Modularized line connection management and control metering sampling system

Abstract

The invention discloses a modularized line contact control metering and sampling system, which relates to the technical field of power system automation, and comprises a metering and sampling unit, an alternating current sampling and metering module and a data processing module, comprise current, voltage effective values, power factors, phase angles, frequency parameters, active power, reactive power, apparent power and electric energy data; and the data processing module is used for processing and storing the data acquired by the alternating current acquisition metering module. Compared with a ferrite magnetic core scheme, the open type current transformer adopting the ultracrystalline magnetic core has the beneficial effects that the calculation error is controlled to be about 0.2% during small current acquisition, and the metering precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation, and in particular to a modular line connection control metering sampling system. Background Art

[0002] Line contact control and metering sampling technology in the distribution network is a key link in the intelligent operation and maintenance of the power system. In the traditional distribution network architecture, the line contact point mainly uses closed-end current transformers for metering and sampling. This mode requires hardware access to obtain key parameters such as current and voltage. With the in-depth practice of the concept of self-healing distribution network, the topology of the distribution network presents a dynamic and reconfigurable characteristic, and the frequent changes in the line operation mode put forward higher requirements for the accuracy of the branch line loss calculation. The existing contact point metering devices generally have problems such as low integration, scattered functional modules, and complex installation and maintenance. Especially during the equipment installation process, the access of traditional closed-end current transformers requires the simultaneous coordination of power outages of multiple 10kV lines, which not only increases the difficulty of construction, but also affects the reliability of power supply. Although the open-end current transformers currently used in the market can be installed without power outages, due to the use of conventional ferrite cores, there is a problem of insufficient accuracy when collecting small currents, which is difficult to meet the technical requirements of high-precision measurement.

[0003] In the actual operation of the distribution automation system, the data acquisition device at the line contact point often needs to have multiple functions such as metering, control and communication. However, the functional modules in the existing technical solutions are often configured independently. This design method not only causes the equipment cost to rise, but also increases the complexity of the system. Especially in terms of data acquisition accuracy, it is difficult for traditional devices to achieve power-free installation while ensuring high accuracy, which seriously restricts the progress of intelligent transformation of distribution networks. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a modular line connection control metering sampling system, which can solve the problems mentioned in the background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a modular line connection control metering sampling system, which includes a metering sampling unit, including a cross-collection metering module and a data processing module, wherein: the cross-collection metering module is used to collect three-phase electric energy data of the line connection point, including current, voltage effective value, power factor, phase angle, frequency parameters, and active power, reactive power, apparent power and electric energy data; the data processing module is used to process and store the data collected by the cross-collection metering module;

[0007] The communication management unit includes a multi-channel communication interface module and a data transmission module, wherein: the multi-channel communication interface module includes a Bluetooth interface, a mobile communication interface, a bus interface, an Ethernet interface and a carrier interface; the data transmission module is used to realize data interaction between the monitoring center and the terminal device;

[0008] A control unit is connected to the metering sampling unit and the communication management unit, and is used to configure system parameters and monitor operating status, perform system self-diagnosis and record abnormal information, and perform backup management of important data.

[0009] As a preferred solution of the modular line connection control metering sampling system described in the present invention, the connection metering module includes a current acquisition device, a voltage acquisition device and an electric energy metering chip; the current acquisition device includes an open-type current transformer based on the Hall effect principle and a signal conditioning circuit composed of an instrument amplifier and a low-pass filter, and the output signals of the current acquisition device and the voltage acquisition device are processed by the electric energy metering chip and transmitted to the data processing module.

[0010] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the data processing of the data processing module is specifically as follows: data is received from the external transmission interface, and then the data integrity is determined. If the data is complete, the protocol type is determined. If there is a corresponding protocol, data processing is performed, and finally sent to the corresponding transmission medium.

[0011] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the multi-channel communication interface module of the communication management unit adopts the driver layer to realize the modularization of the operation of the underlying hardware, abstracts and encapsulates the system interface and the driver interface through the function interface layer, and uses the application layer to realize the calling of each functional module.

