Data interconnection method, energy management system and box transformer substation measurement and control device

Abstract

The invention discloses a data interconnection method, an energy management system and a box transformer substation measurement and control device. According to the method, a data request instruction is sent to a box transformer substation measurement and control device, so that the box transformer substation measurement and control device transmits first total power of a low-voltage side of a box transformer substation to an energy management system; determining a power set value of each energy storage converter according to the first total power, and transmitting the power set value to the corresponding energy storage converter, so that the energy storage converter adjusts the current power according to the power set value; therefore, the total power of the low-voltage side of the box transformer substation is used as a regulation and control reference, the power set values are calculated and distributed in a centralized mode, multi-PCS load balance regulation and control are achieved, the possibility that faults occur in long-term full-load operation of the box transformer substation can be reduced, and the energy conversion efficiency can be improved. When the tripping signal of the box transformer substation measurement and control device is obtained, the emergency shutdown instruction is sent to the energy storage converter so that the energy storage converter can be shut down, and therefore when a fault occurs, a PCS operation loop is rapidly cut off, energy storage equipment is prevented from being further damaged, and the safety of the equipment is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a data interconnection method, an energy management system, and a transformer substation monitoring and control device. Background Technology

[0002] For energy storage systems, the transformer substation is an indispensable key node. It can raise the low-voltage electricity to be connected to the high-voltage grid when the energy storage part discharges, and lower the high-voltage electricity to meet the charging needs of the energy storage device when the grid charges the energy storage system. However, traditional energy storage systems usually adopt an architecture that combines transformer substations with discrete PCS (Power Control System). This not only requires a large number of cabling connections, but also lacks real-time data interaction and collaborative control mechanisms between the transformer substation and multiple PCS at the software level. It also lacks real-time interconnection, which makes the transformer substation prone to long-term overload operation, slow system response speed, and untimely fault isolation. In the event of anomalies, it can easily affect the overall safety of the system. Summary of the Invention

[0003] This application aims to provide a technical solution to the problem of low security caused by the lack of real-time interconnectivity in existing energy storage systems.

[0004] In a first aspect, this application proposes a data interconnection method applied to an energy management system, wherein the energy management system is communicatively connected to a transformer substation monitoring and control device and multiple energy storage converters. The method includes: sending a data request command to the transformer substation monitoring and control device to cause the transformer substation monitoring and control device to transmit a first total power on the low-voltage side of the transformer substation to the energy management system; determining a power setting value for each of the energy storage converters based on the first total power, and transmitting the power setting value to the corresponding energy storage converter to cause the energy storage converter to adjust its current power according to the power setting value; and sending an emergency shutdown command to the energy storage converter when a trip signal is received from the transformer substation monitoring and control device to cause the energy storage converter to shut down.

[0005] In some embodiments, determining a power setting value for each of the energy storage converters based on the first total power, and transmitting the power setting value to the corresponding energy storage converter so that the energy storage converter adjusts its current power according to the power setting value, includes: calculating the product of a safety factor and the rated power of the transformer as a safety power threshold; when the first total power is greater than the safety power threshold, determining the power setting value for each of the energy storage converters based on the safety power threshold so that the sum of the power of the energy storage converters is less than or equal to the safety power threshold.

[0006] In some embodiments, when a trip signal is received from the transformer substation monitoring and control device, an emergency shutdown command is sent to the energy storage converter to shut down the energy storage converter. This includes: obtaining the status data of the transformer substation monitoring and control device through polling; generating an emergency shutdown command when a trip signal is received based on the status data; broadcasting the emergency shutdown command in parallel to all the energy storage converters with the highest priority, so that the energy storage converters shut down in response to the emergency shutdown command and send back confirmation information to the energy management system; and generating an event log based on the confirmation information upon receiving the confirmation information.

[0007] In some embodiments, the method further includes: upon receiving a power failure signal from the transformer substation monitoring and control device, controlling one energy storage converter to start as the master, so that the master outputs a stable microgrid voltage and frequency reference; issuing a tripping command to the transformer substation monitoring and control device, so that the transformer substation monitoring and control device controls the circuit breaker of the transformer substation to trip; controlling the remaining energy storage converters to start as slaves and synchronize with the microgrid voltage and the frequency reference, so as to form a microgrid power supply terminal with the master to supply power to the load.

