Transformer substation direct current communication device and control method thereof

Abstract

The invention discloses a transformer substation direct current communication device and a control method thereof, and the device comprises at least two communication interface modules which are respectively used for connecting a direct current monitoring device and a storage battery discharge instrument; the protocol analysis and conversion module is connected with the communication interface module and is used for analyzing communication protocols from different devices and converting the communication protocols into a unified internal data format; the data interaction and control module is connected with the protocol analysis and conversion module and is used for realizing bidirectional forwarding of data between the direct current monitoring device and the storage battery discharge instrument according to a preset rule; the storage module is used for storing configuration parameters, historical communication data and log information; and the power supply module is used for providing a working power supply for the device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of substation DC system, and particularly relates to a substation DC communication device and a control method thereof. BACKGROUND

[0002] The substation DC system is the heart of guaranteeing safe and reliable operation of the substation, and provides stable operating power for important devices such as relay protection, automatic device, circuit breaker tripping and closing. Among them, the DC monitoring device is responsible for real-time monitoring of key parameters such as DC bus voltage, charging module state and insulation condition. The battery pack is the last line of defense of the DC system, and when the whole station AC system fails, the battery pack bears the load of the whole station secondary equipment and automatic equipment. The capacity of the battery pack determines the reliability of the last line of defense of the whole station. At present, whether the battery capacity is qualified is checked by battery capacity test, and maintenance personnel need to arrive at the substation to use the battery discharge instrument for capacity test. The test wiring is complicated, the wiring time is long, and errors are easy to occur.

[0003] At present, the battery voltage acquisition device of the battery discharge instrument and the battery voltage acquisition device of the DC system cannot be interchanged, and each uses its own independent communication protocol and interface. This leads to the fact that they cannot directly exchange data, forming an "information island".

[0004] This situation brings many inconveniences: first, the maintenance personnel need to spend a lot of time on battery discharge instrument battery voltage acquisition line wiring work, the wiring is relatively complicated and prone to errors, and is limited by small screen cabinet space and other problems. The battery acquisition line wiring consumes a lot of time and is low in work efficiency. Second, the battery discharge instrument and the DC battery pack battery voltage acquisition instrument cannot share data. Third, the wiring space in the screen cabinet is small, and there is a safety risk of electric shock.

[0005] Therefore, there is an urgent need for a device that can be compatible with different manufacturers' equipment and unify the communication standard to solve the above data communication bottleneck problem, realize data sharing between the DC battery discharge instrument and the DC system battery voltage acquisition device, reduce the workload of maintenance personnel and improve work efficiency. SUMMARY

[0006] The present application provides a substation DC communication device and a control method thereof to solve the above problems.

[0007] In one aspect, the present application provides a substation DC communication device, which comprises: at least two communication interface modules for connecting a DC monitoring device and a battery discharge instrument, respectively; a protocol analysis and conversion module connected with the communication interface module, for analyzing the communication protocols from different devices and converting them into a unified internal data format; a data interaction and control module, connected with the protocol analysis and conversion module, for realizing bidirectional forwarding of data between the DC monitoring device and the battery discharge instrument according to preset rules; a storage module for storing configuration parameters, historical communication data and log information; a power module for providing working power for the device.

[0008] In an implementation manner of the application, the communication interface module comprises a physical layer interface, which is at least two of RS485, RS232 and Ethernet interface; the device simultaneously establishes independent communication links with the DC monitoring device and the battery discharge instrument through the communication interface module.

[0009] In an implementation manner of the application, the protocol analysis and conversion module can analyze and convert Modbus RTU / TCP, IEC 61850 standard protocol and at least one device private protocol; the module extracts valid data payload after analyzing the data frame from one device, and re-encapsulates according to the protocol format recognizable by the target device by running a protocol conversion program.

[0010] In an implementation manner of the application, the data interaction and control module has data filtering, caching and priority processing functions; the module is configured to be able to automatically send a control instruction to the battery discharge instrument to start a discharge detection process when receiving an abnormal alarm signal from the DC monitoring device according to a preset intelligent linkage rule.

[0011] In an implementation manner of the application, the device further comprises a high-level electromagnetic compatibility protection module, which adopts optical and electrical isolation technology to maintain uninterrupted communication in a strong electromagnetic interference environment of a substation.

[0012] In an implementation manner of the application, the device adopts a modular hardware architecture and supports hot plugging of functional modules; the communication interface module further comprises a dual-network redundant interface, which adopts an A / B dual Ethernet interface architecture and can be configured in a redundant working mode to realize high availability of the communication link.

