English
Basic version of HFVE using a hybrid inverter and connected PV panels with AC connection via a standard grid inverter - also suitable for existing PV plants. The L1 phase is connected to the input of the hybrid inverter, the output of the L1 'inverter is connected to the OM grid. This solution enables an island mode, where the L1 'phase is backed up according to the output power of the inverter. During normal operation, the bypass function allows the passage of the inverter even through significantly higher outputs than the inverter's own output, and the full consumption of the house can be connected to the L1 'phase. In the event of a grid failure, it is necessary to limit consumption according to the maximum power of the inverter - which is one of the tasks of the control system. The hybrid inverter also provides a grid for the grid inverter function in island mode, while also allowing the connected batteries to be charged from the excess energy.
Fig. Basic overview diagram of a typical 1f HFVE configuration with AC coupling of PV panels
Basic components for HFVE control:
❶ Inverter, eg Sunny Boy 2.5 controlled by Foxtrot (communication interface)
❷ 3f fast four-quadrant electricity meter with protective disconnection function on the CIB bus
❸ Inverter, eg Studer Xtender XTM 2600-48 controlled by Foxtrot system (communication interface)
❹ Battery storage, LiFePO4 batteries eg 48 VDC, 100 Ah including BMS