本文選題：微電網(wǎng) + 三相逆變器　； 參考：《東南大學(xué)》2016年碩士論文

【摘要】：微電網(wǎng)是一種由分布式電源、儲(chǔ)能裝置、能量轉(zhuǎn)換裝置、負(fù)荷、監(jiān)控和保護(hù)裝置等組成的小型發(fā)配電系統(tǒng),且是一個(gè)能夠?qū)崿F(xiàn)自我控制、保護(hù)和管理的自治系統(tǒng)。微電網(wǎng)的穩(wěn)定運(yùn)行依賴于各可控微源的有效控制。三相逆變器作為大多數(shù)可控微源,特別是儲(chǔ)能裝置、不間斷電源(UPS)等接入微電網(wǎng)的常用電力電子變換器,其在微電網(wǎng)不同運(yùn)行模式下的控制策略的研究顯得尤為重要。本文以此類三相逆變器為主要研究對(duì)象,在研究其運(yùn)行特點(diǎn)、拓?fù)浣Y(jié)構(gòu)以及控制目標(biāo)的基礎(chǔ)上,針對(duì)微電網(wǎng)不同的運(yùn)行方式下的控制要求,分別提出了相應(yīng)的微電網(wǎng)三相逆變器優(yōu)化控制策略,并深入分析了其合理性及有效性。全文的主要內(nèi)容如下：1、介紹了本課題的研究背景以及微電網(wǎng)的前景,從微電網(wǎng)系統(tǒng)控制、微電網(wǎng)運(yùn)行方式以及三相逆變器控制三個(gè)層面介紹了微電網(wǎng)的國(guó)內(nèi)外研究現(xiàn)狀,闡明了微電網(wǎng)三相逆變器需要可靠、有效及靈活的控制策略來(lái)實(shí)現(xiàn)微電網(wǎng)的穩(wěn)定運(yùn)行。此外,還介紹了本文的工程應(yīng)用背景。2、在分析交流微電網(wǎng)的拓?fù)浣Y(jié)構(gòu)的基礎(chǔ)上,系統(tǒng)地介紹了微電網(wǎng)中三相逆變器的分類及對(duì)應(yīng)的結(jié)構(gòu)特點(diǎn)和控制目標(biāo),然后從三相逆變器外環(huán)控制和內(nèi)環(huán)控制兩個(gè)方面介紹了已有的基本控制策略,并給出相應(yīng)的數(shù)學(xué)理論依據(jù)以及控制框圖。3、針對(duì)微電網(wǎng)并網(wǎng)、孤島兩種運(yùn)行模式,分別設(shè)計(jì)相應(yīng)的三相逆變器優(yōu)化控制策略。主要包括：(1)分析微電網(wǎng)兩種運(yùn)行模式下逆變器的控制特點(diǎn),并建立相應(yīng)的逆變系統(tǒng)數(shù)學(xué)模型。在參考濾波器元件取值約束的條件下,如諧振頻率、總電感量及諧波抑制能力等,選取合適的濾波器參數(shù),并分析驗(yàn)證其合理性：(2)在分析傳統(tǒng)的基于dq0旋轉(zhuǎn)坐標(biāo)系下的三相逆變器控制策略局限性基礎(chǔ)上,提出了基于aβ靜止坐標(biāo)系的雙閉環(huán)控制策略,引入比例諧振(PR)及準(zhǔn)比例諧振(QPR)控制器,消除穩(wěn)態(tài)誤差。同時(shí)分析微電網(wǎng)并網(wǎng)、孤島兩種運(yùn)行模式下影響微電網(wǎng)穩(wěn)定性的因素,引入基于Luenberger狀態(tài)觀測(cè)器理論的負(fù)載電流觀測(cè)器及并網(wǎng)電壓觀測(cè)器,實(shí)現(xiàn)對(duì)孤島模式下負(fù)載電流及并網(wǎng)狀態(tài)下并網(wǎng)電壓的實(shí)時(shí)觀測(cè),并作為控制策略的前饋,融入進(jìn)控制結(jié)構(gòu)中,優(yōu)化控制系統(tǒng)的動(dòng)態(tài)性能；(3)利用根軌跡法選取并優(yōu)化控制器參數(shù),然后利用閉環(huán)零極點(diǎn)圖及頻率特性圖的方式分析本文設(shè)計(jì)的控制策略的穩(wěn)定性。4、為驗(yàn)證文中的各項(xiàng)研究?jī)?nèi)容,本文建立了基于模塊化語(yǔ)言的MATLAB/Simulink仿真平臺(tái),開(kāi)展了仿真研究工作,同時(shí)建立基于DSP-FPGA的物理實(shí)驗(yàn)平臺(tái),設(shè)計(jì)實(shí)驗(yàn)所需的電路,并完成本文設(shè)計(jì)的控制策略及控制環(huán)路的實(shí)驗(yàn)驗(yàn)證。
[Abstract]:Microgrid is a small power generation and distribution system composed of distributed power generation, energy storage device, energy conversion device, load, monitoring and protection device, and it is an autonomous system that can realize self-control, protection and management. The stable operation of microgrid depends on the effective control of each controllable microsource. As most controllable microsources, especially energy storage devices, uninterruptible power supply (UPSs) and other power electronic converters, it is very important to study the control strategy of three-phase inverter in different operation modes of microgrid. This paper takes this kind of three-phase inverter as the main research object, on the basis of studying its operation characteristic, topology structure and control target, aiming at the control requirements under different operation modes of microgrid. The corresponding optimal control strategy of microgrid three-phase inverter is proposed, and its rationality and effectiveness are analyzed. The main contents of this paper are as follows: 1. This paper introduces the research background of this topic and the prospect of