Digital intelligent system for realizing medium and low voltage real type power distribution network

Abstract

The utility model relates to a digital intelligent system for realizing a medium and low voltage real type power distribution network, which belongs to the technical field of power distribution networks, and comprises a transformer substation in-station unit for realizing main power transformation of the power distribution network; the network frame unit is used for constructing a transmission path of the power distribution network; the load unit is used for accessing electric equipment; the fault simulation unit is used for simulating a single-phase earth fault, a short-circuit fault and a disconnection fault of the power distribution network; the defect simulation unit is used for simulating temperature rise and partial discharge defects of the power distribution primary equipment; the power distribution automation master station or the monitoring system is used for monitoring and managing the power distribution network; and the state sensing sensor is used for collecting electrical quantity and state quantity information. According to the utility model, the construction of a digital and intelligent real-model test field and the digital and intelligent upgrading of a stock real-model test field can be guided, and the installation and data transmission of various state sensing sensors and the physical information fusion with an electrical part can be realized, so that the holographic sensing and working condition active early warning of a power distribution network can be realized.

Description

Technical Field

[0001] This utility model relates to a digital intelligent system for realizing a true medium- and low-voltage distribution network, belonging to the field of distribution network technology. Background Technology

[0002] As an important component of the power grid, the distribution network directly serves end users and is closely related to the production and daily life of the general public. It is an important infrastructure for power grid companies to serve the local economy and safeguard national interests and people's livelihoods, and it is also an important link for power grid companies to realize economic benefits and fulfill their social commitments.

[0003] With the continuous deepening of the construction of "three types of networks and two networks, world-class" energy internet enterprises, and the requirements for building a new power system and creating a digital and intelligent strong power grid, the construction of an intelligent operation and maintenance system with holographic perception of distribution networks, proactive early warning of operating conditions, intelligent and efficient decision-making, and high data sharing is the inevitable direction for the development of distribution networks.

[0004] In recent years, full-scale testing technology for power distribution networks has gradually gained attention in the industry. This involves creating a test environment similar to the actual power distribution system on-site using real power distribution equipment, with the system operating at a voltage level of 10kV. Compared to conventional laboratory testing, full-scale testing can more accurately and reliably reproduce actual on-site operating conditions, and can better reproduce the characteristics of electrical faults such as single-phase grounding and phase-to-phase short circuits, thereby improving the testing effect of power distribution automation equipment. Therefore, power grid companies in many parts of China have successively built full-scale testing sites of varying sizes and functions for testing new power distribution automation equipment, verifying new technologies, and training personnel.

[0005] However, existing full-scale test sites mainly reproduce real power distribution networks from the perspective of electrical characteristics. Their components mainly include substation internal parts, grid parts, load parts, fault simulation parts, power distribution automation master stations or monitoring systems, etc., with little consideration for the status perception of power distribution equipment.

[0006] In view of the above-mentioned problems existing in the prior art, this utility model is proposed. Utility Model Content

[0007] To overcome the shortcomings of existing technologies, this utility model provides a digital intelligent system for realizing a true medium- and low-voltage distribution network. The technical solution of this utility model is as follows:

[0008] A digital intelligent system for realizing a true medium- and low-voltage distribution network, including

[0009] Substation units are used to realize the main power transformation of the distribution network;

[0010] Network frame units are used to construct transmission paths in a power distribution network;

[0011] A load unit is used to connect electrical equipment.

[0012] The fault simulation unit is used to simulate single-phase grounding faults, short-circuit faults, and open-circuit faults in the distribution network.

[0013] The defect simulation unit is used to simulate the temperature rise and partial discharge defects of primary power distribution equipment.

[0014] A distribution automation master station or monitoring system is used to monitor and manage the distribution network.

[0015] Status sensing sensors are used to collect electrical and status information of the power distribution network.

