基于矩阵变换器的永磁同步电机直接转矩控制系统研究
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摘要
交一交矩阵变换器可以实现输入电流波形的正弦化,输入功率因数可以调节,没有大体积的直流环节,在交流传动系统中具有良好的应用前景。直接转矩控制的发展使永磁同步电机的调速性能得到极大提高,成为现代传动系统的优选方案。用矩阵变换器驱动永磁同步电机,实现直接转矩控制,是交流传动系统的一种优化组合,具有重要意义。
     本文分析了矩阵变换器的等效交—直—交结构,推导了矩阵变换器交—交直接变换控制规律,即采用输出线电压空间矢量调制和输入相电流空间矢量调制相结合的双空间矢量调制策略。该方法可使矩阵变换器输入电流正弦变化,输入侧功率因数角可正负调节,输出正弦的交流电压,有效抑制谐波,是一种很有发展前途的控制策略。
     在分析永磁同步电机结构及特点的基础上,给出了其数学模型,分析了永磁同步电机直接转矩控制的基本理论;深入研究了矩阵变换器一直接转矩控制方法的基本原理,将矩阵变换器供电永磁同步电机,应用直接转矩控制理论对电机进行调速,构成对电网无污染、高性能的“绿色”交流调速系统。
     在理论研究的基础上,利用MATLAB/SIMULINK软件建立矩阵变换器—永磁同步电机直接转矩控制系统模型,进行仿真研究,并设计实验样机。
AC-AC matrix converters(MC) hold good potentialities in AC drive systems owing to its unity power factor,without the omission of DC segment,and sinusoidal input currents.Permanent magnet synchronous motor(PMSM) has been widely applied in many fields with its simple structure,high power density and fast dynamics.The evolution of direct torque control(DTC) technology has enabled PMSM to possess much better performance and become the preference in modern drive systems.Therefore,using MC to realize the DTC for PMSM is an optimum combination,and it has important significance.
     In the present paper,the equivalent structure of the AC-DC-AC conversion is analyzed.Then the AC-AC direct transformation control rule of MC is deduced by adopting the dual space vector control strategy of MC,which is combined output line voltage space vector modulation and input phase current space vector modulation. This method meets the demand of input sinusoidal current and output sinusoidal voltages.The input side positive and negative power factor angle is adjusted arbitrary. Harmonic is suppressed in a degree.The strategy is advanced in the future.
     Based on analyzing the structure and characteristic of PMSM,its mathematic models are set up and the basic principle of DTC for PMSM is analyzed.The basic principle of MC-DTC is introduced,which is used as a novel method of adjusting speed to control the PMSM fed by MC.This AC timing system is named the nonpolluting and green system.
     The model of DTC for PMSM based on MC is taken with MATLAB/ SIMULINK based on the study of theory,and the experiment equipment is devised.
引文
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