[0008] In some embodiments, the energy management system further connects to external devices via an industrial firewall, and the method further includes: when connecting to external devices, filtering the communication data of the external devices through the industrial firewall based on the principle of least privilege, wherein the communication data includes at least one of a communication address, a communication port, and a function code.

[0009] In some embodiments, the method further includes: sending a first temperature command to the transformer substation monitoring and control device to obtain the winding temperature of the transformer substation through the transformer substation monitoring and control device; sending a second temperature command to the energy storage converter to obtain the power tube temperature through the energy storage converter; calculating the daily variation rate of the transformer substation winding temperature based on the winding temperature at different times; if the daily variation rate exceeds a preset threshold and continues for a preset time, and if the power tube temperature of at least one energy storage converter rises abnormally synchronously, then generating an early warning message, the early warning message being used to prompt the inspection of common heat dissipation channels or environmental factors.

[0010] Secondly, this application also proposes a data interconnection method applied to a transformer substation monitoring and control device. The transformer substation monitoring and control device is communicatively connected to an energy management system, and the energy management system is also communicatively connected to multiple energy storage converters. The method includes: acquiring total power data of the low-voltage side of the transformer substation in real time; transmitting the total power data to the energy management system in response to a data request command sent by the energy management system, so that the energy management system determines the power setpoint of each energy storage converter based on the total power data; controlling the circuit breaker of the transformer substation to trip when an abnormal state of the transformer substation is detected, and reporting the trip signal to the energy management system, so that the energy management system sends an emergency shutdown command to the energy storage converter based on the trip signal, wherein the abnormal state includes at least one of overvoltage, overcurrent, short circuit, and islanding.

[0011] In some embodiments, the method further includes: when a power grid failure is detected, sending a power failure signal to the energy management system to cause the energy management system to issue a tripping command; and in response to the tripping command of the energy management system, controlling the circuit breaker of the transformer substation to trip so as to physically isolate the power grid from the energy storage converter.

[0012] Unlike related technologies, this application provides a data interconnection method, an energy management system, and a transformer substation monitoring and control device. This method sends a data request command to the transformer substation monitoring and control device, causing the device to transmit the first total power of the low-voltage side of the transformer substation to the energy management system. Based on the first total power, a power setpoint for each energy storage converter is determined and transmitted to the corresponding energy storage converter, allowing the energy storage converter to adjust its current power according to the power setpoint. Thus, using the total power of the low-voltage side of the transformer substation as the control benchmark, the power setpoint is centrally calculated and allocated, achieving load balancing control across multiple power storage systems (PCS). This reduces the possibility of failures due to long-term full-load operation of the transformer substation and improves energy conversion efficiency. Upon receiving a trip signal from the transformer substation monitoring and control device, an emergency shutdown command is sent to the energy storage converter to shut it down. This quickly disconnects the PCS operating circuit in the event of a fault, preventing further damage to the energy storage equipment and improving equipment safety. Attached Figure Description

