本文選題：逆阻型三電平變流器 + 交互式并聯(lián)　； 參考：《東南大學(xué)》2017年碩士論文

【摘要】：近年來(lái),新能源發(fā)電技術(shù)的快速發(fā)展為電力電子技術(shù)的發(fā)展帶來(lái)了機(jī)遇,變流器作為電能轉(zhuǎn)換的核心部件,是決定系統(tǒng)并網(wǎng)運(yùn)行穩(wěn)定性和安全性的關(guān)鍵部分,因此成為研究的重點(diǎn)領(lǐng)域。一方面,逆阻型三電平變流器具有輸出電壓與電流波形畸變小、功率因數(shù)高、器件開(kāi)關(guān)損耗低,耐壓等級(jí)高,模塊集成簡(jiǎn)單等優(yōu)點(diǎn)。另一方面,模塊化交互并聯(lián)系統(tǒng)以其靈活性和擴(kuò)展性強(qiáng)的特點(diǎn),成為目前研究和開(kāi)發(fā)的熱點(diǎn)�；诖吮尘�,本文展開(kāi)了基于多機(jī)交互式即公共直流交流母線(xiàn)并聯(lián)的逆阻型三電平變流器系統(tǒng)研究。首先,針對(duì)逆阻型三電平變流器的拓?fù)浣Y(jié)構(gòu),對(duì)其電路原理進(jìn)行了分析,詳細(xì)分析了一個(gè)工頻周期內(nèi)逆阻型三電平變流電路的八種工作狀態(tài),以及每種工作狀態(tài)對(duì)應(yīng)的輸出電平情況。然后分別針對(duì)abc坐標(biāo)系下、a-β坐標(biāo)系下以及dq0坐標(biāo)系下對(duì)逆阻型三電平變流電路進(jìn)行了建模。針對(duì)dq坐標(biāo)系下的逆阻型三電平變流器電路數(shù)學(xué)模型,進(jìn)行變流器并網(wǎng)控制策略的研究,分析了三相鎖相環(huán)與電流環(huán)的控制方式。其次,本文闡述了逆阻型三電平變流器的SVPWM調(diào)制策略的原理及步驟,分析了直流側(cè)中點(diǎn)電位不平衡的原因,提出了針對(duì)單機(jī)逆阻型三電平變流器,一種基于調(diào)整冗余小矢量作用時(shí)間的SVPWM調(diào)制算法的中點(diǎn)電壓平衡控制策略,并拓展到多機(jī)逆阻型三電平變流器交互并聯(lián)系統(tǒng),分別針對(duì)非共享中線(xiàn)和共享中線(xiàn)結(jié)構(gòu)進(jìn)行了分析,比較得出共享直流側(cè)中線(xiàn)的逆阻型三電平變流器交互并聯(lián)結(jié)構(gòu)更能滿(mǎn)足系統(tǒng)的控制要求。再次,本文針對(duì)多機(jī)逆阻型三電平變流器交互并聯(lián)系統(tǒng),通過(guò)9種并聯(lián)環(huán)路的分析,詳細(xì)闡述了環(huán)流的產(chǎn)生機(jī)理、建模以及分類(lèi)。通過(guò)分析得知,對(duì)于采用LCL濾波器和電流環(huán)并網(wǎng)控制的逆阻型三電平變流器,高頻零序環(huán)流分量被有效的抑制,因此低頻零序環(huán)流分量成為環(huán)流的主要成分。本文提出了一種基于PR控制器的低頻零序環(huán)流分量抑制策略,并結(jié)合逆阻型三電平變流器直流側(cè)中點(diǎn)電壓平衡控制策略,提出了與環(huán)流抑制的整體控制。每一臺(tái)逆阻型三電平變流器都單獨(dú)控制,以達(dá)到每臺(tái)變流器的精確控制。最后,通過(guò)MATLAB/SIMULINK軟件搭建仿真模型,對(duì)逆阻型三電平變流器并網(wǎng)控制策略、SVPWM調(diào)制算法、中點(diǎn)電壓平衡以及環(huán)流抑制策略進(jìn)行仿真分析,驗(yàn)證了所提出的控制策略的可行性和有效性。
[Abstract]:In recent years, the rapid development of new energy generation technology has brought opportunities for the development of power electronics technology. As the core component of power conversion, converter is the key part that determines the stability and security of the system. Therefore, it has become the key area of research. On the one hand, the inverse resistive three-level converter has the advantages of low output voltage and current waveform distortion, high power factor, low switching loss, high voltage resistance, simple module integration, and so on. On the other hand, modular interactive parallel system has become a hotspot in research and development because of its flexibility and expansibility. Based on this background, this paper develops the research of inverse resistive three-level converter system based on multi-machine interaction, that is, common DC busbar parallel connection. Firstly, aiming at the topology structure of inverse resistive three-level converter, the circuit principle is analyzed, and eight working states of inverse resistive three-level converter in a power frequency cycle are analyzed in detail. And the output level situation corresponding to each working state. Then the inverse resistive three-level variable current circuit is modeled in abc coordinate system and dq0 coordinate system respectively. Aiming at the mathematical model of inverse resistive three-level converter circuit in dq coordinate system, the grid-connected control strategy of converter is studied, and the control mode of three-phase phase-locked loop and current loop is analyzed. Secondly, this paper describes the principle and steps of SVPWM modulation strategy of inverse resistive three-level converter, analyzes the causes of unbalanced neutral point potential on DC side, and puts forward a three-level inverter for single-machine inverse resistive type. A neutral-point voltage balance control strategy based on SVPWM modulation algorithm based on adjusting redundant small vector action time is extended to a multi-machine inverse resistive three-level converter interactive parallel system. The structure of non-shared midline and shared midline are analyzed respectively. It is concluded that the interactive parallel structure of the inverse-resistive three-level converter with the shared DC neutral line can meet the control requirements of the system better. Thirdly, based on the analysis of 9 parallel loops, the mechanism, modeling and classification of the circulation are described in detail for the multi-machine inverse resistive three-level converter interactive parallel system. The analysis shows that the high frequency zero sequence circulation component is effectively suppressed for the inverse resistive three-level converter controlled by LCL filter and current loop, so the low frequency zero sequence circulation component becomes the main component of the circulation. In this paper, a low-frequency zero-sequence circulation component suppression strategy based on PR controller is proposed. Combined with the neutral-point voltage balance control strategy on the DC side of the inverse resistive three-level converter, the overall control of the current suppression is proposed. Each inverse resistive three-level converter is controlled separately to achieve the precise control of each converter. Finally, the simulation model is built by MATLAB/SIMULINK software to simulate the control strategy of inverse-resistive three-level converter, such as SVPWM modulation algorithm, neutral-point voltage balance and circulation suppression strategy. The feasibility and effectiveness of the proposed control strategy are verified.
【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】：2017
【分類(lèi)號(hào)】：TM46

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