本文選題：電容中分型APF + 無諧波檢測策略��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：在我國低壓三相四線制供電系統(tǒng)中,由各類非線性和不對稱負(fù)載引起的諧波以及中性線電流問題日益突出。三相四線制有源電力濾波器(APF)作為一種能有效改善電網(wǎng)諧波和不平衡電流問題的裝置備受關(guān)注。本文以三橋臂電容中分型APF為研究對象,對基于無諧波電流檢測的模型預(yù)測電流跟蹤控制策略展開研究。首先,為簡化控制系統(tǒng)和降低成本,以綜合補(bǔ)償諧波與無功電流為目標(biāo),研究了一種基于無諧波檢測的APF電網(wǎng)電流直接控制策略。通過分析APF交、直流側(cè)的能量傳遞過程,指出直流側(cè)電壓控制輸出可作為無諧波檢測方案中的指令電流。推演分析傳統(tǒng)APF諧波檢測環(huán)節(jié)的等效形式,并由此討論檢測誤差影響,證明在綜合補(bǔ)償目標(biāo)下可省去諧波檢測環(huán)節(jié),再通過進(jìn)一步簡化推出電網(wǎng)電流直接控制策略。經(jīng)過總結(jié),分別從四個(gè)方面對比分析有、無諧波檢測環(huán)節(jié)的兩種APF控制策略。其次,因有限控制集模型預(yù)測控制(FCS-MPC)簡單易行、響應(yīng)快速,將其應(yīng)用于電容中分型APF的電流跟蹤控制策略中。建立三維坐標(biāo)系下的系統(tǒng)數(shù)學(xué)模型,分析三相電流耦合消除和不平衡電流抑制原理。先后推導(dǎo)出以補(bǔ)償電流、電網(wǎng)電流為控制對象的兩種預(yù)測模型,并建立相應(yīng)的單目標(biāo)與多目標(biāo)控制下的評價(jià)函數(shù),對比分析兩種模型下的控制流程。推導(dǎo)模型預(yù)測控制下由控制延時(shí)與電感失配系數(shù)決定的系統(tǒng)穩(wěn)定性條件。采用雙環(huán)PI控制以保證直流側(cè)電容電壓的穩(wěn)定和均衡,并設(shè)計(jì)控制器參數(shù)。再次,針對常規(guī)模型預(yù)測控制方法存在的采樣頻率高、開關(guān)頻率不固定等問題,給出了一種適用于所研究APF結(jié)構(gòu)的定頻模型預(yù)測控制方法。該方法結(jié)合SVPWM實(shí)現(xiàn)原理,通過空間劃分和電網(wǎng)電壓矢量定位,確定每個(gè)控制周期輸出所需的基本電壓矢量組合,并根據(jù)預(yù)測模型計(jì)算出各矢量的作用時(shí)間,經(jīng)過脈沖調(diào)制,最終可實(shí)現(xiàn)開關(guān)頻率的基本固定,獲得更好的補(bǔ)償性能。對定頻控制下的系統(tǒng)實(shí)現(xiàn)流程和電流跟蹤控制過程進(jìn)行分析,總結(jié)其與常規(guī)模型預(yù)測控制方法之間的區(qū)別。最后,設(shè)計(jì)了APF系統(tǒng)主要仿真參數(shù),并對所研究電流控制策略進(jìn)行仿真分析。仿真結(jié)果表明,在綜合補(bǔ)償時(shí),直流側(cè)電壓控制能自動(dòng)補(bǔ)償有功檢測誤差,驗(yàn)證了無諧波檢測方案的可行性;并且在模型預(yù)測控制下電流動(dòng)態(tài)響應(yīng)迅速,與有諧波檢測時(shí)相比,無諧波檢測策略下系統(tǒng)的穩(wěn)態(tài)補(bǔ)償效果更好。通過仿真分析采樣頻率、多目標(biāo)權(quán)值系數(shù)、控制延時(shí)以及電感失配系數(shù)對系統(tǒng)補(bǔ)償性能的影響,為控制性能的進(jìn)一步優(yōu)化提供了參考依據(jù)。此外,仿真結(jié)果顯示直流側(cè)穩(wěn)壓和均壓控制性能良好,驗(yàn)證了雙環(huán)PI控制的有效性。通過與常規(guī)模型預(yù)測控制的仿真對比,表明定頻模型預(yù)測控制下系統(tǒng)的動(dòng)態(tài)響應(yīng)速度相當(dāng),但穩(wěn)態(tài)補(bǔ)償精度更高,且受參數(shù)變化影響較小。
[Abstract]:In China's low voltage three-phase four-wire power supply system, harmonic and neutral line current problems caused by various nonlinear and asymmetric loads are becoming increasingly prominent. The three-phase four-wire active power filter (APF) has attracted much attention as a device that can effectively improve the harmonic and unbalanced current problems of power network. In this paper, the model predictive current tracking control strategy based on harmonic free current detection is studied based on the three-leg capacitor parting APF. Firstly, in order to simplify the control system and reduce the cost, a direct control strategy for APF power network based on harmonic detection is studied, aiming at synthetically compensating harmonic and reactive current. By analyzing the energy transfer process of the APF AC and DC side, it is pointed out that the DC side voltage control output can be used as the instruction current in the harmonic free detection scheme. By deducing and analyzing the equivalent form of traditional APF harmonic detection link and discussing the influence of detection error, it is proved that harmonic detection can be eliminated under the comprehensive compensation target, and then the direct control strategy of power network current is put forward through further simplification. After summing up, two kinds of APF control strategies without harmonic detection are compared and analyzed from four aspects. Secondly, because the FCS-MPC (finite Control set Model Predictive Control) is simple and fast, it is applied to the current-tracking control strategy of classified APF in capacitors. The mathematical model of the system in three dimensional coordinate system is established, and the principle of three-phase current coupling elimination and unbalanced current suppression is analyzed. Two predictive models with compensation current and power network current as the control object are derived successively, and the corresponding evaluation functions under single-objective and multi-objective control are established, and the control flow under the two models is compared and analyzed. The stability conditions of the system determined by the control delay and the inductance mismatch coefficient under the model predictive control are derived. Double loop Pi control is used to ensure the stability and equalization of DC capacitor voltage, and the controller parameters are designed. Thirdly, aiming at the problems of high sampling frequency and unstable switching frequency in the conventional model predictive control method, a fixed frequency model predictive control method suitable for the studied APF structure is presented. Combined with the principle of SVPWM, the basic voltage vector combination for each control period output is determined by space division and grid voltage vector location. The working time of each vector is calculated according to the prediction model, and the pulse modulation is carried out. Finally, the switching frequency can be basically fixed and better compensation performance can be obtained. The system implementation flow and current tracking control process under constant frequency control are analyzed, and the differences between them and conventional model predictive control methods are summarized. Finally, the main simulation parameters of APF system are designed, and the current control strategy is simulated and analyzed. The simulation results show that the DC side voltage control can automatically compensate for the active power detection error and verify the feasibility of the harmonic detection scheme, and the dynamic response of the current under the model predictive control is fast, compared with the harmonic detection, the simulation results show that the DC side voltage control can automatically compensate for the active power detection error, and verify the feasibility of the harmonic detection scheme. The steady-state compensation effect of the system is better under the strategy of harmonic detection. The effects of sampling frequency, multi-objective weight coefficient, control delay and inductor mismatch coefficient on the compensation performance of the system are analyzed by simulation, which provides a reference for the further optimization of the control performance. In addition, the simulation results show that the DC side voltage stabilization and voltage sharing control performance is good, which verifies the effectiveness of double loop Pi control. The simulation results show that the dynamic response speed of the system is equal to that of the conventional model predictive control, but the steady-state compensation accuracy is higher, and it is less affected by the change of parameters.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM761

