基于不定频滞环空间矢量电流控制的三相PWM整流器仿真比较研究

Comparative Research on Three-Phase PWM Rectifier Based on Variable-Frequency Hysteresis and Space-Vector Current Control Strategy

针对目前经典电流滞环控制方法的缺陷,详细介绍了将不定频滞环和空间电压矢量相结合的控制方法,包括系统的数学建模、控制原理、重点规则和实现过程等。在Matlab/Simulink软件平台上搭建了系统的仿真模型,通过与传统的电流滞环和单极性PWM控制方法相比较,验证了不定频滞环空间电压矢量控制方法可实现单位功率因数运行,且在降低谐波污染、减小开关频率、加快动态响应速度等方面的优越性,从而为PWM整流器控制提供了新的控制方法,此法可提高系统运行效率,并具有实际应用价值。

In view of the common shortcomings of conventional hysteresis controlling method,this paper proposes a new control strategy for three-phase PWM rectifier,which combines variable-frequency hysteresis current control with space-vector control. The system mathematical model,control mechnism,major principles and implementation process are elaborated. On Matlab /Simulink software platform,a simulation model for the system was established,and the comparation with the traditional current hysteresis and unipolar PWM control method has verified that the variable-frequency hysteresis and space-vector control method can realize unit power factor running,reduce the harmonic pollution,lower switching frequency,accelerate dynamic response and so on,providing a new method for PWM rectifier control. This method is effective in improving the system efficiency and valuable in application.