[0016] The substation unit includes:

[0017] Main transformer, used for voltage transformation; busbar, used to connect the main transformer and outgoing switches;

[0018] Outgoing line switches are used to control and protect circuits; neutral point complete sets of equipment are used to realize grounding methods such as ungrounded distribution network, grounded arc suppression coil, low resistance grounding, and resistance grounding in parallel arc suppression coils.

[0019] The grid unit includes: an overhead line for transmitting power in space above ground, reducing the impact of ground obstacles and facilitating maintenance and monitoring. The overhead line consists of an overhead conductor and a primary and secondary integrated pole-mounted switch. The overhead conductor is responsible for power transmission, and the primary and secondary integrated pole-mounted switch is used for line control and protection.

[0020] Cable lines are used for power transmission in urban environments, underground passages, or areas where overhead lines are not suitable. They consist of buried cables and primary and secondary integrated ring network boxes. The buried cables are responsible for transmitting power in the enclosed environment, while the primary and secondary integrated ring network boxes are used for the connection, control, and protection of the cable lines.

[0021] A hybrid overhead cable line is used to combine overhead lines and cable lines. It consists of overhead conductors, underground cables, and corresponding primary and secondary integrated pole-mounted switches and ring main units.

[0022] The primary and secondary fusion column switch includes:

[0023] Pole-mounted switches are used to control and protect power distribution lines; a first voltage sensor is used to measure voltage; a first current sensor is used to measure current; a first temperature sensor is used to monitor equipment temperature; a first partial discharge sensor is used to monitor partial discharge; and a feeder terminal unit (FTU) is used for data acquisition and execution of control commands. Electrical quantities consisting of voltage and current, as well as status quantities consisting of temperature and partial discharge information, are collected at the feeder terminal unit (FTU), which then transmits the data to the power distribution automation master station or monitoring system via a transmission unit.

[0024] The primary and secondary integrated ring network box includes:

[0025] The ring main unit is used to connect and control the power distribution network; the substation terminal unit (DTU) is used for data acquisition and execution of control commands; the second voltage transformer is used to measure voltage; the second current sensor is used to measure current; the second temperature sensor is used to monitor equipment temperature; and the second partial discharge sensor is used to monitor partial discharge. The electrical quantities composed of voltage and current information and the status quantities composed of temperature and partial discharge information are collected at the substation terminal unit (DTU), and then the substation terminal unit transmits the data to the power distribution automation master station or monitoring system through the transmission unit.

[0026] The load component includes: a distribution transformer for transforming and distributing electrical energy; and electrical loads, including electrical equipment. The distribution transformer, through holographic sensing of electrical quantities and status quantities, collects the sensed electrical quantities and status quantities to an intelligent fusion terminal, which then transmits the data to the power distribution automation master station or monitoring system via a transmission unit.

[0027] The power distribution automation master station or monitoring system is used to realize the holographic perception of electrical quantities and status quantities of the power distribution network, fault analysis, fault isolation, power restoration and transfer, as well as proactive early warning analysis and judgment of operating conditions.

[0028] The advantages of this utility model are: it guides the construction of digital and intelligent full-scale test sites, as well as the digital and intelligent upgrading of existing full-scale test sites, realizes the installation of state perception sensors, data transmission, and the fusion of physical information with electrical components, thereby achieving holographic perception and proactive early warning of operating conditions of the power distribution network, and guiding the digital and intelligent construction of the power distribution network. Attached Figure Description

[0029] Figure 1 This is a flowchart illustrating the method of this utility model.

[0030] Figure 2 This is a structural block diagram of the system of this utility model. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0032] See Figure 1 and Figure 2This utility model relates to a digital intelligent system for realizing a true medium- and low-voltage distribution network, comprising:

[0033] Substation units are used to realize the main power transformation of the distribution network;

[0034] Network frame units are used to construct transmission paths in a power distribution network;

[0035] A load unit is used to connect electrical equipment.

[0036] The fault simulation unit is used to simulate single-phase grounding faults, short-circuit faults, and open-circuit faults in the distribution network.

