CN112364495B - Main station centralized feeder automation simulation platform - Google Patents
Main station centralized feeder automation simulation platform Download PDFInfo
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- CN112364495B CN112364495B CN202011198543.0A CN202011198543A CN112364495B CN 112364495 B CN112364495 B CN 112364495B CN 202011198543 A CN202011198543 A CN 202011198543A CN 112364495 B CN112364495 B CN 112364495B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
Abstract
The application discloses a centralized feeder automation simulation platform of a master station, which comprises: the master station comprises a master station system, a distribution network dispatching automation master station system, a first pre-switch and a second pre-switch, wherein the master station system and the distribution network dispatching automation master station system are connected with each other, the first pre-switch is connected with the master station system, and the second pre-switch is connected with the distribution network dispatching automation master station system; the factory station comprises a plurality of substation remote terminal units connected with the first pre-exchange, a background exchange connected with each substation remote terminal unit, a plurality of line protection measurement and control devices connected with the background exchange and respectively corresponding to each substation remote terminal unit one by one, and a plurality of ring main unit data transmission units connected with the second pre-exchange; each line protection measurement and control device and the ring main unit data transmission unit are respectively connected to a corresponding analog circuit breaker. The application can realize low simulation cost and high safety, and has no power failure difficulty and difficult matching test at each ring main unit.
Description
Technical Field
The application relates to the field of power simulation, in particular to a centralized feeder automation simulation platform of a master station.
Background
Each control strategy derived from the various parameters and systems required for the feeder automation function would present difficulties if it were to be physically geared to the distribution network operating equipment: first, urban distribution network users have difficulty in power failure. Secondly, the test sites are distributed at all ring main units in the urban area, the cooperation test is difficult, thirdly, the simulation safety is poor, and the simulation cost is high.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the problems occurring in the prior art.
Therefore, one of the purposes of the application is to provide a master station centralized feeder automation simulation platform which can realize low simulation cost and high safety, and has no power failure difficulty and difficult matching test at each ring main unit so as to solve the problems in the prior art.
In order to solve the technical problems, the application provides the following technical scheme: a master station centralized feeder automation simulation platform, comprising: the master station comprises a main network dispatching automation master station system and a distribution network dispatching automation master station system which are connected with each other, a first front-end switch connected with the main network dispatching automation master station system, and a second front-end switch connected with the distribution network dispatching automation master station system; the factory station comprises a plurality of substation remote terminal units connected with the first pre-exchange, a background exchange connected with each substation remote terminal unit, a plurality of line protection measurement and control devices connected with the background exchange and respectively corresponding to each substation remote terminal unit one by one, and a plurality of ring main unit data transmission units connected with the second pre-exchange; each line protection measurement and control device is respectively connected to a corresponding line simulation breaker, and each ring main unit data transmission unit is respectively connected to a corresponding ring main unit simulation breaker.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: each ring main unit simulation breaker is provided with four paths of distribution ports for connecting each branch of the ring main unit respectively, so that each branch of the ring main unit is provided with one path of ring main unit simulation breaker remote control.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: the method also comprises the steps of constructing three simulated substations L, M, N, wherein the three simulated substations L, M, N are respectively provided with a 10kV line L1, a 10kV line M1 and a 10kV line N1; the circuit simulation breaker is provided with three groups corresponding to three circuits L1, M1 and N1, namely a circuit L1 simulation breaker, a circuit M1 simulation breaker and a circuit N1 simulation breaker; the line protection and measurement and control devices corresponding to the three groups of line simulation circuit breakers respectively comprise a corresponding line L1 protection and measurement and control device, a line M1 protection and measurement and control device and a line N1 protection and measurement and control device; the transformer substation remote terminal units corresponding to the three groups of the line protection measurement and control devices respectively comprise corresponding line L1 remote terminal units, line M1 remote terminal units and line N1 remote terminal units; the main network dispatching automation main station system is connected to three groups of transformer substation remote terminal units through the first pre-switch.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: the three ring main units X, Y, Z are built, and the three ring main units X, Y, Z correspond to the four branches X1-X4, Y1-Y4 and Z1-Z4 respectively; the ring main unit simulation breaker is provided with three groups corresponding to three ring main units X, Y, Z, namely an X ring main unit simulation breaker, a Y ring main unit simulation breaker and a Z ring main unit simulation breaker; each ring main unit analog breaker is connected with four paths of branches X1-X4, Y1-Y4 and Z1-Z4 of each ring main unit X, Y, Z in a one-to-one correspondence manner through four paths of distribution ports on the ring main unit analog breaker; the ring main unit data transmission units corresponding to the three groups of ring main unit analog circuit breakers respectively comprise corresponding X ring main unit data remote transmission units, Y ring main unit data remote transmission units and Z ring main unit data remote transmission units; the distribution network dispatching automation master station system is connected to the three groups of ring main unit data transmission units through the second pre-switch.