【摘要】：良好的電能質(zhì)量是保證民航機場電力設(shè)施和用電設(shè)備安全、可靠運行的基礎(chǔ)。伴隨機場規(guī)模的擴大和數(shù)量的增加,減少機場電能損耗,對機場采取必要的節(jié)能減排措施已勢在必行,機場的諧波治理及無功補償是保證電能質(zhì)量和節(jié)能減排的關(guān)鍵。首先介紹了諧波和無功功率的基礎(chǔ)理論,分析了機場三大類供電系統(tǒng):阻感負載整流電路、帶濾波電容整流電路和交流調(diào)壓電路的特點,建立了諧波模型分析了功率因數(shù)。其次,在結(jié)合機場供電系統(tǒng)諧波特點的基礎(chǔ)上,選擇了自適應(yīng)的諧波檢測算法經(jīng)驗模式分解(EMD),針對其在諧波檢測過程中易產(chǎn)生模態(tài)混疊影響精度的問題,提出一種頻率約束的經(jīng)驗模態(tài)分解算法,通過對固有模態(tài)函數(shù)中零點分布加以頻率約束并重新設(shè)計固有模態(tài)函數(shù)的篩分準則,減小了模態(tài)混疊的概率,還實現(xiàn)了電網(wǎng)中特定次諧波的檢測。將本文方法與傳統(tǒng)EMD法、p-q法進行諧波檢測仿真和實測數(shù)據(jù)實驗,本文方法能夠克服傳統(tǒng)經(jīng)驗模式分解中存在的模態(tài)混疊問題,與p-q法相比,在檢測精度以及基波電流相位的一致性方面都優(yōu)于p-q法,能實現(xiàn)電網(wǎng)諧波檢測且具有很好的精度。最后,在SIMULINK環(huán)境下搭建了三相5H橋級聯(lián)的SVG仿真環(huán)境,選取了控制策略,分析了變流性負載在無功補償系統(tǒng)的靜態(tài)響應(yīng)和動態(tài)響應(yīng)特性,分別對阻感性負載在三相平衡和不平衡對電網(wǎng)做了補償實驗,補償后電網(wǎng)的電能質(zhì)量明顯提高。
[Abstract]:Good power quality is the basis to ensure the safe and reliable operation of civil aviation airport power facilities and equipment. With the expansion of the airport scale and the increase of the number, it is imperative to take necessary energy saving and emission reduction measures to reduce the power loss of the airport. The harmonic control and reactive power compensation of the airport is the key to ensure the power quality and energy saving and emission reduction. Firstly, the basic theory of harmonic and reactive power is introduced, and the characteristics of three kinds of power supply system in airport are analyzed: resistive load rectifier circuit, rectifier circuit with filter capacitor and AC voltage regulating circuit, and the harmonic model is established to analyze the power factor. Secondly, based on the harmonic characteristics of the power supply system in the airport, the empirical mode decomposition (EMD),) algorithm of adaptive harmonic detection is selected to solve the problem that modal aliasing is easy to affect the accuracy of harmonic detection. An empirical mode decomposition algorithm with frequency constraints is proposed. The probability of modal aliasing is reduced by applying frequency constraints to the distribution of zero points in the inherent mode function and redesigning the screening criterion of the inherent mode function. The detection of specific subharmonics in power grid is also realized. Compared with the traditional EMD method and p-q method, the proposed method can overcome the modal aliasing problem in the traditional empirical mode decomposition, compared with the p-q method. It is superior to p-q method in detecting accuracy and consistency of fundamental current phase. It can realize harmonic detection and has good accuracy. Finally, the SVG simulation environment of three-phase 5H bridge cascade is built in SIMULINK environment, and the control strategy is selected. The static and dynamic response characteristics of variable current load in reactive power compensation system are analyzed. The compensation experiments of resistive load in three-phase balance and unbalance are carried out respectively, and the power quality of the power network is obviously improved after compensation.
【學位授予單位】：中國民航大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V351.31

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本文編號：2382897