Converter Configurations for Battery Management and Power Control in Standalone Solar PV fed Cascaded Multilevel Inverter

Abstract

Bulk power supply using solar PV (SPV) system is a demanding option. Standalone solar PV system along with battery support isnow apopular option for large and continuous power transfer. In this manuscript, a single-phase cascaded H-Bridge multilevel Inverter (CHBMLI) has been used to address the concern of large power controlalong withbattery management. In this paper, two configurations of solar PV system with CHBMLI have been proposed, one with multiple battery banks sitting on DC side along withbidirectional DC to DC converter and the other one with battery banks employed on AC side with controlled AC/DC converter designed for the same power management. The DC side battery system can be used with multiple units of standard battery charge controllers, whereas in the AC side battery system a common battery bank can be used with controlled AC/DC converter. The sliding mode control has been used for the inverter output AC voltage control. The result of power management using seven-level CHBMLI with two configurations has been shown through the simulation studies carried out in PSCAD 4.2.1 platform. Dynamic operation with transformation in SPV power conditioning at various load condition, along with power control by battery discharging/charging has been shown through the simulation results.