本文關(guān)鍵詞：模塊化三相四線制并聯(lián)型有源電力濾波器數(shù)字控制及實(shí)現(xiàn)　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 模塊化 三相四線制 并聯(lián)型有源電力濾波器 選擇性諧波補(bǔ)償 限流控制 數(shù)字控制 組合系統(tǒng) 均流控制

【摘要】：電力電子技術(shù)的日益發(fā)展成熟和電力自動化設(shè)備的廣泛應(yīng)用在推進(jìn)工業(yè)生產(chǎn)力發(fā)展和電氣自動化水平提高的同時,也引起了嚴(yán)重的電網(wǎng)諧波污染問題。有源電力濾波器(Active Power Filter, APF)作為諧波、無功動態(tài)補(bǔ)償裝置,可以有效的解決公用電網(wǎng)的諧波污染問題。本文以直流側(cè)電容分裂式三相四線制并聯(lián)型有源電力濾波器為載體,重點(diǎn)研究了選擇性諧波電流檢測算法及限流控制策略、補(bǔ)償電流數(shù)字控制策略以及多模塊并聯(lián)組合系統(tǒng)的控制與實(shí)現(xiàn)等問題。 本文從探尋適用于工業(yè)場合的選擇性諧波電流檢測算法角度出發(fā),對目前在APF中應(yīng)用較多的基于同步旋轉(zhuǎn)坐標(biāo)變換、基于數(shù)字帶通濾波器以及基于離散傅里葉變換(Discrete Fourier Transform, DFT)的選擇性諧波電流檢測算法進(jìn)行了研究和分析。提出了一種基于DFT的優(yōu)化選擇性諧波電流檢測算法的程序?qū)崿F(xiàn)方法,在保證高穩(wěn)態(tài)檢測精度的同時,大大減少了對程序空間的占用。對APF的過流原因和情況進(jìn)行了分析,提出了一種基于優(yōu)化DFT算法的限流控制策略,保證了APF的限容運(yùn)行。仿真和實(shí)驗(yàn)結(jié)果驗(yàn)證了所提出的選擇性諧波電流檢測算法和限流控制策略的正確性和有效性。 指令電流的跟蹤精度取決于控制策略的選擇和控制器的參數(shù)設(shè)計。本文以提高系統(tǒng)諧波補(bǔ)償精度、改善動態(tài)性能和適應(yīng)復(fù)雜工況為出發(fā)點(diǎn),引入了基于ABC坐標(biāo)系的控制策略,在時域下完成對直流側(cè)電壓和補(bǔ)償電流的閉環(huán)控制。詳細(xì)設(shè)計了以PI控制器和重復(fù)控制器組成的電流內(nèi)環(huán),以穩(wěn)壓環(huán)和均壓環(huán)組成的電壓外環(huán)的雙環(huán)控制器,極大的改善了諧波穩(wěn)態(tài)補(bǔ)償精度和動態(tài)響應(yīng)速度。各類工況下的實(shí)驗(yàn)結(jié)果驗(yàn)證了控制策略的可行性和有效性。 為了適用于大容量諧波負(fù)載的工況場合,對APF多模塊并聯(lián)組合系統(tǒng)進(jìn)行了研究。給出了多模塊并聯(lián)組合系統(tǒng)的結(jié)構(gòu),并闡述了其基本工作原理。對組合系統(tǒng)的負(fù)載電流采樣方法和均流控制策略進(jìn)行了研究。對組合系統(tǒng)的控制系統(tǒng)進(jìn)行了詳細(xì)設(shè)計,并闡述了其功能的數(shù)字實(shí)現(xiàn)方法。最后通過仿真和實(shí)驗(yàn)驗(yàn)證了組合系統(tǒng)的正確性和可實(shí)現(xiàn)性。
[Abstract]:With the development of power electronics technology and the wide application of power automation equipment, the development of industrial productivity and the improvement of electrical automation level are being promoted at the same time. Active Power filter (APFF) is used as harmonic and reactive power dynamic compensation device. It can effectively solve the problem of harmonic pollution in public power network. This paper takes the DC side capacitor split three-phase four-wire shunt active power filter as the carrier. The selective harmonic current detection algorithm and current limiting control strategy, the digital control strategy of compensation current and the control and implementation of multi-module parallel combined system are studied. In this paper, from the point of seeking selective harmonic current detection algorithm suitable for industrial applications, this paper focuses on the synchronous rotation coordinate transformation which is widely used in APF at present. Based on digital bandpass filter and discrete Fourier Transform. The selective harmonic current detection algorithm based on DFT is studied and analyzed, and a program implementation method of optimized selective harmonic current detection algorithm based on DFT is proposed. At the same time, the high accuracy of steady-state detection is guaranteed, and the occupation of program space is greatly reduced. The cause and situation of overcurrent in APF are analyzed, and a current limiting control strategy based on optimized DFT algorithm is proposed. The simulation and experimental results show that the proposed selective harmonic current detection algorithm and current limiting control strategy are correct and effective. The tracking accuracy of instruction current depends on the choice of control strategy and the design of controller parameters. This paper starts with improving the accuracy of harmonic compensation, improving dynamic performance and adapting to complex working conditions. The control strategy based on ABC coordinate system is introduced to complete the closed-loop control of DC side voltage and compensation current in time domain. The current inner loop composed of Pi controller and repetitive controller is designed in detail. A double loop controller of a voltage outer loop composed of a voltage stabilizing ring and a voltage equalizing ring. The accuracy of harmonic steady-state compensation and the dynamic response speed are greatly improved. The experimental results under various operating conditions verify the feasibility and effectiveness of the control strategy. In order to be suitable for large capacity harmonic load, the APF multi-module parallel combined system is studied, and the structure of the multi-module parallel combined system is given. The basic working principle of the system is described. The load current sampling method and current sharing control strategy of the combined system are studied. The control system of the combined system is designed in detail. Finally, the correctness and realizability of the combined system are verified by simulation and experiment.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM761;TN713.8

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