A method and system for communication lockout protection in a high-voltage series system

Abstract

This invention provides a communication lockout protection method and system for a high-voltage series system. The method includes: adding dual communication circuits between any two power units and between any power unit and the control unit; then, acquiring communication status information when any power unit communicates with other power units via a first communication short circuit; sending this communication status information to the control unit; receiving dual communication status information from the control unit, which indicates whether any of the power units has experienced a dual communication anomaly; and when at least one power unit experiences a dual communication anomaly, controlling the power units without the anomaly to lock out. This achieves the goal of triggering synchronous shutdown and lockout of other power units when any power unit malfunctions, preventing the spread of system faults caused by a single power unit failure.

Description

Technical Field

[0001] This invention relates to the field of power system protection technology, and in particular to a communication lockout protection method and system for a high-voltage series system. Background Technology

[0002] A power system conversion unit typically includes a main power conversion circuit and an auxiliary power supply circuit that provides power to the entire board. The auxiliary power supply circuit is powered in the following way: Figure 1 As shown. The auxiliary power supply circuit can draw power from the high-voltage bus, just like the main power conversion circuit, or it can be powered independently by external equipment.

[0003] In a high-voltage multi-unit series system, each unit uses a voltage equalization control strategy to ensure that the voltage of each unit is the same. However, when the power supply system in a certain unit fails, the voltage equalization control strategy of that unit will fail, the equivalent impedance will change, and the failed unit will not be able to achieve normal voltage equalization, thus leading to overvoltage failure. Summary of the Invention

[0004] This application provides a communication lockout protection method and system for a high-voltage series system. By adding communication circuits between any two power units and between any power unit and the control unit, a synchronous shutdown lockout of other power units is triggered when a power unit malfunctions, preventing the fault from spreading.

[0005] In a first aspect, embodiments of this application provide a communication lockout protection method for a high-voltage series system. This method is applied to a high-voltage series system comprising a control unit and multiple power units. Any two power units communicate bidirectionally with each other via a first communication circuit. Each power unit communicates bidirectionally with the control unit via a second communication circuit. The method is executed by any one of the power units and includes: acquiring communication status information when the power unit communicates with other power units via the first communication circuit; sending the communication status information to the control unit; receiving dual communication status information from the control unit, which indicates whether either the first or second communication circuit of any power unit has experienced a communication anomaly; when at least one power unit experiences a communication anomaly in both its first and second communication circuits, that power unit is locked out.

[0006] In other words, a first bidirectional communication circuit is added between any two power units, and a second bidirectional communication circuit is added between any power unit and the controller. A power unit is only considered faulty when both its first and second communication circuits malfunction. This then locks down other power units that are not malfunctioning, preventing fault propagation and reducing the probability of accidental system shutdown and lockup.

[0007] In one possible implementation, receiving dual communication status information from the control unit includes: receiving dual communication status information sent by the control unit through a second communication circuit; or receiving dual communication status information sent by other power units through a first communication circuit.

[0008] In other words, any power unit can communicate directly with the control unit, or it can communicate with the control unit through other power units. Specifically, any power unit can directly receive dual communication status information sent by the control unit, or it can receive dual communication information sent by the control unit through other power units. This ensures that all power units without malfunctions can receive dual communication status information.

[0009] In one possible implementation, after receiving the dual communication status information, the method further includes: sending the dual communication status information to other power units among the multiple power units through the first communication circuit.

[0010] In other words, after receiving the dual communication status information, the power unit sends the received dual communication status information to other power units through the first communication circuit. This allows power units with abnormal second communication circuits but normal first communication circuits to also receive the dual communication status information. Based on this dual communication status information, the power unit determines whether to lock up, thus reducing the probability of accidental shutdown and lockup of the system.

[0011] In one possible implementation, after a power unit is locked, the method further includes sending a lock-up signal to a control unit so that the control unit triggers other power units to lock up based on the lock-up signal.

[0012] In other words, when any power unit locks up due to a dual communication anomaly in other power units, a lock-up signal is sent to the control unit, causing the control unit to lock up the other power units that are not locked up. This prevents the system failure from spreading due to a single power unit failure.

[0013] In one possible implementation, the method further includes: receiving a lock-up signal sent by the control unit via a second communication circuit, the lock-up signal being used to trigger the power unit to lock up.

[0014] In other words, the power unit can trigger locking based on the lock-up signal sent by the control unit. This ensures that when a power unit in the system fails, other power units that have not failed and have not received dual communication status information, or those that have not locked up due to incorrect dual communication status information, can lock up.

[0015] Secondly, embodiments of this application also provide a communication lockout protection method for a high-voltage series system. This method is applied to a high-voltage series system, which includes: a control unit and multiple power units. Any two power units communicate bidirectionally via a first communication circuit, and each power unit communicates bidirectionally with the control unit via a second communication circuit. This method is executed by the control unit and includes:

[0016] The system acquires communication status information when each power unit communicates with other power units in the plurality of power units via a first communication circuit, and obtains first communication status information based on this communication status information. The first communication status information is used to indicate whether the first communication circuit of each power unit in the plurality of power units is malfunctioning. The system acquires communication status information when each power unit in the plurality of power units communicates with the control unit via a second communication circuit, and obtains second communication status information based on this communication status information. The second communication status information is used to indicate whether the second communication circuit of each power unit in the plurality of power units is malfunctioning. The system obtains dual communication status information based on the first and second communication status information, and the dual communication status information is used to indicate whether any power unit in the plurality of power units has communication malfunctions in both its first and second communication circuits. The system sends the dual communication status information to each power unit in the plurality of power units.

