Next generation of AC coupled Hybrid systems - 3 phase parallel operation of grid forming battery inverters

The AC-coupling of components for stand-alone PV-battery-diesel hybrid power systems and the distributed generation in renewable energy micro grids is a challenging task for the control technology. Today’s systems mostly run in master/slave operation with one battery inverter or one genset as the grid master. Extendable distributed power supplies can be considerably improved by introducing multi-master control concepts for hybrid systems that were demonstrated by ISET and SMA for the first time world-wide. In experiments and first pilot installations it was shown that a grid compatible parallel operation of inverters and small standard asynchronous and synchronous motor-generator sets is possible. This control technology has been extended from single phase operation to three phase operation.