[0012] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the control unit adopts a dual watchdog mechanism, including a hardware watchdog and an application layer thread watchdog, to monitor the system operation status; when an abnormality is detected, the system automatically records the abnormality log and performs corresponding recovery operations.

[0013] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the self-diagnosis function of the control unit is specifically: double backup of user drivers, applications, and important parameters; automatic restart of the device when an irreversible abnormality occurs; and limitation of the file size of disk storage.

[0014] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the data transmission module is used to wait for data, receive data, check data integrity, determine the protocol type, process data and send data; if the data is incomplete or the protocol type is not supported, it returns to the waiting data step.

[0015] As a preferred solution of the modular line connection control metering sampling system described in the present invention, the cross-purchase metering module is used for cross-purchase metering initialization, cross-purchase real-time quantity collection, metered electric energy collection and cross-purchase metering operation status monitoring.

[0016] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the system adopts a five-layer software architecture, which is from bottom to top: physical layer, operating system layer, driver layer, function interface layer and application layer; the physical layer is used to implement the underlying hardware of the system functions, and the operating system layer adopts an embedded real-time operating system to complete thread scheduling and synchronization.

[0017] As a preferred solution of the modular line communication control metering sampling system described in the present invention, the data processing module controls the transmission delay, data accuracy and exchange metering accuracy, and meets the corresponding preset threshold requirements.

[0018] The beneficial effects of the present invention are as follows: the open-type current transformer with ultra-microcrystalline magnetic core controls the calculation error of small current collection to about 0.2% compared with the ferrite magnetic core solution, thereby improving the measurement accuracy; by inductively accessing the current line and connecting the voltage line in parallel, the power-off-free installation is realized, thereby avoiding the problem of coordinating the power outages of multiple 10kV lines at the same time; by adopting a modular architecture, each functional module can be configured as needed, thereby reducing the system cost; by reusing the sampling function of the FTU and the existing transformer, there is no need to install additional high-voltage transformers and bidirectional metering electric energy meters, thereby reducing equipment investment and engineering construction costs. The system adopts a five-layer software architecture and a dual watchdog mechanism, thereby improving the reliability of system operation and enhancing the fault self-diagnosis and self-recovery capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a system interaction diagram of the present invention.

[0021] Figure 2It is a flow chart of the system monitoring function of the present invention.

[0022] Figure 3 It is the overall design idea diagram of the present invention.

[0023] Figure 4 This is the main structural diagram of the line connection control and metering device of the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1

[0028] Reference Figure 1 to Figure 4 , which is the first embodiment of the present invention, and this embodiment provides a modular line connection control metering sampling system, which includes a metering sampling unit, including a cross-collection metering module and a data processing module, wherein: the cross-collection metering module is used to collect three-phase electric energy data of the line connection point, including current, voltage effective value, power factor, phase angle, frequency parameters, and active power, reactive power, apparent power and electric energy data; the data processing module is used to process and store the data collected by the cross-collection metering module;

[0029] The communication management unit includes a multi-channel communication interface module and a data transmission module, wherein: the multi-channel communication interface module includes a Bluetooth interface, a mobile communication interface, a bus interface, an Ethernet interface and a carrier interface; the data transmission module is used to realize data interaction between the monitoring center and the terminal device;

[0030] The control unit is connected to the metering sampling unit and the communication management unit, and is used to configure system parameters and monitor operating status, perform system self-diagnosis, record abnormal information, and back up important data.

[0031] The present invention adopts a modular architecture in which three functional units work together. The metering and sampling unit serves as the basic data source. It collects three-phase electric energy data of the line contact point through the cross-collection metering module, including multi-dimensional parameters such as current, voltage, and power. The collected data is standardized and stored by the data processing module; the communication management unit provides support for multiple communication methods through the multi-channel communication interface module, and the data transmission module ensures the reliability of data interaction between the monitoring center and the terminal device; the control unit serves as the management center of the system, coordinating the work of the metering and sampling unit and the communication management unit, and is responsible for core functions such as system parameter configuration, operating status monitoring, fault diagnosis, and data backup. The three functional units realize information exchange through standardized interfaces to form a complete data acquisition, transmission, and control system.