[0017] In other words, the control unit acquires the communication status of each power unit with other power units, as well as the communication status of each power unit with itself (the control unit). Then, the control unit generates dual communication status information for each power unit based on the acquired communication status and sends this dual communication status information to each power unit, so that each power unit can determine whether to lock up based on the received dual communication status information.

[0018] In one possible implementation, the method further includes receiving a lock-up signal sent by at least one of the plurality of power units, the lock-up signal indicating that at least one of the plurality of power units has locked up.

[0019] In other words, by receiving the lock-up signal from the power unit that has already locked up, the control unit can determine whether all power units that have not malfunctioned have been locked up.

[0020] In one possible implementation, after receiving a lock-up signal from at least one of the power units, the method further includes: sending a lock-up signal to the power units among the power units that have not triggered lock-up, the lock-up signal being used to trigger the power units among the power units that have not triggered lock-up to lock up.

[0021] In other words, when the controller receives a lock-up signal from any power unit, it controls the other power units that are not locked up to lock up, thus preventing the system failure from spreading due to the failure of a single power unit.

[0022] Thirdly, embodiments of this application provide a high-voltage series system, which includes: a control unit and multiple power units; any two power units among the multiple power units communicate bidirectionally through a first communication circuit, and each power unit among the multiple power units communicates bidirectionally with the control unit through a second communication circuit;

[0023] Each of the multiple power units is used to send communication status information when the power unit communicates with other power units in the multiple power units through the first communication circuit, and sends the communication status information to the control unit.

[0024] The control unit is configured to obtain first communication status information based on the communication status information; the first communication status information is used to indicate whether the first communication circuit of each of the plurality of power units has malfunctioned.

[0025] The control unit is also used to acquire communication status information of each of the multiple power units when communicating with the control unit through the second communication circuit, and to obtain the second communication status information of the multiple power units based on the communication status information; the second communication status information is used to indicate whether the second communication circuit of each of the multiple power units has malfunctioned.

[0026] The control unit is also used to determine whether there is a communication abnormality in the first communication circuit and the second communication circuit of each of the multiple power units based on the first communication status information and the second communication status information; when at least one of the multiple power units has a communication abnormality in both the first communication circuit and the second communication circuit, the control unit controls the power units that have not had a communication abnormality to lock up according to the communication information sent by the control unit.

[0027] In one possible implementation, the first communication circuit is any one of a serial communication circuit, an optical fiber communication circuit, a controller area network communication circuit, or an Ethernet communication circuit; the second communication circuit is any one of a serial communication circuit, an optical fiber communication circuit, a controller area network communication circuit, or an Ethernet communication circuit.

[0028] In one possible implementation, after at least one of the multiple power units triggers a lock-up, it sends a lock-up signal to the control unit.

[0029] In one possible implementation, the control unit is also used for:

[0030] A lock-up signal is sent to each of the multiple power units via a second communication circuit, so that the power unit that receives the lock-up signal triggers lock-up.

[0031] In one possible implementation, the control unit is also used for:

[0032] The dual communication status information is obtained based on the first communication status information and the second communication status information. This dual communication status information is used to indicate whether a communication abnormality has occurred in the high-voltage series system.

[0033] In one possible implementation, at least one of the power units is further used for:

[0034] The receiving control unit sends dual communication status information via the second communication circuit, and triggers the power unit to lock up based on this dual communication status information; or...

[0035] Receive dual communication status information sent by other power units through the first communication circuit, and trigger the power unit to lock up based on the dual communication status information; or,

[0036] The power unit is triggered to lock up based on a lock-up signal sent by the receiving control unit through the second communication circuit.

[0037] In one possible implementation, after at least one power unit among the plurality of power units receives the dual communication status information sent by the control unit through the second communication circuit, at least one power unit among the plurality of power units further performs the following:

[0038] The first communication circuit sends dual communication status information to other power units.

[0039] Fourthly, embodiments of this application provide a power electronic transformer, characterized in that the transformer includes the high-voltage series system described in the third aspect.

[0040] Fifthly, embodiments of this application provide a computer-readable medium storing instructions that, when executed on a computer, cause the computer to perform the method provided in the first or second aspect.

[0041] In a sixth aspect, embodiments of this application provide a computer program product containing instructions that, when executed on a computer, cause the computer to perform the method provided in the first or second aspect.

[0042] In a seventh aspect, embodiments of this application provide a chip including a memory and a processor. The memory is used to store computer instructions, and the processor is used to call and execute the computer instructions from the memory to perform a method in the first aspect and any possible implementation thereof, or to perform a method in the second aspect and any possible implementation thereof. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic diagram of the power supply method for the auxiliary power supply of the power unit in a high-voltage series system;

[0045] Figure 2 This is a schematic diagram of a high-voltage series system containing n power units;

[0046] Figure 3 This is a schematic diagram of the voltage equalization equivalent circuit in a high-voltage series system.

[0047] Figure 4 A schematic diagram of a high-voltage series system powered by wireless transmission;

[0048] Figure 5 This is a schematic diagram of a high-voltage series system provided in an embodiment of the present invention.

[0049] Figure 6 A schematic diagram of the structure of a power unit in a high-voltage series system provided in an embodiment of this invention application;

[0050] Figure 7a This is a schematic diagram of another high-voltage series system provided in an embodiment of the present invention.