[0013] On the other hand, the application also provides a control method of a substation DC communication device, which comprises the following steps: Step S1: after the device is powered on, loading configuration parameters from the storage module to complete initialization of each communication interface module and functional module; Step S2: real-time monitoring of each communication interface to receive data frames from the DC monitoring device or the battery discharge instrument; Step S3: Parse the received data frames, determine their protocol type and source, extract valid data, and convert them into a unified internal data format; Step S4: According to the preset forwarding rules, send the converted data to the target device.

[0014] In one implementation of this application, in step S4, a substation event GOOSE mechanism oriented towards general objects is used to transmit switch status change signals, and / or a sampled value SV mechanism is used to transmit analog data, thereby realizing millisecond-level data publishing and transmission in the network.

[0015] In one implementation of this application, the method further includes a status monitoring and intelligent early warning step, specifically: real-time monitoring of the working status of each module inside the device, the quality of the communication link, and the key operating parameters of the DC system; predicting potential faults through data analysis algorithms, and recording abnormal events, early warning information, and key operations in the log of the storage module, while uploading them to the background monitoring system through the communication interface.

[0016] In one implementation of this application, in step S4, intelligent linkage logic is embedded, specifically: a trigger condition associated with the DC system operating state is preset; when the trigger condition is determined by parsing the data from the DC monitoring device, a corresponding control command is automatically generated and sent to the battery discharge instrument to start or adjust the discharge process.

[0017] The DC communication device and control method for a substation provided in this application have the following beneficial effects: 1. Achieving data sharing and interoperability: This device acts as a data hub, breaking down information barriers between the DC monitoring device and the battery discharger through protocol parsing and conversion, enabling automatic data interaction and sharing, and greatly improving operation and maintenance efficiency.

[0018] 2. Constructing an intelligent maintenance closed loop: Through preset linkage rules, the device can automatically trigger discharge detection based on monitoring alarm signals, forming an automated intelligent closed loop of "monitoring-diagnosis-control", which significantly improves the system's intelligence level and maintenance timeliness.

[0019] 3. Enhanced safety and unified management: This device replaces the traditional cumbersome manual wiring and data recording with automated data interaction, reducing the operational risks and human errors of personnel in high-pressure environments, and providing a unified data foundation for overall risk assessment. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A block diagram of a substation DC communication device provided in this application embodiment; Figure 2 A flowchart illustrating a control method for a DC communication device in a substation, as provided in this application embodiment. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This application provides a DC communication device for a substation and its control method. The technical solution proposed in this application will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 This is a block diagram illustrating the composition of a DC communication device for a substation, as provided in an embodiment of this application. Figure 1 As shown, the device mainly includes: At least two communication interface modules are provided, one for connecting the DC monitoring device and the other for connecting the battery discharge instrument, supporting multiple physical interfaces such as RS485, RS232, and Ethernet. The protocol parsing and conversion module, connected to the communication interface module, is used to parse communication protocols from different devices and convert them into a unified internal data format; The data interaction and control module is connected to the protocol parsing and conversion module and is used to realize bidirectional data forwarding between the DC monitoring device and the battery discharge instrument according to preset rules. The storage module is used to store configuration parameters, historical communication data, and log information. A power module is used to provide operating power to the device.

[0024] In this application, the communication interface module includes a physical layer interface, which is at least two of the following types: RS485, RS232, and Ethernet. The device establishes independent communication links with both the DC monitoring device and the battery discharge instrument simultaneously through the communication interface module.

[0025] In this application, the protocol parsing and conversion module can parse and convert Modbus RTU / TCP, IEC61850 standard protocol and at least one device proprietary protocol. The module parses the data frame from one device by running a protocol conversion program, extracts the valid data payload, and re-encapsulates it according to the protocol format that the target device can recognize.

[0026] DC monitoring devices and battery discharge instruments typically use different communication protocols. The communication device runs a protocol conversion program through a central processing unit to parse and repackage data sent by the DC monitoring device that conforms to one protocol (such as Modbus-RTU) into data that the battery discharge instrument can recognize (such as a manufacturer's proprietary protocol), and vice versa, thereby enabling data exchange between devices using different protocols.

[0027] In this application, the data interaction and control module has data filtering, caching and priority processing functions; the module is configured to automatically send a control command to the battery discharge instrument to start the discharge detection process when it receives an abnormal alarm signal from the DC monitoring device according to preset intelligent linkage rules.