[0013] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0014] Figure 1 This is a schematic block diagram of the overall energy storage control system according to some embodiments of this application; Figure 2 These are schematic diagrams illustrating application scenarios for some embodiments of this application; Figure 3This is a flowchart illustrating a data interconnection method applied to an energy management system according to some embodiments of this application; Figure 4 This is a flowchart illustrating a data interconnection method applied to a transformer substation monitoring and control device according to some embodiments of this application; Figure 5 This is a schematic diagram of the interaction flow of some embodiments of this application; Figure 6 These are schematic diagrams illustrating the interaction flow of other embodiments of this application; Figure 7 This is a block diagram of an energy management system according to some embodiments of this application; Figure 8 This is a block diagram of a transformer substation monitoring and control device according to some embodiments of this application. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0016] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0017] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0018] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0019] This application provides an energy storage control system, such as... Figure 1As shown, the energy storage control system 100 includes an energy management system 11, a transformer substation monitoring and control device 12, and an energy storage converter 13. The energy management system (EMS) 11 is communicatively connected to both the transformer substation monitoring and control device 13 and the energy storage converter (PCS) 13. The energy management system 11 can communicate with the transformer substation monitoring and control device 12 and the energy storage converter 13 based on the Modbus TCP protocol. The Modbus TCP protocol is an open communication protocol, natively supported by most industrial-grade transformer substation monitoring and control devices, energy storage converters (PCS), network switches, and other equipment. Therefore, no hardware modification or customized development of existing equipment is required, reducing the integration difficulty and cost of the overall system. Moreover, the Modbus TCP protocol has a simple frame structure and high data parsing efficiency. Based on Ethernet transmission, it can not only meet the response time requirements of the energy management system 11 when communicating with other components, but also support the energy management system 11 to achieve point-to-point parallel communication with multiple energy storage converters 13 of the transformer substation monitoring and control device 12 through this protocol. Even if a single device link fails, it will not affect the overall network communication, thus ensuring communication stability and meeting the data interaction requirements of multi-device collaborative control.

[0020] Understandably, the transformer substation monitoring and control device, as part of the transformer substation, can realize core functions including power acquisition, anomaly detection, and circuit breaker control. Moreover, the transformer substation monitoring and control device is the data interaction interface between the transformer substation and the energy management system. To facilitate the explanation of the interaction process, this solution uses the transformer substation monitoring and control device as the main perspective of the transformer substation side to explain the interaction process between the transformer substation side and the energy management system. For example, the transformer substation monitoring and control device can upload the operating data of the transformer substation to the energy management system and receive instructions from the energy management system to control the operation of the transformer substation.

[0021] In some embodiments, please refer to Figure 2 , Figure 2This is a schematic diagram of an application scenario provided in this embodiment. In this scenario, the energy management system 11 is communicatively connected to the transformer substation monitoring and control device 12 and multiple energy storage converters 13 (1#-n#) via a network switch 14. The energy storage converters 13 are connected to the load (in the example of battery systems 1#-n# in the figure) 31. Based on this, multiple energy storage converters 13 are connected one-to-one with multiple battery systems. Each energy storage converter can realize the charging and discharging power conversion of the corresponding battery system, thereby forming an energy storage system cluster. The cluster's centralized management and control enables the coordinated operation of multiple units. In this scenario, the energy management system 11 can also establish a connection with an external network 21 through an industrial firewall 15. The industrial firewall can achieve secure isolation between the external network and the energy management system, filter illegal data, and ensure data interaction security. For example, the external network 21 can be a cloud-based monitoring platform, enabling remote monitoring of the overall system, or it can be an operation and maintenance platform, supporting remote operation and maintenance or receiving alarm information.

[0022] Based on this, embodiments of this application provide a data interconnection method applied to an energy management system, which is communicatively connected to a transformer substation monitoring and control device and multiple energy storage converters. Please refer to... Figure 3 The method includes: S11. Send a data request command to the transformer substation monitoring and control device so that the transformer substation monitoring and control device transmits the first total power of the low-voltage side of the transformer substation to the energy management system.

[0023] Specifically, the energy management system sends a data request command to the transformer substation monitoring and control device. This is a read command, capable of retrieving the first total power data of the low-voltage side of the transformer substation from the device's register (e.g., 0x0100). In this embodiment, the energy management system can obtain the first total power of the low-voltage side of the transformer substation from the monitoring and control device via polling. To this end, after system startup, the energy management system can establish communication connections with the transformer substation monitoring and control device and multiple energy storage converters via a network switch. During this process, the energy management system can synchronously configure the polling period, for example, setting the polling period to be less than or equal to 200 milliseconds. After establishing the connection, the energy management system can also initiate link tests to the transformer substation monitoring and control device and multiple energy storage converters to verify whether data transmission and reception are normal.

[0024] S12. Determine the power setting value of each of the energy storage converters based on the first total power, and transmit the power setting value to the corresponding energy storage converter so that the energy storage converter adjusts its current power according to the power setting value.

