三电平逆变器控制算法的研究及仿真

发布时间：2018-01-04 18:42

本文关键词：三电平逆变器控制算法的研究及仿真　出处：《太原理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着能源稀缺和环境恶化问题的日益凸显,如何提高能源利用率成为世界各国普遍关注的一个问题。三电平逆变器因其在高压大功率电动机节能降耗、提高电能利用率上有着显著作用而成为众多科研工作者关注的焦点和研究的热点,而三电平逆变器的控制方法更是人们研究的重点。本文详细讲述了两电平逆变器的工作原理及两电平SVPWM对称调制模式控制算法的基本步骤,其后根据矢量合成的平行四边形定则在成熟的传统两电平SVPWM对称式控制算法的基础上推导了一种新型的两电平SVPWM算法,该算法仅需计算参考矢量位于第一扇区时,其相关矢量的作用时间即可计算出参考矢量位于其它各扇区时,其相关矢量的作用时间。随后,本文以二极管箝位型三电平逆变器为例详细讲述了三电平逆变器的工作原理,三电平SVPWM矢量分解算法的基本步骤。然后将新型的两电平SVPWM控制算法及三电平SVPWM矢量分解算法应用于三电平中,便推导出了一种新型的三电平SVPWM控制算法,该新型的三电平SVPWM控制算法仅需根据第一大扇区内第一小扇区的相关矢量作用时间计算公式,便可求出参考矢量位于三电平矢量平面任意区域内的相关矢量作用时间。同时在MATLAB/Simulink中搭建了传统的两电平SVPWM对称式控制算法、新型的两电平SVPWM算法、三电平SVPWM矢量分解算法、新型的三电平SVPWM算法的仿真模型,仿真结果表明推导的新型的两电平SVPWM算法及新型的三电平SVPWM算法是正确的。最后设计了基于三电平SVPWM矢量分解算法的永磁同步电动机的电流、转速双闭环矢量控制系统并在MATLAB/Simulink中搭建了该控制系统的仿真模型,仿真结果表明该控制系统响应速度快而且具有良好的静、动态特性。
[Abstract]:With the increasing of energy scarcity and environmental degradation, how to improve energy efficiency has become a common concern in the world. Three-level inverter is used in high-voltage and high-power motors to save energy and reduce consumption. The improvement of power utilization efficiency has become the focus and research focus of many researchers, and the control method of three-level inverter is the focus of people's research. In this paper, the principle of two-level inverter and the basic steps of two-level SVPWM symmetrical modulation mode control algorithm are described in detail. Based on the parallelogram rule of vector synthesis, a new two-level SVPWM control algorithm is derived based on the traditional two-level SVPWM symmetric control algorithm. When the reference vector is located in the first sector, the operation time of the correlation vector can be calculated when the reference vector is located in the other sectors. Taking diode clamped three-level inverter as an example, the principle of three-level inverter is described in detail in this paper. The basic steps of the three-level SVPWM vector decomposition algorithm. Then the new two-level SVPWM control algorithm and the three-level SVPWM vector decomposition algorithm are applied to the three-level. A new three-level SVPWM control algorithm is derived. The new three-level SVPWM control algorithm only needs to calculate the time of the correlation vector in the first large sector and the first small sector. The interaction time of the reference vector in any region of the three-level vector plane can be obtained. At the same time, the traditional two-level SVPWM symmetrical control algorithm and a new two-level SVPWM algorithm are built in MATLAB/Simulink. Three-level SVPWM vector decomposition algorithm, a new three-level SVPWM algorithm simulation model. The simulation results show that the new two-level SVPWM algorithm and the new three-level SVPWM algorithm are correct. Finally, the current of permanent magnet synchronous motor based on three-level SVPWM vector decomposition algorithm is designed. The simulation model of the double closed loop vector control system is built in MATLAB/Simulink. The simulation results show that the speed of response of the control system is fast and the control system has good static performance. Dynamic characteristics.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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