Master-slave adaptive energy storage device and control method

Abstract

The application discloses a master-slave adaptive energy storage device and a control method, and belongs to the technical field of energy storage converter control. The device comprises a modular energy storage converter and a battery management system. The modular energy storage converter comprises sub-modules, the sub-modules comprise sub-modules characterized as masters and sub-modules characterized as slaves, and the battery management system is in communication connection with the sub-modules characterized as masters. The sub-modules characterized as masters set a first state flag bit according to a communication link state. The sub-modules characterized as slaves set a second state flag bit. The method is started from the actual application angle of the modular energy storage converter, combined with the communication networking characteristics, and provides a method for adaptively judging the master-slave according to the communication link state, greatly reduces the field workload, realizes adaptive configuration of the master-slave of each sub-module of the modular energy storage converter, does not need manual intervention, greatly improves the field debugging and operation and maintenance efficiency, and is convenient for engineering application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage converter control, and particularly relates to a master-slave adaptive energy storage device and a control method. BACKGROUND

[0002] The power level of a large-scale energy storage system can reach hundreds of megawatts or above. Due to the influence of factors such as energy storage converter power devices, the single-machine capacity of the current energy storage converter can only reach several megawatts at most. A modular energy storage converter is generally realized by parallel connection of multiple converter sub-modules, can realize single-cluster management, and improve the battery cluster level balance. By increasing the number of parallel converter sub-modules, the single-machine capacity of a single modular energy storage converter can be improved, thereby reducing the number of parallel modular energy storage converters in a large-scale energy storage system and reducing the complexity of the control system.

[0003] The master-slave control can be used to realize the coordinated control between the sub-modules of the modular energy storage converter. Some master-slave control related technologies are currently available, such as patents CN203398797U and CN205104918U, which both disclose a master-slave control system for energy storage converters. However, the existing researches all need to manually set or select one as the master, and the others as slaves, so the master-slave setting needs manual participation. For a large-scale energy storage system, there are hundreds or thousands of energy storage converters, and each energy storage converter can also have multiple converter sub-modules. If the master-slave is set manually, the on-site debugging workload will be greatly increased, and the operation and maintenance efficiency will be greatly reduced. SUMMARY

[0004] The purpose of the present application is to provide a master-slave adaptive energy storage device for coordinated control of the sub-modules of a modular energy storage converter, to realize master-slave adaptive configuration of the sub-modules of the modular energy storage converter. Another purpose of the present application is to provide a control method for the master-slave adaptive energy storage device.

[0005] The present application provides a master-slave adaptive energy storage device, comprising:

[0006] The modular energy storage converter comprises sub-modules, the sub-modules include sub-modules representing masters and sub-modules representing slaves, and the sub-modules representing masters and the sub-modules representing slaves are communicatively connected;

[0007] A battery management system is communicatively connected to the sub-modules representing masters;

[0008] The sub-modules representing masters set a first state flag according to the communication link state;

[0009] The sub-modules representing slaves set a second state flag.

[0010] In some embodiments, the battery management system is communicatively connected with any one of the sub-modules of the modular energy storage converter, and the sub-module connected with the battery management system is used as a master sub-module, and other sub-modules are used as slave sub-modules.

[0011] In some embodiments, further comprising:

[0012] An upper control unit, connected with the master sub-module, for delivering control instructions to the modular energy storage converter.

[0013] In some embodiments, the upper control unit comprises a coordinated control system or an energy management system.

[0014] In some embodiments, the control instructions comprise power instructions or start-stop commands.

[0015] In some embodiments, the sub-modules are configured with at least three groups of communication interfaces for communication connection.

[0016] In some embodiments, the communication interfaces are physical interfaces or functional module interfaces.

[0017] In some embodiments, the communication interfaces comprise a first communication interface, a second communication interface, and a third communication interface; and the communication modes of the first communication interface, the second communication interface, and the third communication interface are selected from any one of Modbus TCP, Modbus RTU, GOOSE, or CAN.

[0018] In some embodiments, the sub-modules are connected through the first communication interface via an interconnection network; the battery management system is connected with the sub-modules through the second communication interface via a first communication network; and the upper control unit is connected with the sub-modules through the third communication interface via a second communication network.

[0019] In some embodiments, the interconnection network and the second communication network are independent communication networks or share a unified network.

