CN112994247A - Branch identification system and method for 10kV medium-voltage line - Google Patents
Branch identification system and method for 10kV medium-voltage line Download PDFInfo
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- CN112994247A CN112994247A CN202110366366.0A CN202110366366A CN112994247A CN 112994247 A CN112994247 A CN 112994247A CN 202110366366 A CN202110366366 A CN 202110366366A CN 112994247 A CN112994247 A CN 112994247A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
Abstract
The invention discloses a branch identification system and method for a 10kV medium-voltage line, and mainly relates to the field of distribution automation. The system comprises an identification module, a full electric quantity acquisition module, a line loss calculation module, a fault study and judgment module and an expansion module, wherein the identification module is used for identifying the branch and line-to-station topological relation of a medium-voltage distribution network, the identification module comprises a signal generation device and a signal detection device, the full electric quantity acquisition module is used for full electric quantity acquisition of the system, the line loss calculation module is used for line loss calculation of the system, the fault study and judgment module is used for fault study and judgment of the system, and the expansion module is used for function expansion of the system. The invention has the beneficial effects that: the characteristics that a power frequency distortion modulation signal can be coupled to a medium-voltage side across a transformer for remote transmission and is only transmitted on a line where a distribution transformer is located are utilized, and power line communication is combined, so that automatic identification of the topological connection relation between the distribution transformer and a 10kV line is realized, and a clear and complete medium-voltage distribution network is constructed.
Description
Technical Field
The invention relates to the field of distribution automation, in particular to a branch identification system and method for a 10kV medium-voltage line.
Background
The power distribution network topology is a complete description of power distribution network equipment, lines and connection relations, is an important basis for realizing intelligent application of the power distribution network, and the complete, consistent, accurate, timely and reliable line-pressing transformation relations and related data in the power distribution network can provide key support for dispatching operation, maintenance and power supply service promotion of the power distribution network, so that intelligent application such as active first-aid repair of the power distribution network is realized.
At present, the topology identification technology of the power distribution network mainly focuses on the application of low-voltage subscriber-transformer correspondence and the application of line-transformer identification, and lacks the application of the topology relation of the whole medium-voltage line, especially the application of the identification relation of the medium-voltage branch line.
The power distribution network is large in scale, large in equipment quantity, complex in structure, numerous in lines and connected transformers, and large in workload, low in working efficiency and poor in model information intuition if a power distribution network topology model is manually maintained, the integrity and correctness of the power distribution network topology model are difficult to guarantee, and a series of problems that the power distribution network topology model is low in quality, incomplete in topology relation, disordered in connection, incapable of sensing model changes, incapable of guaranteeing consistency and the like exist.
By combining the characteristics that the power frequency distortion modulation signal can be coupled to a medium-voltage side for remote transmission across a transformer and is only transmitted on a line where the distribution transformer is located, the automatic identification of the topological connection relation between the distribution transformer and the 10kV line is realized by combining the power line communication, a clear and complete medium-voltage distribution network is constructed, and meanwhile, technical and data support is provided for line loss calculation and fault judgment.
Disclosure of Invention
The invention aims to provide a branch recognition system and a branch recognition method for a 10kV medium-voltage line, which utilize the characteristics that a power frequency distortion modulation signal can be coupled to a medium-voltage side for remote transmission across a transformer and is only transmitted on a line where a distribution transformer is positioned, and combine with power line communication, realize the automatic recognition of the topological connection relation between the distribution transformer and the 10kV line, construct a clear and complete medium-voltage distribution network, and simultaneously provide technology and data support for line loss calculation and fault judgment; effectively solves the problems existing in the background technology.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the branch identification system of the 10kV medium-voltage line comprises an identification module, a full electric quantity acquisition module, a line loss calculation module, a fault study and judgment module and an expansion module, wherein the identification module is used for identifying the topological relation of branches and line-transformer-stations of a medium-voltage distribution network, the identification module comprises a signal generation device and a signal detection device, the full electric quantity acquisition module is used for full electric quantity acquisition of the system, the line loss calculation module is used for line loss calculation of the system, the fault study and judgment module is used for fault study and judgment of the system, and the expansion module is used for functional expansion of the system.