[0032] In the process of intelligent transformation of the power distribution network, the traditional line contact point metering devices have problems such as decentralized functions, single communication mode, and poor system reliability, especially in terms of equipment operation and maintenance and fault handling, there is a lack of effective management methods. The present invention realizes flexible combination of functions through modular design to meet the application requirements of different scenarios; improves the communication adaptability of the system through the design of multi-channel communication interfaces; and enhances the reliability and maintainability of the system through unified management of the control unit. This modular system architecture not only reduces the difficulty of equipment integration, but also improves the operating efficiency of the entire system through the coordination between functional units, providing reliable technical support for the intelligent operation and maintenance of the power distribution network.

[0033] Furthermore, the cross-collection and metering module includes a current acquisition device, a voltage acquisition device and an electric energy metering chip; wherein: the current acquisition device includes an open-type current transformer based on the Hall effect principle and a signal conditioning circuit composed of an instrument amplifier and a low-pass filter, and the output signals of the current acquisition device and the voltage acquisition device are processed by the electric energy metering chip and transmitted to the data processing module.

[0034] The cross-collection metering module of the present invention adopts an innovative three-layer acquisition architecture, including a current acquisition device, a voltage acquisition device and an electric energy metering chip. The core of the current acquisition device is an open-type current transformer based on the Hall effect principle, which cooperates with a precise signal conditioning circuit (including an instrument amplifier and a low-pass filter) to achieve high-precision acquisition of current signals. The signal conditioning circuit can effectively suppress interference and improve signal quality. The output signals of the voltage acquisition device and the current acquisition device are processed by a dedicated electric energy metering chip and transmitted to the data processing module in a standardized format.

[0035] Traditional closed-end current transformers require power outages during installation, and the accuracy is insufficient when collecting small currents. The present invention uses an open-end design based on the Hall effect to achieve power-free installation while ensuring the collection accuracy through a precise signal conditioning circuit. Especially under low current conditions, the collection accuracy can still be maintained at a high level, breaking through the technical bottleneck of traditional solutions. In addition, the standardized output interface design of the module improves the compatibility and scalability of the system.

[0036] Furthermore, the data processing module processes data specifically as follows: receiving data from an external transmission interface, then determining the data integrity, if the data is complete, determining the protocol type, if there is a corresponding protocol, performing data processing, and finally sending the data to a corresponding transmission medium.

[0037] Furthermore, the data transmission module is used to wait for data, receive data, check data integrity, determine the protocol type, process data and send data; if the data is incomplete or the protocol type is not supported, the module returns to the step of waiting for data.

[0038] The present invention designs a complete data processing and transmission link, and adopts a closed-loop processing mechanism of "waiting-receiving-checking-processing-sending". After the system receives data through the external transmission interface, it first performs a data integrity check, confirms that the data is complete, and then determines the protocol type. According to the protocol type, the corresponding processing algorithm is selected, and finally the processed data is sent to the corresponding transmission medium. When it is found that the data is incomplete or the protocol type is not supported, the system will automatically return to the waiting data step to ensure the reliability of data processing.

[0039] Traditional systems often lack a complete error handling mechanism during data processing, which can easily lead to system failures due to data anomalies. The present invention improves the system's fault tolerance and data processing reliability by realizing a complete data processing closed loop. At the same time, the automatic judgment and processing mechanism of the protocol type enables the system to adapt to different data communication standards, thereby improving the system's versatility and adaptability.

[0040] Furthermore, the multi-channel communication interface module of the communication management unit adopts the driver layer to realize the modularization of the operation of the underlying hardware, abstracts and encapsulates the system interface and the driver interface through the function interface layer, and uses the application layer to realize the calling of each functional module.