[0020] In some embodiments, the modular energy storage converter comprises N sub-modules, where N is the number of sub-modules, N≥2, and N is an integer; and the battery management system is communicatively connected with the Kth sub-module in the modular energy storage converter, where 1≤K≤N, and K is an integer.

[0021] In some embodiments, the communication link status comprises a first communication link status within the modular energy storage converter and a second communication link status between the master sub-module and the battery management system.

[0022] In some embodiments, a control method of a master-slave adaptive energy storage device includes the following steps:

[0023] A modular energy storage converter is provided, which includes sub-modules, the sub-modules include sub-modules characterized as masters and sub-modules characterized as slaves, the sub-modules characterized as masters and the sub-modules characterized as slaves are communicatively connected;

[0024] The sub-modules receive a first signal from the modular energy storage converter, and determine a first communication link state in the modular energy storage converter;

[0025] The sub-modules characterized as masters receive a second signal from a battery management system, and determine a second communication link state with the battery management system;

[0026] The sub-modules characterized as masters set a first state flag bit according to the first communication link state and the second communication link state, respectively;

[0027] When the sub-modules characterized as masters set the first state flag bit, the sub-modules characterized as slaves set a second state flag bit.

[0028] In some embodiments, after the sub-modules characterized as slaves set the second state flag bit, further comprising:

[0029] The sub-modules characterized as masters receive a third signal from an upper control unit, determine a third communication link state with the upper control unit, and receive control instructions of the upper control unit according to the third communication link state.

[0030] In some embodiments, the determination of the first communication link state includes:

[0031] When the first communication link state is normal, the sub-modules characterized as masters set a first communication flag bit.

[0032] In some embodiments, the determination of the second communication link state includes:

[0033] When the second communication link state is normal, the sub-modules characterized as masters set a second communication flag bit.

[0034] In some embodiments, the first communication link state and the second communication link state specifically refer to that the first communication flag bit and the second communication flag bit in the sub-modules characterized as masters are both set.

[0035] In some embodiments, the first state flag bit is a master flag, and the second state flag bit is a slave flag.

[0036] In some embodiments, the judging of the third communication link state comprises:

[0037] When the third communication link state is normal, the sub-module representing the master sets a third communication flag bit.

[0038] In some embodiments, the third communication flag bit is the communication link state between the sub-module representing the master and the upper control unit.

[0039] In some embodiments, the first communication interface link state, the second communication link state and the third communication link state specifically refer to the link state of the communication interface configured on the sub-module.

[0040] In some embodiments, the setting of the first communication flag bit indicates that the communication between the sub-modules in the modular energy storage converter is normal, and the setting of the second communication flag bit indicates that the communication between the sub-module and the battery management system (BMS) is normal.

[0041] In some embodiments, the setting of the third communication flag bit indicates that the communication between the sub-module and the coordinated control system (PMS) or the energy management system (EMS) is normal.

[0042] Beneficial effects: Compared with the prior art, the master-slave adaptive energy storage device of the present application comprises: a modular energy storage converter, the modular energy storage converter comprising a sub-module, the sub-module comprising a sub-module representing a master and a sub-module representing a slave, and the sub-module representing a master and the sub-module representing a slave are in communication connection; a battery management system in communication connection with the sub-module representing a master; the sub-module representing a master sets a first state flag bit according to the communication link state; after the sub-module representing a master sets the first state flag bit, the sub-module representing a slave sets a second state flag bit. The present application judges the communication link state of different communication interfaces of the converter sub-module, adaptively determines the master and the slave, and then realizes the master-slave adaptive configuration between the sub-modules.

[0043] The control method of the master-slave adaptive energy storage device provided in the application comprises the following steps: providing a modular energy storage converter, the modular energy storage converter comprising sub-modules, the sub-modules comprising sub-modules characterized as masters and sub-modules characterized as slaves, and the sub-modules characterized as masters and the sub-modules characterized as slaves being communicatively connected; the sub-modules receiving a first signal from the modular energy storage converter, judging a first communication link state in the modular energy storage converter; the sub-modules characterized as masters receiving a second signal from a battery management system, judging a second communication link state between the sub-modules characterized as masters and the battery management system; the sub-modules characterized as masters setting a first state flag bit according to the first communication link state and the second communication link state; when the sub-modules characterized as masters set the first state flag bit, the sub-modules characterized as slaves set a second state flag bit. The application provides a method for adaptively judging masters and slaves according to communication link states from the perspective of practical application of the modular energy storage converter, in combination with the communication networking characteristics, greatly reduces the field workload, does not require manual intervention, greatly improves the field debugging and operation efficiency, and is convenient for engineering application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The technical solutions and other beneficial effects of the application will become apparent from the following detailed description of specific embodiments of the application, taken in conjunction with the accompanying drawings.

