本文關(guān)鍵詞：基于重復(fù)控制的APF補(bǔ)償電流控制方法的研究　出處：《東北大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 有源電力濾波器 諧波 穩(wěn)態(tài)誤差 重復(fù)控制

【摘要】：在工業(yè)自動(dòng)化水平不斷提高的今天,各個(gè)行業(yè)隨著電力電子設(shè)備的普及得到了迅猛的發(fā)展。但與此同時(shí),電網(wǎng)中的電力電子裝置以及非線性負(fù)載也給電力系統(tǒng)注入了大量的諧波電流及無(wú)功電流,造成了電網(wǎng)電能質(zhì)量問(wèn)題。由于其重要性以及緊迫性,諧波問(wèn)題得到了國(guó)內(nèi)外學(xué)者的重視與研究,具有重大的理論及現(xiàn)實(shí)意義。目前,有源電力濾波器被公認(rèn)為為治理電網(wǎng)諧波污染最有效的手段之一,具有廣闊的研究與應(yīng)用前景,成為電力電子技術(shù)中的一個(gè)研究熱點(diǎn)。目前有源電力濾波器的主要研究方向包括其拓?fù)浣Y(jié)構(gòu)、諧波電流檢測(cè)算法以及補(bǔ)償電路控制方法。本文首先介紹了APF的分類,并基于三相三線制并聯(lián)型有源電力濾波器,分析了它的拓?fù)浣Y(jié)構(gòu)以及工作原理,并依據(jù)系統(tǒng)結(jié)構(gòu)特點(diǎn)建立了有源電力濾波器的數(shù)學(xué)模型,給出了諧波檢測(cè)系統(tǒng)的算法及結(jié)構(gòu)圖,為下述研究工作打下了基礎(chǔ)。有源電力濾波器補(bǔ)償電流的控制精度,決定著諧波補(bǔ)償效果的優(yōu)劣。提升有源電力濾波器的電流補(bǔ)償效果,關(guān)鍵在于如何減小補(bǔ)償電流對(duì)參考電流的跟蹤誤差、提高跟蹤精度。采用傳統(tǒng)的PID控制器,控制效果及穩(wěn)定性并不理想。重復(fù)控制是基于內(nèi)模原理的新型控制策略,由于內(nèi)模中包含跟蹤誤差的數(shù)學(xué)模型,在理論上能完全消除系統(tǒng)的穩(wěn)態(tài)誤差。通過(guò)對(duì)重復(fù)控制器的性能分析,為增強(qiáng)系統(tǒng)的穩(wěn)定性及穩(wěn)態(tài)跟蹤性能,對(duì)傳統(tǒng)的重復(fù)控制器進(jìn)行了改進(jìn),引入了改進(jìn)型內(nèi)模及補(bǔ)償器,在保證系統(tǒng)穩(wěn)定的同時(shí),提高了系統(tǒng)穩(wěn)態(tài)控制性能。為提高系統(tǒng)的動(dòng)態(tài)響應(yīng),介于PI控制器動(dòng)態(tài)響應(yīng)速度快的特點(diǎn),本文采用了重復(fù)控制與PI控制相結(jié)合的方法,分別對(duì)并聯(lián)及串聯(lián)兩種結(jié)合方式進(jìn)行了研究,并對(duì)兩種控制系統(tǒng)進(jìn)行了詳細(xì)設(shè)計(jì)。最后,利用UATLAB/Simulink仿真軟件對(duì)兩種控制系統(tǒng)進(jìn)行了建模與仿真,并對(duì)仿真結(jié)果做出了比較與分析,證明了基于重復(fù)控制的復(fù)合控制策略可以有效地提高有源電力濾波器的穩(wěn)態(tài)補(bǔ)償精度,并保證了系統(tǒng)較快的動(dòng)態(tài)響應(yīng)速度,驗(yàn)證了本文采用的控制策略的正確性以及可行性。
[Abstract]:With the continuous improvement of the level of industrial automation, various industries with the popularity of power electronic equipment has been rapid development, but at the same time. Power electronic devices and nonlinear loads also inject a lot of harmonic and reactive currents into the power system, which cause power quality problems, because of its importance and urgency. Harmonic problem has been paid attention to and studied by domestic and foreign scholars, which has great theoretical and practical significance. At present, active power filter is recognized as one of the most effective means to control harmonic pollution. It has a broad research and application prospects, and has become a research hotspot in power electronics technology. At present, the main research direction of active power filter includes its topology. Harmonic current detection algorithm and compensation circuit control method. Firstly, this paper introduces the classification of APF, and based on three-phase three-wire shunt active power filter, analyzes its topology and working principle. The mathematical model of active power filter is established according to the structural characteristics of the system, and the algorithm and structure diagram of the harmonic detection system are given. For the following research work, the control accuracy of active power filter compensation current determines the effect of harmonic compensation, and improves the current compensation effect of active power filter. The key is how to reduce the tracking error of compensation current to the reference current and improve the tracking accuracy. The traditional PID controller is adopted. Repetitive control is a new control strategy based on the principle of internal model, because the internal model contains the mathematical model of tracking error. In theory, the steady-state error of the system can be completely eliminated. By analyzing the performance of the repetitive controller, the conventional repetitive controller is improved to enhance the stability and steady-state tracking performance of the system. The improved internal model and compensator are introduced to ensure the stability of the system and improve the steady-state control performance of the system. In order to improve the dynamic response of the system, the speed of dynamic response of Pi controller is high. In this paper, the combination of repetitive control and Pi control is used to study the parallel and serial control respectively, and the two control systems are designed in detail. The two control systems are modeled and simulated by UATLAB/Simulink software, and the simulation results are compared and analyzed. It is proved that the compound control strategy based on repetitive control can effectively improve the steady-state compensation accuracy of the active power filter and ensure the faster dynamic response speed of the system. The correctness and feasibility of the control strategy are verified.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM761;TN713.8

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