microgrid, and introduces the research status of microgrid at home and abroad from three aspects: microgrid system control, microgrid operation mode and three-phase inverter control. The reliable, effective and flexible control strategy is needed to realize the stable operation of microgrid three-phase inverter. In addition, the engineering application background of this paper is introduced. On the basis of analyzing the topology structure of AC microgrid, the classification of three-phase inverter in microgrid, the corresponding structure characteristics and control objectives are introduced systematically. Then it introduces the existing basic control strategies from two aspects of external loop control and inner loop control of the three-phase inverter, and gives the corresponding mathematical theory basis and control block diagram .3. aiming at the two operation modes of microgrid grid-connected and isolated island, the paper introduces the basic control strategy of three-phase inverter in two aspects: outer loop control and inner loop control. Corresponding optimal control strategies of three-phase inverter are designed respectively. The control characteristics of inverter in two operation modes of microgrid are analyzed, and the corresponding mathematical model of inverter system is established. The appropriate filter parameters are selected under the constraints of reference filter elements, such as resonant frequency, total inductance and harmonic suppression ability, etc. Based on the analysis of the limitation of traditional three-phase inverter control strategy based on dq0 rotation coordinate system, a dual-closed loop control strategy based on a 尾 stationary coordinate system is proposed. The proportional resonance (PR) and quasi-proportional resonance (QPR) controllers are introduced to eliminate the steady-state error. At the same time, the factors that affect the stability of microgrid under two operation modes of island are analyzed, and the load current observer and grid-connected voltage observer based on Luenberger state observer theory are introduced. The real-time observation of load current in islanding mode and grid-connected voltage in grid-connected state is realized. As feedforward of control strategy, the dynamic performance of the control system is optimized and the parameters of the controller are selected and optimized by the root locus method. Then, the stability of the control strategy designed in this paper is analyzed by means of closed loop zero pole diagram and frequency characteristic diagram. In order to verify the research contents in this paper, the MATLAB/Simulink simulation platform based on modular language is established, and the simulation research work is carried out. At the same time, the physical experiment platform based on DSP-FPGA is established, and the circuit needed for the experiment is designed, and the control strategy and the experimental verification of the control loop are completed.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM464

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