[0045] Figure 1 The control method flow chart of the master-slave adaptive energy storage device disclosed in the embodiments of the application;

[0046] Figure 2 The communication structure diagram of the modular energy storage converter disclosed in the embodiments of the application;

[0047] Figure 3 The communication structure diagram of another modular energy storage converter disclosed in the embodiments of the application;

[0048] Figure 4 The communication interface configuration diagram of the modular energy storage converter shown in the embodiments of the application;

[0049] The drawings show that: 100-modular energy storage converter, 101-battery management system, 102-upper control unit, 104-first communication network, 105-interconnection network, 106-second communication network, 1001-first sub-module, 100K-Kth sub-module, 100N-Nth sub-module, 107-first communication interface, 108-second communication interface, 109-third communication interface. DETAILED DESCRIPTION

[0050] With reference to the drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0051] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0052] A master-slave adaptive energy storage device comprises a modular energy storage converter 100, a battery management system 101, and an upper control unit 102. The modular energy storage converter 100 comprises N sub-modules, specifically a first sub-module 1001, a Kth sub-module 100K, an Nth sub-module 100N, and the like, where N≥2 and N is an integer.

[0053] In some embodiments, referring to Figure 4 Each sub-module is configured with three communication interfaces, including a first communication interface 107, a second communication interface 108, and a third communication interface 109.

[0054] In some embodiments, the modular energy storage converter 100 specifically refers to an energy storage converter PCS, the battery management system 101 specifically refers to a battery management system BMS, and the upper control unit 102 specifically refers to a coordinated control system PMS or an energy management system EMS.

[0055] As shown in Figure 2 A modular energy storage converter communication structure disclosed by the master-slave adaptive device, the interconnection network 105 and the second communication network 106 are independent communication networks.

[0056] In some embodiments, the first sub-module 1001 to the Nth sub-module 100N are connected to the respective first communication interfaces 107 through a communication medium, including but not limited to a network cable, an optical fiber, and the like, to form the interconnection network 105. The communication protocol includes but is not limited to Modbus TCP, Modbus RTU, GOOSE, or CAN.

[0057] In some embodiments, the battery management system 101 accesses the second communication interface 108 of the Kth submodule 100K through a communication medium, including but not limited to a network cable, an optical fiber, etc., to form a first communication network 104, and the communication protocol includes but is not limited to Modbus TCP, Modbus RTU, GOOSE or CAN.

[0058] In some embodiments, the upper control unit 102 accesses the third communication interface 109 of the Kth submodule 100K through a communication medium, including but not limited to a network cable, an optical fiber, etc., to form a second communication network 106, and the communication protocol includes but is not limited to Modbus TCP, Modbus RTU, GOOSE or CAN, where 1≤K≤N, and K is an integer.

[0059] In some embodiments, under the above communication configuration, the submodule receives a first signal from the modular energy storage converter 100, judges the communication link state of the first communication interface 107, and if the communication link is normal, the submodule determines that the first communication flag bit is set. The first communication flag bit is used to represent whether the communication between the submodules is normal. For the modular energy storage converter 100, it is necessary to ensure that the communication between the submodules is normal before operation.

[0060] In some embodiments, the described "set" represents an active state.

[0061] In some embodiments, the Kth submodule 100K receives a second signal from the battery management system 101, judges the communication link state of the second communication interface 108, and if the communication link is normal, the Kth submodule 100K determines that the second communication flag bit is set. The second communication flag bit is used to represent whether the communication between the Kth submodule 100K and the battery management system 101 is normal. The premise of the operation of the modular energy storage converter 100 is to ensure that the communication with the battery management system 101 is normal. Therefore, before the operation of the modular energy storage converter 100, the Kth submodule 100K and the battery management system 101 need to communicate normally.

[0062] In some embodiments, through the above submodule communication state self-judgment, the first communication flag bit and the second communication flag bit of the Kth submodule 100K are set, and the Kth submodule 100K sets the first state flag bit, which represents that the Kth submodule 100K is the host. The other submodules with the set first communication flag bit set the second state flag bit, which represents that the other submodules are slaves.