[0041] The communication management unit of the present invention adopts a three-layer architecture design, including a driver layer, a function interface layer and an application layer. The driver layer directly connects to the underlying hardware to realize the modular encapsulation of hardware operations; the function interface layer abstractly encapsulates the system interface and the driver interface through a unified interface definition and provides a standardized calling method; the application layer implements the calling of each functional module based on the standard interface. This layered design enables different communication interfaces (including Bluetooth, mobile communication, bus, Ethernet and carrier) to operate under a unified framework, realizing the unified management of communication resources.

[0042] In traditional systems, various communication interfaces are often implemented independently and lack unified management, resulting in code duplication and maintenance difficulties. The present invention achieves standardized management of communication interfaces through layered design, reduces system maintenance costs, and improves code reusability. At the same time, this design allows new communication methods to only require the implementation of corresponding driver layer modules, greatly improving the scalability of the system.

[0043] Furthermore, the control unit adopts a dual watchdog mechanism, including a hardware watchdog and an application layer thread watchdog, to monitor the system operation status; when an abnormality is detected, the system automatically records the abnormality log and performs corresponding recovery operations.

[0044] Furthermore, the control unit's self-diagnosis function is specifically: double backup of user drivers, applications, and important parameters; automatic restart of the device when an unrecoverable exception occurs; and limitation of the file size stored on the disk.

[0045] The control unit of the present invention adopts a dual watchdog mechanism for system monitoring, including a hardware watchdog and an application layer thread watchdog. The hardware watchdog is responsible for monitoring the underlying operating status of the system, while the application layer thread watchdog monitors the operating status of each functional module. The self-diagnosis function realizes data reliability protection by performing double backup of user drivers, applications and important parameters. The system sets a file size limit mechanism to prevent storage space from being exhausted. When an abnormality is detected, the system automatically records the abnormality log and performs corresponding recovery operations according to the abnormality level, including automatic restart when necessary.

[0046] Traditional systems generally have problems of insufficient reliability and poor fault recovery capabilities. The present invention significantly improves the system's operational reliability through a dual watchdog mechanism and a complete self-diagnosis function. The dual backup mechanism and automatic recovery function ensure that the system can recover quickly when a fault occurs, minimize the risk of system downtime, and improve the stability and availability of the equipment.

[0047] Furthermore, the exchange and procurement metering module is used for exchange and procurement metering initialization, exchange and procurement real-time quantity collection, metering electric energy collection and exchange and procurement metering operation status monitoring.

[0048] Furthermore, the data processing module controls the transmission delay, data accuracy and exchange measurement accuracy, and meets the corresponding preset threshold requirements.

[0049] The cross-acquisition metering module of the present invention adopts a four-step working mechanism: first, the cross-acquisition metering is initialized to establish sampling parameters and calibration benchmarks; then, electrical parameters are collected in real time, including real-time quantities such as current, voltage, and power; at the same time, the cumulative collection of metered electrical energy is carried out; finally, real-time monitoring of the cross-acquisition metering operating status is implemented. During the data processing process, the system strictly controls the three key indicators of transmission delay, data accuracy, and cross-acquisition metering accuracy. A preset threshold is set for each indicator, and the system ensures the reliability of the measurement results through real-time comparison and automatic calibration. The sampling process adopts adaptive sampling frequency technology to dynamically adjust the sampling parameters according to the signal change characteristics, optimizing the use of system resources while ensuring accuracy.

[0050] Traditional systems often have problems such as large fluctuations in accuracy and inaccurate delay control during data collection. The present invention achieves accurate control of the entire collection process by establishing a complete collection control system. In particular, in terms of transmission delay control, the system can control the delay within a preset range to ensure the timeliness of the data; in terms of metering accuracy, through adaptive sampling technology, stable collection accuracy can be maintained under different working conditions, meeting the needs of smart grids for high-precision real-time data.

[0051] Furthermore, the system adopts a five-layer software architecture, which is from bottom to top: physical layer, operating system layer, driver layer, function interface layer and application layer; the physical layer is used to implement the underlying hardware of the system functions, and the operating system layer uses an embedded real-time operating system to complete thread scheduling and synchronization.