[0037] The defect simulation unit is used to simulate the temperature rise and partial discharge defects of primary power distribution equipment.

[0038] A distribution automation master station or monitoring system is used to monitor and manage the distribution network.

[0039] Status sensing sensors are used to collect electrical and status information of the power distribution network.

[0040] The above structural composition achieves:

[0041] High integration: By integrating substation units, grid units, load units, fault simulation units, defect simulation units, distribution automation master stations or monitoring systems, and status sensing sensors, comprehensive digital and intelligent management of the distribution network is achieved.

[0042] Fault simulation capability: The fault simulation unit can simulate single-phase grounding faults, short-circuit faults, and open-circuit faults, which helps to prevent and practice before actual faults occur, and improves the reliability and safety of the system.

[0043] Defect simulation capability: The defect simulation unit can simulate the temperature rise and partial discharge defects of primary power distribution equipment, which helps to detect and deal with potential equipment problems in advance and reduce unexpected downtime.

[0044] Real-time monitoring and data collection: Status sensing sensors can collect electrical and status information of the power distribution network in real time, providing accurate data support for the power distribution automation master station or monitoring system.

[0045] The substation unit includes:

[0046] Main transformer, used for voltage transformation; busbar, used to connect the main transformer and outgoing switches;

[0047] Outgoing line switches are used to control and protect circuits; neutral point complete sets of equipment are used to realize grounding methods such as ungrounded distribution network, grounded arc suppression coil, low resistance grounding, and resistance grounding in parallel arc suppression coils.

[0048] The substation's internal units have achieved the following:

[0049] Efficient voltage conversion: The main transformer is responsible for converting the voltage to a level suitable for the power distribution network, ensuring efficient power transmission.

[0050] Flexible circuit connections: As a key component connecting the main transformer and outgoing switches, the busbar allows for flexible circuit configuration and expansion.

[0051] Reliable circuit control and protection: Outgoing line switches provide circuit control and protection, and can quickly disconnect or switch the circuit in case of fault or maintenance, improving the safety and reliability of the system.

[0052] The space frame unit includes:

[0053] Overhead lines are used to transmit electricity in space above the ground, reducing the impact of ground obstacles and facilitating maintenance and monitoring. The overhead line consists of overhead conductors and primary and secondary integrated pole-mounted switches. The overhead conductors are responsible for power transmission, while the primary and secondary integrated pole-mounted switches are used for line control and protection.

[0054] Cable lines are used for power transmission in urban environments, underground passages, or areas where overhead lines are not suitable. They consist of buried cables and primary and secondary integrated ring network boxes. The buried cables are responsible for transmitting power in the enclosed environment, while the primary and secondary integrated ring network boxes are used for the connection, control, and protection of the cable lines.

[0055] The overhead cable hybrid line is used to combine overhead lines and cable lines to adapt to different geographical and environmental conditions. It combines the ease of installation and maintenance of overhead lines with the concealment and anti-interference of cable lines. It consists of overhead conductors, underground cables, and corresponding primary and secondary integrated pole-mounted switches and ring main units.

[0056] This space frame unit achieves:

[0057] Optimized power transmission paths: The combination of overhead lines and cable lines provides flexible power transmission paths, allowing the selection of the most suitable transmission method based on geographical and environmental conditions.

[0058] Reduce the impact of ground obstacles: Overhead lines place power facilities in the air, reducing the impact of ground obstacles and improving the efficiency of power transmission.

[0059] Easy to maintain and monitor: Overhead lines are easy to observe and maintain, and problems can be detected and dealt with in a timely manner.

[0060] Integrated control and protection: The primary and secondary integrated pole-mounted switches and ring main units integrate the control and protection functions of the line, improving the level of automation and response speed.

[0061] High adaptability: The design of the overhead cable hybrid line enables the system to adapt to different geographical and environmental conditions, ensuring effective power transmission in both urban environments and underground tunnels.

