Dual-CAN redundant linkage control system and energy storage system
By using a dual-CAN redundant linkage control system, two independent CAN interfaces and buses are used to form a primary and backup communication network, which solves the problem that the communication between the static transfer switch and the energy storage converter is susceptible to single-point failure, and realizes the reliability of data interaction and system stability under fault conditions.
Patent Information
- Application Number
- CN202522479833.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-11-24
AI Technical Summary
In existing technologies, communication between static transfer switches and multiple energy storage converters is susceptible to single-point failures, which may result in the inability to execute commands synchronously in emergency situations, threatening grid stability.
The system adopts a dual-CAN redundant linkage control system, which forms a primary and backup communication network through two independent CAN interfaces and buses to ensure that data interaction can still be maintained when the communication link fails. Both the static transfer switch and the energy storage converter are equipped with two CAN communication interfaces, which are connected through two CAN buses respectively, and each device monitors and switches the communication path on its own.
This effectively eliminates single-point communication failures between the static transfer switch and multiple energy storage converters, improves communication reliability, and ensures the safety and stability of the system in the event of a failure.
Smart Images
Figure CN223809611U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of power electronics, especially to a dual-CAN redundant linkage control system and energy storage system. BACKGROUND
[0002] In a large energy storage system, in order to meet the power demand, usually multiple energy storage converters (PCS) are connected in parallel, and a static transfer switch (STS) is equipped to realize the fast switching between the power grid and the energy storage system. The STS needs to communicate with each PCS in real time and reliably to synchronize the state, issue instructions (such as start / stop, power regulation, etc.), and receive feedback, thereby ensuring the coordinated work and safety of the entire system (such as grid-connected and off-grid switching).
[0003] Currently, the common connection method is to connect the STS and all PCSs using a single CAN bus. This topology structure has a serious single-point failure risk. Once the CAN bus is interrupted due to electromagnetic interference, cable wear and tear, loose joints, or lightning surge, etc., the STS will not be able to command the PCS group. In an emergency situation requiring grid switching, communication interruption may cause the PCS to fail to execute commands synchronously, thereby causing system oscillation, power failure, and even equipment damage, posing a serious threat to the stability of the power grid. SUMMARY
[0004] The utility model aims to provide a dual-CAN redundant linkage control system and energy storage system to at least solve the technical problem of single-point failure in communication between the existing static transfer switch and multiple energy storage converters.
[0005] The utility model provides a dual-CAN redundant linkage control system, comprising: a static transfer switch and multiple energy storage converters; the static transfer switch and each energy storage converter have two independent CAN0 communication interfaces and CAN1 communication interfaces; the CAN0 communication interface of the static transfer switch is connected with the CAN0 communication interfaces of all energy storage converters through a first CAN bus, forming a main communication network; the CAN1 communication interface of the static transfer switch is connected with the CAN1 communication interfaces of all energy storage converters through a second CAN bus, forming a backup communication network; the main controller of the static transfer switch and the local controller of each energy storage converter run the same communication link monitoring and switching logic.
[0006] Preferably, the main controller of the static transfer switch is a TMS320F2837, and the local controller of each energy storage converter is a TMS320F2837.
[0007] Preferably, both ends of the first CAN bus and both ends of the second CAN bus are provided with terminal resistors.
[0008] Preferably, the number of terminal resistors is four, which are a first resistor, a second resistor, a third resistor and a fourth resistor; one end of the first CAN bus is provided with the first resistor, and the other end of the first CAN bus is provided with the second resistor; one end of the second CAN bus is provided with the third resistor, and the other end of the second CAN bus is provided with the fourth resistor.
[0009] Preferably, the resistance of each terminal resistor is 120Ω.
[0010] Preferably, the number of energy storage converters is 10.
[0011] The utility model also provides a kind of energy storage system, comprising: the double CAN redundancy linkage control system as described above.
[0012] The double CAN redundancy linkage control system and the energy storage system provided by the embodiment form a redundant communication network with a main communication network and a backup communication network through two physically independent CAN interfaces and buses, which can ensure that the static transfer switch and the multiple energy storage converters can still communicate and interact when communication link fails, effectively eliminate the "single point failure" of communication between the static transfer switch and the multiple energy storage converters, and significantly improve the communication reliability. BRIEF DESCRIPTION OF DRAWINGS
[0013] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.