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: PCS9000 is adopted by the main network dispatching automation master station system and the distribution network dispatching automation master station system.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: the line protection measurement and control device is used for collecting line L1, M1 and N1 protection action information and transmitting the information to the remote terminal unit of the transformer substation; the remote terminal unit of the transformer substation is used for collecting deflection information of the circuit simulation breaker and uploading the deflection information and protection action information of the circuits L1, M1 and N1 from the circuit protection measurement and control device to the main network dispatching automation main station system; when the distribution network dispatching automation master station system needs to execute the power transmission restoration operation, a remote control command is forwarded from the distribution network dispatching automation master station system to the main network dispatching automation master station system, the main network dispatching automation master station system issues the operation command to three transformer substation remote terminal units, and the transformer substation remote terminal units issue the operation command to a line protection measurement and control device for export execution; the ring main unit data transmission unit is used for acquiring overcurrent alarm information of each branch of the ring main unit X, Y, Z and displacement information of the ring main unit simulated circuit breaker, and uploading the acquired data information to the distribution network dispatching automation master station system; when the distribution network dispatching automation master station system needs to execute fault isolation and power transmission recovery operation, a remote control command is issued from the distribution network dispatching automation master station system to the outlets of the three ring main unit data transmission units for execution; and the data information forwarding adopts a protocol.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: when the lines L1, M1 and N1 have permanent faults, the line protection measurement and control device controls the line to trip, the fault current is recovered within a set time, the line switch is switched on in a reclosing action, and if the fault current is detected again, the line is protected and tripped again, the line is represented to have permanent faults; the remote terminal unit of the transformer substation uploads the protection action information of the lines L1, M1 and N1 and the deflection information of the line simulation breaker generated in the process to the main network dispatching automation main station system and forwards the protection action information and the deflection information of the line simulation breaker to the distribution network dispatching automation main station system; the fault current flows through each branch of the ring main unit X, Y, Z, and if one branch of a certain ring main unit exceeds the current constant value and the time constant value of the overcurrent alarm, the ring main unit data transmission unit can upload the overcurrent alarm information of the corresponding branch of the ring main unit to the distribution network dispatching automation master station system; the distribution network dispatching automation master station system locates the position of fault occurrence according to the collected overcurrent alarm information, remote-control pulls open the ring main unit simulated circuit breaker nearest to the fault point to isolate the fault area, and then closes the circuit simulated circuit breaker or the ring main unit simulated circuit breaker through topology analysis and remote control operation to recover power supply of the non-fault area.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: four paths of distribution ports of the ring main unit simulation circuit breaker have the same structure, and binding posts are adopted; the binding post comprises a shell frame, a power receiving piece, a force transmitting piece and a screw, wherein the power receiving piece is arranged inside the shell frame, one end of the power receiving piece extends out of the shell frame, the force transmitting piece is arranged on the side edge of the power receiving piece, and the screw is connected to the side edge of the shell frame in a threaded fit manner and can push the force transmitting piece inwards; the shell frame is provided with a threading opening, and an electric wire can be threaded into the shell frame from the threading opening; the power receiving piece comprises a direction changing head, a connecting part fixed at the outer end of the direction changing head and a power receiving piece fixed at the outer end of the connecting part; the redirection head is provided with a notch facing the threading opening; the force transmission piece is arranged in the shell frame in a sliding way, and the sliding direction of the force transmission piece is perpendicular to the direction of the notch; the electric wire can extend into the edge of the notch after penetrating into the shell frame from the threading opening and reversely bends under the guiding of the contour of the notch to form a bending section; the screw can promote the biography power spare to can pass the inner of power spare extrusion electric wire, make it be close to the bending section and take place the evagination deformation in the turn department of both, utilize the turn department after the deformation will the bend head is pressed on the inside wall of casing frame.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: the binding post further comprises a limiting piece which is arranged opposite to the power receiving piece; the limiting piece is positioned at one corner part in the shell frame and comprises a first overhanging plate extending between the redirecting head and the shell frame interlayer and a second overhanging plate extending between the inner end of the electric wire and the bending section of the electric wire; one side of the second overhanging plate corresponding to the bending section is provided with a step surface opposite to the end head of the bending section.
