Modeling for Coupling Modulation in Dual PWM Speed Control Systems and Characteristic Analysis of Interharmonic Currents Injected Into Distribution Networks
The dual PWM AC/DC/AC speed control system injects interharmonic currents into distribution networks. The injected interharmonic currents cause voltage flicker in distribution networks, affect the stable operation of power grids. Firstly, the distortions of spectrum and fluctuation of voltage effective values caused by coupling modulation were analyzed. Secondly, based on Bessel sequential switch functions, a mathematical model of interharmonic currents generated by the Dual PWM speed control system was est...