǎn)的交流網(wǎng)絡(luò)線路分布參數(shù)諧波模型,生成諧波導(dǎo)納矩陣,通過計(jì)算得到特高壓直流系統(tǒng)注入到交流系統(tǒng)中的諧波在關(guān)鍵節(jié)點(diǎn)引起的諧波電壓畸變,并且討論了河南省電網(wǎng)不同電壓等級(jí)間的諧波傳播系數(shù)。
[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.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM721

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本文編號(hào)：1651049