本文選題：NPC三電平逆變器 + 永磁同步電機��； 參考：《東北大學》2014年碩士論文

【摘要】：在我國電能資源消耗不斷增加,并且提倡節(jié)能減排的今天,變頻調速系統(tǒng)已作為節(jié)能減排的重要手段之一被廣泛應用,由于多電平逆變器對功率開關器件耐壓要求低,輸出諧波含量較少,電磁干擾小等優(yōu)點被廣泛應用在高壓大功率交流變頻調速系統(tǒng)中,其中NPC (Neutral Point Clamped)三電平逆變器是應用最為廣泛的一種拓撲結構。永磁同步電機(Permanent Magnet Synchronous Motor, PMSM)由于結構簡單、效率高、控制性能好等優(yōu)點已被廣泛應用于交流伺服領域和變頻調速系統(tǒng)。本文從三電平逆變器和永磁同步電機的結構特點出發(fā),根據兩者的數學模型和理論基礎,介紹了基于NPC三電平逆變器永磁同步電機的一些基本的控制方法和發(fā)展情況。并對三電平逆變器永磁電機直接轉矩控制DTC做出分析和對算法的改進,提出了兩種方法并進行仿真及相關實驗研究,本文主要完成的工作有：基于改進作用矢量型固定合成矢量的直接轉矩控制算法研究,鑒于三電平NPC逆變器固有問題：中點電位偏移、輸出電壓變化率高、開關頻率及開關損耗高等提出一種基于中點電位控制的固定合成矢量算法。該算法將不同的空間電壓矢量按優(yōu)先考慮最小中點電壓波動的原則進行合成,同樣有效克服電壓輸出變化率高和開關損耗大等問題,并建立基于Matlab/Simulink環(huán)境仿真系統(tǒng)模型,證明該方法有效的抑制了中點電位不平衡、輸出電壓變化率高、開關損耗等問題。基于改進型固定合成矢量的直接轉矩算法研究,本文在研究十二矢量固定合成方法的基礎上,為了更加精確控制電磁轉矩和定子磁鏈,將固定合成矢量個數增加到24,將整個矢量空間細分到24個空間作用區(qū)域,該算法在解決二極管鉗位型固有問題的同時,進一步減小輸出電壓、電流諧波含量,從而減小電機定子磁鏈與電磁轉矩的高頻脈動波紋。本文最后完成了NPC三電平逆變器永磁同步電機控制系統(tǒng)的實驗,它的硬件系統(tǒng)主要包括控制電路、驅動電路、檢測調理電路、保護電路等等；在DSP的集成開發(fā)環(huán)境CCS3.3完成軟件設計。通過實驗證明該系統(tǒng)的正確性和可行性。
[Abstract]:With the increasing consumption of power resources in our country and the promotion of energy saving and emission reduction, the frequency conversion speed regulation system has been widely used as one of the important means of energy saving and emission reduction, because of the low voltage requirements of the multilevel inverter to the power switch devices. The advantages of low output harmonics and small electromagnetic interference are widely used in high voltage and high power AC variable frequency speed control systems, among which NPC Neutral Point Clamped-based three-level inverter is the most widely used topology. Permanent Magnet synchronous Motor (PMSM) has been widely used in AC servo field and variable frequency speed control system because of its simple structure, high efficiency and good control performance. Based on the structural characteristics of three-level inverter and permanent magnet synchronous motor, this paper introduces some basic control methods and development of permanent magnet synchronous motor based on NPC three-level inverter according to their mathematical model and theoretical basis. The DTC of permanent magnet motor with three-level inverter is analyzed and the algorithm is improved. Two methods are proposed, and the simulation and experimental research are carried out. The main works of this paper are as follows: the research of direct torque control algorithm based on improved fixed synthesis vector of action vector, in view of the inherent problem of three-level NPC inverter: neutral point potential offset, high output voltage change rate, A fixed synthesis vector algorithm based on midpoint potential control is proposed for switching frequency and switching loss. The algorithm combines different space voltage vectors according to the principle of priority to minimum midpoint voltage fluctuation, which can also overcome the problems of high voltage output change rate and high switching loss, and establish a simulation system model based on Matlab / Simulink environment. It is proved that this method can effectively suppress the imbalance of midpoint potential, high output voltage change rate, switching loss and so on. Based on the improved direct torque algorithm of fixed synthesis vector, in this paper, based on the study of twelve vector fixed synthesis method, in order to control the electromagnetic torque and stator flux more accurately, The number of fixed synthetic vectors is increased to 24, and the whole vector space is subdivided into 24 space action regions. The algorithm solves the inherent problem of diode clamping while further reducing the output voltage and current harmonic content. Thus reducing the high frequency ripple of stator flux and electromagnetic torque. Finally, the experiment of NPC three-level inverter PMSM control system is completed. Its hardware system mainly includes control circuit, drive circuit, detecting conditioning circuit, protection circuit and so on. The software design is completed in the DSP integrated development environment CCS 3.3. The correctness and feasibility of the system are proved by experiments.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464;TM341

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