【摘要】：近年來,精密負(fù)載等高科技型設(shè)備對(duì)電網(wǎng)電能質(zhì)量的要求越來越高,而大量電力電子設(shè)備等非線性負(fù)載的并網(wǎng)運(yùn)行,卻使得公共電網(wǎng)的諧波畸變變得越來越嚴(yán)重,如何檢測(cè)和補(bǔ)償非線性負(fù)載所產(chǎn)生的諧波,提高電網(wǎng)電能質(zhì)量成為一個(gè)亟待解決的問題。因此本文對(duì)有源電力濾波器在分次補(bǔ)償方式下的諧波檢測(cè)算法進(jìn)行了深入的研究和比較:1.分析介紹了基于頻域的兩種分次諧波檢測(cè)方法—RDFT法和Goertzel RDFT法。為了解決異步采樣條件下RDFT法頻率泄露導(dǎo)致穩(wěn)態(tài)誤差變大的問題,第二章提出了一種改進(jìn)的基于RDFT法的分次諧波檢測(cè)方法,該方法根據(jù)鎖相環(huán)檢測(cè)到的頻率信息,自適應(yīng)地調(diào)整算法的采樣頻率,并通過對(duì)比仿真驗(yàn)證了該方法的有效性。2.分析介紹了基于同步旋轉(zhuǎn)坐標(biāo)系算法的分次諧波檢測(cè)算法的基本原理,推導(dǎo)得出了基于單模塊單一頻率檢測(cè)和多模塊并聯(lián)多頻率檢測(cè)算法的數(shù)學(xué)模型。在單模塊數(shù)學(xué)模型的基礎(chǔ)上對(duì)巴特沃斯低通濾波器的原理和參數(shù)進(jìn)行了分析和設(shè)計(jì)。通過對(duì)多模塊多頻率檢測(cè)算法的數(shù)學(xué)模型分析和建模仿真表明:多模塊并聯(lián)后進(jìn)行全諧波檢測(cè)時(shí),各個(gè)單次檢測(cè)的模塊之間會(huì)相互影響,導(dǎo)致算法的穩(wěn)態(tài)誤差變大�；诖藛栴},通過改進(jìn)算法結(jié)構(gòu)框圖得到了一種改進(jìn)的基于同步旋轉(zhuǎn)坐標(biāo)系法的分次諧波檢測(cè)方法,并通過數(shù)學(xué)分析和仿真驗(yàn)證,表明改進(jìn)后的算法具有更好的諧波檢測(cè)效果。3.分析介紹了基于自適應(yīng)陷波器算法的分次諧波檢測(cè)算法的基本原理和數(shù)學(xué)模型,基于傳統(tǒng)的自適應(yīng)陷波器法的頻率收斂速度受被檢測(cè)信號(hào)頻率和幅值的影響的問題,通過改進(jìn)算法的頻率檢測(cè)環(huán)節(jié)得到了一種改進(jìn)的基于鎖相環(huán)的自適應(yīng)陷波器法的分次諧波檢測(cè)方法,通過仿真,表明該方法的動(dòng)態(tài)響應(yīng)速度不受被檢測(cè)信號(hào)頻率和幅值的影響。4.分別在負(fù)載電流穩(wěn)定、負(fù)載電流幅值突變、負(fù)載電流頻率突變和負(fù)載電流含有未檢測(cè)次諧波的情況下對(duì)三相多模塊并聯(lián)的諧波檢測(cè)算法進(jìn)行了仿真和分析,仿真結(jié)果表明本文設(shè)計(jì)的各種諧波檢測(cè)方法的有效性,并對(duì)各方法檢測(cè)效果進(jìn)行了綜合對(duì)比。
[Abstract]:In recent years, high technology equipments such as precision load require higher and higher power quality. However, the harmonic distortion of public power network becomes more and more serious due to the grid connection of a large number of nonlinear loads such as power electronic equipment. How to detect and compensate harmonic produced by nonlinear load and improve power quality becomes an urgent problem. Therefore, the harmonic detection algorithm of active power filter based on graded compensation is studied and compared in this paper: 1. Two harmonic detection methods based on frequency domain, RDFT method and Goertzel RDFT method, are analyzed and introduced. In order to solve the problem that frequency leakage of RDFT method leads to large steady state error under asynchronous sampling condition, in chapter 2, an improved method of harmonic detection based on RDFT method is proposed, which is based on the frequency information detected by PLL. The sampling frequency of the algorithm is adjusted adaptively, and the effectiveness of the method is verified by comparison and simulation. 2. This paper analyzes and introduces the basic principle of order harmonic detection algorithm based on synchronous rotation coordinate system, and deduces the mathematical models of single frequency detection algorithm based on single module and parallel frequency detection algorithm based on multiple modules. Based on the single module mathematical model, the principle and parameters of Butterworth low pass filter are analyzed and designed. Through the mathematical model analysis and modeling simulation of the multi-module multi-frequency detection algorithm, it is shown that when the multi-module parallel connection is carried out the whole harmonic detection, each single detection module will affect each other, resulting in the algorithm's steady state error becoming larger. Based on this problem, an improved hierarchical harmonic detection method based on synchronous rotating coordinate system is obtained by improving the algorithm block diagram, and it is verified by mathematical analysis and simulation. It shows that the improved algorithm has better harmonic detection effect. This paper introduces the basic principle and mathematical model of graded harmonic detection algorithm based on adaptive notch algorithm. Based on the traditional adaptive notch method, the frequency convergence rate is affected by the frequency and amplitude of the detected signal. An improved frequency detection method based on phase-locked loop (PLL) adaptive notch filter method is presented in this paper. It is shown that the dynamic response speed of the method is not affected by the frequency and amplitude of the detected signal. 4. 4. When the load current is stable, the load current amplitude changes, the load current frequency changes and the load current contains undetected sub-harmonics, the harmonic detection algorithm of three-phase multi-module parallel connection is simulated and analyzed. The simulation results show the effectiveness of the various harmonic detection methods designed in this paper.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN713.8;TM935

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 陳海榮;徐政;錢向明;;空間矢量法自適應(yīng)檢測(cè)基波正負(fù)序及諧波分量[J];高電壓技術(shù);2006年10期

相關(guān)博士學(xué)位論文 前1條

1 張斌;高效穩(wěn)健的自適應(yīng)濾波算法研究[D];西安電子科技大學(xué);2010年

，

本文編號(hào)：2357975