Method, device and system for protecting parallel-connected topology units

A device for protecting parallel-connected topology units, applied to a system for protecting parallel-connected topology units, wherein the system for protecting parallel-connected topology units comprises topology units connected in parallel, each of the topology units comprises a controller and a power module, and the controller performs signal transmission with at least one of other controllers via a signal synchronization line;

• wherein the device for protecting parallel-connected topology units comprises a memory and a processor, the memory storing executable instructions, and the processor being configured to execute the executable instructions to:
• obtain a target signal transmitted via the signal synchronization line, the target signal being a carrier synchronization signal or a power module fault signal, and the power module fault signal being uploaded to the signal synchronization line in a case that the controller detects that the corresponding power module fails;
• send the target signal to the other controllers based on a type of the target signal;
• and
• by multiplexing the signal synchronization line, control a current power module to perform carrier synchronization and control the current power module to be in a working mode if the target signal is the carrier synchronization signal, and control the current power module to be in a shutdown mode if the target signal is the power module fault signal.

A system for protecting parallel-connected topology units, comprising topology units connected in parallel, each of the topology units comprises a controller and a power module, the controller performs signal transmission with at least one of other controllers via a signal synchronization line, and the controller:

• obtains a target signal transmitted via the signal synchronization line, the target signal being a carrier synchronization signal or a power module fault signal, and the power module fault signal being uploaded to the signal synchronization line in a case that the controller detects that the corresponding power module fails;
• sends the target signal to the other controllers based on a type of the target signal;
• and
• by multiplexing the signal synchronization line, controls a current power module to perform carrier synchronization and controls the current power module to be in a working mode if the target signal is the carrier synchronization signal, and controls the current power module to be in a shutdown mode if the target signal is the power module fault signal.