As a preferable scheme of the master station centralized feeder automation simulation platform, the application comprises the following steps: the force transmission piece comprises a force receiving part and a pressing block fixed on the force receiving part; a compression groove opposite to the inner end of the screw is formed in the center of the stress part, a pair of accommodating grooves are symmetrically formed in two sides of the compression groove, a tension spring is respectively fixed in each accommodating groove, and the other end of the tension spring is fixed on the inner side wall of the shell frame; the extrusion block is opposite to the second extending plate, and flexible convex teeth are arranged at the tail ends of the extrusion block, and the tail ends of the flexible convex teeth face towards the notch of the redirection head.
The application has the beneficial effects that: compared with the prior art, the application has the following effects:
1. the application can realize the simulation of feeder automation by simulating the dispatching automation of the main network and the dispatching automation of the distribution network, is used for simulating the main line fault or the branch line fault under the typical main network distribution mode, realizes the automatic positioning, the automatic isolation and the automatic power recovery of the fault by the feeder automation function of the main station system of the distribution network automation, and greatly improves the stability and the reliability of the actual operation after the control strategy of the main station system is simulated and verified;
2. compared with actual simulation, the simulation method has the advantages that the cost is lower, the simulation is safer, the power failure difficulty of urban distribution network users is avoided, the difficulty that test sites are distributed at all ring main units in the urban area to cooperate with the test is effectively solved, and the simulation is more time-saving and labor-saving;
3. the simulation platform based on the real-time online operation system construction is characterized in that fault simulation directly adopts a protection test bed to add fault current at a preset fault point and a transformer substation outgoing line protection measurement and control device, other works are completely and automatically carried out by each system and device of the platform, a control command can be executed to simulate the actual variable position of a breaker (load switch), the action sequence and a position indicator lamp of the simulated breaker can be observed on site, and a master station can directly see the action sequence and position indicator of the breaker (load switch) through a circuit connection diagram, so that the simulation is guaranteed to the greatest extent;
4. the control strategy of the feeder automation pushing of the application can select two control modes of semi-closed loop and full-closed loop: the semi-closed loop refers to a system pushing out a control strategy, after a tester confirms manually, a related simulation breaker is operated by a remote control, and the full-closed loop refers to that manual intervention is not needed from the system pushing out the control strategy to each link of the related simulation breaker remote control;
5. the feeder automation is the centralized feeder automation of the master station, namely when the distribution network fails, the feeder automation terminal (DTU, FTU, fault indicator and the like) uploads relevant fault information to the master station system, and the master station system realizes automatic fault positioning, automatic isolation and automatic power restoration through comprehensive analysis.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a system architecture diagram of a simulation platform of the present application.
Fig. 2 is a schematic diagram of simulation example 1.
Fig. 3 is a schematic diagram of simulation example 2.
Fig. 4 and 5 are schematic diagrams of the rest of simulation examples.
Fig. 6 is an overall structural view of the post.
Fig. 7 is an exploded view of the terminal post.
Fig. 8 is a cross-sectional view of an electric wire inserted into a terminal.
Fig. 9 is a cross-sectional view of the wire as it is compressed inside the housing frame.
Fig. 10 is a structural view of the power receiving member.