[0025] Normally, the rated capacity of a transformer substation is the upper limit of its designed safe operation. Overloading or long-term full-load (100%) operation is very likely to cause overheating of the internal windings or insulation materials, leading to accelerated aging or even short-circuit faults. Therefore, this solution obtains the first total power on the low-voltage side of the transformer substation and determines whether it is necessary to adjust the real-time power of the energy storage converter in combination with the rated capacity of the transformer substation.

[0026] In some embodiments, step S12 specifically includes: calculating the product of the safety factor and the rated power of the transformer as a safety power threshold; when the first total power is greater than the safety power threshold, determining the power setting value of each of the energy storage converters according to the safety power threshold, so that the sum of the power of the energy storage converters is less than or equal to the safety power threshold.

[0027] For example, this scheme reserves 5% capacity as redundancy to mitigate overload risks caused by instantaneous power fluctuations (such as PCS charging / discharging switching, load abrupt changes, etc.). Using 0.95 as a safety factor, assuming the transformer's rated capacity is 1000kW, the calculated safe power threshold is 1000kW × 0.95 = 950kW. Based on this safe power threshold, when the first total power data obtained on the low-voltage side of the transformer exceeds this safe power threshold, the power setting value of each energy storage converter needs to be determined according to the safe power threshold, so that the sum of the power of the energy storage converters is less than or equal to the safe power threshold, thereby controlling the energy storage converters to adjust their current power.

[0028] This embodiment provides an example of how to determine the power setpoint of each energy storage converter based on the total power. Assuming the safe power threshold is 950kW, the energy management system obtains a first total power of 960kW from the low-voltage side of the transformer substation. The system contains four energy storage converters, denoted as PCS1, PCS2, PCS3, and PCS4.

[0029] To address this, the power setting value for each energy storage converter can be determined using an average distribution method. In this method, the initial total power of 960kW is greater than the safe power threshold of 950kW. Based on the safe power threshold of 950kW and the number of energy storage converters (4), the power setting value for each energy storage converter is calculated as 950 / 4 = 237.5kW. This power setting value of 237.5kW is then transmitted to each energy storage converter, allowing it to adjust its current power to this setting value.

[0030] Optionally, power regulation can be applied to each energy storage converter at the same ratio. In this method, if the initial total power of 960kW is greater than the safe power threshold of 950kW, the reduction ratio can be calculated as 950kW / 960kW ≈ 98.96%. Then, each energy storage converter is controlled to multiply its actual power by the reduction ratio to determine its corresponding power setpoint. For example, assuming the actual output powers of PCS1-PCS2 are 260kW, 240kW, 230kW, and 230kW respectively, multiplying them by the reduction ratio of 98.96% yields (approximately equal to) corresponding power setpoints of 257kW, 237.5kW, 227.6kW, and 227.7kW. The corresponding power setpoint is then transmitted to the corresponding energy storage converter, allowing it to adjust its current power to the corresponding power setpoint.

[0031] It should be noted that the above example is merely an illustration of how this solution determines the power setpoint for each energy storage converter, and not a limitation thereof. This solution only limits the power setpoint to be determined based on the first total power. In actual use, other methods different from the above example can be used to determine the power setpoint for each energy storage converter, and this solution does not limit such methods.

[0032] S13. When the trip signal of the transformer substation is obtained, an emergency shutdown command is sent to the energy storage converter to shut down the energy storage converter.

[0033] In this embodiment, during normal operation of the overall system, the transformer substation monitoring and control device monitors the substation's operating status in real time. If an abnormal status is detected, such as overvoltage, overcurrent, short circuit, or islanding, the local protection mechanism will immediately trigger, controlling the circuit breaker to trip and sending a trip signal to the energy management system. In this solution, when the energy management system receives the trip signal, it immediately generates a high-priority emergency shutdown command and sends it to all energy storage converters via parallel broadcast, thereby shutting down the energy storage converters. This emergency shutdown command can be set to the highest interrupt priority on the energy storage converter side, allowing the energy storage converter to unconditionally execute the shutdown sequence upon receiving the command.

