本文選題：有源電力濾波器 + 二階廣義積分器��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：電力電子裝置等非線性負(fù)載在電力系統(tǒng)中的普遍應(yīng)用,引起大量的諧波電流進(jìn)入公用電力系統(tǒng),造成嚴(yán)重危害,如增加線路損耗,影響設(shè)備壽命,引起串并聯(lián)諧振等問題。有源電力濾波器是解決該諧波污染問題的有效裝置。本文主要針對并聯(lián)型有源電力濾波器的鎖相環(huán)、有源阻尼建模及電流跟蹤控制算法進(jìn)行研究。首先,有源電力濾波器運行需要實時監(jiān)測電網(wǎng)頻率及相位,并要求鎖相環(huán)能穩(wěn)定準(zhǔn)確運行于不平衡、畸變電網(wǎng)環(huán)境。針對該目標(biāo),本文在傳統(tǒng)SRF-PLL的基礎(chǔ)上利用二階廣義積分器和對稱分量法進(jìn)行改進(jìn)。與傳統(tǒng)的SRF-PLL鎖相環(huán)相比,它不僅能消除電網(wǎng)電壓諧波的干擾,且能穩(wěn)定跟蹤電網(wǎng)正序分量,抵抗電網(wǎng)電壓不平衡影響。通過仿真和理論推導(dǎo)驗證了該方法的可靠性和優(yōu)越性。其次,有源阻尼型LCL輸出濾波的系統(tǒng)建模是有源電力濾波器的關(guān)鍵技術(shù)。針對LCL型濾波器的諧振尖峰問題,本文采用電容電流比例反饋的方法進(jìn)行有源阻尼,介紹了有源阻尼LCL的基本特性。并在abc坐標(biāo)系下推導(dǎo)建立了電流環(huán)的傳遞函數(shù)及控制模型。針對數(shù)字控制存在采樣延時和調(diào)制延時,本文分析了數(shù)字延時的產(chǎn)生機(jī)理,分析了數(shù)字延時對系統(tǒng)控制環(huán)路的影響,并建立了考慮數(shù)字延時的精確的系統(tǒng)模型,為電流環(huán)控制器設(shè)計提供設(shè)計依據(jù)。最后還分析了數(shù)字延遲下的LCL有源阻尼特性。再次,本文還針對輸出電流跟蹤控制進(jìn)行了頻域的分析和設(shè)計。具體來說,本文設(shè)計了多比例諧振控制器配合比例積分控制器完成輸出電流跟蹤,該方法可提高諧波頻率處的開環(huán)增益,提高補償效果。應(yīng)用對數(shù)穩(wěn)定性判據(jù)和Nyquist穩(wěn)定性判據(jù)保證了設(shè)計的控制器的穩(wěn)定性和可靠性�？刂菩Ч肞SIM仿真軟件完成了驗證。最后,本課題搭建了一臺10kVA的三相三電平APF實驗樣機(jī),分別對本文設(shè)計的軟件鎖相環(huán)和電流環(huán)環(huán)路建模及控制進(jìn)行了實驗驗證,實驗結(jié)果驗證了本文設(shè)計的鎖相環(huán)、建模及控制器設(shè)計是有效的。
[Abstract]:The widespread application of nonlinear loads such as power electronic devices in power systems causes a large number of harmonic currents to enter public power systems, causing serious harm, such as increasing line losses, affecting equipment life, causing series-parallel resonance and so on. Active power filter is an effective device to solve the problem of harmonic pollution. In this paper, phase locked loop (PLL), active damping modeling and current tracking control algorithm of shunt active power filter (APF) are studied. First, the active power filter needs to monitor the frequency and phase of the power network in real time, and the PLL can run stably and accurately in the unbalanced and distorted power network environment. Based on the traditional SRF-PLL, the second order generalized integrator and symmetric component method are used to improve the target. Compared with the traditional SRF-PLL PLL, it can not only eliminate the interference of voltage harmonics, but also stably track the positive sequence components and resist the influence of voltage imbalance. The reliability and superiority of the method are verified by simulation and theoretical derivation. Secondly, the system modeling of active damping LCL output filter is the key technology of active power filter. In order to solve the problem of resonant spike of LCL filter, this paper introduces the basic characteristics of active damping LCL by the method of proportional feedback of capacitive current. The transfer function and control model of the current loop are derived in abc coordinate system. In view of the existence of sampling delay and modulation delay in digital control, this paper analyzes the mechanism of digital delay, analyzes the influence of digital delay on the control loop of the system, and establishes an accurate system model considering digital delay. It provides the basis for the design of current loop controller. Finally, the active damping characteristics of LCL with digital delay are analyzed. Thirdly, the output current tracking control is analyzed and designed in frequency domain. Specifically, the multi-proportional resonance controller and the proportional integral controller are designed to track the output current. This method can improve the open-loop gain at the harmonic frequency and improve the compensation effect. The logarithmic stability criterion and Nyquist stability criterion are applied to ensure the stability and reliability of the designed controller. The control effect is verified by PSIM simulation software. Finally, a 10kVA three-phase three-level APF experimental prototype is built, and the software phase-locked loop and the current loop are modeled and controlled, respectively. The experimental results verify the design of the phase-locked loop. Modeling and controller design are effective.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM761

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