本文選題：單相三電平PWM整流器　切入點：控制理論　出處：《西南交通大學》2014年碩士論文

【摘要】：電力電子行業(yè)迅速發(fā)展,電力供電系統領域、交直交可調電源領域等開始廣泛采用各類電力電子裝置。但是大多數的電力電子裝置并非直接與電網接觸,而是通過變流器與電網相連。因此,相關的電力電子應用常常會遇到功率因數較低、電流諧波成分高等不可忽視的問題。本文以單相三電平PWM整流器為研究對象,闡述了PWM整流器的工作原理,并建立了單相三電平PWM整流器的系統數學模型；分析了常見的三種控制技術(滯環(huán)電流控制技術、瞬態(tài)電流控制技術、預測電流控制技術)以及基于d-q坐標系的電流解耦控制技術。此外,對SPWM調制技術和SVPWM調制技術做了簡介。最后采用基于SPWM瞬態(tài)電流控制技術、基于SPWM預測電流控制技術和基于S VPWM的d-q電流解耦控制技術,就應用實例建立了MATLAB/SIMULINK仿真環(huán)境下的模型,仿真出三種控制方式穩(wěn)態(tài)和動態(tài)情況下的數據,針對仿真結果進行了數據分析對比。文中針對單相三電平PWM整流器中存在的交流側低次諧波問題,分析了其產生的機理及危害,在系統的數理推算后給出了具體方法來消除交流側低次諧波,并進行了仿真驗證。針對三電平PWM整流器中存在的中點電位漂移問題,文中詳細分析了其產生的機理,并就其如何解決給出了具體的控制方法,并進行了仿真,驗證了其正確性。
[Abstract]:With the rapid development of power electronics industry, various kinds of power electronic devices have been widely used in the field of power supply system and AC direct alternating adjustable power supply, but most of the power electronic devices are not directly in contact with the power grid. Therefore, the related power electronic applications often encounter the problems of low power factor and high current harmonic component. This paper takes the single-phase three-level PWM rectifier as the research object. The working principle of PWM rectifier is described, and the mathematical model of single-phase three-level PWM rectifier is established, and three common control techniques (hysteresis current control, transient current control, transient current control) are analyzed. Predictive current control technology) and current decoupling control technology based on d-q coordinate system. In addition, the SPWM modulation technology and SVPWM modulation technology are introduced. Finally, the transient current control technology based on SPWM is adopted. Based on SPWM predictive current control technology and d-q current decoupling control technology based on S VPWM, the model of MATLAB/SIMULINK simulation environment is established for an application example, and the data of three control modes under steady and dynamic conditions are simulated. In this paper, the mechanism and harm of the low order harmonics in AC side of single-phase three-level PWM rectifier are analyzed. After the mathematical calculation of the system, a concrete method is given to eliminate the low order harmonics on the AC side, and the simulation is carried out. The mechanism of the neutral-point potential drift in the three-level PWM rectifier is analyzed in detail. How to solve the problem is given, and the simulation is carried out to verify its correctness.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM461
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本文編號：1698000