發(fā)布時(shí)間：2018-01-06 05:40

  本文關(guān)鍵詞：逆變器的三相不平衡負(fù)載控制方法研究　出處：《西南交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 三相四橋臂逆變器 雙同步旋轉(zhuǎn)坐標(biāo) 三維SVM調(diào)制法 零序抑制

【摘要】：三相電壓是否對(duì)稱是判斷電能質(zhì)量好壞的一個(gè)重要參數(shù),這對(duì)用電設(shè)備能否安全穩(wěn)定工作有很大的影響。由于分布式發(fā)電(如風(fēng)力發(fā)電或光伏發(fā)電)會(huì)出現(xiàn)離網(wǎng)帶不對(duì)稱負(fù)載工作狀態(tài)以及UPS或者航空電源等也會(huì)有出現(xiàn)不平衡負(fù)載情況,因此本文針對(duì)三相逆變器的輸出電壓不平衡問題展開研究工作。 本文首先將普通三相逆變器作為研究對(duì)象,分析傳統(tǒng)三相逆變器在負(fù)載平衡條件下能夠很好輸出三相對(duì)稱電壓,但對(duì)于負(fù)載不平衡或非線性負(fù)載而言,三相輸出電壓不能滿足國(guó)標(biāo)中的用電要求。對(duì)三種瞬時(shí)對(duì)稱分量法進(jìn)行了詳細(xì)的分析與推導(dǎo),在Matlab/Simulink仿真環(huán)境下建立三種瞬時(shí)對(duì)稱分量法仿真模型,分析各自的優(yōu)缺點(diǎn)。在對(duì)傳統(tǒng)三相逆變器不平衡問題產(chǎn)生機(jī)理進(jìn)行了分析的基礎(chǔ)上,采用線性疊加原理和對(duì)稱分量法對(duì)帶△/Y隔離變壓器三相逆變器研究,分別得到各相序的T型等值電路,列出微分方程進(jìn)行計(jì)算。分析帶△/Y隔離變壓器的三相逆變器帶不平衡負(fù)載的能力并搭建模型仿真論證。 其次,針對(duì)三相逆變器帶不平衡負(fù)載的能力由逆變器拓?fù)浜涂刂撇呗怨餐瑳Q定,本文深入研究了三相四橋臂拓?fù)淇共黄胶庳?fù)載的能力。在三相靜止abc坐標(biāo)系下建立了數(shù)學(xué)模型并進(jìn)行了穩(wěn)態(tài)分析。針對(duì)三相四橋臂的拓?fù)涮攸c(diǎn),摒棄了基于αβγ坐標(biāo)系下的三維SVPWM調(diào)制算法,采用了簡(jiǎn)便明了的基于abc坐標(biāo)系的三維SVPWM,給出了詳細(xì)的計(jì)算分析過程。簡(jiǎn)單介紹了TI公司設(shè)計(jì)的TMS320F28335DSP控制芯片的功能,進(jìn)行初始化程序設(shè)計(jì)并列出初始化流程圖。根據(jù)三維SVPWM算法思想畫出流程圖,利用C語(yǔ)言寫出程序,在DSP上對(duì)3DSVPWM調(diào)制算法實(shí)現(xiàn)。由于采用的PI調(diào)節(jié)器無(wú)法對(duì)時(shí)變的交流量實(shí)現(xiàn)無(wú)靜差跟蹤控制,因此基于正負(fù)序各自特點(diǎn)建立了雙同步旋轉(zhuǎn)坐標(biāo)系,有效的去除了正負(fù)序轉(zhuǎn)換到直流量時(shí)2倍頻分量的影響。 為了消除零序分量對(duì)系統(tǒng)的影響,考慮到零序分量在旋轉(zhuǎn)坐標(biāo)系下值為零,因此在傳統(tǒng)的PI直接控制法基礎(chǔ)上,提出了加入PR比例諧振控制改進(jìn)型以及利用零序虛擬構(gòu)造αβ坐標(biāo)系改進(jìn)型等兩種獨(dú)立控制法進(jìn)行了詳細(xì)的討論分析,并利用Matlab/Simulink對(duì)這三種方法進(jìn)行仿真,比較各自優(yōu)劣點(diǎn),降低了工作復(fù)雜難度且對(duì)零序抑制效果明顯。 最后對(duì)系統(tǒng)進(jìn)行參數(shù)設(shè)計(jì),將結(jié)合了雙閉環(huán)控制的三相四橋臂拓?fù)湓诟鞣N帶載情況下利用Matlab/Simulink建立仿真模型,與三相三橋臂及帶隔離變壓器的拓?fù)浞抡娼Y(jié)果做了對(duì)比分析,突出了三相四橋臂帶不平衡負(fù)載的能力,驗(yàn)證了控制策略的正確性。
[Abstract]:Whether the three-phase voltage is symmetrical or not is an important parameter to judge the power quality. This will have a great impact on the safety and stability of electrical equipment. Because of distributed generation (such as wind power or photovoltaic power generation). There will be an off-grid asymmetric load working state, as well as UPS or aeronautical power will also have an unbalanced load situation. Therefore, this paper focuses on the unbalanced output voltage of three-phase inverter. In this paper, the common three-phase inverter is first taken as the research object, and it is analyzed that the traditional three-phase inverter can output the three-phase symmetrical voltage well under the condition of load balance, but for the unbalanced load or nonlinear load. The three-phase output voltage can not meet the requirements of the national standard. The three kinds of instantaneous symmetric component method are analyzed and deduced in detail. Three kinds of instantaneous symmetric component simulation models are established in Matlab/Simulink simulation environment. Based on the analysis