[0051] Figure 7b A communication status determination logic diagram for Cell1-Cell7 provided in an embodiment of this invention application;

[0052] Figure 8a This is a schematic diagram of another high-voltage series system provided in an embodiment of the present invention.

[0053] Figure 8b Another communication status determination logic diagram for Cell1-Cell7 provided in an embodiment of this invention application;

[0054] Figure 9a This is a schematic diagram of another high-voltage series system provided in an embodiment of the present invention.

[0055] Figure 9b A communication status determination logic diagram for Cell1-Cell7 provided in an embodiment of this invention application;

[0056] Figure 10a This is a schematic diagram of another high-voltage series system provided in an embodiment of the present invention.

[0057] Figure 10b A communication status determination logic diagram for Cell1-Cell7 provided in an embodiment of this invention application;

[0058] Figure 11 This is a schematic diagram of another high-voltage series system provided in an embodiment of the present invention.

[0059] Figure 12 A schematic diagram illustrating the transmission process of communication status data among various power units in a high-voltage series system, provided as an embodiment of this invention.

[0060] Figure 13 A schematic diagram of a dual communication state determination logic provided in an embodiment of this invention application;

[0061] Figure 14 A flowchart illustrating a communication lockout protection method for a high-voltage series system provided in an embodiment of this invention application;

[0062] Figure 15 This is a flowchart illustrating the lock-up logic of a power unit, as provided in an embodiment of this invention. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0064] In the description of the embodiments in this application, any embodiment or design that is “exemplary,” “for example,” or “by way of example” should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as “exemplary,” “for example,” or “by way of example” is intended to present the relevant concepts in a concrete manner.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0066] Before introducing the solution of this invention application, the key terms used in the embodiments of this invention application will be explained.

[0067] Power cell: refers to the unit that receives mains voltage input and outputs power.

[0068] Control unit (Pack): Used to receive and process data sent by the power unit, and send data back to the power unit to control the power unit.

[0069] Lock-up: This refers to sending a disable signal to the power supply's control chip to shut it down, thus completely stopping the power supply from operating. This control is unidirectional and irreversible. The disable signal will only disappear after the power input side is completely disconnected.

[0070] In such Figure 2 In the high-voltage series system shown, n power units are connected in series, and the input voltage is Vin. One power unit can be considered equivalent to one resistor. Figure 2 The high-voltage series system shown can be equivalent to multiple resistors connected in series. The equivalent circuit is as follows: Figure 3 As shown.

[0071] Reference Figure 3 The voltage equalization equivalent circuit shown has the following characteristics when the voltage equalization control strategy is in effect:

[0072] R1 = R2 = R3 = ... = Rn

[0073] Therefore, the voltage of each power unit is:

[0074] V Cell =V in / n

[0075] Among them, V in This represents the total input voltage of the system; n represents the number of power units.

[0076] When a power unit fails due to a short circuit, its equivalent impedance increases (and becomes greater than the equivalent impedance of other normal power units). At this time, the voltage across the power unit will be much higher than that of other power units, resulting in overvoltage behavior, and the fault will spread to other power units.

[0077] Currently, there is a solution to prevent a fault in one power unit from spreading to other power units in a high-voltage series system. This solution is as follows: Figure 4 As shown, the auxiliary power supply for each power unit draws power from the outside via wireless transmission. If the auxiliary power supply of one power unit fails, it will not affect the impedance of the other power units. The other power units can still maintain impedance balance, thus ensuring equal voltage across all power units and preventing overvoltage.

[0078] However, the above solutions require an additional wireless power supply for each power unit, significantly increasing costs. Furthermore, implementing the required isolation structure between the added external power supply and the power unit, ensuring proper high and low voltage isolation, is difficult and results in a large size. This application provides a high-voltage series system. In this system, a control unit is added, along with bidirectional communication circuits between power units and between power units and the control unit. When the bidirectional communication circuits between the same power unit and other power units, as well as between the power unit and the control unit, malfunction, it can be determined that the auxiliary power supply of that power unit has failed. To prevent the system from escalating due to a single power unit failure, it is necessary to shut down other power units that are not experiencing failures for protection. The solution provided in this application will now be described in detail.

[0079] Figure 5 A high-voltage series system is provided as an embodiment of this application. For example... Figure 5 As shown, the system includes multiple power units (Cell1-Celln) connected in series and a control unit (PACK). Any two power units are connected via a first communication circuit. Any one power unit is connected to the control unit via a second communication circuit. The first and second communication circuits can be of the same or different types. In one possible example, the communication method of the first and second communication circuits can be any one of serial communication, fiber optic communication, Controller Area Network (CAN) communication, or Ethernet communication.

[0080] Each of the multiple power units acquires communication status information when communicating with other power units through the first communication circuit, and sends the acquired communication status information to the control unit.

[0081] The control unit obtains first communication status information based on the communication status information received from multiple power units. This first communication status information includes the communication status of the first communication circuit of each power unit.

[0082] The control unit is also used to acquire communication status information of each power unit communicating with the control unit through a second communication circuit, and to obtain second communication status information based on this communication status information. The second communication status information includes the communication status of the second communication circuit of each power unit.

[0083] Then, the control unit determines the dual communication status information of each power unit among the multiple power units based on the acquired first and second communication status information. When at least one power unit among the multiple power units experiences a dual communication anomaly, the control unit locks the power units that have not experienced a dual communication anomaly.

[0084] It should be noted that, in the embodiments of this invention, dual communication anomaly refers to an anomaly occurring in both the first and second communication circuits of any power unit. Specifically, an anomaly in the first communication circuit means that the first communication circuits of any power unit and all its adjacent power units experience an anomaly.