[0034] Based on this, in some embodiments, step S13 specifically includes: obtaining the status data of the transformer substation monitoring and control device through polling; generating an emergency shutdown command when a trip signal is obtained based on the status data; broadcasting the emergency shutdown command to all the energy storage converters in parallel with the highest priority, so that the energy storage converters respond to the emergency shutdown command and shut down, and send back confirmation information to the energy management system; and generating an event log based on the confirmation information when the confirmation information is received.

[0035] Specifically, the energy management system (EMS) can perform point-to-point polling of the transformer substation's monitoring and control devices. The polling period can be set to less than or equal to 200 milliseconds. Based on the Modbus TCP protocol, it reads data stored in registers. If a trip signal is detected, a high-priority emergency shutdown command is generated, and a broadcast mechanism is activated to send this command to all energy storage converters via parallel broadcast. Due to its high priority, the energy storage converter immediately executes the shutdown sequence upon receiving the command, disconnecting the charging and discharging circuits. After completing the shutdown, it sends a confirmation message back to the energy management system. Based on this, the direct linkage between the trip signal and the emergency shutdown command, as well as the direct communication between the EMS and the equipment, eliminates redundant intermediate judgment steps. When an abnormal state is detected, the operating circuits of all PCSs are quickly disconnected to prevent the fault from escalating. Furthermore, the command is sent synchronously to all PCSs via parallel broadcast, rather than polling each PC individually, significantly shortening the time from command generation to delivery and ensuring the effectiveness of command execution. In addition, when the energy management system receives confirmation information, it generates an event log based on the confirmation information, records fault information, and triggers alarms to notify maintenance personnel, thereby improving the system's security.

[0036] In some embodiments, the method further includes: S14. Upon receiving a power failure signal from the transformer substation monitoring and control device, control an energy storage converter to start as the main unit, so that the main unit outputs a stable microgrid voltage and frequency reference.

[0037] S15. Issue a tripping command to the transformer substation monitoring and control device so that the transformer substation monitoring and control device controls the circuit breaker of the transformer substation to trip; control the remaining energy storage converters to start as slaves and synchronize them to the microgrid voltage and the frequency reference so as to form a microgrid power supply terminal with the host to supply power to the load.

[0038] Upon receiving a power outage signal, indicating a current grid power failure, the energy management system triggers a black start process. First, it instructs one energy storage converter to start as the master, establishing a microgrid reference with a stable microgrid voltage and frequency. Then, it issues a trip command to control the transformer substation's monitoring and control device to trip the circuit breaker of the transformer substation to isolate the grid, achieving physical isolation between the microgrid and the power-deficient grid and avoiding impact when the grid is restored. Next, it instructs the remaining energy storage converters to operate synchronously with the master as slaves. The master and slaves together form the microgrid power supply end, continuously supplying power to the load, thereby meeting the emergency power supply needs of critical scenarios such as hospitals and data centers.

[0039] Based on this, the Energy Management System (EMS) in this solution can adopt a short-cycle high-speed polling mechanism to directly read core data such as total power and trip signals from the transformer substation's monitoring and control device via the Modbus TCP protocol. This avoids control lag caused by data delays, provides immediate response for PCS power control and grid fault diagnosis, and improves the real-time performance of overall control.

[0040] In some embodiments, the energy management system further connects to external devices via an industrial firewall, and the method further includes: when connecting to external devices, filtering the communication data of the external devices through the industrial firewall based on the principle of least privilege, wherein the communication data includes at least one of a communication address, a communication port, and a function code.

[0041] The industrial firewall filters data based on a pre-defined whitelist of legitimate communication addresses, ports, and function codes, allowing only compliant data from authorized external devices to pass through. Communication requests from unauthorized devices are directly blocked, and operation commands using illegal function codes cannot penetrate the firewall. This solution, by filtering the communication data of these external devices, can prevent external malicious attacks, data theft, or command tampering risks, ensuring the security of the core control link of the energy storage system.

[0042] In some embodiments, the method further includes: sending a first temperature command to the transformer substation monitoring and control device to obtain the winding temperature of the transformer substation through the transformer substation monitoring and control device; sending a second temperature command to the energy storage converter to obtain the power tube temperature through the energy storage converter; calculating the daily variation rate of the transformer substation winding temperature based on the winding temperature at different times; if the daily variation rate exceeds a preset threshold and continues for a preset time, and if the power tube temperature of at least one energy storage converter rises abnormally synchronously, then generating an early warning message, the early warning message being used to prompt the inspection of common heat dissipation channels or environmental factors.