[0052] The present invention adopts a five-layer software architecture design, which is the physical layer, operating system layer, driver layer, function interface layer and application layer from bottom to top. The physical layer is responsible for realizing the underlying hardware functions of the system and providing basic support for the upper layer; the operating system layer adopts an embedded real-time operating system, which is responsible for task scheduling, resource allocation and thread synchronization; the driver layer encapsulates hardware operations; the function interface layer provides a standardized calling interface; and the application layer implements specific business functions. The layers communicate through standard interfaces, realizing the decoupling and modularization of the software architecture.

[0053] The traditional power system software architecture is often chaotic in layers and highly coupled between modules, which makes system maintenance difficult and scalable. The present invention achieves effective decoupling of various functional modules of the system through a clear five-layer architecture design. The introduction of a real-time operating system ensures timely response to key tasks and improves the real-time performance of the system. The standardized interface design enables the system to have good maintainability and scalability, and can flexibly respond to future functional upgrade needs. At the same time, the modular design also facilitates system testing and fault location, improving development efficiency and system reliability.

[0054] Example 2

[0055] Reference Figure 1 , which is the second embodiment of the present invention.

[0056] The present invention adopts a layered modular architecture, and realizes intelligent management and control of line contact points through the coordinated cooperation of three core functional units: a metering sampling unit, a communication management unit, and a control unit.

[0057] The metering sampling unit realizes contactless acquisition of current signals based on the Hall effect open-type current transformer. When the AC current in the measured circuit passes through the transformer, a magnetic field that changes with the current is generated, and the Hall element generates a Hall voltage proportional to it under the action of the magnetic field. This acquisition method avoids the defect that the traditional closed-type transformer needs to be powered off for installation. At the same time, the linearity of signal acquisition is improved by optimizing the layout of the Hall element and the magnetic circuit structure. The weak signal output by the transformer is first amplified by a high-precision instrument amplifier, and the differential input method is used to effectively suppress common-mode interference. Subsequently, the signal is conditioned by a Butterworth low-pass filter, which adopts a second-order structure design, which effectively attenuates high-frequency interference while ensuring passband flatness.

[0058] The signal conditioning circuit adopts a two-stage amplification structure. The first stage adopts a fixed gain design, which mainly completes the initial amplification and impedance matching of the signal; the second stage adopts a programmable gain amplifier, which can automatically adjust the gain according to the input signal amplitude, and realizes high-precision acquisition in the range of -5A to 5A. The conditioned signal is sent to the 16-bit ADC for digital conversion, and the sampling rate can reach 25.6kHz to meet the requirements of harmonic analysis. The digital signal is processed by a dedicated electric energy metering chip with a built-in DSP core. Through complex vector operations, real-time parameters such as voltage, current, active power, reactive power, etc. are obtained, and the cumulative measurement of electric energy is completed.

[0059] The communication management unit adopts a layered architecture to achieve unified management of multiple communication methods. In the driver layer, independent driver modules are implemented for different communication interfaces (such as Bluetooth, 4G, Ethernet, etc.). Each driver module uses interrupts to process data transmission and reception, and cooperates with the DMA transmission mechanism to reduce the CPU load. The function interface layer abstracts the operations of different communication interfaces into a unified interface function through standardized data structure definitions, realizing the decoupling of upper-level applications from specific communication methods. The application layer implements specific business functions based on these standard interfaces, such as data reporting, remote configuration, etc.

[0060] The data processing module uses a state machine to process the communication protocol, realizing a complete "wait-receive-check-process-send" processing flow. After the data frame arrives, the CRC check is first used to ensure data integrity, and then the protocol type is determined. The system supports a variety of protocol types, including IEC 60870-5-101 / 104, DL / T645, etc., and automatically selects the corresponding parsing method through the protocol identification algorithm. The parsed data is encapsulated and forwarded according to the protocol requirements, ensuring data interoperability between different systems.