Fig. 11 is a schematic diagram of dynamic variation of a flap buckle closure.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Referring to fig. 1, the present application provides a master station centralized feeder automation simulation platform comprising a master station 100 and a factory station 200.
The master station 100 comprises a master network scheduling automation master station system 101 and a distribution network scheduling automation master station system 102 connected to each other, a first head-end switch 103 connected to the master network scheduling automation master station system 101, and a second head-end switch 104 connected to the distribution network scheduling automation master station system 102.
The plant 200 comprises a plurality of substation remote terminal units 201 connected to a first pre-switch 103
(RTU), a background switch 202 connected to each substation remote terminal unit 201, a plurality of line protection measurement and control devices 203 connected to the background switch 202 and corresponding to each substation remote terminal unit 201 one to one, respectively, and a plurality of ring main unit data transmission units 204 (DTUs) connected to the second pre-switch 104; each line protection measurement and control device 203 is connected to a corresponding line analog breaker 205, and each ring main unit data transmission unit 204 is connected to a corresponding ring main unit analog breaker 206.
Each ring main unit analog circuit breaker 206 is provided with four paths of power distribution ports for respectively connecting each branch of the ring main unit, so that each branch of the ring main unit is provided with one path of ring main unit analog circuit breaker 206 for remote control.
The application also builds three simulated substations L, M, N, wherein the three simulated substations L, M, N are respectively provided with 10kV lines L1, M1 and N1; correspondingly, the line analog circuit breaker 205 has three groups (line L1 analog circuit breaker 205a, line M1 analog circuit breaker 205b, line N1 analog circuit breaker 205 c) connected to three lines L1, M1, N1, respectively; the line protection and measurement and control devices 203 corresponding to the three groups of line simulation circuit breakers 205 respectively comprise a corresponding line L1 protection and measurement and control device 203a, a corresponding line M1 protection and measurement and control device 203b and a corresponding line N1 protection and measurement and control device 203c; the substation remote terminal units 201 corresponding to the three groups of line protection measurement and control devices 203 respectively comprise a line L1 remote terminal unit 201a, a line M1 remote terminal unit 201b and a line N1 remote terminal unit 201c, the main network dispatching automation main station system 101 is respectively connected to the three groups of substation remote terminal units 201 through the first pre-switch 103, and the three remote data of the three lines L1, M1 and N1 are respectively uploaded to the main network dispatching automation main station system 101 through the three corresponding substation remote terminal units 201.
The application also builds three ring main units X, Y, Z, and the three ring main units X, Y, Z are respectively corresponding to four intervals (four paths of branch load switches) X1-X4, Y1-Y4 and Z1-Z4; correspondingly, the ring main unit analog circuit breaker 206 has three groups (an X ring main unit analog circuit breaker 206a, a Y ring main unit analog circuit breaker 206b and a Z ring main unit analog circuit breaker 206 c) corresponding to the three ring main units X, Y, Z, and each ring main unit analog circuit breaker 206 is in one-to-one corresponding connection with the four-way branch load switches X1-X4, Y1-Y4 and Z1-Z4 of each corresponding ring main unit X, Y, Z through four-way distribution ports on the ring main unit analog circuit breaker 206; the ring main unit data transmission units 204 corresponding to the three groups of ring main unit analog circuit breakers 206 respectively comprise corresponding X ring main unit data remote transmission units 204a, Y ring main unit data remote transmission units 204b and Z ring main unit data remote transmission units 204c, the distribution network dispatching automation master station system 102 is respectively connected to the three groups of ring main unit data transmission units 204 through the second front-end switch 104, and the three remote data of each branch load switch on the three ring main units X, Y, Z are respectively uploaded to the distribution network dispatching automation master station system 102 through the three corresponding ring main unit data transmission units 204.
The application replaces the circuit breakers on the 10kV lines L1, M1 and N1 and replaces the branch load switches on the branches X1-X4, Y1-Y4 and Z1-Z4 of the ring main unit through the built analog circuit breakers. The foregoing "three-remote" data forwarding uses the 104 protocol, as shown in fig. 1.