[0062] Concealment and interference resistance: Cable lines offer concealment and interference resistance, making them suitable for use in areas where overhead lines are not feasible, such as city centers or underground passages.

[0063] The primary and secondary fusion column switch includes:

[0064] Pole-mounted switches are used to control and protect power distribution lines; a first voltage sensor is used to measure voltage; a first current sensor is used to measure current; a first temperature sensor is used to monitor equipment temperature; a first partial discharge sensor is used to monitor partial discharge; and a feeder terminal unit (FTU) is used for data acquisition and execution of control commands. Electrical quantities consisting of voltage and current, as well as status quantities consisting of temperature and partial discharge information, are collected at the feeder terminal unit (FTU), which then transmits the data to the power distribution automation master station or monitoring system via a transmission unit (4G, 5G, network cable, fiber optic, etc.).

[0065] This primary and secondary fusion column switch achieves:

[0066] Integrated control and protection: Pole-mounted switches integrate control and protection functions, enabling rapid response when power distribution lines experience faults, thus improving system safety and reliability.

[0067] Comprehensive electrical quantity measurement: The first voltage sensor and the first current sensor provide real-time measurement of voltage and current in the distribution lines, which helps to monitor power quality and system performance.

[0068] Equipment status monitoring: The first temperature sensor and the first partial discharge sensor monitor the temperature and partial discharge status of the equipment, which helps to prevent equipment overheating and insulation failure.

[0069] Data Acquisition and Execution: The feeder terminal unit (FTU) is responsible for data acquisition and execution of control commands. It is a key device connecting sensors and power distribution automation master stations or monitoring systems.

[0070] Real-time data transmission: Through the transmission unit (such as 4G, 5G, network cable, fiber optic and other communication methods), the FTU can transmit the collected data to the distribution automation master station or monitoring system in real time.

[0071] The primary and secondary integrated ring network box includes:

[0072] The ring main unit is used to connect and control the power distribution network; the substation terminal unit (DTU) is used for data acquisition and execution of control commands; the second voltage transformer is used to measure voltage; the second current sensor is used to measure current; the second temperature sensor is used to monitor equipment temperature; and the second partial discharge sensor is used to monitor partial discharge. The electrical quantities composed of voltage and current information and the status quantities composed of temperature and partial discharge information are collected at the substation terminal unit (DTU), and then the substation terminal unit transmits the data to the power distribution automation master station or monitoring system through the transmission unit.

[0073] This integrated primary and secondary ring network box achieves:

[0074] Integrated design: The ring main unit integrates connection, control, protection and monitoring functions, improving the automation level of the distribution network.

[0075] Comprehensive monitoring capabilities: The second voltage transformer and the second current sensor provide real-time measurements of voltage and current, which helps monitor power quality and system performance.

[0076] The second temperature sensor and the second partial discharge sensor monitor the temperature and partial discharge status of the equipment, helping to prevent overheating and insulation failure.

[0077] Data Acquisition and Execution: The DTU (Digital Unit) at the station is responsible for data acquisition and execution of control commands. It is a key device connecting sensors and the power distribution automation master station or monitoring system.

[0078] Real-time data transmission: The DTU transmits data to the distribution automation master station or monitoring system in real time through transmission units (such as 4G, 5G, network cable, fiber optic and other communication methods) to ensure the real-time performance and accuracy of the data.

[0079] Improving power supply reliability: Real-time monitoring and rapid response help reduce power outage time and improve power supply reliability.

[0080] The load component includes: a distribution transformer for transforming and distributing electrical energy; and electrical loads, including electrical equipment. The distribution transformer, through holographic sensing of electrical quantities and status quantities, collects the sensed electrical quantities and status quantities to an intelligent fusion terminal, which then transmits the data to the power distribution automation master station or monitoring system via a transmission unit.