[0043] The first and second temperature commands can be collected daily at set times. Based on this, the Energy Management System (EMS) issues corresponding commands to the transformer substation monitoring and control device and the power transistor circuit (PCS) to collect the transformer substation winding temperature and the PCS power transistor temperature. It calculates the daily rate of change of the transformer substation winding temperature. When the rate of change exceeds the threshold and persists for a period of time, it simultaneously checks whether the power transistor temperature of the PCS also rises abnormally. For example, if the daily rate of change of the transformer substation winding temperature exceeds 10% for three consecutive days, and the IGBT temperature of a certain PCS also rises abnormally during the same period, an early warning message is generated. Based on this early warning message, it prompts the inspection of common heat dissipation channels or environmental factors. Thus, the early warning message directly points to common heat dissipation and environmental factors, prompting staff not to check the hardware faults of individual devices one by one, which can significantly shorten the troubleshooting time, reduce operation and maintenance costs, and avoid unnecessary equipment downtime for maintenance.

[0044] Based on this, this application also proposes a data interconnection method applied to a transformer substation monitoring and control device, wherein the transformer substation monitoring and control device is communicatively connected to an energy management system, and the energy management system is also communicatively connected to multiple energy storage converters. Referring to the figure, the method includes: S21. Real-time acquisition of total power data on the low-voltage side of the transformer substation.

[0045] S22. In response to the data request instruction sent by the energy management system, transmit the total power data to the energy management system so that the energy management system determines the power setting value of each of the energy storage converters based on the total power data.

[0046] Steps S21-S22 correspond to steps S11-S12. Please refer to them. Figure 5 As shown in the figure, the Energy Management System (EMS) collects the total power data of the low-voltage side of the transformer substation in real time by reading data from registers (e.g., 0x0100). Based on this, it calculates the load rate of the transformer substation. The power constraint in the figure can be a safe power threshold. If the safe power threshold is exceeded, the power setting value of each energy storage converter PCS is reduced according to a preset adjustment strategy (e.g., a proportional adjustment strategy). Corresponding instructions are sent to each PCS. Each PCS can obtain its own corresponding power setting value and adjust its current power accordingly. After completion, it returns status data to the EMS. The EMS can confirm whether the power constraint condition is met based on the returned status data and record the relevant data.

[0047] S23. When an abnormal state of the transformer is detected, the circuit breaker of the transformer is controlled to trip, and a trip signal is reported to the energy management system, so that the energy management system sends an emergency shutdown command to the energy storage converter according to the trip signal, wherein the abnormal state includes at least one of overvoltage, overcurrent, short circuit, and islanding.

[0048] This step S23 matches step S13. Please refer to the relevant steps. Figure 6 As shown in the figure, the Energy Management System (EMS) obtains status data by reading the status register (e.g., 0x0001). When the transformer substation monitoring and control system detects an abnormal state, it controls the circuit breaker of the transformer substation to trip and returns a trip status (e.g., 0x0002) as a trip signal. Therefore, the EMS can obtain this trip status the next time it reads the register and send an emergency shutdown command to all energy storage converter PCSs via broadcast. Each energy storage converter PCS will immediately execute the shutdown sequence according to the received emergency shutdown command and return a confirmation status to notify the EMS that the shutdown has been completed. The EMS will record the event log, update the system status, and trigger an alarm notification based on the received confirmation status to alert the staff that a fault has occurred.

[0049] In some embodiments, the method further includes: S24. When a power grid failure is detected, a power failure signal is sent to the energy management system so that the energy management system issues a tripping command.

[0050] S25. In response to the tripping command of the energy management system, control the circuit breaker of the transformer substation to trip, so as to physically isolate the power grid from the energy storage converter.

