Research on Vector Control Strategy for PWM Rectifier with Split Capacitor

The topology,working principle,operation mode of three-phase voltage source PWM rectifier with split capacitor are discussed.The mathematical modeling of PWM converter is established.For the real system with neutral line,the mathe-matical model in synchronous rotating(d,q,O) frame is given.According to the operating characteristics of this type of rectifier,the vector control synchronous PI current control scheme and SPWM are adopted here.The parameters design of current-loops and voltage-loop respectively corresponding to different requirement of them is discussed.Three current con-trol schemes for PWM rectifier are analyzed and the general dc voltage control and particular dc offset compensation are also devised.The experimental results are provided for demonstrating the satisfactory control performance and effective re-striction on lower order harmonics.