Minimizing Passive Components in High-frequency High-density AC Active Voltage Source Converters

This paper develops design methodology for finding the lower bound of the passive components for AC back-to-back voltage source converters. Compared with numerous previous works focusing on energy storage passives, the proposed approach considers input EMI filters and various operating modes. The spectrum of the pulsating phase-leg voltage with discontinuous space vector modulation scheme (DPWM) is analyzed, based on which the relationship between the switching frequency and the EMI filter parameters is studied. Then the rules for selecting line inductance and DC link capacitance are derived from the consideration of the current ripple and system stability requirement. The impact of DC link ripple current and failure mode operation is also included. The experiment system is constructed and the results show the feasibility of implementing the minimum passive components.