[0051] Steps S24-S25 correspond to steps S14-S15. After detecting a power outage, the transformer substation monitoring and control device sends a power outage signal to the Energy Management System (EMS). Upon receiving the signal, the EMS selects one energy storage converter (PCS) as the master unit to start. The master unit outputs stable voltage and frequency as the reference parameters for microgrid operation and issues a tripping command to the transformer substation monitoring and control device to control the circuit breaker tripping, achieving physical isolation between the microgrid and the power outage grid, preventing backflow of power or grid recovery impacts, and ensuring grid maintenance safety. Simultaneously, it instructs the remaining PCS to start as slave units and synchronously track the voltage and frequency references of the master unit. Ultimately, the master unit and slave units form the microgrid power supply end, continuously supplying power to the load. Even after a power outage, the microgrid can autonomously construct its own power supply through the energy storage system without relying on external power sources to meet the emergency power needs of the load.

[0052] This application also provides an embodiment of an energy management system 500, please refer to [link to relevant documentation]. Figure 7 This diagram illustrates the hardware structure of a slave energy management system 500 capable of performing the methods described in the above embodiments. The slave energy management system 500 includes: at least one processor 51; and a memory 52 communicatively connected to the at least one processor 51. Figure 7 Taking a processor 51 as an example, the memory 52 stores instructions executable by the at least one processor 51. These instructions, when executed by the at least one processor 51, enable the at least one processor 51 to perform the data interconnection method described in the above embodiment. The processor 51 and the memory 55 can be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0053] The memory 52, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the device-data interconnection method in the embodiments of this application. The processor 51 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory 52, thereby implementing the device-data interconnection method described in the above embodiments.

[0054] The memory 52 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computing device. Furthermore, the memory 52 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 52 may optionally include memory remotely located relative to the processor 51, and these remote memories may be connected to the computing device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0055] The one or more modules are stored in the memory 52, and when executed by the one or more processors 51, the data interconnection method described in the above embodiments is performed.

[0056] The above-described product can execute the methods provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for executing the methods. Technical details not described in detail in this embodiment can be found in the data interconnection method described in the embodiments of this application.

[0057] This application also provides a transformer substation monitoring and control device 700, please refer to [link / reference]. Figure 8 The diagram illustrates the hardware structure of a transformer substation monitoring and control device 1 capable of executing the methods described in the above embodiments. The transformer substation monitoring and control device 1 includes: at least one processor 71; and a memory 72 communicatively connected to the at least one processor 71. Figure 8 Taking a processor 71 as an example, the memory 72 stores instructions executable by the at least one processor 71. These instructions, when executed by the at least one processor 71, enable the at least one processor 71 to perform the data interconnection method described in the above embodiment. The processor 71 and the memory 72 can be connected via a bus or other means. Figure 8 Taking the example of a connection between China and Israel via a bus.

[0058] The memory 72, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the device-data interconnection method in the embodiments of this application. The processor 71 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory 72, thereby implementing the device-data interconnection method described in the above embodiments.

[0059] The memory 72 may include a stored program area and a stored data area. The stored program area may store the operating system and applications required for at least one function; the stored data area may store data created based on the use of the computing device. Furthermore, the memory 72 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 72 may optionally include memory remotely located relative to the processor 71, and these remote memories may be connected to the computing device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0060] The one or more modules are stored in the memory 72, and when executed by the one or more processors 71, the data interconnection method described in the above embodiments is performed.

[0061] The above-described product can execute the methods provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for executing the methods. Technical details not described in detail in this embodiment can be found in the data interconnection method described in the embodiments of this application.

[0062] This application provides a non-volatile computer-readable storage medium storing computer-executable instructions. These instructions are executed by one or more processors to enable the at least one processor to perform the data interconnection method described in the above embodiments. For example, the non-volatile computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CDROM), magnetic tape, floppy disk, or optical data storage device, etc.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above. For the sake of brevity, they are not provided in detail; although this application has been described in detail with reference to the foregoing embodiments, 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 data interconnection method applied to an energy management system, wherein the energy management system is communicatively connected to a transformer substation monitoring and control device and multiple energy storage converters, characterized in that, The method includes: Send a data request command to the transformer substation monitoring and control device so that the transformer substation monitoring and control device transmits the first total power of the low-voltage side of the transformer substation to the energy management system; The power setting value of each energy storage converter is determined based on the first total power, and the power setting value is transmitted to the corresponding energy storage converter so that the energy storage converter adjusts its current power according to the power setting value. When the trip signal of the transformer substation monitoring and control device is received, an emergency shutdown command is sent to the energy storage converter to shut down the energy storage converter.

