Loss and Energy Determination of a 400kW Grid-Connected Supercapacitor Energy Storage System

This paper presents a 400 kW grid-connected supercapacitor energy storage system. The losses of the active Front End including an LCL filter, the DC/DC converter, the supercapacitor storage and the overall system are measured and possibilities to decrease them are identified. Mathematical descriptions of converter losses are presented and combined with a modeling approach for the supercapacitor storage. The resulting model describes the power flows and losses within the overall system as a function of the terminal behavior of the supercapacitor storage.