[0014] Figure 1 It is a topological structure schematic diagram of the double CAN redundancy linkage control system of the utility model embodiment.
[0015] Figure 2 It is a system working process schematic diagram when the CAN0 communication interface of PCS1 fails.
[0016] Figure 3 It is a system working process schematic diagram when the CAN0 bus of PCS1 is disconnected.
[0017] Figure 4 It is a system working process schematic diagram when the CAN0 bus of PCS2 is disconnected.
[0018] Figure 5A system working process schematic diagram when the CAN0 bus at the PCS2 and the PCS10 is disconnected.
[0019] Figure 6 A system working process schematic diagram when the CAN0 bus at the PCS1, the PCS2 and the PCS10 is disconnected. DETAILED DESCRIPTION
[0020] In order to make the above objectives, characteristics and advantages of the utility model more apparent and easily understood, the specific embodiments of the utility model are described in detail below with reference to the drawings. It should be understood that a lot of specific details are set forth in the following description in order to fully understand the utility model, but the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, therefore the utility model is not limited by the specific embodiments disclosed below.
[0021] As shown in Figure 1 The embodiment provides a dual-CAN redundant linkage control system, which comprises a static transfer switch STS and a plurality of energy storage converters.
[0022] For example, the number of energy storage converters is 10, and the energy storage converters are denoted as PCS1, PCS2, …, PCS10.
[0023] The static transfer switch comprises a main controller and two independent CAN communication interfaces (denoted as a CAN0 communication interface of the static transfer switch and a CAN1 communication interface of the static transfer switch).
[0024] Each energy storage converter comprises a local controller and two independent CAN communication interfaces (denoted as a CAN0 communication interface of each energy storage converter and a CAN1 communication interface of each energy storage converter).
[0025] The CAN0 communication interface of the static transfer switch is connected with the CAN0 communication interfaces of all the energy storage converters through a first CAN bus (denoted as a CAN0 bus), and a main communication network is formed; and the CAN1 communication interface of the static transfer switch is connected with the CAN1 communication interfaces of all the energy storage converters through a second CAN bus (denoted as a CAN1 bus), and a backup communication network is formed.
[0026] Preferably, the main controller of the static transfer switch is a TMS320F2837, and the local controller of each energy storage converter is a TMS320F2837.
[0027] The dual-CAN redundant linkage control system further comprises four terminal resistors, which are denoted as a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4.
[0028] The first CAN bus and the second CAN bus are each provided with a terminal resistor. Specifically, one end of the first CAN bus is provided with a first resistor R1, and the other end of the first CAN bus is provided with a second resistor R2; one end of the second CAN bus is provided with a third resistor R3, and the other end of the second CAN bus is provided with a fourth resistor R4.
[0029] Preferably, the first resistor R1 and the third resistor R3 are integrated on the static transfer switch, and the second resistor R2 and the fourth resistor R4 are integrated on the PCS 10. For example, the terminal resistors are welded on the static transfer switch and the PCS 10 by using an electric soldering iron.
[0030] Here, the terminal resistors are used for matching impedance, thereby preventing signal reflection in CAN bus communication and ensuring stability and reliability of communication.
[0031] As an example, each terminal resistor has a resistance of 120Ω.
[0032] In the embodiment, the main controller of the static transfer switch and the local controller of each energy storage converter run the same communication link monitoring and switching logic.
[0033] The working process of the double-CAN redundant linkage control system of the embodiment is as follows: after the system is started, the CAN0 and CAN1 of the static transfer switch and the CAN0 and CAN1 of all the energy storage converters are initialized, and the current sending channel uses the CAN0 bus channel by default, that is, the current sending channel is the main communication network, and the CAN1 bus channel is the standby communication network. The static transfer switch and each energy storage converter independently monitor the communication states of the CAN0 and the CAN1 (that is, the static transfer switch monitors the communication states of the CAN0 and the CAN1 of the STS, the PCS1 monitors the communication states of the CAN0 and the CAN1 of the PCS1, …, the PCS10 monitors the communication states of the CAN0 and the CAN1 of the PCS10), when a CAN0 fault is monitored, the device (referred to as the device) that has the CAN0 fault switches from the CAN0 bus channel to the CAN1 bus channel (that is, switches from the main communication network to the standby communication network), and all new sending instructions of the device are automatically sent through the CAN1; the devices that do not have the CAN0 fault do not need to switch and still use the main communication network. When the device monitors that the CAN0 is restored to normal, the device switches from the CAN1 bus channel to the CAN0 bus channel (that is, switches from the standby communication network back to the main communication network), which can ensure the priority of the main communication network and keep the standby communication network in a good hot backup state at any time.
