本文選題：雙三電平逆變器 + 開繞組異步電機(jī)��； 參考：《中國(guó)礦業(yè)大學(xué)》2014年碩士論文

【摘要】：多電平逆變器廣泛應(yīng)用于大功率交流調(diào)速、有源濾波器、船舶推進(jìn)等中高壓大功率應(yīng)用場(chǎng)合。與傳統(tǒng)的兩電平逆變器相比，多電平逆變器具有輸入輸出性能好，諧波含量低，開關(guān)損耗低，電磁干擾小等優(yōu)點(diǎn)。雙三電平逆變器雙端供電拓?fù)淇梢耘c五電平逆變器具有同等的電壓輸出能力，輸出電壓是單個(gè)三電平逆變器的兩倍，，且等效開關(guān)頻率加倍，在大功率變頻領(lǐng)域具有明顯優(yōu)勢(shì)。本文針對(duì)基于雙三電平逆變器的開繞組異步電機(jī)矢量控制系統(tǒng)，對(duì)其開繞組異步電機(jī)數(shù)學(xué)模型、開繞組異步電機(jī)仿真建模、SVPWM控制策略、中點(diǎn)電位控制策略、矢量控制系統(tǒng)幾方面進(jìn)行研究。 在分析開繞組異步電機(jī)雙端供電系統(tǒng)電路模型的基礎(chǔ)上，建立了開繞組異步電機(jī)的數(shù)學(xué)模型，基于開繞組異步電機(jī)的數(shù)學(xué)模型，對(duì)開繞組異步電機(jī)進(jìn)行仿真建模，在分析三電平逆變器的原理的基礎(chǔ)上，分析了雙三電平雙端供電的原理，研究線電壓坐標(biāo)系SVPWM算法的基本原理，基于此算法實(shí)現(xiàn)雙三電平逆變器雙端供電結(jié)構(gòu)的SVPWM控制；針對(duì)中點(diǎn)電位的平衡問題，分析了中點(diǎn)箝位式三電平逆變器中點(diǎn)電位波動(dòng)的基本原理，推導(dǎo)出引起中點(diǎn)電位波動(dòng)的中點(diǎn)電流的表達(dá)式，根據(jù)電荷守恒原理建立尋優(yōu)函數(shù)，選擇出最優(yōu)的開關(guān)序列以及復(fù)用矢量的作用時(shí)間；基于轉(zhuǎn)子磁鏈定向的基本原理，針對(duì)定子電流轉(zhuǎn)矩分量和勵(lì)磁分量沒有完全解耦的特點(diǎn)，設(shè)計(jì)一種解耦控制器，最后，基于開繞組異步電機(jī)模型進(jìn)行了開繞組異步電機(jī)矢量控制系統(tǒng)的仿真研究。 在理論分析研究的基礎(chǔ)上，重點(diǎn)對(duì)雙三電平逆變器雙端供電結(jié)構(gòu)SVPWM控制、中點(diǎn)電位的控制以及開繞組異步電機(jī)矢量控制系統(tǒng)進(jìn)行了仿真研究，驗(yàn)證了雙三電平逆變器雙端供電結(jié)構(gòu)的實(shí)用性和正確性。
[Abstract]:Multilevel inverter is widely used in high power AC speed regulation, active filter, ship propulsion and other high power applications. Compared with the traditional two-level inverter, the multilevel inverter has the advantages of good input and output performance, low harmonic content, low switching loss and low electromagnetic interference. The dual-three-level inverter has the same output voltage as the five-level inverter, and the output voltage is twice as high as that of a single three-level inverter, and the equivalent switching frequency is doubled. It has obvious advantages in the field of high-power frequency conversion. Aiming at the vector control system of open-winding asynchronous motor based on two-three-level inverter, the mathematical model of open-winding asynchronous motor, the simulation modeling of open-winding asynchronous motor, the SVPWM control strategy and the neutral-point potential control strategy are discussed in this paper. Several aspects of vector control system are studied. On the basis of analyzing the circuit model of open winding asynchronous motor two-terminal power supply system, the mathematical model of open winding asynchronous motor is established. Based on the mathematical model of open winding asynchronous motor, the open winding asynchronous motor is simulated. On the basis of analyzing the principle of three-level inverter, the principle of double-three-level double-terminal power supply is analyzed, and the basic principle of linear voltage coordinate system (SVPWM) algorithm is studied. Based on this algorithm, the double-terminal power supply structure SVPWM control of dual-three-level inverter is realized. Aiming at the balance of neutral point potential, the basic principle of neutral point potential fluctuation of three-level inverter with neutral point clamp is analyzed, the expression of neutral point current causing neutral point potential fluctuation is deduced, and the optimization function is established according to the principle of charge conservation. The optimal switching sequence and the action time of the multiplexing vector are selected. Based on the basic principle of rotor flux orientation, a decoupling controller is designed for the characteristics that the stator current torque component and the excitation component are not completely decoupled. Based on the open winding asynchronous motor model, the vector control system of open winding asynchronous motor is simulated. On the basis of theoretical analysis and research, the SVPWM control, neutral-point potential control and vector control system of open-winding asynchronous motor are simulated. The practicability and correctness of the dual-terminal power supply structure of dual three-level inverter are verified.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464;TM343

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