The main network dispatching automation master station system 101 and the distribution network dispatching automation master station system 102 in the application both adopt PCS9000.
Further, the line protection measurement and control device 203 of the present application is configured to collect protection action information of the lines L1, M1, and N1, and transmit the protection action information to the remote terminal unit 201 of the substation. The line protection measurement and control device 203 may directly adopt the existing line protection device, for example: nanrui security pcs9611 and Beijing square csc211.
Each substation remote terminal unit 201 is configured to collect displacement information of a corresponding line analog breaker 205, and upload the displacement information and protection action information of lines L1, M1, and N1 from the line protection measurement and control device 203 to the main network dispatching automation master station system 101 together. The "protection action information of the line L1, M1, N1" refers to the fault trip information of the line L1 or the line M1 or the line N1, and this alarm information is obtained and sent by the line protection measurement and control device 203, and is transmitted to the main network dispatching automation master station system 101 through the corresponding substation remote terminal unit 201.
When the distribution network dispatching automation master station system 102 needs to execute the operation of 'recovering power transmission', a remote control command is forwarded from the distribution network dispatching automation master station system 102 to the main network dispatching automation master station system 101, the main network dispatching automation master station system 101 issues the operation command to three transformer substation remote terminal units 201, and the transformer substation remote terminal units 201 issue the operation command to the corresponding outlets of the line protection measurement and control devices 203 for execution.
Further, the ring main unit data transmission unit 204 of the present application is configured to collect the overcurrent alarm information of each branch of the ring main unit X, Y, Z and the deflection information of the ring main unit analog breaker 206, and upload the obtained data information to the distribution network dispatching automation master station system 102. The "overcurrent alarm information" herein refers to an overcurrent alarm information that is sent when the current of each branch of the ring main unit X, Y, Z exceeds the rated current.
When the distribution network dispatching automation master station system 102 needs to execute the operations of fault isolation and power transmission recovery, a remote control command is issued from the distribution network dispatching automation master station system 102 to the outlet of the three ring main unit data transmission units 204 for execution. To ensure that the "over-current alarm" information is accurately sent, the current constant value and the time constant value of the over-current alarm of each branch must be set in the ring main unit data transmission unit 204 according to the specification requirements.
The 104 protocol is adopted for the data information forwarding.
The basic principle of the simulation by adopting the platform is as follows:
when a permanent fault (except for a small-current grounding fault) occurs to the 10kV lines L1, M1 and N1, the line protection measurement and control device 203 trips out; the circuit is tripped again (after the fault current is recovered within the setting time, the reclosing action is performed, the circuit switch is closed, if the fault current is detected again, the protection action is performed again, the circuit is represented to have a permanent fault), and then relevant protection action information (protection action information of the circuits L1, M1 and N1 generated in the process) and the deflection information of the circuit simulation breaker 205 are uploaded to the main network dispatching automation main station system 101 and forwarded to the distribution network dispatching automation main station system 102.
The fault current flows through each branch of the ring main unit X, Y, Z, and if one branch of a ring main unit exceeds the current constant value and the time constant value of the overcurrent alarm, the ring main unit data transmission unit 204 can upload the overcurrent alarm information of the corresponding branch of the ring main unit to the distribution network dispatching automation master station system 102.
The distribution network dispatching automation master station system 102 comprehensively analyzes the collected information, finds out the fault occurrence position within a certain time (about 40 seconds), then remotely pulls open the ring main unit branch closest to the fault point to isolate the fault area, and then closes the line simulation breaker 205 and/or the ring main unit simulation breaker 206 through topology analysis and remote control operation to recover the power supply of the non-fault area.
