本文選題：小波包變換 + 非線性負(fù)荷�。� 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著社會(huì)的進(jìn)步、工業(yè)的發(fā)展,電網(wǎng)的容量迅速擴(kuò)展,電氣化鐵路、軋鋼機(jī)、光伏發(fā)電、電力電子產(chǎn)品等非線性負(fù)荷日益增多,已經(jīng)成為電網(wǎng)負(fù)荷中十分重要的一部分。由于大量非線性負(fù)荷的接入、現(xiàn)場(chǎng)負(fù)荷的頻繁波動(dòng),用電負(fù)載電流呈現(xiàn)出隨時(shí)間變化,甚至出現(xiàn)短時(shí)間的劇烈波動(dòng)的情況。這些非線性負(fù)荷還會(huì)引入諧波,使得電壓、電流的波形發(fā)生畸變,尤其是電流畸變更為嚴(yán)重,從而導(dǎo)致電網(wǎng)中電能質(zhì)量日趨下降。智能電能表是國(guó)家法定計(jì)量器具之一,而現(xiàn)有的電能表都是基于傳統(tǒng)正弦穩(wěn)態(tài)功率理論進(jìn)行電能的計(jì)量的,難以滿足非線性負(fù)荷條件下電能的準(zhǔn)確計(jì)量。由于計(jì)量準(zhǔn)確度的較少的變化,都會(huì)帶來較大的經(jīng)濟(jì)效益,因此實(shí)現(xiàn)非線性負(fù)荷用電量的準(zhǔn)確計(jì)量是不容忽視的課題。論文主要研究了小波包變換在非線性負(fù)荷電能計(jì)量中的應(yīng)用。首先介紹了非線性負(fù)荷電能計(jì)量的現(xiàn)狀,并針對(duì)電氣化鐵路、軋鋼機(jī)、太陽能光伏發(fā)電等典型非線性負(fù)荷制定了現(xiàn)場(chǎng)電壓、電流的數(shù)據(jù)采集方案,并根據(jù)現(xiàn)場(chǎng)測(cè)試采集的數(shù)據(jù)針對(duì)諧波、間諧波的存在情況進(jìn)行分析。其次,對(duì)現(xiàn)有的電能計(jì)量算法,即點(diǎn)積和電能計(jì)量算法、基于FFT的電能計(jì)量算法、基于加窗插值FFT的電能計(jì)量算法作了介紹并進(jìn)行Matlab仿真,在此基礎(chǔ)上對(duì)上述方法所存在的問題進(jìn)行了分析。針對(duì)非線性負(fù)荷存在大量諧波、間諧波的情況,論文提出了基于小波包變換的非線性負(fù)荷電能計(jì)量新算法。根據(jù)符合非線性負(fù)荷電能計(jì)量的計(jì)量標(biāo)準(zhǔn)IEEE1459-2000所定義的電器物理量,給出了具體的電能計(jì)量步驟與計(jì)算公式的推導(dǎo)過程。同樣對(duì)該方法進(jìn)行了Matlab仿真。并且通過Matlab仿真、現(xiàn)場(chǎng)所采集的典型非線性負(fù)荷數(shù)據(jù)所得到的計(jì)算電能值以及算法復(fù)雜度三方面與現(xiàn)有方法進(jìn)行了比較。通過仿真和現(xiàn)場(chǎng)采集數(shù)據(jù)計(jì)算所得到的結(jié)論證明,小波包電能算法與現(xiàn)有的電能計(jì)量方法相比,能夠更準(zhǔn)確的計(jì)量非線性負(fù)荷的用電量,所提出的算法具有一定的參考價(jià)值。
[Abstract]:With the progress of society and the development of industry, the capacity of power grid expands rapidly. The nonlinear loads such as electrified railway, rolling mill, photovoltaic power generation and power electronic products are increasing day by day, which has become a very important part of power grid load.Because of a large number of nonlinear load access, the frequent fluctuations of the field load, the electric load current changes with time, or even a short period of violent fluctuations.These nonlinear loads will also introduce harmonics, which will make the waveform of voltage and current distorted, especially the distortion of current is more serious, resulting in the power quality in the power network declining day by day.Intelligent watt-hour meter is one of the national legal measuring instruments, but the existing watt-hour meter is based on the traditional sinusoidal steady-state power theory, so it is difficult to satisfy the accurate measurement of electric energy under the condition of nonlinear load.Because less change of metering accuracy will bring great economic benefit, it is an important task to realize accurate metering of nonlinear load electricity consumption.This paper mainly studies the application of wavelet packet transform in nonlinear load energy measurement.Firstly, the current situation of nonlinear load electric energy measurement is introduced, and the data acquisition scheme of field voltage and current is established for typical nonlinear loads such as electrified railway, steel rolling mill, solar photovoltaic power generation and so on.According to the data collected from field testing, the existence of harmonics and interharmonics is analyzed.Secondly, the existing power metering algorithms, namely dot product and power metering algorithms, the power metering algorithms based on FFT, and the power metering algorithms based on windowed interpolated FFT are introduced and simulated by Matlab.On this basis, the problems existing in the above methods are analyzed.In view of the existence of a large number of harmonics and interharmonics in nonlinear load, a new algorithm of nonlinear load energy measurement based on wavelet packet transform is proposed in this paper.According to the electrical physical quantity defined by the standard IEEE1459-2000 of nonlinear load electric energy metering, the concrete steps of electric energy metering and the derivation of calculating formula are given.The method is also simulated by Matlab.Through Matlab simulation, the computational power value and the algorithm complexity obtained from the typical nonlinear load data collected in the field are compared with the existing methods.The results of simulation and field data calculation show that the wavelet packet power algorithm can measure the power consumption of nonlinear load more accurately than the existing power metering method, and the proposed algorithm has certain reference value.
【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】：2017
【分類號(hào)】：TM933.4

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本文編號(hào)：1733018