本文選題：三電平有源電力濾波器　切入點(diǎn)：電流跟蹤控制　出處：《鄭州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電力系統(tǒng)中非線性負(fù)載的大量使用,它給電網(wǎng)所帶來的諧波污染問題也日益嚴(yán)重。有源電力濾波器(Active Power Filter,APF)作為一種能夠動(dòng)態(tài)抑制諧波的電力電子裝置,已經(jīng)成為抑制諧波和改善電能質(zhì)量的有效手段,并得到了越來越多的使用和研究。而在高壓、大容量以及對(duì)補(bǔ)償精度有較高要求的場合,傳統(tǒng)的兩電平APF已經(jīng)達(dá)不到要求,此時(shí)多電平技術(shù)應(yīng)運(yùn)而生,尤其是三電平APF受到越來越多青睞。電流跟蹤控制是決定APF補(bǔ)償性能好壞的關(guān)鍵因素之一,提高電流跟蹤控制效果對(duì)于提高APF的性能具有重要意義。因此,本文在三電平APF的模型基礎(chǔ)上進(jìn)行電流跟蹤控制的研究。首先本文在主電路等效模型的基礎(chǔ)上詳細(xì)推導(dǎo)了三電平APF的數(shù)學(xué)模型,為后續(xù)的電流跟蹤控制研究提供了數(shù)學(xué)依據(jù)。并且在二極管鉗位式變流器的基礎(chǔ)上重點(diǎn)討論了三電平SVPWM(Space Vector Pulse Width Modulation)調(diào)制算法的原理及其實(shí)現(xiàn),這種調(diào)制算法是三電平APF電流跟蹤控制的重要環(huán)節(jié)。然后介紹了逆系統(tǒng)的基本原理及系統(tǒng)的可逆性判定方法,在這個(gè)基礎(chǔ)上,將逆系統(tǒng)控制方法引入三電平APF的電流跟蹤控制中,實(shí)現(xiàn)補(bǔ)償電流的d、q軸分量線性化解耦控制,并采用常規(guī)的PI控制器來構(gòu)成閉環(huán)控制系統(tǒng)。用Matlab/Simulink對(duì)三電平APF的逆系統(tǒng)線性化解耦控制進(jìn)行仿真研究。最后在逆系統(tǒng)線性化解耦的基礎(chǔ)上提出采用非奇異終端滑模對(duì)三電平APF電流進(jìn)行跟蹤控制。介紹了滑模變結(jié)構(gòu)控制的基本原理,由此引出非奇異終端滑模的基本原理,接著對(duì)補(bǔ)償電流的d、q軸分量分別設(shè)計(jì)非奇異終端滑�？刂破鞑睦碚撋献C明了其穩(wěn)定性。給出基于逆系統(tǒng)的非奇異終端滑模電流跟蹤控制系統(tǒng)框圖,并用Matlab/Simulink對(duì)該電流跟蹤控制策略進(jìn)行仿真研究。仿真結(jié)果表明本文提出的電流跟蹤控制策略具有比較好的穩(wěn)態(tài)性能、動(dòng)態(tài)性能與魯棒性。
[Abstract]:With the large use of nonlinear load in power system, the harmonic pollution problem is becoming more and more serious. Active Power filter (APF) is a kind of power electronic device which can dynamically suppress harmonics. It has become an effective means to suppress harmonics and improve power quality, and has been used and studied more and more. But in the case of high voltage, large capacity and high compensation precision, the traditional two-level APF can not meet the requirements. The multilevel technology emerges as the times require, especially the three-level APF is more and more popular. Current tracking control is one of the key factors to determine the compensation performance of APF. It is very important to improve the performance of APF by improving the effect of current tracking control. In this paper, the current tracking control is studied on the basis of the three-level APF model. Firstly, the mathematical model of three-level APF is derived based on the equivalent model of the main circuit. This paper provides a mathematical basis for the following research on current tracking control. Based on diode clamped converter, the principle and implementation of three-level SVPWM(Space Vector Pulse Width modulation algorithm are discussed. This modulation algorithm is an important part of three-level APF current tracking control. Then the basic principle of inverse system and the determination method of system reversibility are introduced. The inverse system control method is introduced into the three-level APF current tracking control to realize the linearized decoupling control of the dq-axis component of the compensating current. The conventional Pi controller is used to construct the closed-loop control system. The linearization decoupling control of the three-level APF inverse system is simulated by Matlab/Simulink. Finally, the nonsingular terminal slippage is proposed based on the linearization decoupling of the inverse system. The principle of sliding mode variable structure control is introduced. The basic principle of nonsingular terminal sliding mode is derived. Then the nonsingular terminal sliding mode controller is designed for the dq-axis component of the compensating current and its stability is proved theoretically. The block diagram of the non-singular terminal sliding mode current tracking control system based on the inverse system is given. The simulation results show that the proposed current tracking control strategy has good steady-state performance, dynamic performance and robustness.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713;TM761

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