单相三电平PWM整流器控制理论研究

发布时间：2018-04-02 00:29

  本文选题：单相三电平PWM整流器　切入点：控制理论　出处：《西南交通大学》2014年硕士论文

【摘要】：电力电子行业迅速发展,电力供电系统领域、交直交可调电源领域等开始广泛采用各类电力电子装置。但是大多数的电力电子装置并非直接与电网接触,而是通过变流器与电网相连。因此,相关的电力电子应用常常会遇到功率因数较低、电流谐波成分高等不可忽视的问题。本文以单相三电平PWM整流器为研究对象,阐述了PWM整流器的工作原理,并建立了单相三电平PWM整流器的系统数学模型；分析了常见的三种控制技术(滞环电流控制技术、瞬态电流控制技术、预测电流控制技术)以及基于d-q坐标系的电流解耦控制技术。此外,对SPWM调制技术和SVPWM调制技术做了简介。最后采用基于SPWM瞬态电流控制技术、基于SPWM预测电流控制技术和基于S VPWM的d-q电流解耦控制技术,就应用实例建立了MATLAB/SIMULINK仿真环境下的模型,仿真出三种控制方式稳态和动态情况下的数据,针对仿真结果进行了数据分析对比。文中针对单相三电平PWM整流器中存在的交流侧低次谐波问题,分析了其产生的机理及危害,在系统的数理推算后给出了具体方法来消除交流侧低次谐波,并进行了仿真验证。针对三电平PWM整流器中存在的中点电位漂移问题,文中详细分析了其产生的机理,并就其如何解决给出了具体的控制方法,并进行了仿真,验证了其正确性。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461
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本文编号：1698000