The following application presentation of a specific scenario is performed by a simulation embodiment:
simulation example 1:
as shown in fig. 2, the line of the transformer substation L, M forms a "hand-in-hand" ring for the ring main unit X, Y, Z, the opening point is located at M1, and the test steps and the action sequence are as follows, assuming that the fault occurs between Y4 and Z1 and is a permanent fault, as shown in fig. 2:
(1) Adding fault currents to L1, X4, Y1 and Y4 by using a test bed;
(2) The protection action of the transformer substation L line (when the line L1 fails, the line L1 protection measurement and control device 203a sends a protection action instruction after sensing the line failure, so that a line L1 switch trips), the L1 trips, and the fault coincides with a permanent failure, and trips again;
(3) The distribution network dispatching automation master station system 102 receives the overcurrent alarm information of L1, X4, Y1 and Y4 (no power supply is arranged on the Z1 side, so that no overcurrent alarm exists), and detects that all areas from L1 to Z4 have power failure;
(4) The distribution network dispatching automation master station system 102 locates that the fault occurs between Y4 and Z1 according to the occurrence condition of the overcurrent alarm information;
(5) The distribution network dispatching automation master station system 102 sends a remote control command to pull off Y4 and Z1 isolation faults;
(6) The distribution network dispatching automation master station system 102 remotely controls the master station system 101 to close the L1 through the main network dispatching automation master station system, so that the power supply of the X2, X3, Y2 and Y3 areas is recovered;
(7) The distribution network dispatching automation master station system 102 remotely controls the master station system 101 to close the M1 through topology analysis and load prediction under the condition that the overload of the M1 line is not caused, and then the power supply of the Z2 and Z3 areas is recovered.
Simulation example 2:
as shown in fig. 3, the line L, M of the transformer substation forms a "hand-in-hand" ring main unit X, Y, Z, the opening point is located at Z1, and the test steps and the action sequence are as follows, assuming that the fault occurs between X4 and Y1 and is a permanent fault, as shown in fig. 3:
(1) Adding fault currents to L1, X1 and X4 by using a test bed;
(2) The protection action of the transformer substation L line, the tripping of L1 is overlapped with the permanent fault, and the tripping is performed again;
(3) The distribution network dispatching automation master station system 102 receives the L1, X1 and X4 overcurrent alarm information (no power is supplied by the Y1 side, so that no overcurrent alarm exists), and detects that all areas from L1 to Y4 have power failure;
(4) The distribution network dispatching automation master station system 102 locates that the fault occurs between X4 and Y1 according to the occurrence condition of the overcurrent alarm information;
(5) The distribution network dispatching automation master station system 102 issues a remote control command to pull off the X4 and Y1 isolation faults;
(6) The distribution network dispatching automation master station system 102 remotely controls the master station system 101 to close the L1 through the main network dispatching automation master station system, and then the power supply of the X2 and X3 areas is recovered;
(7) The distribution network dispatching automation master station system 102 remotely controls the master station system 101 to close Z1 through topology analysis and load prediction under the condition that overload of a transformer substation M1 line is not caused, and power supply is recovered in the Y2 and Y3 areas.
Simulation example 3:
as shown in fig. 4 and 5, based on the 3-seat transformer substation and the 3-station ring main unit, the master station system can newly establish a plurality of sets of graphic models, and simulate feeder automation action conditions under a plurality of networking modes according to different opening points and different fault points.
The feeder automation function simulation test is usually realized by simulating a master station system to push out a control strategy through a manual setting mode and a manual setting mode, however, the simulation platform can realize 'simulation' to the greatest extent, and the feeder automation function simulation test is mainly characterized in the following aspects:
1. if each control strategy which is deduced by various parameters and systems and is required by the feeder automation function is to be actually transmitted to distribution network operation equipment, the difficulty of power failure of a distribution network line and the difficulty of matching test of a plurality of places are faced, and the difficulty can be solved by adopting the simulation platform;
2. the simulation platform is based on an online main distribution network dispatching automation master station system, the control strategy can be transferred to semi-closed loop test operation after repeated verification by the simulation platform, the simulation platform is closer to a real operation environment, and the operation risk of the verified control strategy is controllable;
3. the fault simulation only needs to add fault current at a preset fault point and a transformer substation line protection and measurement and control integrated device by adopting a protection test bed, one key is used for triggering, and other works are completely and automatically carried out by all systems and devices of the platform;
4. all control commands are executed to the actual deflection of the analog circuit breaker, the action sequence and position indicator lamps of the analog circuit breaker can be observed through arranging the screen of the analog circuit breaker, and the master station system can directly see the action sequence and deflection indication through a circuit contact diagram;
5. through the 3 substations and the 3 ring main units, the distribution network dispatching automation master station system can newly establish a plurality of sets of pattern models according to actual needs, define various parameters and control strategies which are required to be verified by users, and has stronger flexibility;
6. the main distribution network dispatching automation master station system supports functions of an operation system and a mirror image system, all simulation tests can be deployed on the mirror image system, and after the mirror image system is repeatedly verified and tested to run normally, a feeder automation control strategy is copied to the operation system, so that the functions of the operation system and the mirror image system can further improve the practicability of the simulation platform.
