Operation, control and performance evaluation of parallel connected DC link series resonant inverter delivering to distributed load

Abstract

DC link series resonance (DCLSR) is a new concept in power conversion and in specific to DC to AC conversion using IGBT. In this work, the operation and control strategies of parallel connected inverters delivering to common/distributed load are investigated. The DC-coupled control of link current from output voltage and load enables the parallel connected inverters to share the load power proportional to its individual inverter capacity with output voltage sinusoidal. The inverter operation and above control strategy and its digital implementation are verified through simulation. The results verify the reliable operation and load sharing of inverters connected in parallel at all loads and transients including short circuit condition. The practical and reliability aspects of this inverter is presented.