本文選題：并聯(lián)電容器組 + 暫態(tài)過電壓　； 參考：《大連理工大學》2015年碩士論文

【摘要】：電力系統(tǒng)的基本功能是要為用戶供應優(yōu)質(zhì)、安全并且盡可能經(jīng)濟的電能,電力系統(tǒng)安全穩(wěn)定運行取決于其各個組成部分的可靠運行。電力電容器是變電站中的基本設備,主要作用是控制無功潮流和功率因數(shù)來進行無功補償。電力電容器由于需要頻繁的操作,所以其在電網(wǎng)運行中發(fā)揮重要的作用,變電站電容器設備故障會嚴重威脅整個電網(wǎng)的穩(wěn)定運行和用戶生產(chǎn)生活。所以從用戶和生產(chǎn)的角度來調(diào)查并分析電容器的故障模式,可靠性水平,故障原因和機制非常重要。本文對變電站10kv并聯(lián)電容器故障原因以及保護方案進行了一系列研究來加強電力電容器應用的可靠性。本文有針對性的研究導致電容器故障的兩個電網(wǎng)運行因素：暫態(tài)過電壓和諧波電流。首先以大連某變電站10kV母線并聯(lián)電容器組為分析平臺結(jié)合現(xiàn)場電容器組的運行方式和變電站參數(shù)建立仿真模型,在對電容器投切過程進行充分理論分析的基礎上,運用選擇性暫態(tài)程序軟件(ATP)對電容器投切過程進行仿真分析,給出電容器組分合閘操作時暫態(tài)過電壓、過電流波形,分析其在不同因素改變下的變化規(guī)律。然后依據(jù)變電站的實際運行情況,建立了諧波分析等效模型,從理論上對諧波等效電路進行了分析,研究各次諧波導致諧波電流諧振放大的規(guī)律,討論了串聯(lián)電抗器對諧波放大的影響,并給出變電站的現(xiàn)場諧波參數(shù)測試結(jié)果。在故障原因分析的基礎上,本文設計分析了兩種相對應的保護方法：(1)采用可調(diào)串聯(lián)電抗器。本文分析了合、分閘操作暫態(tài)過程和諧波放大過程中串聯(lián)電抗器的作用,提出了串聯(lián)可調(diào)式電抗器的方案來解決電抗器參數(shù)配置問題。(2)使用晶閘管投切電容器。本文提出利用晶閘管控制電容器的投切進行無功補償?shù)姆桨?實現(xiàn)在滿足投、切條件的情況下無暫態(tài)投切過程,并通過MATLAB建立仿真。模型驗證其可行性。
[Abstract]:The basic function of power system is to supply high quality, safe and economical electric energy to users. The safe and stable operation of power system depends on the reliable operation of each component of power system. Power capacitor is the basic equipment in substation. The main function is to control reactive power flow and power factor to compensate reactive power. Power capacitors need to be operated frequently, so they play an important role in the operation of power grid. The fault of capacitor equipment in substation will seriously threaten the stable operation of the whole power network and the production and life of users. Therefore, it is very important to investigate and analyze the fault mode, reliability level, fault cause and mechanism of capacitor from the point of view of user and production. In this paper, the fault cause and protection scheme of 10kv shunt capacitor in substation are studied to enhance the reliability of power capacitor application. In this paper, two operation factors of capacitor fault, transient overvoltage and harmonic current, are studied. Based on the analysis platform of 10 kV busbar shunt capacitor bank in a substation in Dalian, the simulation model is established based on the operation mode of field capacitor bank and substation parameters, and based on the theoretical analysis of the switching process of capacitor. The selective transient program software (ATP) was used to simulate and analyze the switching process of capacitors. The transient overvoltage and overcurrent waveforms were obtained when the components of capacitors were switched on and off. The variation rules of the transient overvoltage and overcurrent were analyzed under the change of different factors. Then according to the actual operation of the substation, the equivalent harmonic analysis model is established, the harmonic equivalent circuit is analyzed theoretically, and the law of harmonic current resonant amplification caused by each harmonic wave is studied. The effect of series reactor on harmonic amplification is discussed, and the measurement results of harmonic parameters in substation are given. On the basis of fault cause analysis, two corresponding protection methods are designed and analyzed: (1) adjustable series reactor is adopted. This paper analyzes the function of series reactor in the transient process of closing and opening operation and the process of harmonic amplification, and puts forward a scheme of series adjustable reactor to solve the problem of configuration of reactor parameters. (2) Thyristor switching capacitor is used. In this paper, a scheme of reactive power compensation with thyristor controlled capacitor switching is proposed to realize the no-transient switching process when the switching and switching conditions are satisfied, and the simulation is established by MATLAB. The model verifies its feasibility.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM531.4

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本文編號：2090233