The signal generating device is used for sending a power frequency distortion modulation signal, the signal generating device comprises a power frequency distortion modulation signal transmitting circuit, the signal detecting device is used for detecting the power frequency distortion modulation signal sent by the signal transmitting device, and the signal detecting device comprises a power frequency distortion modulation signal identifying circuit.
The signal generating device is arranged on the low-voltage side of the distribution transformer, and the signal monitoring device is arranged on the high-voltage side of the distribution transformer, a main line node and each branch node of the distribution network line.
The full electric quantity acquisition module comprises a full electric quantity acquisition/modulation circuit, and the expansion module comprises an electricity stealing monitoring unit, an electric meter calibration unit and a mutual inductor calibration unit.
A branch identification method of a 10kV medium-voltage line comprises the following steps:
step (1.1): a distribution transformer, a medium-voltage line, a signal generating device and a signal detecting device are connected;
step (1.2): the signal generating device transmits a power frequency distortion modulation signal;
step (1.3): processing the power frequency distortion modulation signal transmitted by the signal generating device;
step (1.4): the signal detection device monitors a power frequency distortion modulation signal.
And (3) in the step (1.1), the signal generating device is arranged on the low-voltage side of the distribution transformer, and the signal monitoring device is arranged on the high-voltage side of the distribution transformer, the main line node of the distribution network line and each branch node.
In the step (1.2), the signal generating device transmits a power frequency distortion modulation signal specific to a transformer in the power distribution network, the power frequency distortion modulation signal transmitting circuit adopts a bidirectional thyristor, the bidirectional thyristor can be instantly switched on about 30 degrees before the zero crossing point of the power frequency voltage from positive to negative or from negative to positive, an instant peak current i is generated on the modulation inductor and is superposed on the load current, so that the load current generates micro distortion, and when the instant current value is zero, the thyristor is switched off, and primary power frequency distortion modulation signal modulation is completed.
In the step (1.3), a filter is used for filtering noise and interference, only signals in a specific frequency range are allowed to pass, the peak value of the filtered signals is further enhanced and smoothed to enhance the strength and detectability of power frequency distortion signals, and absolute values of the enhanced and smoothed signals are further subjected to A/D conversion.
And (4) if the signal monitoring device can receive the power frequency distortion modulation signal sent by the signal generating device at the low-voltage side of the transformer in the step (1.4), indicating that the transformer belongs to the line where the signal monitoring device is located. Similarly, if the signal monitoring device at the branch can receive the power frequency distortion modulation signal sent by the signal generating device at the low-voltage side of the transformer, it indicates that the branch line belongs to the line where the signal monitoring device is located.
Compared with the prior art, the invention has the beneficial effects that:
1. the identification of the line transformation relation of the medium-voltage distribution network and the automatic detection, analysis and generation of the medium-voltage distribution network are supported;
2. automatically identifying the topological connection relation between the distribution transformer and the 10kV line;
3. clear and complete medium voltage station-line-variable-branch relation and distribution network topology are dynamically constructed;
4. the system can support the omnibearing integrated identification of the medium-voltage distribution network site-line-variable-branch relation and the medium-voltage distribution network topological structure;
5. a solid foundation is laid for establishing a new mode of mutual identification and object connection of medium-voltage distribution network equipment;
6. meanwhile, technical and data support is provided for line loss calculation and fault judgment.
Drawings
Fig. 1 is a functional architecture diagram of a medium voltage line identification system of the present invention.
Fig. 2 is a schematic diagram of a medium voltage line identification system hardware architecture according to the present invention.
FIG. 3 is a schematic diagram of the process of power frequency distortion modulation signal processing and characteristic current identification.
Fig. 4 is a schematic diagram of a branch circuit of the present invention.
Fig. 5 is a schematic diagram of the construction of the line-to-branch identification scheme of the medium-voltage line station.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
The invention relates to a branch identification system of a 10kV medium-voltage line, which comprises an identification module, an all-electric quantity acquisition module, a line loss calculation module, a fault study and judgment module and an expansion module as shown in figure 1, wherein the identification module is used for identifying the branch and line-to-substation topological relation of a medium-voltage distribution network, the identification module comprises a signal generation device and a signal detection device, the all-electric quantity acquisition module is used for acquiring the all electric quantity of the system, the line loss calculation module is used for calculating the line loss of the system, the fault study and judgment module is used for studying and judging the fault of the system, and the expansion module is used for expanding the function of the system.