[0063] In some embodiments, the Kth submodule 100K is the submodule representing the host, and the other submodules are the submodules representing the slaves.

[0064] In some embodiments, the Kth submodule 100K receives a third signal from the upper layer control unit 102, and judges the communication link state of the third communication interface 109. If the communication link is normal, the Kth submodule 100K sets the third communication flag bit. The third communication flag bit is used to represent whether the communication between the Kth submodule 100K and the upper layer control unit 102 is normal. The modular energy storage converter 100 generally needs to accept the control instruction of the upper layer control unit during operation. Therefore, the communication between the Kth submodule 100K and the upper layer control unit 102 is normal before the modular energy storage converter 100 operates. On this basis, the Kth submodule 100K accepts the upper layer control instruction, disassembles and distributes it, and sends it to other submodules through the interconnection network 105. Other submodules also send their own state information to the Kth submodule 100K through the interconnection network 105, so as to realize the orderly control of one master and multiple slaves. The control instruction includes power instruction control and start-stop module control.

[0065] In some embodiments, the submodules of the modular energy storage converter 100 are connected through the interconnection network through the first communication interface 107. The submodules are also configured with the second communication interface 108 and the third communication interface 109. Figure 1 The control method flow chart of the master-slave adaptive energy storage device specifically includes the following steps.

[0066] Step 201: The submodule judges the link state of the first communication interface 107 in real time. If the link state of the first communication interface 107 is normal, the submodule sets the first communication flag bit.

[0067] Step 202: The submodule judges the link state of the second communication interface 108 in real time. If the link state of the second communication interface 108 is normal, the submodule sets the second communication flag bit.

[0068] Step 203: If the first communication flag bit and the second communication flag bit in the submodule are both set, the submodule sets the first state flag bit.

[0069] Step 204: When there is a submodule with the set first state flag bit, other submodules with the set first communication flag bit set the second state flag bit.

[0070] Step 205: The submodule with the first state flag bit judges the link state of the third communication interface 109 in real time. When the link state of the third communication interface 109 is normal, the submodule sets the third communication flag bit, and then receives the upper layer control instruction.

[0071] In some embodiments, the submodule in steps 202 to 205 is the Kth submodule 100K in combination with the accompanying drawings Figure 2 and 3

[0072] ​In some embodiments, the submodules are interconnected through the first communication interface 107 and exchange information on control commands and submodule status.

[0073] In some embodiments, the second communication interface 108 is the communication interface between the Kth submodule 100K and the battery management system 101.

[0074] In some embodiments, the third communication interface 109 is the communication interface between the Kth submodule 100K and the coordination control system PMS or the energy management system EMS.

[0075] In some embodiments, the first status flag is a host flag and the second status flag is a slave flag.

[0076] In some embodiments, the third communication flag indicates the communication link status between the Kth submodule 100K and the coordination control system PMS or the energy management system EMS. The setting of the third communication flag indicates that the Kth submodule 100K is communicating normally with the PMS or EMS.

[0077] In some embodiments, control commands include power commands and start / stop commands.

[0078] like Figure 3 As shown, another modular energy storage converter communication structure disclosed in the master-slave adaptive device is used, in which the communication network 106 and the interconnection network 105 share a unified network.

[0079] In some embodiments, the Kth submodule 100K only needs one physical interface to access the communication network 106 and the Internet 105, and the communication information of the communication network 106 and the Internet 105 can be distinguished through the software function module interface inside the Kth submodule 100K.

[0080] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0081] The foregoing has provided a detailed description of a master-slave adaptive energy storage device and control method provided in the embodiments of this application. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A master-slave adaptive energy storage device, characterized in that, include: A modular energy storage converter (100) includes sub-modules, each sub-module being characterized as a master and a slave, and the master sub-module and the slave sub-module are communicatively connected. The battery management system (101) is communicatively connected to the submodule characterized as the host. The submodule characterized as the host sets a first status flag bit according to the communication link status; the communication link status includes: the first communication link status within the modular energy storage converter (100) and the second communication link status between the submodule characterized as the host and the battery management system (101); the first communication link status and the second communication link status specifically refer to: both the first communication flag bit and the second communication flag bit in the submodule characterized as the host being set; the first status flag bit is the host flag; The representation is that the slave submodule sets the second status flag bit, and the second status flag bit is the slave flag.