Further, as shown in fig. 6 to 11, the four-way distribution ports of the ring main unit analog circuit breaker 206 have the same structure, and all adopt a novel binding post 300, so that the electric wire X can be conveniently and rapidly externally connected, and the efficiency is further improved.
The terminal 300 includes an outer housing frame 301, a power receiving member 302 having a main body disposed inside the housing frame 301 and one end extending out of the housing frame 301, a force transmitting member 303 disposed at one side of the power receiving member 302, and a screw 304 coupled to a side of the housing frame 301 by screw-fitting and capable of pushing the force transmitting member 303 inward.
The housing frame 301 has a frame structure including a pair of parallel longitudinal side plates 301c and a pair of parallel transverse side plates 301d, wherein one of the longitudinal side plates 301c is provided with a penetrating opening 301a, and the wire X can be inserted into the housing frame 301 from the opening 301 a.
The electrical connector 302 is used to connect the external electrical wire X to a protection circuit inside the circuit breaker (the outer end of the electrical connector 302 can be connected to internal protection circuit components such as a bimetal, a contact group, a short-circuit protection electromagnetic trip, an arc extinguishing system, etc. inside the circuit breaker).
The power receiving member 302 includes a redirecting head 302a located inside the housing frame 301, a joint portion 302b fixed to the outer end of the redirecting head 302a, and a power receiving piece 302c fixed to the outer end of the joint portion 302 b. The redirecting head 302a is provided with a notch 302a-1 facing the threading opening 301a, and the inner side wall of the notch 302a-1 is of a smoothly curved arc-shaped profile; the power receiving piece 302c is used for directly connecting a protection circuit inside the circuit breaker, and can be provided in a straight plate-shaped or bent-shaped structure; the engagement portion 302b is a block structure integrally formed between the redirecting head 302a and the power receiving piece 302c, a clamping groove 301b is provided on the other longitudinal side plate 301c opposite to the threading opening 301a, and the engagement portion 302b can be embedded into the clamping groove 301 b.
The force transmitting member 303 is slidably provided inside the housing frame 301 in a direction perpendicular to the direction of the notch 302a-1 (corresponding to the longitudinal direction of the longitudinal side plate 301 c).
The screw 304 is screwed on one of the lateral side plates 301d, and a screw hole matched with the screw 304 is formed on the lateral side plate 301 d. The inner ends of the screws 304 extend into the interior of the housing frame 301 and are capable of pushing the force-transmitting member 303 to slide longitudinally within the interior of the housing frame 301.
The wire X can be inserted into the recess 302a-1 after penetrating the housing frame 301 from the threading opening 301a, and the tip of the wire X can contact the edge position of the recess 302 a-1; because the inner side wall of the notch 302a-1 is of a smoothly curved arc profile, the continuously extending wire X end can be reversely curved under the guidance of the profile of the notch 302a-1 to form a bending section X-1; then, the screw 304 is rotated by external force to push the force transmission piece 303 inwards, the inner end of the electric wire X can be extruded by the force transmission piece 303, so that the electric wire X is gradually close to the bending section X-1, and the bending section X-2 of the electric wire X is outwards deformed; finally, the turning part X-2 after protruding deformation is utilized to outwards squeeze the direction-changing head 302a, so that the direction-changing head 302a is tightly pressed on the inner side wall of the shell frame 301, and stable installation and tight circuit contact of all mechanisms are realized.