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王清亮;趙東強(qiáng);付周興;童永利;鄭婕;;一種改進(jìn)的無鎖相環(huán)FBD諧波電流檢測方法[J];電工電能新技術(shù);2016年11期

2 劉建華;張亞健;朱蓓蓓;李佳;;分?jǐn)?shù)階PI~λ控制的雙閉環(huán)有源電力濾波器[J];電測與儀表;2016年09期

3 李國華;汪玉鳳;高小朋;;基于PI-VPI控制器的三相四開關(guān)APF電流直接控制方法[J];高電壓技術(shù);2016年01期

4 劉波;;基于無諧波檢測環(huán)節(jié)三電平APF的研究[J];電氣傳動(dòng);2015年12期

5 曾江;劉洋;陳浩平;黃海穎;王興華;;四橋臂APF定頻滯環(huán)電流控制[J];南方電網(wǎng)技術(shù);2015年11期

6 馬駿;時(shí)珊珊;李正力;于浩然;;一種改進(jìn)的PR控制器在三電平APF中的應(yīng)用[J];電力電子技術(shù);2015年09期

7 鮑祿山;王毅非;黎燕;;基于矢量解耦與預(yù)測電流控制相結(jié)合的APF的研究[J];電力系統(tǒng)保護(hù)與控制;2015年05期

8 徐群偉;鐘曉劍;胡健;陳國柱;;基于誤差迭代PI和改進(jìn)重復(fù)控制的APF補(bǔ)償電流控制[J];電力系統(tǒng)自動(dòng)化;2015年03期

9 杜少通;伍小杰;周娟;王福均;楊宇;;一種采用虛擬磁鏈模型預(yù)測的新型PWM算法[J];中國電機(jī)工程學(xué)報(bào);2015年03期

10 陳勇;田麗;趙明敏;杜道昶;;基于滑窗迭代DFT和小波包分析的諧波電流檢測方法[J];重慶工商大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年11期

相關(guān)博士學(xué)位論文 前7條

1 王裕;三相四線制有源電力濾波器關(guān)鍵技術(shù)研究[D];華南理工大學(xué);2015年

2 沈坤;三相逆變器及其并聯(lián)系統(tǒng)預(yù)測控制研究[D];湖南大學(xué);2012年

3 周娟;四橋臂有源電力濾波器關(guān)鍵技術(shù)研究[D];中國礦業(yè)大學(xué);2011年

4 謝斌;并聯(lián)型有源電力濾波器諧波檢測及控制技術(shù)研究[D];華中科技大學(xué);2010年

5 唐健;三相四線制三電平三橋臂APF關(guān)鍵技術(shù)及其控制研究[D];華中科技大學(xué);2010年

6 于晶榮;低壓配電網(wǎng)有源電力濾波器關(guān)鍵技術(shù)研究[D];湖南大學(xué);2009年

7 陳仲;并聯(lián)有源電力濾波器實(shí)用關(guān)鍵技術(shù)的研究[D];浙江大學(xué);2005年

相關(guān)碩士學(xué)位論文 前10條

1 蔡儒軍;三相四橋臂有源電力濾波器控制策略研究[D];中國礦業(yè)大學(xué);2016年

2 陸建龍;有源電力濾波器提升小波檢測及補(bǔ)償控制仿真研究[D];湘潭大學(xué);2015年

3 陳建宇;一種新型有源電力濾波器的研究[D];中國礦業(yè)大學(xué);2015年

4 王曉瑩;有源電力濾波器模型預(yù)測控制策略研究[D];中國礦業(yè)大學(xué);2015年

5 侯啟;三相四線制APF電網(wǎng)電流直接控制研究[D];廣西大學(xué);2014年

6 卞晶;三相有源電力濾波器控制策略對比研究[D];大連理工大學(xué);2014年

7 鐘曉劍;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)[D];浙江大學(xué);2014年

8 賈宇虹;并聯(lián)型有源濾波器諧波檢測與控制技術(shù)研究[D];浙江大學(xué);2014年

9 楊剛;電力電子濾波器的硬件設(shè)計(jì)與控制方法研究[D];東華大學(xué);2013年

10 葉明佳;基于瞬時(shí)無功功率理論的諧波和無功電流檢測方法研究[D];重慶大學(xué);2012年

，

本文編號：1792403