《三电平控制策略研究》-毕业论文设计（学术).doc

湖南大学毕业设计(论文) 第 PAGE I 页 基于三电平逆变器的永磁同步电机的控制策略研究 摘要 近些年来对多电平变频器的开发研究越来越多的运用在运动控制上。多电平技术通过改进变换器自身拓扑结构，无需升降压变压器和均压电路，即可满足电压型逆变器的高电压容量大的要求。由于增加了输出电压电平数，使得输出波形的输出谐波小，各个开关器件所承受的电压应力也较小。因此在交流柔性输电系统和高压变频调速系统中得到了广泛的关注。 本课题基于三电平的电压空间矢量脉宽调制技术SVPWM算法对永磁同步电机进行了控制策略研究。分析永磁同步电动机矢量控制原理并且阐述了永磁同步电动机变频调速的数字矢量控制的实现过程，研究了永磁同步电机三电平SVPWM控制系统仿真模型的建立,利用永磁同步电机三电平SVPWM控制系统在Matlab7.0/Simulink中建立的模型,进行了仿真实验,实验结果表明了永磁同步电机三电平SVPWM控制系统应用的正确性。 关键词：矢量控制 永磁同步电机 电压空间矢量脉宽调制 三电平逆变器 The control strategy of the permanent magnet synchronous motor which is based on the three-level inverter Abstract In recent years, more and more researches of multilevel converter have been applied on motion control. Through improving the topological structure of convertor, multilevel converter doesn’t have to step-up or step-down the transformer and equalizer circuit to meet the requirement of high capacity of the voltage source inverter. As the addition of the number of output voltage level, the output waveform has decreased and the voltage stress of every switching element has been decreased as well. Therefore, multilevel converter has caused close attention on Flexible Alternating Current Transmission Systems (FACTS) and high-voltage frequency converting system. Based on the control policy research of voltage space vector PWM of three-level to permasyn motion, the thesis analyzes the theory of Vector Controlled PMAM System, expounds the implementation procedure of it, investigates the found of simulation model on three-level SVPWM control for permanent magnet synchronous motor system and takes the advantage of three-level SVPWM control system of permanent magnet synchronous motor in the model established in Matlab7.0/Simulink, and conducts a simulation experiment. And the result of simulation experiment has proved the correctness of tri-level voltage SVPWM system of PMSM. Keywords: Permanent magnet synchronous motor Voltage space vector pulse width modulation Vector control