A frequency converter is an essential device for the modern industrial electrician to understand. This device, also known as a variable frequency drive (VFD) or AC drive, controls the speed of an AC ...

However, one device that has revolutionized the way we approach this is the variable frequency drive (VFD). By understanding how adjustable frequency drives work, how they improve energy efficiency, ...

The proposed current ripple prediction and ZVS-based variable switching frequency control are validated in an IGBT-based 15.6 kW three-phase interleaved three-level DC-DC converter, achieving a ...

Abstract: Modular multilevel converter (MMC) has been widely applied in HVDC systems. When MMC is applied in variable-frequency drives, the sub-module (SM) capacitor voltage fluctuation becomes ...