[0085] In one possible example, a schematic diagram of the structure of each power unit in a high-voltage series system is shown below. Figure 6 As shown. Each power unit includes a power conversion module and an auxiliary power supply module. The auxiliary power supply module draws power from the main circuit (bus). When at least one power unit in the high-voltage series system fails, the auxiliary power supply of the power units that are not faulty in the high-voltage system is shut down, making the output of the auxiliary power supply of that power unit zero (i.e., Vout = 0). Next, based on Figure 5 The high-voltage series system shown is described below, along with its communication status. This includes two scenarios: normal communication and abnormal communication.

[0086] In this embodiment, a serial communication circuit is used as the first communication circuit, and an optical fiber communication circuit is used as the second communication circuit. The high-voltage series system illustrated in this embodiment includes seven power units. Any two power units communicate bidirectionally via a serial communication circuit. Each power unit and the control unit communicate bidirectionally via an optical fiber communication circuit. In this embodiment, the number of power units in the high-voltage series system and the types of the first and second communication circuits are merely illustrative. This embodiment does not limit the number of power units in the high-voltage series system or the types of the first and second communication circuits.

[0087] 1. The high-voltage series system is communicating normally.

[0088] Normal communication in each power unit of a high-voltage series system includes: both the first and second communication circuits of each power unit are normal, or one of the first and second communication circuits of each power unit is abnormal.

[0089] (1) The first and second communication circuits of each power unit are normal.

[0090] like Figure 7a As shown, this high-voltage series system includes seven power units. Any power unit can bidirectionally transmit information with other power units via a serial communication circuit. Specifically, the first and seventh power units form a bidirectional communication circuit. The information transmitted between power units can include their respective serial communication status. Through this bidirectional circuit, each power unit is aware of the serial communication status of the other power units. Furthermore, any power unit and the control unit can bidirectionally transmit information via an optical fiber communication circuit. The control unit can obtain the optical fiber communication status information between each power unit and the control unit.

[0091] Each power unit sends its acquired serial communication status information to the control unit. The control unit generates dual communication status information based on the serial communication status information sent by each power unit and the acquired fiber optic communication status information of each power unit. This dual communication status information indicates whether any of the power units has malfunctioning serial communication and fiber optic communication circuits. The control unit then sends the dual communication status information to each power unit, allowing any power unit to determine the communication status of other power units based on the dual communication status information sent by the control unit. When any power unit determines that the serial communication and fiber optic communication circuits of other power units are normal, that power unit operates normally, and the auxiliary power supply remains on.

[0092] In one possible example, the serial communication status information of each power unit and the fiber optic communication information of each power unit are as follows: Figure 7b As shown, the number "1" represents normal communication of the power unit, and the number "0" represents abnormal communication. After receiving the serial communication status information sent by each power unit, the control unit generates first communication status information based on the serial communication status information of each power unit. The control unit acquires the fiber optic communication status information of each power unit and generates second communication status information based on the acquired fiber optic communication status information of each power unit. An OR operation is performed on the first and second communication status information to obtain the dual communication status information of each power unit in the high-voltage series system.

[0093] (2) The first communication circuit between the fourth power unit and its adjacent power unit malfunctioned.

[0094] It should be noted that the serial communication failure of the fourth power unit can be due to a problem in the serial communication circuit between the fourth and fifth power units, a problem in the serial communication circuit between the fourth and third power units, or a problem in the serial communication circuits between the fourth and third power units and the fifth power unit. In this embodiment, the failure of the serial communication circuit between the fourth and fifth power units will be used as an example for explanation.

[0095] like Figure 8a As shown, a problem occurred in the bidirectional serial communication circuit between the fourth and fifth power units, causing the fifth, sixth, and seventh power units to be unable to receive serial communication status information from the fourth, third, second, and first power units. Similarly, the first, second, third, and fourth power units also could not receive serial communication status information from the fifth, sixth, and seventh power units. However, because the fiber optic communication circuits between the first, second, third, fourth, fifth, sixth, and seventh power units and the control unit were functioning normally, each power unit could transmit its own serial communication status information to the fifth, sixth, and seventh power units through the control unit. Therefore, any one of the first, second, third, fourth, fifth, sixth, and seventh power units could receive serial communication status information from all the other power units.

[0096] Any power unit between the first and seventh power units can transmit its serial communication status information to the control unit via an optical fiber communication circuit. The control unit generates first communication status information based on the received serial communication status information from each power unit, which includes the serial communication status of each power unit with other power units.

[0097] Furthermore, the control unit acquires the fiber optic communication status information between each power unit and the control unit, and generates second communication status information based on the acquired fiber optic communication status information. Then, the control unit obtains the dual communication status information of each power unit in the high-voltage series system based on the first and second communication status information. The control unit sends the generated dual communication status information to each power unit in the high-voltage series system through the fiber optic communication circuit. Since each power unit can receive the dual communication status information, and the received dual communication status information is normal, each power unit operates normally, and the auxiliary power supply is not turned off.

[0098] In one possible example, the serial communication status information of each power unit, the first communication status information generated by the control unit, and the second communication status information are as follows: Figure 8b As shown, an OR operation is performed on the first and second communication status information to obtain the dual communication status information of each power unit in the high-voltage series system. The communication status of each power unit indicated in this dual communication status information is normal.

[0099] (3) The second communication circuit between the fourth power unit and the control unit malfunctioned.

