本文選題：二極管箝位型 + 三電平逆變器　； 參考：《河南科技大學》2014年碩士論文

【摘要】：隨著我國工業(yè)的快速發(fā)展，多電平逆變器在高壓大容量交流變頻調速系統(tǒng)中的應用成為電力電子技術領域的研究熱點。由于多電平逆變器相對于傳統(tǒng)的兩電平逆變器，具有輸出電壓諧波含量小、功率開關器件頻率低等明顯的優(yōu)勢，現已在電力系統(tǒng)和電力傳動的高壓大容量場合得到廣泛的應用。 本文以二極管箝位型（NPC）三電平逆變器的異步電機矢量控制系統(tǒng)為研究對象，針對矢量控制中的轉子磁鏈觀測進行理論研究，對三電平空間電壓矢量調制（SVPWM）算法進行詳細的分析和探討，針對NPC三電平逆變器在運行過程存在的中點電位不平衡問題進行深入研究，并提出相應的解決方法。主要研究工作如下： 對高壓大容量交流調速系統(tǒng)進行簡要概述，討論多電平逆變器的研究現狀，探討多電平逆變器在變頻調速系統(tǒng)的應用；分析NPC三電平逆變器的拓撲結構，建立其數學模型；闡述異步電機矢量控制的基本原理。 針對NPC三電平逆變器采用的傳統(tǒng)三電平SVPWM調制算法復雜，不利于實時控制的缺點，提出一種基于簡化算法的三電平SVPWM調制算法，該算法通過對空間電壓矢量的分解及平移，來計算基本電壓矢量的作用時間和選擇合適的開關輸出狀態(tài)，達到簡化算法的目的。 針對NPC三電平逆變器存在的中點電位不平衡的問題，分析中點電位波動的機理，提出一種基于gh坐標系的虛擬空間電壓矢量(VSVPWM)準確補償中點電位的控制策略，引入虛擬中矢量和電壓調整系數，，對不同的正、負小矢量分配不同的調整系數，增加小矢量控制中點電位的平衡能力和靈活性；同時在gh坐標系下計算基本電壓矢量的作用時間，簡化算法的復雜性。 針對上述理論研究，搭建Simulink仿真平臺，利用MATLAB仿真軟件對三電平簡化SVPWM算法和中點電位補償平衡控制策略進行仿真分析，驗證所提算法的正確性。 設計基于NPC三電平逆變器的異步電機矢量控制系統(tǒng)實驗平臺，搭建硬件電路。在以TMS320F2812為核心的DSP控制板上，編寫軟件程序，通過實驗驗證所提出的三電平簡化SVPWM算法及中點電位補償平衡控制策略的有效性與可行性。
[Abstract]:With the rapid development of industry in our country, the application of multilevel inverter in high voltage and large capacity AC frequency conversion speed regulation system has become a research hotspot in the field of power electronics technology. Compared with the traditional two-level inverter, multilevel inverter has the advantages of low output voltage harmonic content and low frequency of power switch devices. It has been widely used in high voltage and large capacity fields of power system and power transmission. In this paper, the vector control system of induction motor based on diode clamped three-level inverter is studied. The theory of rotor flux observation in vector control is studied, and the three-level space voltage vector modulation (SVPWM) algorithm is analyzed and discussed in detail. The neutral-point potential imbalance of NPC three-level inverter during operation is studied and the corresponding solutions are put forward. The main research work is as follows: briefly summarize the high voltage large capacity AC speed regulating system, discuss the research status of the multilevel inverter, discuss the application of the multilevel inverter in the frequency conversion speed regulation system, analyze the topology structure of NPC three-level inverter, The basic principle of vector control for induction motor is described. The traditional three-level SVPWM modulation algorithm used in NPC three-level inverter is complex, which is not conducive to real-time control. A three-level SVPWM modulation algorithm based on simplified algorithm is proposed. By decomposing and translating the space voltage vector, the working time of the basic voltage vector is calculated and the appropriate switching output state is selected. In order to simplify the algorithm, the mechanism of neutral-point potential fluctuation in NPC three-level inverter is analyzed. A control strategy for accurate compensation of midpoint potential by virtual space voltage vector VSVPWM based on gh coordinate system is proposed. Virtual middle vector and voltage adjustment coefficient are introduced to assign different adjustment coefficients to different positive and negative small vectors. Increasing the balance ability and flexibility of point potential in small vector control, calculating the action time of basic voltage vector in gh coordinate system, simplifying the complexity of the algorithm. In view of the above theoretical research, a Simulink simulation platform is built. The simulation analysis of three-level simplified SVPWM algorithm and neutral-point potential compensation balance control strategy is carried out by using MATLAB simulation software to verify the correctness of the proposed algorithm. An experimental platform for vector control system of asynchronous motor based on NPC three-level inverter is designed. Build the hardware circuit. On the DSP control board with TMS320F2812 as the core, the software program is written to verify the effectiveness and feasibility of the proposed three-level simplified SVPWM algorithm and the neutral-point potential compensation balance control strategy.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

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本文編號：1997015