基于虚拟磁链的PWM整流器数学模型及仿真

Mathematical model and simulation of PWM rectifier based on virtual flux

分析了PWM整流器工作原理,建立了电压型PWM整流器在αβ,dq坐标系下的数学模型,并在此基础上,通过应用虚拟磁链概念,提出了三相电压型PWM整流器在αβ,dq坐标系下的虚拟磁链模型。此模型输出直流电压动态响应快,能够准确控制输入电流,使其畸变率较低。针对这些不同数学模型,运用MATLAB/SIMULINK开发了PWM整流器仿真模块,通过仿真对各个模型进行比较,仿真结果证明了虚拟磁链模型的正确性和优越性。

The authors discuss the principle of PWM rectifier and present the mathematical model of voltage PWM rectifier. The virtual flux model of three phase high-factor PWM rectifier was put forward under aβ, dq frame refrence by applying the virtual flux conception. Faster dynamical response of output voltage and less total harmonic distortion of input current are obtained. Based on various mathematical models, simulation of PWM rectifier was implemented by using the toolbox of MATLAB/SIMULINK. The advantages and disadvantages were compared through simulation. The virtual flux model is proved through simulation.