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

Patent metadata

Field	Value
Publication number	US-11387643-B2
Application number	US-201916959982-A
Country	US
Kind code	B2
Filing date	Dec 31, 2019
Priority date	Mar 27, 2019
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A method, a device, and a system for protecting parallel-connected topology units are provided. A target signal transmitted via the signal synchronization line is obtained, and the target signal is sent to other controllers based on a type of the target signal. If the target signal is a carrier synchronization signal, the current power module is controlled to perform carrier synchronization and to be in a working mode. If the target signal is a power module fault signal, the current power module is controlled to be in a shutdown mode. The signal synchronization lines between the parallel-connected topology units are shared in a time-sharing manner, where the carrier synchronization signal is transmitted if the power module works normally, and the power module fault signal is transmitted if the power module is faulty. The topology units monitor the transmitted target signal in real time for fast synchronous protection.

First claim

The invention claimed is:

1. A method 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, the controller performs signal transmission with at least one of other controllers via a signal synchronization line, and the method for protecting parallel-connected topology units comprises:
obtaining 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;
sending the target signal to the other controllers based on a type of the target signal; and
by multiplexing the signal synchronization line, controlling a current power module to perform carrier synchronization and controlling the current power module to be in a working mode if the target signal is the carrier synchronization signal, and controlling the current power module to be in a shutdown mode if the target signal is the power module fault signal.

2. The method for protecting parallel-connected topology units according to claim 1 , further comprising, if the target signal is the carrier synchronization signal:
determining a fault state of the power module,
if the fault state is a normal state, transmitting the target signal to the other controllers, controlling the current power module to perform carrier synchronization and controlling the current power module to be in the working mode, and
if the fault state is a faulty state, sending the power module fault signal to the other controllers and controlling the current power module to be in the shutdown mode.

3. The method for protecting parallel-connected topology units according to claim 1 , wherein
the controller is a single controller, the single controller is connected to the power module via a state acquisition signal line, the single controller acquires the power module fault signal sent by the power module and sends the power module fault signal via the signal synchronization line, and
the obtaining the target signal transmitted via the signal synchronization line comprises:
acquiring, by the single controller, the carrier synchronization signal or the power module fault signal transmitted via the signal synchronization line, and
determining the power module fault signal or the carrier synchronization signal as the target signal.

4. The method for protecting parallel-connected topology units according to claim 1 , wherein
the controller comprises a first sub-controller and a second sub-controller, the first sub-controller is connected to the second sub-controller via a feedback signal line, the second sub-controller performs signal transmission with at least one of other second sub-controllers via the signal synchronization line, and the second sub-controller is connected to the power module via a state acquisition signal line, and
the second sub-controller obtains the target signal transmitted via the signal synchronization line, if the target signal is the carrier synchronization signal, the second sub-controller acquires a fault state of the power module via the state acquisition signal line, wherein
if the fault state is a normal state, the second sub-controller transmits the target signal to the other second sub-controllers via the signal synchronization line and transmits the target signal to the first sub-controller via the feedback signal line, and the first sub-controller performs carrier synchronization and controls the current power module to be in the working mode, and
if the fault state is a faulty state, the second sub-controller transmits the power module fault signal to the other second sub-controllers via the signal synchronization line and transmits the power module fault signal to the first sub-controller via the feedback signal line, and the first sub-controller controls the current power module to be in the shutdown mode,

if the target signal is the power module fault signal, the second sub-controller sends the target signal to the other second sub-controllers via the signal synchronization line and transmits the target signal to the first sub-controller via the feedback signal line, and the first sub-controller controls the current power module to be in the shutdown mode.

5. 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.

6. The device for protecting parallel-connected topology units according to claim 5 , the processor is configured to execute the executable instructions to:
determine a fault state of the power module if the target signal is the carrier synchronization signal, wherein
if the fault state is a normal state, transmit the target signal to the other controllers, control the current power module to perform carrier synchronization and control the current power module to be in the working mode, and
if the fault state is a faulty state, send the power module fault signal to the other controllers and control the current power module to be in the shutdown mode.

7. The device for protecting parallel-connected topology units according to claim 5 , wherein
the controller is a single controller, the single controller is connected to the power module via a state acquisition signal line, the single controller acquires the power module fault signal sent by the power module and sends the power module fault signal via the signal synchronization line, and the processor is configured to execute the executable instructions to:
acquire, by controller, the carrier synchronization signal or the power module fault signal transmitted via the signal synchronization line, and
determine the power module fault signal or the carrier synchronization signal as the target signal.

8. 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 l

Assignees

• Sungrow Power Supply Co Ltd

Inventors

• Liang Cheng
• Pan Nianan
• Wang Zhicheng
• Cheng Lin
• Sun Longlin
• Feng Jigui

Classifications

• H02H7/267

  for parallel lines and wires · CPC title

• H02H7/1225 Primary

  responsive to internal faults, e.g. shoot-through (avoiding shoot-through H02M1/38) · CPC title

• H02M1/32 Primary

  Means for protecting converters other than automatic disconnection · CPC title