Further, as shown in fig. 2, the signal generating device is configured to send a power frequency distortion modulation signal, the signal generating device includes a power frequency distortion modulation signal transmitting circuit, the signal detecting device is configured to detect the power frequency distortion modulation signal sent by the signal transmitting device, and the signal detecting device includes a power frequency distortion modulation signal identifying circuit.
Further, as shown in fig. 4, the signal generating device is installed on the low-voltage side of the distribution transformer, and the signal monitoring device is installed on the high-voltage side of the distribution transformer, the main line node of the distribution network line and each branch node.
Further, as shown in fig. 2, the full electric quantity acquisition module includes a full electric quantity acquisition/modulation circuit, and as shown in fig. 1, the expansion module includes an electricity stealing monitoring unit, an electric meter calibration unit, and a transformer calibration unit.
A branch identification method of a 10kV medium-voltage line comprises the following steps:
step (1.1): a distribution transformer, a medium-voltage line, a signal generating device and a signal detecting device are connected;
step (1.2): the signal generating device transmits a power frequency distortion modulation signal;
step (1.3): processing the power frequency distortion modulation signal transmitted by the signal generating device;
step (1.4): the signal detection device monitors a power frequency distortion modulation signal.
Preferably, in step (1.1), the signal generating device is installed at the low-voltage side of the distribution transformer, and the signal monitoring device is installed at the high-voltage side of the distribution transformer, the main line node of the distribution network line and each branch node.
Preferably, in the step (1.2), the signal generating device transmits a power frequency distortion modulation signal specific to a transformer in the power distribution network, the power frequency distortion modulation signal transmitting circuit adopts a bidirectional thyristor, and can be instantly switched on about 30 degrees before a zero crossing point of a power frequency voltage from positive to negative or from negative to positive, an instant peak current i is generated on a modulation inductor and is superposed on a load current, so that the load current generates a micro distortion, and when an instant current value is zero, the thyristor is switched off, and primary power frequency distortion modulation signal modulation is completed.
Preferably, in step (1.3), a filter is used to filter noise and interference, only signals in a specific frequency range are allowed to pass, the peak value of the filtered signal is further enhanced and smoothed to enhance the strength and detectability of the power frequency distortion signal, and the absolute value of the enhanced and smoothed signal is further taken and a/D converted.
As shown in fig. 3, in the process of detecting the power frequency distortion modulated signal, the filter filters noise and interference, and only allows signals in a specific frequency range to pass through, the signal amplification circuit is configured to enhance and smooth the peak value of the filtered signal, so as to enhance the strength and detectability of the power frequency distortion signal, the signal absolute value unit is configured to take an absolute value of the enhanced and smoothed signal, the signal peak value detection unit is configured to detect the peak value of the received signal, and the a/D conversion unit is configured to detect the power frequency distortion modulated signal contained in the received signal.
Preferably, as shown in fig. 4 and 5, in step (1.4), if the signal monitoring device can receive the power frequency distortion modulation signal sent by the signal generating device on the low-voltage side of the transformer, it is described that the transformer belongs to the line where the signal monitoring device is located. Similarly, if the signal monitoring device at the branch can receive the power frequency distortion modulation signal sent by the signal generating device at the low-voltage side of the transformer, it indicates that the branch line belongs to the line where the signal monitoring device is located.
As shown in fig. 4 and 5, a characteristic current is emitted to a branch device at a 400V position on the low-voltage side of the transformer, the line electrical parameter data below the branch is detected, and the line loss analysis is performed by using a local analysis technology to assist the branch device;
receiving the characteristic current of equipment at 400V at a branch, monitoring accessory equipment by means of the equipment at the branch and medium-voltage line current through an LoRa wireless technology, so that power line loss is monitored, and transmitting topology association information of the branch equipment and the equipment at 400V to a master station through wireless equipment such as 4G;
at 10kV department generating line, through loRa wireless technology, rely on branch department equipment and medium voltage line current monitoring accessory equipment to realize monitoring power line consume, send branch equipment and 400V side equipment topology association information to main website through wireless devices such as 4G.