[0100] like Figure 9a As shown, any power unit can bidirectionally transmit information with other power units via a serial communication circuit between power units. Specifically, the first power unit and the seventh power unit form a bidirectional communication circuit. The information transmitted between power units can include their respective serial communication status. Through this bidirectional circuit, each power unit can learn about the serial communication status of other power units. Any power unit can obtain its own serial communication status information.

[0101] The control unit and multiple power units communicate bidirectionally via fiber optic communication circuits. Each power unit uploads its acquired serial communication status information to the control unit through these circuits. However, due to a malfunction in the fiber optic communication circuit between the fourth power unit and the control unit, the fourth power unit is unable to upload its acquired serial communication status information to the control unit.

[0102] The control unit generates first communication status information based on the serial communication status information uploaded by power units other than the fourth power unit. This first communication status information includes the serial communication status of each power unit with other power units. Further, the control unit acquires the fiber optic communication status information between each power unit and the control unit, and generates second communication status information based on this acquired fiber optic communication status information. Then, the control unit obtains the dual communication status information of each power unit in the high-voltage series system based on the first and second communication status information. The control unit sends the generated dual communication status information to each power unit in the high-voltage series system via the fiber optic communication circuit.

[0103] Although a malfunction in the fiber optic communication circuit between the fourth power unit and the control unit prevented the fourth power unit from receiving the dual communication status information sent by the control unit, the fifth and third power units could then transmit their dual communication status information to the fourth power unit via serial communication after the control unit sent the information to the other power units. This ensured that all power units in the high-voltage series system could receive the dual communication status information, and that the received information was normal. Therefore, all power units operated normally, and the auxiliary power supply remained operational.

[0104] In one possible example, the serial communication status information of each power unit, the first communication status information generated by the control unit, and the second communication status information are as follows: Figure 9b As shown, an OR operation is performed on the first and second communication status information to obtain the dual communication status information of each power unit in the high-voltage series system. The communication status of each power unit indicated in this dual communication status information is normal.

[0105] (4) The first communication circuit between the fourth power unit and an adjacent power unit malfunctions, and the second communication circuit between the fourth power unit and the control unit malfunctions.

[0106] like Figure 10a As shown, a malfunction occurred in the bidirectional serial communication circuit between the fourth power unit and the third power unit, causing the fourth power unit to be unable to receive information sent by the first, second, and third power units through the serial communication circuit. Similarly, a malfunction occurred in the bidirectional fiber optic communication circuit between the fourth power unit and the control unit, preventing the fourth power unit from sending information to or receiving information from the control unit via the fiber optic communication circuit.

[0107] Each power unit transmits information bidirectionally through a serial communication circuit with other power units. Specifically, each power unit can obtain the serial communication status information between itself and other power units via the serial communication circuit. Then, each power unit sends the obtained serial communication status information to the control unit.

[0108] The control unit receives serial communication status information from each power unit via an optical fiber communication circuit and acquires the optical fiber communication status information between each power unit and the control unit. Then, the control unit generates first communication status information based on the received serial communication status information from each power unit. The control unit then generates second communication status information based on the acquired optical fiber communication status information.

[0109] The control unit obtains the dual communication status information of each power unit in the high-voltage series system based on the first and second communication status information. The control unit then transmits the generated dual communication status information to each power unit in the high-voltage series system via an optical fiber communication circuit.

[0110] Although an anomaly in the fiber optic communication circuit between the fourth power unit and the control unit prevents the fourth power unit from receiving information sent by the control unit, and an anomaly in the serial communication circuit between the fourth and third power units prevents the fourth power unit from receiving information sent by the first, second, and third power units through the serial communication circuit between the fourth and third power units, the control unit will still send the received serial communication status information and the generated dual communication status information to the other power units communicating with the control unit after each power unit sends its acquired serial communication status information to the control unit. In this embodiment, the fifth power unit can receive the serial communication status information and dual communication status information of the first, second, and third power units sent by the control unit, and then send the received status information and dual communication status information to the fourth power unit. That is, each power unit in the high-voltage series system can receive the serial communication status information and dual communication status information of the other power units. Therefore, each power unit operates normally, and the auxiliary power supply is not turned off.

[0111] In one possible example, the serial communication status information of each power unit, the first communication status information generated by the control unit, and the second communication status information are as follows: Figure 10b As shown, an OR operation is performed on the first and second communication status information to obtain the dual communication status information of each power unit in the high-voltage series system. The communication status of each power unit indicated in this dual communication status information is normal.

[0112] In this embodiment of the invention, a bidirectional first communication circuit is added between power units, and a bidirectional second communication circuit is added between the power unit and the control unit. This ensures that if the first or second communication circuit of one power unit malfunctions, the communication of the entire high-voltage series system will not be affected. Alternatively, if both the first and second communication circuits on either side of one power unit malfunction, the communication of the entire high-voltage series system will not be affected.

[0113] 2. Communication abnormality in the high-voltage series system.

[0114] In a high-voltage series system, a communication anomaly occurs when a first bidirectional communication circuit is added between power units and a second bidirectional communication circuit is added between a power unit and a control unit. Specifically, an anomaly in the first communication circuit of a power unit means that the first communication circuit of that power unit is also experiencing an anomaly with its adjacent power units.

