本文選題：準Z源逆變器 + 開關耦合電感��； 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：PWM逆變器為新能源發(fā)電系統以及交流電機驅動系統中的重要組成部分。針對傳統PWM逆變器只能實現降壓逆變等固有的缺點,通過在PWM逆變器直流側增加準Z源網絡,構成了準Z源逆變器。準Z源逆變器不僅具有傳統PWM逆變器的所有功能,而且能夠實現升壓逆變,使PWM逆變器的應用范圍大大拓展。而升壓比是衡量準Z源逆變器升壓能力的關鍵參數,因此研究并改進準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傳統PWM逆變器和直流側準Z源升壓網絡兩部分,分別對前后兩級進行數學模型的建立。采用信號流圖的建模方法重點研究了直流側準Z源網絡數學模型,得到了系統的交流小信號模型。在此基礎上,通過比較不同的直通零矢量調制方法,選擇最大增益SVPWM調制法,并對調制過程引入的三次諧波進行分析與消除,確定了調制方案。在提高升壓能力方面,采用高升壓比開關耦合電感結構對帶有開關電感結構的準Z源逆變器進一步改進。在不增加磁性元件數量的前提下,通過耦合電感的變比,使逆變器的升壓比明顯提高。開關耦合電感結構的工作原理和過程在論文中得到了詳細的研究,并與傳統準Z源逆變器進行了比較。同時詳細給出了具有指導性意義的耦合電感設計過程,進行了仿真研究,驗證了改進方案的正確性。在控制系統方面,本課題以逆變器的小信號模型為基礎,給出了主電路參數設計方法,并采取電流電壓雙閉環(huán)的控制策略,分析了雙閉環(huán)PI調節(jié)器的參數設計方法,仿真結果也對開關耦合電感準Z源逆變器的穩(wěn)定性和動態(tài)性能進行了驗證。
[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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM464

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本文編號：1900383