of the generation mechanism of unbalanced problem of traditional three-phase inverter, the linear superposition principle and the symmetrical component method are used to study the three-phase inverter with a / Y isolation transformer. The T-type equivalent circuits of each phase sequence are obtained, the differential equations are listed for calculation, and the ability of three-phase inverter with Y / Y isolation transformer with unbalanced load is analyzed and the model simulation is built. Secondly, the ability of three-phase inverter with unbalanced load is determined by inverter topology and control strategy. In this paper, the topological anti-unbalanced load capability of three-phase four-arm is deeply studied. The mathematical model is established in three-phase static abc coordinate system and the steady-state analysis is carried out. The topological characteristics of three-phase four-leg are analyzed. The 3D SVPWM modulation algorithm based on 偽 尾 緯 coordinate system is abandoned, and a simple and clear 3D SVPWM based on abc coordinate system is adopted. The detailed calculation and analysis process is given, and the functions of the TMS320F28335DSP control chip designed by TI Company are introduced briefly. Carry on initialization program design and list initialization flowchart. According to the idea of three-dimensional SVPWM algorithm draw the flow chart, use C language to write the program. The 3DSVPWM modulation algorithm is realized on DSP. Because the Pi regulator can not realize the static error tracking control for the time-varying AC quantity. Therefore, based on the characteristics of positive and negative sequence, a double synchronous rotating coordinate system is established, which effectively removes the influence of the frequency doubling component when the positive and negative sequence is converted to DC. In order to eliminate the influence of the zero-sequence component on the system, considering that the zero-sequence component is zero in the rotating coordinate system, it is based on the traditional Pi direct control method. Two independent control methods including PR proportional resonance control and 偽 尾 coordinate system improvement are proposed and discussed in detail. The three methods are simulated by Matlab/Simulink, and the advantages and disadvantages of each method are compared. The complexity of the work is reduced and the effect of zero sequence suppression is obvious. Finally, the parameters of the system are designed. The three-phase four-arm topology with double closed-loop control is used to establish the simulation model with Matlab/Simulink under various load conditions. Compared with the topology simulation results of three-phase three-leg and isolating transformer, the ability of three-phase four-arm with unbalanced load is highlighted, and the correctness of the control strategy is verified.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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