[0028] Specifically, the data interaction and control module possesses comprehensive data processing and intelligent control capabilities. This module has a built-in data filtering mechanism that can identify and remove invalid or abnormal data frames, ensuring the validity of transmitted data; it integrates a data buffer to temporarily store critical data during communication interruptions, ensuring data transmission integrity upon link restoration; and it supports data priority management, assigning the highest transmission priority to critical data such as alarm signals to ensure real-time response. More importantly, this module is configured to execute preset intelligent linkage rules: when a specific abnormal alarm signal (such as abnormal battery voltage or excessive internal resistance) is received from a DC monitoring device through data parsing, it automatically generates and sends precise control commands (such as initiating capacity testing, adjusting discharge parameters, or emergency stop) to the connected battery discharge instrument without manual intervention, thereby triggering and executing a precise discharge detection process, achieving an automated intelligent closed loop from fault monitoring to diagnosis and treatment.

[0029] In this application, the device further includes a high-level electromagnetic compatibility protection module, which employs opto-isolation and electrical isolation technologies to maintain uninterrupted communication in the strong electromagnetic interference environment of a substation.

[0030] Specifically, the high-level electromagnetic compatibility (EMC) protection module is crucial for ensuring the stable operation of the device in complex electromagnetic environments. This module integrates opto-isolation and electrical isolation technologies. It achieves electrical isolation of signal transmission through components such as optocouplers, and utilizes isolation transformers or dedicated isolation chips to enhance the isolation of power and communication lines, effectively blocking common-mode interference and surge impacts. This design ensures that the device can pass the rigorous high-level electromagnetic compatibility (EMC) Level 4 test, thereby maintaining uninterrupted communication links and error-free data transmission even under strong electromagnetic interference environments generated by substation circuit breaker operation and switching surges, guaranteeing the long-term stability and reliability of the entire system's data transmission.

[0031] In this application, the device adopts a modular hardware architecture that supports hot-swapping of functional modules; the communication interface module further includes a dual-network redundant interface, adopts an A / B dual Ethernet port architecture, and can be configured to a redundant working mode to achieve high availability of the communication link.

[0032] Specifically, the device adopts an advanced modular hardware architecture design, with each core functional unit, such as the communication interface module, protocol processing module, and power supply module, using independent standard hardware modules. This design enables the device to support online hot-swapping of critical functional modules. When a single module needs maintenance, upgrade, or fails, it can be replaced without affecting the overall operation of the device, greatly improving the maintainability and availability of the system. Simultaneously, the communication interface module further integrates a highly reliable dual-network redundant interface, specifically adopting an A / B dual Ethernet port architecture. This architecture allows the two network interfaces to be configured in redundant operating modes, running simultaneously in parallel or primary / backup mode. When the primary communication link (Network A) is interrupted or degraded, the system can automatically and without delay switch to the backup link (Network B) to continue data transmission, thereby achieving high availability of the communication link and ensuring that critical monitoring and control data is never interrupted in harsh industrial environments.

[0033] The above describes a substation DC communication device according to an embodiment of this application. Based on the same inventive concept, this application also provides a control method for the substation DC communication device. Figure 2 A flowchart illustrating a control method for a substation DC communication device provided in this application embodiment is shown below. Figure 2 As shown, the system mainly includes: This application also provides a control method for a substation DC communication device, the method including the following steps: Step S1: After the device is powered on, the configuration parameters are loaded from the storage module to complete the initialization of each communication interface module and functional module; Step S2: Monitor each communication interface in real time and receive data frames from the DC monitoring device or battery discharge instrument; Step S3: Parse the received data frames, determine their protocol type and source, extract valid data, and convert them into a unified internal data format; Step S4: According to the preset forwarding rules, send the converted data to the target device.

[0034] In this application, in step S4, the substation event GOOSE mechanism for general objects is used to transmit switch status change signals, and / or the sampled value SV mechanism is used to transmit analog data, so as to realize millisecond-level data publishing and transmission in the network.