[0115] like Figure 11 As shown, a malfunction occurred in the bidirectional serial port circuit between the fourth and fifth power units, causing the fifth, sixth, and seventh power units to be unable to receive serial communication status information from the fourth, third, second, and first power units. Similarly, a malfunction occurred in the fiber optic communication circuit between the fourth and third power units, preventing the first, second, and third power units from receiving serial communication status information from the fourth, fifth, sixth, and seventh power units. Finally, a malfunction occurred in the fiber optic communication circuit between the fourth power unit and the control unit, preventing the fourth power unit from sending its own serial communication status information to the control unit and from receiving information from the control unit via the fiber optic communication circuit.

[0116] In one example, the auxiliary power supply of the fourth power unit fails, causing its equivalent resistance to increase and the corresponding bus voltage to rise. This increased bus voltage leads to communication anomalies between the fourth power unit and the fifth, third, and control units (the increased equivalent resistance of the fourth power unit results in a voltage significantly higher than other power units, causing overvoltage behavior, equivalent to a disconnection between the fourth and fifth / third / control units). At this point, the serial communication status information received by the first, second, third, fifth, sixth, and seventh power units is abnormal, and the fiber optic communication status information received by the control unit is also abnormal. The first, second, third, fifth, sixth, and seventh power units send the received serial communication status information to the control unit. The control unit generates dual communication status information based on the serial communication status information sent by each power unit and the received fiber optic communication status information. This dual communication status information indicates whether a communication anomaly has occurred in the high-voltage series system. The control unit then sends the generated dual communication status information to each power unit. Each power unit determines whether to execute a lock-up command and shut down the power supply based on the received dual communication status information.

[0117] In one possible example, after any power unit executes a lock-up command and shuts down its auxiliary power supply, it also needs to send a lock-up signal to the control unit. This lock-up signal indicates that the power unit has been locked. After receiving the lock-up signal, the control unit needs to send the received lock-up signal to other power units that have not sent lock-up signals, so that the other power units that have not sent lock-up signals can execute the lock-up command.

[0118] In one possible example, when a communication anomaly occurs in a high-voltage series system, the transmission process of communication status data between the various power units in the system is as follows: Figure 12 As shown. (Refer to...) Figure 12 The serial communication status information received by each power unit is as follows: Figure 12 Data 1 is shown in the diagram. Data bits 1-7 represent the communication status between the first power unit and the seventh power unit. Due to a fault in the fourth power unit, both its serial and fiber optic communication are abnormal. Therefore, the fourth power unit cannot obtain communication information from other power units, and vice versa.

[0119] The control unit receives serial communication status information from each power unit. Then, it performs an OR operation on the received serial communication status information from each power unit to obtain first communication status information. The generated first communication status information is as follows: Figure 12 Data 2 is shown in the figure.

[0120] The control unit acquires the fiber optic communication information of each power unit and generates second communication status information based on the acquired fiber optic communication information of each power unit. The generated second communication status information is as follows: Figure 12 Data 3 is shown in the table. An OR operation is performed on the first and second communication status information to obtain dual communication status information. The dual communication status determination logic for each power unit is as follows: Figure 13 As shown. According to Figure 13 The dual communication state determination logic diagram shown determines the dual communication state of each power unit, obtaining the dual communication state information of each power unit as follows: Figure 12 As shown in data 4, when the serial communication and fiber optic communication status values ​​of any power unit (Cell) are both 0, the rightmost output terminal is triggered to output 0.

[0121] Furthermore, such as Figure 12 As shown, the dual communication status information (data 4) includes data bits 1-8. Data bits 1-7 in the dual communication status information represent the dual communication status of each power unit, and data bit 8 represents the overall integrated communication status of all power units. In one example, a data bit value of "1" indicates normal dual communication, and a data bit value of "0" indicates communication failure. Performing an AND operation on the data bit values ​​of data bits 1 to 7 yields the data bit value of data bit 8.

[0122] Then, the control unit sends the generated dual communication status information to each power unit through the fiber optic communication circuit. The dual communication status information received by each power unit is as follows: Figure 12 As shown in data 5, after receiving the dual communication status information, each power unit determines whether a lock-up command needs to be executed based on the 8-bit data value in the dual communication status information. Furthermore, after receiving the dual communication status information, each power unit also needs to forward the received dual communication status information to other power units via a serial communication circuit, so that other power units can determine whether a lock-up command needs to be executed based on this dual communication status information. The dual communication status information transmitted by the power unit via serial communication is as follows: Figure 12 The data in Figure 6 is shown.

[0123] It should be noted that after the power unit receives the dual communication status information sent by the control unit, it forwards the received dual communication status information to other power units through the serial port circuit, ensuring that as many power units as possible can receive the dual communication information (ensuring that power units with abnormal fiber optic communication circuits but normal serial communication circuits can receive the dual communication status information).

[0124] In one possible example, the control unit can send dual communication status information containing the communication status of each power unit to each power unit. Alternatively, the control unit can send only the data bits from the dual communication status information that indicate the overall integrated communication status of each power unit to each power unit.

[0125] In this embodiment, by adding communication circuits between any two power units and between any power unit and the control unit, a synchronous shutdown and lock-up of other power units is triggered when a power unit malfunctions, preventing the spread of the fault. Furthermore, by adding dual communication circuits to the high-voltage series system, the probability of power unit erroneous shutdown and lock-up in the high-voltage series system is reduced.

[0126] Figure 14 This is a flowchart illustrating a communication lockout protection method for a high-voltage series system provided in an embodiment of this application. Figure 14 As shown, the method includes steps S1401-S1406.

[0127] Step S1401: Add a first communication circuit between two adjacent power units to enable bidirectional communication between the two adjacent power units.

