本文選題：Buck三電平直流變換器 + 飛跨電容　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：在高輸入/輸出電壓的功率變換場合，選取具有合適耐壓值的功率開關(guān)器件往往比較困難。多電平變換器利用飛跨電容使得輸入電壓在串聯(lián)的各開關(guān)管之間均分，不但能降低開關(guān)管電壓應(yīng)力和減小輸出濾波器體積，還能提高動態(tài)特性，所以在輸入/輸出電壓較高的中大功率變換場合具有廣泛的應(yīng)用前景。但是，多電平變換器的輸出電壓與各飛跨電容電壓之間存在耦合的關(guān)系，是一個強耦合的非線性系統(tǒng)，所以需要將其解耦成多個單輸入輸出系統(tǒng)，以對飛跨電容電壓和輸出電壓進行獨立的控制。 隨著對開關(guān)變換器的動態(tài)特性和穩(wěn)定性要求不斷提高，一些非線性的控制方法被應(yīng)用到開關(guān)變換器之中�；？刂凭哂袆討B(tài)響應(yīng)快、魯棒性強等特點，，是所有用于開關(guān)變換器的控制策略中魯棒性最強的控制策略之一。與其他控制方法相比，滑模控制對開關(guān)變換器的非線性特征具有天然的適用性。模糊控制不依賴于被控對象的數(shù)學(xué)模型、對被控對象的非線性具有自適應(yīng)能力，但穩(wěn)態(tài)控制精度不高。PID控制具有原理簡單、穩(wěn)定精度高、可靠性好等特點，可是要獲得滿意的控制效果就需要對PID控制器的參數(shù)不斷地進行在線調(diào)整。因此，把模糊控制與PID控制結(jié)合起來，利用模糊控制器對PID控制器的參數(shù)進行調(diào)節(jié)，可充分發(fā)揮它們各自的優(yōu)點，以使控制效果更加完美。 本文詳細分析了Buck三電平直流變換器的基本工作原理，針對飛跨電容電壓閉環(huán)與輸出電壓閉環(huán)耦合的特點，對其進行解耦，以實現(xiàn)對輸出電壓和飛跨電容電壓進行獨立的控制，并建立了Buck三電平直流變換器的數(shù)學(xué)模型。針對Buck三電平直流變換器工作模態(tài)復(fù)雜的特點，介紹了滑模控制及其在開關(guān)變換器中的常用分析方法，設(shè)計出基于等效控制理論的定頻滑模控制器對輸出電壓進行控制，并結(jié)合傳統(tǒng)PID控制與模糊控制的優(yōu)點，設(shè)計出自整定模糊PID控制器對飛跨電容電壓進行控制。在理論研究的基礎(chǔ)上，對所設(shè)計的Buck三電平直流變換器雙閉環(huán)控制系統(tǒng)進行仿真試驗，仿真結(jié)果表明了理論分析的正確性和所設(shè)計控制器的優(yōu)越性。
[Abstract]:In the case of high input / output voltage power conversion, it is difficult to select the power switch with suitable voltage value. The multilevel converter makes use of the flying capacitance to divide the input voltage equally among the switches in series, which can not only reduce the voltage stress and the output filter volume, but also improve the dynamic characteristics. Therefore, it has a wide application prospect in the field of medium and large power conversion with high input / output voltage. However, the output voltage of the multilevel converter is coupled with the voltage of each flyover capacitor, and it is a strongly coupled nonlinear system, so it is necessary to decouple it into a number of single-input and output systems. Independent control of flyover capacitor voltage and output voltage. With the increasing demand for dynamic characteristics and stability of switching converters, some nonlinear control methods have been applied to switching converters. Sliding mode control is one of the most robust control strategies for switching converters because of its fast dynamic response and strong robustness. Compared with other control methods, sliding mode control has a natural applicability to the nonlinear characteristics of switching converter. Fuzzy control does not depend on the mathematical model of the controlled object, and has adaptive ability to the nonlinearity of the controlled object. However, the steady-state control precision is not high. Pid control has the characteristics of simple principle, high stability precision, good reliability and so on. However, in order to obtain satisfactory control effect, the parameters of PID controller need to be continuously adjusted on line. Therefore, the combination of fuzzy control and PID control, the use of fuzzy controller to adjust the parameters of PID controller, can give full play to their respective advantages, in order to make the control effect more perfect. In this paper, the basic working principle of Buck three-level DC / DC converter is analyzed in detail. Aiming at the characteristics of the coupling between the flyover capacitor voltage closed-loop and the output voltage closed-loop, the decoupling is carried out to realize the independent control of the output voltage and the flyover capacitor voltage. The mathematical model of Buck three level DC / DC converter is established. Aiming at the complex mode of Buck three-level DC / DC converter, this paper introduces the sliding mode control and its common analysis method in switching converter, and designs a constant frequency sliding mode controller based on equivalent control theory to control the output voltage. Combined with the advantages of traditional PID control and fuzzy control, a fuzzy PID controller is designed to control the transcapacitor voltage. On the basis of theoretical research, the simulation experiment of the designed Buck three-level DC / DC converter dual-closed-loop control system is carried out. The simulation results show the correctness of the theoretical analysis and the superiority of the designed controller.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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本文編號：1853303