【摘要】：在多種發(fā)電形式和交直流聯(lián)合輸電主體結(jié)構(gòu)下,電網(wǎng)電能質(zhì)量諧波污染日益惡化。對于交直流互聯(lián)電網(wǎng)的諧波問題,國內(nèi)外許多專家學(xué)者從不同方面做了分析與研究,取得了突破性進(jìn)展。目前亟待解決的難題是如何以實(shí)測數(shù)據(jù)為依托建立準(zhǔn)確可靠的仿真模型,使計(jì)算值能夠反映實(shí)測值,進(jìn)而達(dá)到把握全電網(wǎng)諧波特性、提供濾波器設(shè)計(jì)所需數(shù)據(jù)依據(jù)的目的。本文的研究手段可概括為:1)通過對直流線路穩(wěn)定運(yùn)行和檢修期間全過程諧波的測試,分析交直流電網(wǎng)諧波特性及其主要影響因素,總結(jié)諧波的傳遞規(guī)律,并通過對實(shí)測數(shù)據(jù)的提煉分析給出適合計(jì)算軟件的電網(wǎng)諧波源模型和諧波源數(shù)據(jù)。2)以ETAP軟件進(jìn)行電網(wǎng)建模,將建立的諧波源注入到等值模型中,采用仿真分析的方法,對比仿真計(jì)算值與實(shí)測值,驗(yàn)證模型的準(zhǔn)確可靠性。3)在電網(wǎng)直流不同運(yùn)行方式下,計(jì)算寧夏電網(wǎng)750k V雙環(huán)網(wǎng)的諧波值,并對比換流站330k V交流側(cè)和主變750k V的諧波情況,以實(shí)現(xiàn)對電網(wǎng)諧波分布的全面把握,在這個背景下,計(jì)算出規(guī)劃網(wǎng)架下的上海廟直流母線側(cè)諧波水平,為上海廟直流輸電工程交流濾波器的設(shè)計(jì)提供背景諧波依據(jù)。本文的研究成果可總結(jié)為:1)實(shí)測數(shù)據(jù)分析,寧夏電網(wǎng)以5次諧波為主導(dǎo),銀川東主變750k V和330k V側(cè)3、7、11、13次諧波含量較大,換流變330k V側(cè)11、13、23、25次諧波含量較大;直流線路穩(wěn)定運(yùn)行時(shí),主變側(cè)的特征諧波幅值增減規(guī)律相同;直流檢修時(shí),5、7次諧波含量較小,12脈動換流變壓器對6k±1次諧波具有抵消的作用。2)以ETAP仿真軟件為平臺,形成以寧夏電網(wǎng)750k V雙環(huán)網(wǎng)為主網(wǎng)架的計(jì)算等值模型,通過對仿真模型潮流進(jìn)行調(diào)試和測試,使其更加適合不同情況下的諧波潮流計(jì)算,計(jì)算值與實(shí)測值一致,得出可靠的電網(wǎng)諧波仿真計(jì)算模型。3)基于等值模型,改變直流運(yùn)行方式,計(jì)算得出無直流時(shí)電網(wǎng)諧波畸變率較大,各次諧波幅值也較大;一條直流運(yùn)行時(shí),電網(wǎng)諧波畸變率較小,各次諧波的幅值也較小;兩條直流時(shí)電網(wǎng)諧波含量較一條直流時(shí)更小。這是由直流配套電源的接入,系統(tǒng)短路容量的增大引起的。4)計(jì)算得出上海廟直流輸電工程的背景諧波水平,并在此基礎(chǔ)上,給出500 k V母線側(cè)推薦值來供設(shè)計(jì)單位在交流濾波器的設(shè)計(jì)中采用。
[Abstract]:Under various forms of generation and the main structure of AC-DC combined transmission, harmonic pollution of power quality of power network is worsening day by day. Many experts and scholars at home and abroad have made analysis and research on harmonics of AC / DC interconnected power network from different aspects, and have made breakthrough progress. At present, the problem to be solved is how to build an accurate and reliable simulation model based on the measured data, so that the calculated value can reflect the measured value, and then achieve the purpose of grasping the harmonic characteristics of the whole power network and providing the data basis for the filter design. The research means of this paper can be summarized as follows: (1) by testing the harmonics in the whole process during the steady operation and maintenance of DC lines, the harmonic characteristics of AC / DC power network and its main influencing factors are analyzed, and the law of harmonic transmission is summarized. Based on the analysis of the measured data, the harmonic source model and harmonic source data of the power network are presented. The ETAP software is used to model the power network. The harmonic source is injected into the equivalent model, and the simulation analysis method is adopted. By comparing the calculated value with the measured value, the accuracy and reliability of the model is verified. 3) under different operation modes of DC network, the harmonic value of 750kV double loop network of Ningxia power network is calculated, and the harmonics of 330kV AC side and 750kV main transformer are compared. In order to realize the overall understanding of the harmonic distribution of the power network, the harmonic level of the DC bus side of the Shanghai Temple under the planning grid is calculated under this background, which provides the background harmonic basis for the design of the AC filter for the Shanghaimiao HVDC transmission project. The research results of this paper can be summarized as follows: (1) Analysis of measured data shows that Ningxia power grid is dominated by the fifth harmonic wave, the East main Transformer of Yinchuan has a larger harmonic content of 750kV and 330kV sides, and the 310kV side has a larger harmonic content of 25 times, while the DC line is in stable operation. The amplitude of characteristic harmonics in the main transformer side is the same as that in the main transformer side, and the seventh harmonic content is smaller than that of the 12 pulsating converter transformer when the DC is overhauled. 2) based on the ETAP simulation software, the amplitude of the characteristic harmonics of the main transformer side is equal to that of the 6k 鹵1 th harmonic wave. The equivalent model of 750kV double loop network in Ningxia power network is formed. By debugging and testing the simulation model power flow, it is more suitable for harmonic power flow calculation under different conditions, and the calculated value is consistent with the measured value. The reliable harmonic simulation calculation model .3) based on the equivalent model, changes the DC operation mode, and calculates that the harmonic distortion rate is larger and the harmonic amplitude is larger when the DC is not in operation. The harmonic distortion rate of power network is smaller and the amplitude of each harmonic is smaller. This is caused by the connection of the DC power supply and the increase of the short-circuit capacity of the system.) the background harmonic level of the Shanghaimiao HVDC transmission project is calculated, and on this basis, The recommended value of 500 kV bus side is given for the design unit to adopt in the design of AC filter.
【學(xué)位授予單位】：北方民族大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM711

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本文編號：2151516