Command Generation for Wide-Range Operation of Hysteresis-Controlled Vienna Rectifiers

Hysteresis current controllers inherently present wide bandwidth and have been proposed for application in Vienna rectifiers switching at high frequencies. In such applications, near zero ac input currents are required at no load. Since the hysteresis band is limited by switching losses and delays, controlling low current amplitudes becomes an issue. In this paper, it is described as a suitable alternative to overcome such limitation, satisfying both the control of the power flow at no load and minimum current amplitude requirements. Test results on a 40-A/380-V Vienna rectifier are presented to support the theoretical analysis.