本文選題：諧波檢測　切入點：互補集合經(jīng)驗模態(tài)分解　出處：《上海電機學院》2017年碩士論文　論文類型：學位論文

【摘要】：迅猛發(fā)展的電力電子技術,致使電力系統(tǒng)中非線性負載越來越多,諧波污染問題也越來越嚴重,而越來越多的精密儀器不斷涌現(xiàn),用戶對電能質(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,從整體上對電力系統(tǒng)諧波理論進行了介紹,其中包括諧波的基礎知識、國家規(guī)定的諧波衡量方式及其衡量標準以及幾種傳統(tǒng)的諧波檢測分析方法,并對這幾種方法進行了分析。其次,詳細分析了傳統(tǒng)的經(jīng)驗模態(tài)分解(EMD)理論與互補集合經(jīng)驗模態(tài)分解(CEEMD)理論的工作原理,理論與仿真相結合,論證了互補集合經(jīng)驗模態(tài)分解理論的優(yōu)越性;之后介紹了希爾伯特變換,并將該變換與互補集合經(jīng)驗模態(tài)分解相結合,提出了一種時域與頻域相結合的諧波分析方法——CEEMD-HT算法。通過仿真實驗,結果表明,該算法能夠得到目標信號的瞬時頻率以及瞬時幅值等信息,具備良好的諧波檢測與分析能力。接著,理論推導了瞬時功率理論以及瞬時無功功率理論,得出在三相電壓畸變的情況下,直接應用瞬時無功功率理論的p-q檢測模型存在較大的檢測誤差。針對該模型所存在的問題,結合互補集合經(jīng)驗模態(tài)分解的特點,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檢測模型相結合形,得到了一種時域內(nèi)的諧波檢測模型——改進的p-q檢測模型。將改進的p-q檢測模型與i_p-i_q檢測模型進行對比仿真分析,結果表明,改進的p-q檢測模型能夠在時域內(nèi)對系統(tǒng)的諧波總量進行實時檢測,有效的解決了電壓畸變對該系統(tǒng)的影響,并且比i_p-i_q檢測模型的檢測精度更高。最后,本文介紹了諧波補償?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,并對并聯(lián)型有源電力濾波器進行了模型的搭建,將改進的p-q檢測模型加到有源電力濾波器的諧波檢測模塊當中,仿真結果表明,該有源濾波器能夠有效的實現(xiàn)對諧波電流的實時補償,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.
【學位授予單位】：上海電機學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM935;TM714.3

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