本文選題：電能質(zhì)量　切入點：間諧波　出處：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著電網(wǎng)中非線性負(fù)荷的日益增多,間諧波問題也愈發(fā)突出。對間諧波源的責(zé)任進(jìn)行量化,有助于建立科學(xué)規(guī)范的電能質(zhì)量管理體系。間諧波源責(zé)任劃分的前提是進(jìn)行間諧波參數(shù)的提取,論文研究了傳統(tǒng)IEC測量方法的不足,并采用了利用Prony方法進(jìn)行參數(shù)提取。為有效進(jìn)行間諧波源責(zé)任分?jǐn)?論文提出了三類責(zé)任指標(biāo),分別是間諧波電流、電壓及功率。首先,根據(jù)間諧波源分布特性不一致的情況,論文構(gòu)造了基于核密度估計與重要抽樣相結(jié)合的蒙特卡洛方法,用以計算多間諧波源同次間諧波電流疊加,并在此基礎(chǔ)上,根據(jù)向量疊加的原理計算了間諧波電流責(zé)任。其次,利用有功功率流向法將間諧波源定位,若間諧波來源為用電方,則計算各個用戶的間諧波功率責(zé)任,此時功率責(zé)任定義為關(guān)注的間諧波源有功功率的絕對值占所有間諧波源有功功率絕對值之和的比重。最后,關(guān)于傳統(tǒng)的間諧波電壓責(zé)任,關(guān)鍵在于求取系統(tǒng)間諧波阻抗,本文提出了一種細(xì)分迭代法與k均值聚類相結(jié)合的方法,通過聚類中心的選取替代了精度的手動設(shè)置進(jìn)行計算,并通過PSCAD仿真驗證了該方法的有效性和準(zhǔn)確性。
[Abstract]:With the increasing of nonlinear load in power network, the problem of interharmonics becomes more and more serious. It is helpful to establish a scientific and standardized power quality management system. The premise of the responsibility division of the interharmonic source is to extract the parameters of the interharmonics. This paper studies the shortcomings of the traditional IEC measurement methods. In order to allocate the responsibility of inter-harmonic source effectively, three kinds of responsibility indexes are proposed, namely, inter-harmonic current, voltage and power. Firstly, according to the inconsistent distribution of inter-harmonic source, the paper proposes three kinds of responsibility indexes: interharmonic current, voltage and power. In this paper, a Monte Carlo method based on kernel density estimation and important sampling is constructed to calculate the harmonic current superposition between multiple harmonic sources, and based on the principle of vector superposition, the responsibility of interharmonic current is calculated. The active power flow method is used to locate the inter-harmonic source. If the inter-harmonic source is the power source, the responsibility of the inter-harmonic power of each user is calculated. At this time, power responsibility is defined as the proportion of the absolute value of the active power of the interharmonic source concerned to the sum of all the absolute values of the active power of the interharmonic source. Finally, with regard to the traditional responsibility of inter-harmonic voltage, the key point is to calculate the inter-harmonic impedance of the system. In this paper, a subdivision iteration method combined with k-means clustering is proposed. The accuracy of the method is verified by PSCAD simulation.
【學(xué)位授予單位】：華北電力大學(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：1658625