2. The method according to claim 1, characterized in that, Determine the power setting value for each of the energy storage converters based on the first total power, and transmit the power setting value to the corresponding energy storage converter, so that the energy storage converter adjusts its current power according to the power setting value, including: The product of the safety factor and the rated power of the transformer is used as the safe power threshold. When the first total power is greater than the safe power threshold, the power setting value of each of the energy storage converters is determined according to the safe power threshold, so that the sum of the power of the energy storage converters is less than or equal to the safe power threshold.

3. The method according to claim 1, characterized in that, Upon receiving a trip signal from the transformer substation monitoring and control device, an emergency shutdown command is sent to the energy storage converter to shut it down, including: The status data of the transformer substation monitoring and control device is obtained through polling. When a trip signal is obtained based on the status data, an emergency shutdown command is generated; The emergency shutdown command is broadcast in parallel to all the energy storage converters with the highest priority, so that the energy storage converters shut down in response to the emergency shutdown command and send back confirmation information to the energy management system. Upon receiving the confirmation information, an event log is generated based on the confirmation information.

4. The method according to claim 1, characterized in that, The method further includes: Upon receiving a power failure signal from the transformer substation monitoring and control device, a storage converter is controlled to start as the main unit, so that the main unit outputs a stable microgrid voltage and frequency reference. A tripping command is sent to the transformer substation monitoring and control device so that the transformer substation monitoring and control device controls the circuit breaker of the transformer substation to trip. The remaining energy storage converters are controlled to start as slaves and synchronized with the microgrid voltage and the frequency reference to form a microgrid power supply terminal with the host to supply power to the load.

5. The method according to claim 1, characterized in that, The energy management system also connects to external devices via an industrial firewall, and the method further includes: When connecting to external devices, the industrial firewall filters the communication data of the external devices based on the principle of least privilege. The communication data includes at least one of communication address, communication port, and function code.

6. The method according to claim 1, characterized in that, The method further includes: Send a first temperature command to the transformer substation monitoring and control device to obtain the winding temperature of the transformer substation through the transformer substation monitoring and control device; Send a second temperature command to the energy storage converter to obtain the power tube temperature through the energy storage converter; The daily rate of change of the transformer winding temperature is calculated based on the winding temperature at different times. If the daily rate of change exceeds a preset threshold and continues for a preset time, and the temperature of the power tube of at least one energy storage converter rises abnormally, an early warning message is generated. The early warning message is used to prompt the inspection of common heat dissipation channels or environmental factors.

7. A data interconnection method applied to a prefabricated substation monitoring and control device, wherein the prefabricated substation monitoring and control device is communicatively connected to an energy management system, and the energy management system is also communicatively connected to multiple energy storage converters, characterized in that... The method includes: Real-time acquisition of total power data on the low-voltage side of the transformer substation; In response to a data request instruction sent by the energy management system, the total power data is transmitted to the energy management system so that the energy management system determines the power setpoint of each of the energy storage converters based on the total power data. When an abnormal state of the transformer is detected, the circuit breaker of the transformer is controlled to trip, and a trip signal is reported to the energy management system, so that the energy management system sends an emergency shutdown command to the energy storage converter according to the trip signal. The abnormal state includes at least one of overvoltage, overcurrent, short circuit, and islanding.

8. The method according to claim 7, characterized in that, The method further includes: When a power grid failure is detected, a power failure signal is sent to the energy management system, so that the energy management system issues a trip command; In response to the tripping command of the energy management system, the circuit breaker of the transformer substation is controlled to trip, so as to physically isolate the power grid from the energy storage converter.

9. An energy management system, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the method according to any one of claims 1-6.

10. A transformer substation monitoring and control device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of claim 7 or 8.

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