Return current sensor for solar modules connected in parallel

摘要

Device for injecting into a current network (2) electrical energy from a plurality of chains (5) each comprising several photovoltaic modules (4) connected in series, with bus lines (8, 9) with connections for each chain to connect the chains (5) in parallel with each other to the debus conduits (8, 9), with a current sensor (10) for each chain (5) that captures at least if a return current flows to the chain ( 5) and with a converter (12) comprising a control system (11), and that injects the electrical energy from the bus lines (8, 9) into the current network (2), where through the control system ( 11) the voltage of the converter system (12) that falls between the bus lines (8, 9) can be adjusted, characterized in that each current sensor (10) communicates to the control system (11) of the converter (12) if a return current flows to the chain (5) that is connected, and where the system Control unit (11) of the inverter (12) reduces the system voltage between bus lines (8, 9) to stop the return current, where after reducing the system voltage between bus lines (8, 9) , the remaining chains (5) continue to supply electrical energy that is injected by the converter (12) into the mains (2) while the reduced system voltage between the bus lines (8, 9) is sufficient to effect an injection of electrical energy in the current network (2).