Novel Motor-Kinetic-Energy-Based Power Pulsation Buffer Concept for Single-Phase-Input Electrolytic-Capacitor-Less Motor-Integrated Inverter System

The motor integration of singe-phase-supplied Variable-Speed Drives (VSDs) is prevented by the significant volume, short lifetime, and operating temperature limit electrolytic capacitors required to buffer pulsating power grid. DC-link energy storage requirement eliminated using kinetic as a buffer. proposed concept called Motor-Integrated Power Pulsation Buffer (MPPB), control technique structure are detailed that meet requirements for nominal faulted operation with simple reconfiguration existing controller blocks. A 7.5 KW, motor-integrated hardware demonstrator validated MPPB loss models scroll compressor drive used in auxiliary railway applications. front-end CISPR 11/Class EMI filter, PFC rectifier stage, output-side inverter stage achieved density 0.91 KW L−1 (15 W in−3). grid-to-motor-shaft efficiency exceeded 90% all loads over 5 kW or 66% load, worst-case penalty conventional system only 17%.