[0061] As the management center of the system, the control unit realizes complete monitoring and self-diagnosis functions. In the dual watchdog mechanism, the hardware watchdog monitors whether the system is frozen by periodic refresh, and immediately triggers system reset once an abnormality is detected; the application layer thread watchdog monitors the operating status of each functional module through a polling mechanism, generates alarm information and starts the corresponding recovery process when an abnormality is found. The self-diagnosis function regularly detects key indicators such as CPU load, memory usage, storage space, etc., and evaluates the status in combination with preset thresholds. Key files use a dual backup mechanism, and the main and backup files are checked and compared to ensure data consistency.

[0062] The system software adopts a five-layer architecture design, from the bottom to the top, it is the physical layer, operating system layer, driver layer, function interface layer and application layer. The operating system layer adopts a real-time operating system, and ensures timely response to key tasks through a priority scheduling mechanism. The driver layer realizes a unified abstraction of hardware devices and provides a standard driver interface. The function interface layer defines a unified functional interface and realizes modular encapsulation of hardware operations. The application layer implements specific business logic based on these interfaces, and improves the maintainability of the code through modular design.

[0063] The present invention achieves significant technical effects in many aspects through system design and module collaboration.

[0064] In terms of metering and acquisition, the system has broken through the technical bottleneck of traditional solutions. By using a Hall effect open-type current transformer with a high-precision signal conditioning circuit, a metering accuracy of 0.5 is achieved. The measurement error under low current conditions (less than 5% of the rated current) is controlled within 1%, which is more than 50% higher than the traditional solution. At the same time, the open-type design eliminates the need to power off the installation process, significantly improving the efficiency of project implementation, and is expected to reduce the installation time by more than 70%. The dual-stage amplification structure used in conjunction with programmable gain amplification enables the system to maintain stable acquisition accuracy over a wide range of -5A to 5A, with a linearity better than 0.1%, providing a strong guarantee for accurate metering.

[0065] In terms of data processing performance, the system achieves fast acquisition and calculation of electrical parameters through optimized signal processing algorithms and high-speed ADC sampling. The sampling rate can reach up to 25.6kHz, supporting the analysis of up to 31 harmonics, meeting the technical requirements of power quality assessment. Through the vector operation processing of the dedicated power metering chip, the system can complete a complete power parameter calculation within 20ms, and the response speed is 40% higher than that of traditional solutions, providing a reliable data basis for real-time monitoring.

[0066] In terms of communication reliability, the unified management mechanism of multiple communication interfaces significantly improves the reliability of data transmission. The system supports seamless switching of multiple communication modes such as Bluetooth, 4G, and Ethernet, and automatically selects the optimal transmission channel through a priority mechanism. Actual measurements show that in a complex network environment, the data transmission success rate remains above 99.9%, and the transmission delay is controlled within 100ms, which improves the communication efficiency by 30% compared with traditional solutions. The standardized interface design also enables the system to quickly adapt to different communication protocols, significantly reducing the workload of system integration.

[0067] In terms of operational stability, the dual watchdog mechanism and the perfect self-diagnosis function have greatly improved the system reliability. The hardware watchdog can detect system abnormalities and complete reset within 200ms, while the application layer thread watchdog ensures the normal operation of the functional module through polling at 1s intervals. The self-diagnosis function realizes all-round monitoring of the system operation status. Through the preset threshold management mechanism, the system can detect potential faults in advance and issue early warnings. The dual backup mechanism ensures the security of critical data. Even in the event of sudden equipment failure, the data recovery time is controlled within 1s, and the system availability reaches 99.99%.

[0068] In terms of scalability and maintainability, modular hardware and software design provides convenient conditions for system upgrade and optimization. Standardized interface definition means that the addition of new functional modules only requires the implementation of corresponding drivers and applications without modifying the system framework. Practice shows that the development cycle of new functional modules can be shortened by more than 40%. At the same time, the clear hierarchical structure also facilitates fault location and maintenance, significantly improving the maintainability of the system.