[0035] Specifically, at the data transmission level, it deeply integrates the core services of the substation communication standard IEC 61850. Specifically, it adopts the General Object-Oriented Substation Event (GOOSE) mechanism to rapidly publish switch status change signals such as circuit breaker position and protection actions via multicast, achieving end-to-end transmission of critical information such as tripping and interlocking. Simultaneously, it can employ a Sample Value (SV) mechanism to continuously transmit instantaneous analog values ​​such as voltage and current from the merging unit at a high sampling rate. Both mechanisms are based on high-speed Ethernet, employing a publish / subscribe model at the underlying layer, supplemented by high-precision time synchronization. Together, they ensure stable and reliable publication and transmission of various types of data in the network with extremely low latency at the millisecond or even microsecond level, meeting the stringent real-time requirements of the power system.

[0036] In this application, the method further includes a status monitoring and intelligent early warning step, specifically: real-time monitoring of the working status of each module inside the device, the quality of the communication link, and the key operating parameters of the DC system; predicting potential faults through data analysis algorithms, and recording abnormal events, early warning information, and key operations in the log of the storage module, while uploading them to the background monitoring system through the communication interface.

[0037] In this application, intelligent linkage logic is embedded in step S4, specifically: trigger conditions associated with the DC system's operating state are preset; when the trigger conditions are met by parsing data from the DC monitoring device, corresponding control commands are automatically generated and sent to the battery discharge instrument to initiate or adjust the discharge process. First, trigger conditions closely related to key DC system operating states are preset in the system, such as excessive total battery voltage, abnormal internal resistance of a single battery cell, or decreased insulation. When the protocol parsing module parses and judges the real-time data from the DC monitoring device and confirms that any preset trigger condition is met, the data interaction and control module will no longer perform simple data forwarding, but will immediately automatically generate precise control commands (such as "start core capacity discharge," "switch to constant power mode," or "terminate test") based on the built-in expert rule base or control algorithm, and send them to the battery discharge instrument, thereby achieving automatic initiation, parameter adjustment, or safety intervention of the discharge process, forming a highly intelligent and fast-responding closed-loop control.

[0038] The following are specific examples of how this application is used in particular scenarios.

[0039] A 220kV substation needs to conduct periodic capacity discharge tests on its 110V DC system's battery banks to verify their actual capacity. The substation already has a DC monitoring device from Manufacturer A, while the maintenance team uses a battery discharge meter from Manufacturer B. Traditional methods require manual installation of dozens of voltage acquisition lines within the confined space of the DC control cabinet, taking 1-2 hours and posing risks of incorrect wiring and electric shock.

[0040] The implementation process after applying this device is as follows: (1) Hardware Connection: Install this communication device inside the DC power supply cabinet. Connect it to the RS485 port of Manufacturer A's DC insulation monitoring device using a standard communication cable via its RS485 communication interface module. Connect it to the Ethernet port of Manufacturer B's battery discharger using a network cable via its Ethernet interface module. Turn on the power module of this device.

[0041] (2) Initialization and Configuration: After the device is powered on, it automatically loads the pre-configured parameters from the storage module. Maintenance personnel log in to the device's Web configuration interface via a laptop computer to make final settings: specify that the interface connecting to the DC monitoring device uses the Modbus-RTU protocol. Specify that the interface connecting to the battery discharger uses the proprietary TCP protocol of vendor B. In the data interaction and control module, a smart linkage rule is preset: when the "battery pack float charge voltage abnormal" alarm signal is received from the DC monitoring device, the "start constant current discharge" command is automatically sent to the discharger.

[0042] (3) Working Process: Data Sharing: After the maintenance personnel initiate the capacity test command, the discharge instrument does not need to be connected to the actual battery voltage acquisition line. This device obtains the voltage data of each battery cell from the DC monitoring device in real time via the Modbus-RTU protocol, unpacks it through the protocol parsing and conversion module, extracts the voltage value, and then repackages it according to the proprietary protocol format of Manufacturer B, and sends it to the discharge instrument via the Ethernet port. The discharge instrument performs capacity calculation based on this, eliminating the need for tedious manual wiring.

[0043] Intelligent linkage: During the test, the DC monitoring device detected a sharp drop in the voltage of a certain battery and immediately issued an alarm signal. The data interaction and control module of this device recognized this signal according to preset rules, automatically generated and forwarded a "pause discharge" command to the discharge instrument, preventing over-discharge damage to the battery and realizing a closed loop of "monitoring-control".

[0044] Stability Guarantee: Throughout the process, the operation of circuit breakers within the substation generated strong electromagnetic interference. The device's EMC protection module (employing opto-isolation technology) effectively isolated the interference, ensuring that the communication link remained uninterrupted and data errors did not occur. Simultaneously, the dual-network redundant interfaces were in hot standby mode, guaranteeing high availability of communication.