[0034] When multiple devices have CAN0 faults, each device with a CAN0 fault switches from the main communication network to the backup communication network; when the fault is recovered, the device with the recovered CAN0 fault switches back from the backup communication network to the main communication network. The device without a CAN0 fault does not need to switch and still uses the main communication network. The device with the fault that is not recovered continues to use the backup communication network until the fault is recovered and then switches back to the main communication network.
[0035] The working process of the dual-CAN redundancy linkage control system of the embodiment under different faults will be described in detail below, but the fault types that can be solved by the present application are not limited to this.
[0036] As shown in FIG. 1, when the CAN0 communication interface of PCS1 has a fault, PCS1 switches from the CAN0 bus channel to the CAN1 bus channel, and PCS2 to PCS10 still use the CAN0 bus channel; when the CAN0 communication interface of PCS1 recovers from the fault, PCS1 switches the communication interface of PCS1 from the CAN1 bus channel to the CAN0 bus channel. It can be understood that when the CAN0 communication interface has a fault, the CAN0 bus channel communicates normally, so when the CAN0 communication interface of PCS1 has a fault, PCS2 to PCS10 can still use the CAN0 bus channel normally. Figure 2 As shown in FIG. 2, when the CAN0 bus of PCS1 is disconnected, PCS1 to PCS10 all switch from the CAN0 bus channel to the CAN1 bus channel; when the CAN0 bus of PCS1 is restored, PCS1 to PCS10 all switch the communication interface of each device from the CAN1 bus channel to the CAN0 bus channel.
[0037] Figure 3 As shown in FIG. 3, when the CAN0 bus of PCS2 is disconnected, PCS2 to PCS10 switch from the CAN0 bus channel to the CAN1 bus channel, and PCS1 still uses the CAN0 bus channel; when the CAN0 bus of PCS2 is restored, PCS2 to PCS10 all switch the communication interface of each device from the CAN1 bus channel to the CAN0 bus channel.
[0038] As shown in FIG. 4, when the CAN0 bus of PCS3 is disconnected, PCS3 to PCS10 switch from the CAN0 bus channel to the CAN1 bus channel, and PCS1 and PCS2 still use the CAN0 bus channel; when the CAN0 bus of PCS3 is restored, PCS3 to PCS10 all switch the communication interface of each device from the CAN1 bus channel to the CAN0 bus channel. Figure 4 As shown in FIG. 5, when the CAN0 bus of PCS4 is disconnected, PCS4 to PCS10 switch from the CAN0 bus channel to the CAN1 bus channel, and PCS1 to PCS3 still use the CAN0 bus channel; when the CAN0 bus of PCS4 is restored, PCS4 to PCS10 all switch the communication interface of each device from the CAN1 bus channel to the CAN0 bus channel.
[0039] Figure 5 As shown, when the CAN0 bus at both PCS2 and PCS10 is disconnected (i.e., two disconnection faults occur on the CAN0 bus, denoted as Disconnection A and Disconnection B respectively), PCS2 to PCS10 will switch their respective communication interfaces from the CAN0 bus channel to the CAN1 bus channel, while PCS1 will still use the CAN0 bus channel; when only the CAN0 bus at PCS2 is reconnected (i.e., the CAN0 bus at PCS2 is reconnected but the CAN0 bus at PCS10 is still disconnected), PCS2 to PCS9 will switch their respective communication interfaces from the CAN1 bus channel to the CAN0 bus channel, while PCS10 will still use the CAN1 bus channel; when the CAN0 bus at both PCS2 and PCS10 is reconnected, PCS2 to PCS10 will switch their respective communication interfaces from the CAN1 bus channel to the CAN0 bus channel.