2. The master-slave adaptive energy storage device according to claim 1, characterized in that, Also includes: The upper control unit (102), connected to the sub-module characterized as the host, is used to transmit control commands to the modular energy storage converter (100).

3. The master-slave adaptive energy storage device according to claim 2, characterized in that, The upper control unit (102) includes a coordination control system or an energy management system.

4. A master-slave adaptive energy storage device according to claim 2, characterized in that, The control commands include power commands or start / stop commands.

5. A master-slave adaptive energy storage device according to claim 2, characterized in that, The submodule is configured with at least three sets of communication interfaces for communication connection.

6. A master-slave adaptive energy storage device according to claim 5, characterized in that, The communication interface is either a physical interface or a functional module interface.

7. A master-slave adaptive energy storage device according to claim 5, characterized in that, The communication interface includes a first communication interface (107), a second communication interface (108), and a third communication interface (109); the communication methods of the first communication interface (107), the second communication interface (108), and the third communication interface (109) are selected from any one of Modbus TCP, Modbus RTU, GOOSE, or CAN.

8. A master-slave adaptive energy storage device according to claim 7, characterized in that, The sub-modules are connected to each other via the first communication interface (107) and the Internet (105); the battery management system (101) is connected to the sub-modules via the second communication interface (108) and the first communication network (104); the upper-level control unit (102) is connected to the sub-modules via the third communication interface (109) and the second communication network (106).

9. A master-slave adaptive energy storage device according to claim 8, characterized in that, The interconnection network (105) and the second communication network (106) are either independent communication networks or share a unified network.

10. A master-slave adaptive energy storage device according to claim 1, characterized in that, The modular energy storage converter (100) includes N sub-modules, where N is the number of sub-modules, N≥2, and N is an integer; the battery management system (101) is communicatively connected to the Kth sub-module in the modular energy storage converter (100), where 1≤K≤N, and K is an integer.

11. A control method for a master-slave adaptive energy storage device according to any one of claims 1-10, characterized in that, Includes the following steps: A modular energy storage converter (100) is provided, the modular energy storage converter (100) includes sub-modules, the sub-modules include a sub-module characterized as a master and a sub-module characterized as a slave, and the sub-module characterized as a master and the sub-module characterized as a slave are communicatively connected. The submodule receives a first signal from the modular energy storage converter (100) and determines the status of the first communication link within the modular energy storage converter (100); The submodule characterized as the host receives a second signal from the battery management system (101) and determines the status of the second communication link with the battery management system (101); The first communication link state and the second communication link state specifically refer to the following: both the first communication flag bit and the second communication flag bit in the submodule characterized as the host are set. The submodule characterized as the host sets a first status flag bit according to the first communication link status and the second communication link status, respectively. The first status flag bit is the host flag. When the submodule characterized as a master sets the first status flag, the submodule characterized as a slave sets the second status flag, which is a slave flag.

12. The control method for a master-slave adaptive energy storage device according to claim 11, characterized in that, After the submodule characterized as a slave sets the second status flag, the following is also included: The submodule characterized as the host receives a third signal from the upper control unit (102), determines the status of the third communication link with the upper control unit (102), and receives the control command from the upper control unit (102) according to the status of the third communication link.

13. The control method for a master-slave adaptive energy storage device according to claim 11, characterized in that, The determination of the status of the first communication link includes: When the first communication link is in normal condition, the submodule representing the host sets the first communication flag bit.

14. The control method for a master-slave adaptive energy storage device according to claim 11, characterized in that, The determination of the second communication link status includes: When the second communication link is in normal condition, the submodule representing the host sets the second communication flag bit.

15. The control method for a master-slave adaptive energy storage device according to claim 12, characterized in that, The determination of the status of the third communication link includes: When the third communication link is in normal condition, the submodule representing the host sets the third communication flag.

16. The control method for a master-slave adaptive energy storage device according to claim 15, characterized in that: The third communication flag indicates the communication link status between the submodule representing the host and the upper-level control unit (102).

17. The control method for a master-slave adaptive energy storage device according to claim 12, characterized in that: The first communication interface link status, the second communication link status, and the third communication link status specifically refer to the link status of the communication interface configured on the submodule.

Images