A study on dual-PWM VVVF control system based on SVPWM

摘要

Because of the shortcomings of traditional AC - DC - AC frequency-conversion circuit electrical systems, this thesis tries to design a dual PWM speed control by variable voltage frequency variation (VVVF) control system based on voltage space vector (SVPWM). It can achieve two-way flow of energy, and improve the AC-side current waveform, the system power factor, and dynamic performance of the speed control system. The PWM modulation wave generated by space voltage vector synthesized by the using of multiple vectors, effectively solves the irregularity of the torque ripple and the unstable frequency system switching in low speed. In addition, simulation of the improved system has been conducted and the result proves the correctness and effectiveness of the analysis.