[0081] This load component achieves:

[0082] Efficient power conversion: Distribution transformers are responsible for converting voltage to a level suitable for end users and distributing electrical energy to ensure the efficient use of electrical energy.

[0083] Diverse electrical equipment access: The load section can connect to various types of electrical equipment to meet the needs of different users.

[0084] Holographic sensing capability: Through holographic sensing of electrical quantities and state quantities, distribution transformers can comprehensively monitor and manage power flow and equipment status.

[0085] Data integration and transmission: The intelligent fusion terminal integrates the electrical and status information sensed by the distribution transformer and sends it to the distribution automation master station or monitoring system through the transmission unit.

[0086] The power distribution automation master station or monitoring system is used to realize the holographic perception of electrical quantities and status quantities of the power distribution network, fault analysis, fault isolation, power restoration and transfer, as well as proactive early warning analysis and judgment of operating conditions.

[0087] The working principle of this utility model is as follows:

[0088] (1) Voltage conversion and circuit control:

[0089] The substation units first perform voltage conversion, adjusting the voltage to the distribution network level through the main transformer;

[0090] The busbar connects the output of the main transformer to the outgoing switch to facilitate power distribution;

[0091] Outgoing line switches are responsible for controlling and protecting circuits to ensure the safe operation of the power system under various conditions;

[0092] Neutral point systems offer different grounding methods to meet varying system stability and safety requirements;

[0093] (2) Constructing the transmission path:

[0094] The network frame unit is responsible for constructing the transmission path of the distribution network;

[0095] Overhead lines transmit power in the space above ground through overhead conductors and primary and secondary integrated pole-mounted switches, reducing the impact of ground obstacles and facilitating maintenance and monitoring;

[0096] Cable lines transmit power in urban environments, underground passages, or areas where overhead lines are not suitable, through underground cables and integrated primary and secondary ring network boxes.

[0097] Hybrid overhead cable lines combine the characteristics of overhead lines and cable lines, making them adaptable to different geographical and environmental conditions;

[0098] (3) Connecting electrical equipment:

[0099] Load units are connected to electrical equipment, including various types of electrical loads;

[0100] Distribution transformers are responsible for transforming and distributing electrical energy within load units;

[0101] (4) Data collection:

[0102] Status sensing sensors are installed in grid units and load units to collect electrical and status information of the distribution network;

[0103] (5) Data transmission: The feeder terminal unit (FTU) and station terminal unit (DTU) in the primary and secondary integrated pole-mounted switch and the primary and secondary integrated ring network box are responsible for data acquisition and execution of control commands; and send the collected data to the distribution automation master station or monitoring system through the transmission unit;

[0104] (6) Data analysis and decision-making:

[0105] The distribution automation master station or monitoring system receives data from smart terminals, performs holographic perception of the data, and analyzes the operating status of the distribution network;

[0106] The power distribution automation master station or monitoring system performs fault analysis to identify and locate faults in the system; when a fault occurs, it performs fault isolation to prevent the fault from spreading to other areas.

[0107] The power distribution automation master station or monitoring system performs proactive early warning analysis and judgment of operating conditions, actively monitors the system status, and provides early warning of possible faults or abnormalities.

[0108] In summary, this utility model proposes a method for realizing the digitalization and intelligentization of a medium- and low-voltage true-type distribution network. It can guide the construction of a digital and intelligent true-type test site and the digital and intelligent upgrading of existing true-type test sites, realize the installation and data transmission of various status sensing sensors, and the physical-information fusion with the electrical components, thereby achieving holographic perception and proactive early warning of operating conditions of the distribution network, and guiding the digitalization and intelligentization of the distribution network.

