發(fā)布時(shí)間：2018-06-02 13:27

  本文選題：三電平有源電力濾波器 + 改進(jìn)型預(yù)測(cè)電流控制　； 參考：《北方工業(yè)大學(xué)》2017年碩士論文

【摘要】：近年來非線性負(fù)載得到大量應(yīng)用,導(dǎo)致大量諧波電流與無功電流注入到電網(wǎng),對(duì)電網(wǎng)造成污染,而有源電力濾波器(Active Power Filter,APF)可有效解決諧波電流污染問題。三電平APF由于其特有的拓?fù)浣Y(jié)構(gòu),具有耐壓等級(jí)高、開關(guān)應(yīng)力小等優(yōu)點(diǎn),在高壓、大功率應(yīng)用場(chǎng)合,研究?jī)r(jià)值和應(yīng)用前景較大。本文以三相三線制二極管箝位型三電平有源電力濾波器為研究對(duì)象,對(duì)電流跟蹤控制策略、LCL濾波器參數(shù)優(yōu)化設(shè)計(jì)和有源阻尼控制策略等關(guān)鍵技術(shù)進(jìn)行了深入分析。三電平APF工作原理和數(shù)學(xué)模型是其控制策略建立的基礎(chǔ)。本文首先介紹了三電平APF的工作原理,在此基礎(chǔ)上建立了三電平APF在abc坐標(biāo)系下的數(shù)學(xué)模型,為了方便控制器的設(shè)計(jì),繼續(xù)推導(dǎo)了其在dq坐標(biāo)系下的數(shù)學(xué)模型和交流小信號(hào)模型,為控制器設(shè)計(jì)奠定了基礎(chǔ)。電流跟蹤控制策略是決定三電平APF性能的關(guān)鍵因素。由于控制系統(tǒng)為數(shù)字控制系統(tǒng),不可避免的為系統(tǒng)控制帶來一拍延時(shí)。為此本文提出一種考慮輸出補(bǔ)償電流的改進(jìn)型預(yù)測(cè)電流跟蹤控制策略,在傳統(tǒng)預(yù)測(cè)電流控制策略僅對(duì)指令電流進(jìn)行預(yù)測(cè)的基礎(chǔ)上,利用三電平APF離散數(shù)學(xué)模型,對(duì)輸出補(bǔ)償電流進(jìn)行預(yù)測(cè),可有效消除數(shù)字系統(tǒng)延時(shí),顯著提高三電平APF補(bǔ)償效果和動(dòng)態(tài)響應(yīng)速度。LCL濾波器的參數(shù)對(duì)三電平APF補(bǔ)償效果和高頻濾波性能具有重要影響。為此,本文采用一種基于圖解的方法進(jìn)行LCL濾波器參數(shù)設(shè)計(jì),建立了單相LCL濾波器的數(shù)學(xué)模型,說明了 LCL濾波器參數(shù)設(shè)計(jì)指標(biāo)和步驟。LCL濾波器存在諧振問題。為解決這一固有問題,本文采用一種基于狀態(tài)反饋極點(diǎn)配置的有源阻尼控制策略,通過配置系統(tǒng)閉環(huán)極點(diǎn)來抑制LCL濾波器的諧振尖峰。為了方便三電平APF調(diào)試,開發(fā)了一套電力電子變換器通用調(diào)試系統(tǒng),可以實(shí)現(xiàn)三電平APF設(shè)備狀態(tài)監(jiān)測(cè)、數(shù)據(jù)顯示、修改和系統(tǒng)控制。該系統(tǒng)包括上位機(jī)和下位機(jī)兩部分,其中上位機(jī)負(fù)責(zé)設(shè)備狀態(tài)監(jiān)控、數(shù)據(jù)顯示、修改與系統(tǒng)控制,下位機(jī)負(fù)責(zé)數(shù)據(jù)采集和存儲(chǔ);上、下位機(jī)通過Modbus通信協(xié)議完成數(shù)據(jù)傳輸。為驗(yàn)證本文所提控制策略,設(shè)計(jì)了三電平LCL有源電力濾波器實(shí)驗(yàn)平臺(tái),詳細(xì)介紹了控制電路RC濾波參數(shù)設(shè)計(jì)過程。最后在實(shí)驗(yàn)平臺(tái)完成了本文所提改進(jìn)型預(yù)測(cè)電流跟蹤控制策略和有源阻尼控制策略的硬件實(shí)驗(yàn),驗(yàn)證了控制策略有效性。
[Abstract]:In recent years, a large number of nonlinear loads have been applied, resulting in a large amount of harmonic current and reactive current being injected into the power network, which causes pollution to the power network. The active Power filter (APF) can effectively solve the problem of harmonic current pollution. Due to its unique topology, three-level APF has the advantages of high voltage resistance and low switching stress, so it has great research value and application prospect in high-voltage and high-power applications. In this paper, three-phase three-wire diode-clamped three-level active power filter (APF) is used as the research object, and the key technologies such as the optimization design of LCL filter parameters and the active damping control strategy are deeply analyzed. The operating principle and mathematical model of three-level APF are the foundation of its control strategy. In this paper, the working principle of three-level APF is introduced, and the mathematical model of three-level APF in abc coordinate system is established on this basis, in order to facilitate the design of the controller, The mathematical model and AC small signal model in DQ coordinate system are derived, which lays a foundation for controller design. Current tracking control strategy is the key factor to determine the performance of three-level APF. Because the control system is a digital control system, it inevitably brings a beat delay for the system control. In this paper, an improved predictive current tracking control strategy considering the output compensation current is proposed. Based on the traditional predictive current control strategy which only predicts the instruction current, the three-level APF discrete mathematical model is used. By predicting the output compensation current, the delay of digital system can be effectively eliminated, and the parameters of three-level APF compensation and dynamic response speed. LCL filter have important influence on the three-level APF compensation effect and the performance of high-frequency filter. In this paper, a graphic method is used to design the parameters of LCL filter. The mathematical model of single-phase LCL filter is established, and the parameter design index of LCL filter and the resonance problem of step .LCL filter are explained. In order to solve this inherent problem, an active damping control strategy based on state feedback pole assignment is used to suppress the resonant spike of LCL filter by configuring the closed-loop poles of the system. In order to facilitate the debugging of three-level APF, a general debugging system of power electronic converter is developed, which can realize the state monitoring, data display, modification and system control of three-level APF equipment. The system consists of two parts: the upper computer and the lower computer, in which the upper computer is responsible for equipment state monitoring, data display, modification and system control, and the lower computer is responsible for data acquisition and storage, and the lower computer is responsible for data transmission through Modbus communication protocol. In order to verify the proposed control strategy, a three-level LCL active power filter experimental platform is designed, and the design process of RC filter parameters of the control circuit is introduced in detail. Finally, the hardware experiments of the improved predictive current tracking control strategy and the active damping control strategy proposed in this paper are completed on the experimental platform, and the effectiveness of the control strategy is verified.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM761

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本文編號(hào)：1968926