[0128] Step S1402: A second communication circuit is added between each power unit and the control unit to enable bidirectional communication between any power unit and the control unit.

[0129] The first communication circuit and the second communication circuit can be of the same type or different types. In one possible embodiment, the first communication circuit can be a serial communication circuit, and the second communication circuit can be an optical fiber communication circuit.

[0130] Step S1403: Obtain the communication status information of each power unit when communicating with other power units through the first communication circuit, and obtain the first communication status information based on the communication status information.

[0131] The serial communication status information of each power unit with other power units is acquired, and then the obtained serial communication status information is sent to the control unit. The control unit performs an OR operation on the received serial communication status information to obtain the first communication status information.

[0132] Step S1404: Obtain the communication status information of each power unit when communicating with the control unit through the second communication circuit, and obtain the second communication status information of multiple power units based on the communication status information.

[0133] Step S1405: Determine whether there is a communication abnormality in the first communication circuit and the second communication circuit of each of the multiple power units based on the first communication status information and the second communication status information.

[0134] The control unit performs an OR operation on the first and second communication status information to obtain dual communication status information. The dual communication status information is as follows: Figure 12 Data 4 in the diagram includes data bits 1-8. Data bits 1-7 in the dual communication status information represent the dual communication status of each power unit, while data bit 8 represents the overall integrated communication status of all power units. In one example, a data bit value of "1" indicates normal dual communication, and a data bit value of "0" indicates communication failure. Performing an AND operation on the data bit values ​​from data bits 1 to data bits 7 yields the data bit value of data bit 8.

[0135] Step S1406: When at least one of the power units experiences a communication failure in both its first and second communication circuits, the power units that do not experience a communication failure are locked.

[0136] The control unit sends the received dual-communication status information to each power unit via the second communication circuit. Upon receiving the dual-communication status information, each power unit checks data bit 8. If data bit 8 in the received dual-communication status information is "1", it indicates that the dual-communication status of each power unit in the high-voltage series system is normal. In this case, each power unit operates normally. If data bit 8 in the received dual-communication status information is "0", it indicates that at least one power unit in the high-voltage series system has an abnormal dual-communication status. In this case, the power unit executes a lock-up command and shuts down the auxiliary power supply. After executing the lock-up command, the power unit also needs to send a lock-up signal to the control unit. This lock-up signal indicates that the power unit has triggered a lock-up operation. Furthermore, after receiving the lock-up signal, the control unit also needs to send lock-up signals to the power units that did not send lock-up signals, so that the power units that received the lock-up signals will execute lock-up operations.

[0137] After receiving the dual communication status information sent by the control unit, the power unit also needs to pass the dual communication status information to the serial communication circuit to send it to other power units, so as to ensure that all power units that have not experienced dual communication abnormalities can receive the dual communication status information.

[0138] In one possible example, the power unit lock-up process is described. Figure 15 This is a flowchart of the lock-up logic for the power unit. It includes steps S1501-S1507.

[0139] In step S1501, the power unit judges the received information. When the received information is a lock-up signal, step S1506 is executed; when the received information is dual communication status information, step S1502 is executed.

[0140] The information received by the power unit can be a lock-up signal sent by the control unit through the fiber optic communication circuit, dual communication status information sent by the control unit through the fiber optic communication circuit, or dual communication status information sent by other power units through the dual communication serial port communication circuit.

[0141] Step S1502: Determine whether the received information is dual communication status information received through the fiber optic circuit. If yes, proceed to step S1503; otherwise, proceed to step S1504.

[0142] Step S1503: Judge the dual communication status information. If the received dual communication status information is abnormal, execute step S1506; if the received dual communication status information is normal, execute step S1507.

[0143] Step S1504: Determine whether the received information is dual communication status information received through the serial port circuit. If yes, proceed to step S1505; otherwise, proceed to step S1507.

[0144] Step S1505: Determine the dual communication status information. If the received dual communication status information is abnormal, proceed to step S1506; if the received dual communication status information is normal, proceed to step S1507.

[0145] In step S1506, the power unit executes a lock-up command, shuts down the auxiliary power supply within the power unit, and sends a lock-up signal to the control unit.

[0146] In step S1507, the power unit operates normally and does not lock up.

[0147] After receiving the lock-up signal from the power unit, the control unit sends the lock-up signal to other power units that have not sent a lock-up signal.

[0148] After receiving the lock-up signal from the power unit, the control unit sends the lock-up signal to other power units that have not sent a lock-up signal.

[0149] In this embodiment of the application, a power electronic transformer is also provided, which includes... Figure 5 The high-voltage series system shown.

[0150] The method steps in the embodiments of this application can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can reside in an ASIC.

[0151] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0152] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

Claims

1. A communication lockout protection method for a high-voltage series system, characterized in that, The method is applied to a high-voltage series system, the system comprising: a control unit and multiple power units, wherein any two power units communicate bidirectionally via a first communication circuit, and each power unit and the control unit communicate bidirectionally via a second communication circuit; the method is executed by any one of the power units, and the method includes: The communication status information of the power unit when it communicates with other power units among the plurality of power units through the first communication circuit is obtained, and the communication status information is sent to the control unit. The system receives dual communication status information from the control unit, which is used to indicate whether either the first or second communication circuit of any of the plurality of power units has experienced a communication anomaly. When at least one of the power units experiences a communication failure in both its first and second communication circuits, the power unit is locked.