[0040] like Figure 6 As shown, when the CAN0 bus at PCS1, PCS2, and PCS10 is disconnected (i.e., three disconnection faults occur on the CAN0 bus, denoted as Disconnection C, Disconnection D, and Disconnection E respectively), the communication interfaces of PCS1 to PCS10 switch from the CAN0 bus channel to the CAN1 bus channel. When only the CAN0 bus at PCS1 is reconnected (i.e., the CAN0 bus at PCS1 is reconnected but the CAN0 buses at PCS2 and PCS10 are still disconnected), PCS1 will switch its communication interface from the CAN1 bus channel to the CAN0 bus channel, while PCS2 to PCS10 will still use the CAN1 bus channel. When the CAN0 buses at PCS1 and PCS2 are reconnected (i.e., the CAN0 buses at PCS1 and PCS2 are reconnected but the CAN0 bus at PCS10 is still disconnected), PCS1 to PCS9 will switch their respective communication interfaces from the CAN1 bus channel to the CAN0 bus channel. PCS10 still uses the CAN1 bus channel; when the CAN0 bus at PCS1, PCS2 and PCS10 is reconnected, PCS1 to PCS10 will switch their respective communication interfaces from the CAN1 bus channel to the CAN0 bus channel.
[0041] In this embodiment, neither a single bus failure nor a single CAN communication interface failure of a device will cause communication failures between the static transfer switch and multiple energy storage converters, effectively eliminating the "single point of failure" in communication between the static transfer switch and multiple energy storage converters. As an example, when the critical static transfer switch sends off-grid switching commands to multiple energy storage converters, the communication link remains secure and available, greatly improving the overall safety level of the energy storage system.
[0042] It can be understood that, when the CAN0 fails to work normally, no CAN0 "shutdown" operation is needed.
[0043] Preferably, the CAN0 failure includes: sending timeout without response, bus error status bit being set, hardware error flag, etc.
[0044] The embodiment also provides an energy storage system, comprising the dual-CAN redundant linkage control system as described above.
[0045] The dual-CAN redundant linkage control system and the energy storage system provided by the embodiment can ensure that the static transfer switch and the multiple energy storage converters can still communicate and interact with each other when a communication link fails, effectively eliminates the "single point failure" of communication between the static transfer switch and the multiple energy storage converters, and significantly improves the communication reliability.
[0046] The above-described embodiments only express several implementation manners of the utility model, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the patent scope of the utility model. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the appended claims.
Claims
1. A dual CAN redundant linked control system, characterized by, The application relates to a dual-CAN redundant linkage control system. The static conversion switch and the energy storage converters are provided with two independent CAN0 communication interfaces and CAN1 communication interfaces; The CAN0 communication interface of the static conversion switch and the CAN0 communication interfaces of all the energy storage converters are connected through a first CAN bus to form a main communication network; the CAN1 communication interface of the static conversion switch and the CAN1 communication interfaces of all the energy storage converters are connected through a second CAN bus to form a backup communication network; The main controller of the static conversion switch and the local controllers of all the energy storage converters run the same communication link monitoring and switching logic. Both ends of the first CAN bus and both ends of the second CAN bus are provided with terminal resistors.
2. The dual CAN redundant linked control system of claim 1, wherein, The number of the terminal resistors is four, which are a first resistor, a second resistor, a third resistor and a fourth resistor.
3. The dual CAN redundant linked control system of claim 2, wherein, One end of the first CAN bus is provided with the first resistor, and the other end of the first CAN bus is provided with the second resistor; one end of the second CAN bus is provided with the third resistor, and the other end of the second CAN bus is provided with the fourth resistor. The resistance value of each terminal resistor is 120 ohms.
4. The dual CAN redundant linked control system of claim 3, wherein, The main controller of the static conversion switch is a TMS320F2837, and the local controller of each energy storage converter is a TMS320F2837.
5. The dual CAN redundant linked control system of claim 4, wherein, The number of the energy storage converters is 10.
6. The dual CAN redundant linked control system of claim 5, wherein, The application further relates to a dual-CAN redundant linkage control system.
7. An energy storage system characterized by, The dual-CAN redundant linkage control system comprises the static conversion switch and the energy storage converters.