A Configurable Multi Input Port Hybrid Inverter Topology With Quadrupled Voltage Gain for PV and Hybrid Applications

Abstract

The presented work demonstrates the three-port inverter configuration for a quadrupled reduction in the operating DC bus voltage compared to conventional inverter topology. Thus, the proposed configuration consists the single inversion stage and operates with single or multiple sources. Irrespective of the source connected at input ports, the three inverters in the tri-inverter configuration synthesize the 512 switching combinations and spread across 61 voltage space locations to realize the load space vector. The switching states are segregated from the space spread not only to realize the maximum voltage gain but also to eliminate the common mode voltage during common DC source operations. In the case of common DC source operation, the CMV eliminated switching combinations ensures the elimination of circulating current with minimum compromise of the voltage gain. The improved voltage gain and eliminated circulating current guarantees the maximum energy yield from source and improved reliability of the converter compared to the conventional inverter. The proposed converter's efficacy and realized space vector switching states in terms of realizable four times voltage gain and the elimination of intra-inverter circulating currents are validated experimentally with single and multiple sources.