2. The method according to claim 1, characterized in that, The receipt of dual communication status information from the control unit includes: Receive dual communication status information sent by the control unit through the second communication circuit; or Receive dual communication status information sent by other power units through the first communication circuit.

3. The method according to claim 1 or 2, characterized in that, After receiving the dual communication status information, the method further includes: The dual communication status information is sent to other power units among the plurality of power units through the first communication circuit.

4. The method according to claim 1, characterized in that, After the power unit is locked, the method further includes: A lock-up signal is sent to the control unit so that the control unit triggers other power units to lock up based on the lock-up signal.

5. The method according to any one of claims 1-2, characterized in that, The method further includes: The control unit receives a lock-up signal sent through the second communication circuit, which triggers the power unit to lock up.

6. A communication lockout protection method for a high-voltage series system, characterized in that, The method is applied to a high-voltage series system, the system comprising: a control unit and multiple power units, wherein any two power units communicate bidirectionally via a first communication circuit, and each power unit and the control unit communicate bidirectionally via a second communication circuit; the method is executed by the control unit, and the method includes: The communication status information of each power unit when communicating with other power units in the plurality of power units through the first communication circuit is obtained, and the first communication status information is obtained based on the communication status information; the first communication status information is used to indicate whether the first communication circuit of each power unit in the plurality of power units has malfunctioned. The communication status information of each of the plurality of power units when communicating with the control unit through the second communication circuit is obtained, and the second communication status information is obtained based on the communication status information; the second communication status information is used to indicate whether the second communication circuit of each of the plurality of power units is abnormal. Based on the first communication status information and the second communication status information, dual communication status information is obtained. The dual communication status information is used to indicate whether there are any power units among the plurality of power units where both the first communication circuit and the second communication circuit of the power unit are abnormal. The dual communication status information is sent to each of the multiple power units so that the power units that have not experienced communication abnormalities are locked.

7. The method according to claim 6, characterized in that, The method further includes: The system receives a lock-up signal from at least one of the plurality of power units, the lock-up signal indicating that at least one of the plurality of power units has locked up.

8. The method according to claim 7, characterized in that, After receiving a lock-up signal from at least one of the plurality of power units, the method further includes: A lock-up signal is sent to the power units among the plurality of power units that have not triggered lock-up, and the lock-up signal is used to trigger the power units among the plurality of power units that have not triggered lock-up to lock up.

9. A high-voltage series system, characterized in that, The system includes: a control unit and multiple power units; any two power units among the multiple power units communicate bidirectionally through a first communication circuit, and each power unit among the multiple power units communicates bidirectionally with the control unit through a second communication circuit; Each of the plurality of power units is configured to acquire communication status information when the power unit communicates with other power units in the plurality of power units through a first communication circuit, and send the communication status information to the control unit. The control unit is configured to obtain first communication status information based on the communication status information; the first communication status information is used to indicate whether the first communication circuit of each of the plurality of power units has malfunctioned. The control unit is further configured to acquire communication status information of each of the plurality of power units when communicating with the control unit through the second communication circuit, and to obtain second communication status information of the plurality of power units based on the communication status information; the second communication status information is used to indicate whether the second communication circuit of each of the plurality of power units has malfunctioned. The control unit is further configured to determine whether there is a communication abnormality in the first communication circuit and the second communication circuit of each of the plurality of power units based on the first communication status information and the second communication status information; when at least one of the plurality of power units has a communication abnormality in both the first communication circuit and the second communication circuit, the control unit controls the power units that have not experienced a communication abnormality to lock up based on the communication information sent by the control unit.

10. The system according to claim 9, characterized in that, The first communication circuit is any one of serial communication circuit, optical fiber communication circuit, controller area network communication circuit, and Ethernet communication circuit. The second communication circuit is any one of serial communication circuit, optical fiber communication circuit, controller area network communication circuit, and Ethernet communication circuit.

11. The system according to claim 9 or 10, characterized in that, After at least one of the power units triggers a lock-up, it sends a lock-up signal to the control unit.

12. The system according to claim 11, characterized in that, The control unit is also used for: The second communication circuit sends a lock-up signal to each of the plurality of power units, so that the power unit that receives the lock-up signal triggers lock-up.

13. The system according to any one of claims 9-10, characterized in that, The control unit is also used for: Dual communication status information is obtained based on the first communication status information and the second communication status information. The dual communication status information is used to indicate whether a communication abnormality has occurred in the high-voltage series system.

14. The system according to claim 13, characterized in that, At least one of the power units is further used for: The receiving control unit sends dual communication status information via the second communication circuit, and triggers the power unit to lock up based on the dual communication status information; or... Receive dual communication status information sent by other power units through the first communication circuit, and trigger the power unit to lock up based on the dual communication status information; or... The receiving control unit sends a lock-up signal through the second communication circuit, and triggers the power unit to lock up based on the lock-up signal.

15. The system according to claim 14, characterized in that, After receiving dual communication status information sent by the control unit through the second communication circuit, at least one of the power units further serves to: The dual communication status information is sent to other power units through the first communication circuit.

16. A power electronic transformer, characterized in that, The transformer includes a high-voltage series system as described in any one of claims 9-15.

17. A computer-readable medium storing instructions that, when executed on a computer, cause the computer to perform the method as claimed in any one of claims 1-5 or 6-8.

18. A computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method as claimed in any one of claims 1-5 or 6-8.

19. A chip comprising a memory and a processor, the memory for storing computer instructions, and the processor for calling and executing the computer instructions from the memory to perform the method as claimed in any one of claims 1-5 or 6-8.

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