本文選題：準(zhǔn)Z源逆變器 + 開(kāi)關(guān)耦合電感��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：PWM逆變器為新能源發(fā)電系統(tǒng)以及交流電機(jī)驅(qū)動(dòng)系統(tǒng)中的重要組成部分。針對(duì)傳統(tǒng)PWM逆變器只能實(shí)現(xiàn)降壓逆變等固有的缺點(diǎn),通過(guò)在PWM逆變器直流側(cè)增加準(zhǔn)Z源網(wǎng)絡(luò),構(gòu)成了準(zhǔn)Z源逆變器。準(zhǔn)Z源逆變器不僅具有傳統(tǒng)PWM逆變器的所有功能,而且能夠?qū)崿F(xiàn)升壓逆變,使PWM逆變器的應(yīng)用范圍大大拓展。而升壓比是衡量準(zhǔn)Z源逆變器升壓能力的關(guān)鍵參數(shù),因此研究并改進(jìn)準(zhǔn)Z源逆變器,提高它的升壓能力十分有意義。本課題將逆變器等效為交流側(cè)傳統(tǒng)PWM逆變器和直流側(cè)準(zhǔn)Z源升壓網(wǎng)絡(luò)兩部分,分別對(duì)前后兩級(jí)進(jìn)行數(shù)學(xué)模型的建立。采用信號(hào)流圖的建模方法重點(diǎn)研究了直流側(cè)準(zhǔn)Z源網(wǎng)絡(luò)數(shù)學(xué)模型,得到了系統(tǒng)的交流小信號(hào)模型。在此基礎(chǔ)上,通過(guò)比較不同的直通零矢量調(diào)制方法,選擇最大增益SVPWM調(diào)制法,并對(duì)調(diào)制過(guò)程引入的三次諧波進(jìn)行分析與消除,確定了調(diào)制方案。在提高升壓能力方面,采用高升壓比開(kāi)關(guān)耦合電感結(jié)構(gòu)對(duì)帶有開(kāi)關(guān)電感結(jié)構(gòu)的準(zhǔn)Z源逆變器進(jìn)一步改進(jìn)。在不增加磁性元件數(shù)量的前提下,通過(guò)耦合電感的變比,使逆變器的升壓比明顯提高。開(kāi)關(guān)耦合電感結(jié)構(gòu)的工作原理和過(guò)程在論文中得到了詳細(xì)的研究,并與傳統(tǒng)準(zhǔn)Z源逆變器進(jìn)行了比較。同時(shí)詳細(xì)給出了具有指導(dǎo)性意義的耦合電感設(shè)計(jì)過(guò)程,進(jìn)行了仿真研究,驗(yàn)證了改進(jìn)方案的正確性。在控制系統(tǒng)方面,本課題以逆變器的小信號(hào)模型為基礎(chǔ),給出了主電路參數(shù)設(shè)計(jì)方法,并采取電流電壓雙閉環(huán)的控制策略,分析了雙閉環(huán)PI調(diào)節(jié)器的參數(shù)設(shè)計(jì)方法,仿真結(jié)果也對(duì)開(kāi)關(guān)耦合電感準(zhǔn)Z源逆變器的穩(wěn)定性和動(dòng)態(tài)性能進(jìn)行了驗(yàn)證。
[Abstract]:PWM inverter is an important part of new energy generation system and AC motor drive system. Aiming at the inherent shortcoming that traditional PWM inverter can only realize step-down inverter, a quasi-Z-source inverter is constructed by adding quasi-Z-source network to the DC side of PWM inverter. The quasi-Z-source inverter not only has all the functions of the traditional PWM inverter, but also can realize the boost inverter, which greatly expands the application range of the PWM inverter. The boost ratio is the key parameter to measure the boost capacity of the quasi-Z-source inverter, so it is very meaningful to study and improve the quasi-Z-source inverter. The inverter is equivalent to conventional AC side PWM inverter and DC side quasi Z source boost network in this paper. The mathematical model of DC side quasi Z source network is studied by using the modeling method of signal flow graph, and the AC small signal model of the system is obtained. On this basis, by comparing different direct-pass zero vector modulation methods, the maximum gain SVPWM modulation method is selected, and the third harmonic wave introduced in the modulation process is analyzed and eliminated, and the modulation scheme is determined. In order to improve the boost capacity, the quasi-Z-source inverter with switching inductance structure with high booster ratio is further improved. Without increasing the number of magnetic elements, the boost ratio of the inverter is obviously improved by changing the ratio of coupling inductors. The principle and process of switching coupling inductor structure are studied in detail in this paper, and compared with the traditional quasi-Z source inverter. At the same time, the design process of instructive coupling inductor is given in detail, and the simulation research is carried out to verify the correctness of the improved scheme. In the aspect of control system, based on the small signal model of inverter, the main circuit parameter design method is given, and the control strategy of current and voltage double closed loop is adopted, and the parameter design method of double closed loop Pi regulator is analyzed. The simulation results also verify the stability and dynamic performance of switching coupling inductor quasi Z source inverter.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM464

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本文編號(hào)：1900383