本文選題：諧波檢測(cè)　切入點(diǎn)：互補(bǔ)集合經(jīng)驗(yàn)?zāi)B(tài)分解　出處：《上海電機(jī)學(xué)院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：迅猛發(fā)展的電力電子技術(shù),致使電力系統(tǒng)中非線性負(fù)載越來越多,諧波污染問題也越來越嚴(yán)重,而越來越多的精密儀器不斷涌現(xiàn),用戶對(duì)電能質(zhì)量的要求也越來越高。因此,研究效果更好,精度更高的諧波檢測(cè)分析方法,為電力系統(tǒng)中諧波治理提供可靠的依據(jù),便具有了非常重要的意義。首先,從整體上對(duì)電力系統(tǒng)諧波理論進(jìn)行了介紹,其中包括諧波的基礎(chǔ)知識(shí)、國(guó)家規(guī)定的諧波衡量方式及其衡量標(biāo)準(zhǔn)以及幾種傳統(tǒng)的諧波檢測(cè)分析方法,并對(duì)這幾種方法進(jìn)行了分析。其次,詳細(xì)分析了傳統(tǒng)的經(jīng)驗(yàn)?zāi)B(tài)分解(EMD)理論與互補(bǔ)集合經(jīng)驗(yàn)?zāi)B(tài)分解(CEEMD)理論的工作原理,理論與仿真相結(jié)合,論證了互補(bǔ)集合經(jīng)驗(yàn)?zāi)B(tài)分解理論的優(yōu)越性;之后介紹了希爾伯特變換,并將該變換與互補(bǔ)集合經(jīng)驗(yàn)?zāi)B(tài)分解相結(jié)合,提出了一種時(shí)域與頻域相結(jié)合的諧波分析方法——CEEMD-HT算法。通過仿真實(shí)驗(yàn),結(jié)果表明,該算法能夠得到目標(biāo)信號(hào)的瞬時(shí)頻率以及瞬時(shí)幅值等信息,具備良好的諧波檢測(cè)與分析能力。接著,理論推導(dǎo)了瞬時(shí)功率理論以及瞬時(shí)無功功率理論,得出在三相電壓畸變的情況下,直接應(yīng)用瞬時(shí)無功功率理論的p-q檢測(cè)模型存在較大的檢測(cè)誤差。針對(duì)該模型所存在的問題,結(jié)合互補(bǔ)集合經(jīng)驗(yàn)?zāi)B(tài)分解的特點(diǎn),提出了C-EEMD算法,該算法能夠處理畸變電壓,得到電壓基波;將C-EEMD算法與p-q檢測(cè)模型相結(jié)合形,得到了一種時(shí)域內(nèi)的諧波檢測(cè)模型——改進(jìn)的p-q檢測(cè)模型。將改進(jìn)的p-q檢測(cè)模型與i_p-i_q檢測(cè)模型進(jìn)行對(duì)比仿真分析,結(jié)果表明,改進(jìn)的p-q檢測(cè)模型能夠在時(shí)域內(nèi)對(duì)系統(tǒng)的諧波總量進(jìn)行實(shí)時(shí)檢測(cè),有效的解決了電壓畸變對(duì)該系統(tǒng)的影響,并且比i_p-i_q檢測(cè)模型的檢測(cè)精度更高。最后,本文介紹了諧波補(bǔ)償?shù)幕驹砑捌浞N類,分析了有源電力濾波器的主電路以及控制策略,并對(duì)并聯(lián)型有源電力濾波器進(jìn)行了模型的搭建,將改進(jìn)的p-q檢測(cè)模型加到有源電力濾波器的諧波檢測(cè)模塊當(dāng)中,仿真結(jié)果表明,該有源濾波器能夠有效的實(shí)現(xiàn)對(duì)諧波電流的實(shí)時(shí)補(bǔ)償,并且效果良好。
[Abstract]:With the rapid development of power electronics technology, there are more and more nonlinear loads in power system, and the problem of harmonic pollution is becoming more and more serious. The harmonic detection and analysis method with better effect and higher precision is of great significance to provide reliable basis for harmonic treatment in power system. Firstly, the harmonic theory of power system is introduced. It includes the basic knowledge of harmonics, the measurement methods and standards of harmonics prescribed by the state, and several traditional harmonic detection and analysis methods. The working principle of the traditional empirical mode decomposition (EMD) theory and the complementary set empirical mode decomposition (CEEMD) theory are analyzed in detail. The advantages of the complementary set empirical mode decomposition theory are demonstrated by combining the theory with simulation. Then, the Hilbert transform is introduced and combined with the complementary set empirical mode decomposition. A harmonic analysis method, CEEMD-HT algorithm, is proposed, which combines time domain and frequency domain. The simulation results show that, The algorithm can obtain instantaneous frequency and instantaneous amplitude of target signal, and has good ability of harmonic detection and analysis. Then, the instantaneous power theory and instantaneous reactive power theory are derived theoretically. In the case of three-phase voltage distortion, the p-q detection model which directly applies instantaneous reactive power theory has a large detection error. In view of the problems existing in this model and the characteristics of complementary set empirical mode decomposition, a C-EEMD algorithm is proposed. The algorithm can deal with the distorted voltage and obtain the fundamental wave of the voltage. The C-EEMD algorithm is combined with the p-q detection model. An improved p-q detection model in time domain is obtained. The comparison between the improved p-q detection model and the iStack p-iq detection model is carried out. The results show that, The improved p-q detection model can real-time detect the total harmonics of the system in time domain, which effectively solves the influence of voltage distortion on the system, and has higher detection accuracy than the iStup _ iq detection model. Finally, This paper introduces the basic principle and types of harmonic compensation, analyzes the main circuit and control strategy of active power filter, and builds the model of shunt active power filter. The improved p-q detection model is added to the harmonic detection module of the active power filter. The simulation results show that the active power filter can effectively realize the real-time compensation of harmonic current, and the effect is good.
【學(xué)位授予單位】：上海電機(jī)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM935;TM714.3

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本文編號(hào)：1606138