[0069] In terms of engineering application value, the design of the present invention fully considers the actual application needs. Features such as power-off-free installation, support for multiple communication methods, and complete self-diagnosis functions greatly reduce the system deployment and maintenance costs. According to actual application data, after adopting this system, the management efficiency of line contact points has increased by more than 60%, the equipment failure rate has decreased by 80%, and the operation and maintenance costs have been reduced by 50%. These effects fully demonstrate the practical value of the present invention in the construction of smart distribution networks.

[0070] The realization of the above technical effects not only meets the current construction needs of smart distribution networks, but also provides reliable technical support for the development of future smart grids. The high precision, high reliability and easy scalability of the system provide a practical solution for the intelligent transformation of distribution networks.

[0071] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A modular line connection control metering sampling system, characterized by: include, The metering sampling unit includes a cross-collection metering module and a data processing module, wherein: the cross-collection metering module is used to collect three-phase electric energy data of the line contact point, including current, voltage effective value, power factor, phase angle, frequency parameters, and active power, reactive power, apparent power and electric energy data; the data processing module is used to process and store the data collected by the cross-collection metering module; The communication management unit includes a multi-channel communication interface module and a data transmission module, wherein: the multi-channel communication interface module includes a Bluetooth interface, a mobile communication interface, a bus interface, an Ethernet interface and a carrier interface; the data transmission module is used to realize data interaction between the monitoring center and the terminal device; A control unit is connected to the metering sampling unit and the communication management unit, and is used to configure system parameters and monitor operating status, perform system self-diagnosis and record abnormal information, and perform backup management of important data.

2. The modular line connection control metering sampling system according to claim 1, characterized in that: The cross-collection and metering module includes a current acquisition device, a voltage acquisition device and an electric energy metering chip; wherein: the current acquisition device includes an open-type current transformer based on the Hall effect principle and a signal conditioning circuit composed of an instrument amplifier and a low-pass filter, and the output signals of the current acquisition device and the voltage acquisition device are processed by the electric energy metering chip and then transmitted to the data processing module.

3. The modular line connection control metering sampling system according to claim 1 is characterized in that: The data processing module performs data processing as follows: receiving data from an external transmission interface, determining data integrity, determining the protocol type if the data is complete, processing the data if there is a corresponding protocol, and finally sending the data to a corresponding transmission medium.

4. The modular line connection control metering sampling system according to claim 1 is characterized in that: The multi-channel communication interface module of the communication management unit adopts the driver layer to realize the modularization of the operation of the underlying hardware, abstracts and encapsulates the system interface and the driver interface through the function interface layer, and uses the application program layer to realize the calling of each functional module.

5. The modular line connection control metering sampling system according to claim 1 is characterized in that: The control unit adopts a dual watchdog mechanism, including a hardware watchdog and an application layer thread watchdog, to monitor the system operation status; when an abnormality is detected, the system automatically records the abnormality log and performs corresponding recovery operations.

6. The modular line connection control metering sampling system according to claim 1 or 5, characterized in that: The self-diagnosis function of the control unit is specifically: double backup of user drivers, applications, and important parameters; automatic restart of the device when an unrecoverable abnormality occurs; Limit the size of files stored on disk.

7. The modular line connection control metering sampling system according to claim 1 or 3, characterized in that: The data transmission module is used for waiting for data, receiving data, checking data integrity, determining the protocol type, processing data and sending data; if the data is incomplete or the protocol type is not supported, the module returns to the step of waiting for data.

8. The modular line connection control metering sampling system according to claim 1, characterized in that: The cross-purchase metering module is used for cross-purchase metering initialization, cross-purchase real-time quantity collection, metered electric energy collection and cross-purchase metering operation status monitoring.

9. The modular line connection control metering sampling system according to claim 8, characterized in that: The system adopts a five-layer software architecture, which is from bottom to top: physical layer, operating system layer, driver layer, function interface layer and application layer; the physical layer is used to implement the underlying hardware of the system functions, and the operating system layer uses an embedded real-time operating system to complete thread scheduling and synchronization.

10. The modular line connection control metering sampling system according to claim 1 or 8, characterized in that: The data processing module controls the transmission delay, data accuracy and exchange measurement accuracy, and meets the corresponding preset threshold requirements.

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