Claims (9)
1. The branch identification system of the 10kV medium-voltage line is characterized by comprising an identification module, a full electric quantity acquisition module, a line loss calculation module, a fault study and judgment module and an expansion module, wherein the identification module is used for identifying the branch and line-to-line topological relation of a medium-voltage distribution network, the identification module comprises a signal generation device and a signal detection device, the full electric quantity acquisition module is used for full electric quantity acquisition of the system, the line loss calculation module is used for line loss calculation of the system, the fault study and judgment module is used for fault study and judgment of the system, and the expansion module is used for functional expansion of the system.
2. The branch identification system of a 10kV medium voltage line according to claim 1, wherein the signal generating device is configured to send out a power frequency distortion modulation signal, the signal generating device comprises a power frequency distortion modulation signal transmitting circuit, the signal detecting device is configured to detect the power frequency distortion modulation signal sent out by the signal transmitting device, and the signal detecting device comprises a power frequency distortion modulation signal identifying circuit.
3. The branch identification system of 10kV medium-voltage line according to claim 1, wherein the signal generating device is installed at the low-voltage side of the distribution transformer, and the signal monitoring device is installed at the high-voltage side of the distribution transformer, the trunk line node and each branch node of the distribution network line.
4. The branch identification system of 10kV medium-voltage line according to claim 1, wherein the full-power collection module comprises a full-power collection/modulation circuit, and the expansion module comprises a power stealing monitoring unit, an electric meter verification unit and a mutual inductor verification unit.
5. The branch identification method of a 10kV medium voltage line according to any one of claims 1 to 4, characterized by comprising the steps of:
step (1.1): a distribution transformer, a medium-voltage line, a signal generating device and a signal detecting device are connected;
step (1.2): the signal generating device transmits a power frequency distortion modulation signal;
step (1.3): processing the power frequency distortion modulation signal transmitted by the signal generating device;
step (1.4): the signal detection device monitors a power frequency distortion modulation signal.
6. The method for identifying branches of a 10kV medium-voltage line according to claim 5, wherein in the step (1.1), the signal generating device is installed on the low-voltage side of the distribution transformer, and the signal monitoring device is installed on the high-voltage side of the distribution transformer, the main line node of the distribution network line and each branch node.
7. The branch identification method for the 10kV medium-voltage line according to claim 5, wherein in the step (1.2), the signal generation device transmits a power frequency distortion modulation signal specific to a transformer in the power distribution network, the power frequency distortion modulation signal transmission circuit adopts a bidirectional thyristor, the bidirectional thyristor can be instantly switched on about 30 degrees before a zero crossing point of power frequency voltage from positive to negative or from negative to positive, an instant peak current i generated on a modulation inductor is superposed on a load current, so that the load current generates slight distortion, and when the instant current value is zero, the thyristor is switched off, and primary power frequency distortion modulation signal modulation is completed.
8. The method according to claim 5, wherein in step (1.3), the filter is used to filter noise and interference, only signals in a specific frequency range are allowed to pass through, the peak value of the filtered signal is further enhanced and smoothed to enhance the strength and detectability of the power frequency distortion signal, and the absolute value of the enhanced and smoothed signal is further subjected to A/D conversion.
9. The method according to claim 5, wherein in step (1.4), if the signal monitoring device can receive the power frequency distortion modulation signal sent by the signal generating device on the low voltage side of the transformer, it indicates that the transformer belongs to the line on which the signal monitoring device is located. Similarly, if the signal monitoring device at the branch can receive the power frequency distortion modulation signal sent by the signal generating device at the low-voltage side of the transformer, it indicates that the branch line belongs to the line where the signal monitoring device is located.
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| CN202110366366.0A CN112994247A (en) | 2021-04-06 | 2021-04-06 | Branch identification system and method for 10kV medium-voltage line |
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| CN202110366366.0A CN112994247A (en) | 2021-04-06 | 2021-04-06 | Branch identification system and method for 10kV medium-voltage line |
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Cited By (1)
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