[0045] Status monitoring: The device's data interaction and control module continuously records the communication status, triggered events (such as protocol conversion counts, linkage command execution records), and key system parameters into the storage module's logs and uploads them to the background monitoring system for analysis by maintenance personnel.

[0046] After applying this device, the preparation time for this capacity test was reduced from 1.5 hours to less than 10 minutes, requiring only the connection of power lines and a few communication lines. This avoids prolonged wiring operations by personnel inside the high-voltage cabinet, significantly reducing safety risks. Simultaneously, through intelligent linkage functions, rapid automatic response to battery anomalies is achieved, improving the safety and intelligence level of the test. Test data is seamlessly shared through automatic protocol conversion, ensuring data integrity and accuracy, and providing a reliable basis for battery pack status assessment. This example demonstrates that the present invention effectively solves the "information silo" problem between different devices, achieving data sharing and intelligent control, and significantly improving the efficiency and safety of substation DC system operation and maintenance.

[0047] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0048] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A substation DC communication device, characterized by, The device comprises: at least two communication interface modules for connecting the DC monitoring device and the battery discharge instrument respectively; a protocol analysis and conversion module connected with the communication interface modules, for analyzing the communication protocols from different devices and converting them into a unified internal data format; a data interaction and control module connected with the protocol analysis and conversion module, for realizing the bidirectional forwarding of data between the DC monitoring device and the battery discharge instrument according to preset rules; a storage module for storing configuration parameters, historical communication data and log information; a power module for providing working power for the device.

2. The substation DC communication device of claim 1, wherein, The communication interface modules comprise physical layer interfaces of at least two types selected from RS485, RS232 and Ethernet ports; the device simultaneously establishes independent communication links with the DC monitoring device and the battery discharge instrument through the communication interface modules.

3. The substation DC communication device of claim 1, wherein, The protocol analysis and conversion module can analyze and convert Modbus RTU / TCP, IEC 61850 standard protocols and at least one device private protocol; the module extracts valid data payloads after analyzing the data frames from one device, and re-encapsulates them according to the protocol format recognizable by the target device by running a protocol conversion program.

4. The substation DC communication device of claim 1, wherein, The data interaction and control module has data filtering, caching and priority processing functions; the module is configured to automatically send control instructions to the battery discharge instrument to start the discharge detection process when receiving abnormal alarm signals from the DC monitoring device according to preset intelligent linkage rules.

5. The substation DC communication device of claim 1, wherein, The device further comprises a high-level electromagnetic compatibility protection module which uses photoelectric isolation and electrical isolation technology to maintain uninterrupted communication in a strong electromagnetic interference environment of a substation.

6. The substation DC communication device of claim 1, wherein, The device adopts a modular hardware architecture and supports hot plugging of functional modules; the communication interface modules further comprise dual-network redundant interfaces which adopt an A / B dual Ethernet port architecture and can be configured in a redundant working mode to realize high availability of the communication link.

7. A control method of a substation DC communication device, characterized by, The method comprises the following steps: Step S1: after the device is powered on, load the configuration parameters from the storage module to complete the initialization of each communication interface module and functional module; Step S2: real-time monitor each communication interface to receive data frames from the DC monitoring device or the battery discharge instrument; Step S3: analyze the received data frames, judge their protocol types and sources, extract valid data and convert them into a unified internal data format; Step S4: send the converted data to the target device according to the preset forwarding rules.

8. The control method of a substation DC communication device according to claim 7, characterized by, In the step S4, use the generic object-oriented substation event (GOOSE) mechanism to transmit the on-off state change signals, and / or use the sampled value (SV) mechanism to transmit analog quantity data, to realize millisecond-level data publishing and transmission in the network.

9. The control method of a substation DC communication device according to claim 7, characterized by, The method further comprises a state monitoring and intelligent early warning step, specifically: real-time monitor the working states of each module inside the device, the communication link quality and the key operating parameters of the DC system; Through a data analysis algorithm, potential faults are predicted, and abnormal events, early warning information and key operations are recorded in the log of the storage module, and uploaded to the background monitoring system through a communication interface.

10. The control method of a substation DC communication device according to claim 7, characterized by, In the step S4, intelligent linkage logic is embedded, specifically: A trigger condition associated with the operating state of the DC system is preset; When it is determined through analysis of data from the DC monitoring device that the trigger condition is met, a corresponding control instruction is automatically generated and sent to the battery discharge instrument to start or adjust the discharge process.

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