[0109] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A digital intelligent system for realizing a true medium- and low-voltage distribution network, characterized in that, include Substation units are used to realize the main power transformation of the distribution network; Network frame units are used to construct transmission paths in a power distribution network; A load unit is used to connect electrical equipment. The fault simulation unit is used to simulate single-phase grounding faults, short-circuit faults, and open-circuit faults in the distribution network. The defect simulation unit is used to simulate the temperature rise and partial discharge defects of primary power distribution equipment. A distribution automation master station or monitoring system is used to monitor and manage the distribution network. Status sensing sensors are used to collect electrical and status information of the power distribution network.

2. The digital intelligent system for realizing a true medium- and low-voltage distribution network according to claim 1, characterized in that, The substation unit includes: Main transformer, used for voltage transformation; Busbars are used to connect the main transformer and outgoing switches; Outgoing line switch, used to control and protect circuits; Neutral point complete set of equipment is used to realize the grounding methods of ungrounded distribution network, grounded arc suppression coil, low resistance grounding, and parallel resistance grounding of arc suppression coil.

3. The digital intelligent system for realizing a true medium- and low-voltage distribution network according to claim 1 or 2, characterized in that, The space frame unit includes: Overhead lines are used to transmit electricity in space above the ground, reducing the impact of ground obstacles and facilitating maintenance and monitoring. The overhead line consists of overhead conductors and primary and secondary integrated pole-mounted switches. The overhead conductors are responsible for power transmission, while the primary and secondary integrated pole-mounted switches are used for line control and protection. Cable lines are used for power transmission in urban environments, underground passages, or areas where overhead lines are not suitable. They consist of buried cables and primary and secondary integrated ring network boxes. The buried cables are responsible for transmitting power in the enclosed environment, while the primary and secondary integrated ring network boxes are used for the connection, control, and protection of the cable lines. A hybrid overhead cable line is used to combine overhead lines and cable lines. It consists of overhead conductors, underground cables, and corresponding primary and secondary integrated pole-mounted switches and ring main units.

4. The digital intelligent system for realizing a true medium- and low-voltage distribution network according to claim 3, characterized in that, The primary and secondary fusion column switch includes: Pole-mounted switches are used to control and protect power distribution lines; a first voltage sensor is used to measure voltage; a first current sensor is used to measure current; a first temperature sensor is used to monitor equipment temperature; a first partial discharge sensor is used to monitor partial discharge; and a feeder terminal unit (FTU) is used for data acquisition and execution of control commands. Electrical quantities consisting of voltage and current, as well as status quantities consisting of temperature and partial discharge information, are collected at the feeder terminal unit (FTU), which then transmits the data to the power distribution automation master station or monitoring system via a transmission unit.

5. The digital intelligent system for realizing a true medium- and low-voltage distribution network according to claim 4, characterized in that, The primary and secondary integrated ring network box includes: The ring main unit is used to connect and control the power distribution network; the substation terminal unit (DTU) is used for data acquisition and execution of control commands; the second voltage transformer is used to measure voltage; the second current sensor is used to measure current; the second temperature sensor is used to monitor equipment temperature; and the second partial discharge sensor is used to monitor partial discharge. The electrical quantities composed of voltage and current information and the status quantities composed of temperature and partial discharge information are collected at the substation terminal unit (DTU), and then the substation terminal unit transmits the data to the power distribution automation master station or monitoring system through the transmission unit.

6. The digital intelligent system for realizing a true medium- and low-voltage distribution network according to claim 5, characterized in that, The load component includes: A distribution transformer is used to transform and distribute electrical energy; electrical loads include electrical equipment; the distribution transformer, through holographic perception of electrical quantities and status quantities, collects the perceived electrical quantities and status quantities to an intelligent fusion terminal, and then the intelligent fusion terminal transmits the data to the distribution automation master station or monitoring system through a transmission unit.

7. The digital intelligent system for realizing a true medium- and low-voltage distribution network according to claim 5, characterized in that, The power distribution automation master station or monitoring system is used to realize the holographic perception of electrical quantities and status quantities of the power distribution network, fault analysis, fault isolation, power restoration and transfer, as well as proactive early warning analysis and judgment of operating conditions.

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