Preferably, the inner side wall of the notch 302a-1 is provided with a curved limit groove 302a-2 consistent with the contour trend thereof, which facilitates the guiding and deformation of the end of the wire X in the notch 302a-1 and has a lateral limit operation for the wire X, preventing the wire X from sliding and shifting laterally.
The electrical connector 302 of the present application is made of conductive metal (e.g., copper, aluminum), and other components may be made of metal/nonmetal materials.
Further, the terminal 300 of the present application further includes a stopper 305 disposed opposite to the power receiving member 302 in the lateral direction.
The stopper 305 is located at a corner portion in the housing frame 301, and one end of the stopper 305 is flush with the edge of the threading opening 301 a. The stopper 305 further includes a first overhanging plate 305a and a second overhanging plate 305b; wherein the first overhanging plate 305a extends between the redirecting head 302a and the interlayer of the other lateral side plate 301d (the one lateral side plate 301d opposite to the screw 304); the second overhanging plate 305b extends into the recess 302a-1 and is located between the inner end of the wire X and the bent section X-1 thereof. In addition, the second extension plate 305b is provided with a step surface 305c facing the end of the bending section X-1 on the side corresponding to the bending section X-1.
When the wire X extends into the notch 302a-1, the wire X can be reversely bent under the guidance of the contour of the notch 302a-1 at the early stage to form a bending section X-1; the later stage can enable the bending section X-1 to reversely extend backwards under the limitation of the second overhanging plate 305b until the end head of the bending section X-1 abuts against the step surface 305c, and the electric wire X cannot be pushed continuously; subsequently, the inner end of the wire X can be pressed by the force transmitting member 303.
Further, the force transmitting member 303 includes a force receiving portion 303a and a pressing block 303b integrally formed with the force receiving portion 303 a.
The center of the force receiving part 303a is provided with a pressure receiving groove 303a-1 opposite to the inner end of the screw 304, two sides of the pressure receiving groove 303a-1 are symmetrically provided with a pair of accommodating grooves 303a-2, a tension spring 306 is respectively fixed in the accommodating grooves 303a-2, and the other end of the tension spring 306 is fixed on the inner side wall of the shell frame 301; the force receiving portion 303a has a tendency to be pulled close to the screw 304 by the two tension springs 306, and the inner end of the screw 304 is embedded into the pressure receiving groove 303a-1 to press and push the force receiving portion 303 a.
The extrusion block 303b faces the second overhanging plate 305b, and flexible convex teeth 303b-1 are arranged at the tail end of the extrusion block, and the flexible convex teeth 303b-1 are densely distributed inclined tooth structures, which can be made of rubber; the distal ends of the flexible teeth 303b-1 face toward the recess 302a-1 of the redirection head 302 a.
Further, to ensure that the force transmitting member 303 can slide longitudinally in the housing frame 301 without falling off, limiting plates B-1 are provided on both sides of the longitudinal side plates 301c of the housing frame 301.
In order to ensure that the power receiving piece 302, the force transmitting piece 303 and the limiting piece 305 can be installed in the frame of the shell frame 301, and the power receiving piece 302 and the limiting piece 305 do not fall off in the shell frame 301, the application is provided with the integrally formed turning plate B-2 at one side edge of the shell frame 301, the turning plate B-2 can be subjected to plastic deformation, and after the power receiving piece 302, the force transmitting piece 303 and the limiting piece 305 are installed in the frame of the shell frame 301, the turning plate B-2 can be bent to cover the shell frame 301 to form protection.
In summary, the electrical connector 302, the force-transmitting member 303, the limiting member 305 and the inserted wire X of the present application can be limited and mutually bonded, and form a tightly mounted whole:
1. the structure of the power receiving element 302 is stable: the electric wire X can be pressed against the inner side wall of the housing frame 301 by its own convex deformation;
2. the stopper 305 has a stable structure: the direction-changing head 302a of the electrical connector 302 has a longitudinal limiting function on the first overhanging plate 305 a; the extrusion of the end of the bending section X-1 to the step surface 305c is abutted, so that the transverse limiting effect on the limiting piece 305 can be formed;
3. the structure of the electric wire X is stable: the force transmission piece 303 can jointly form a longitudinal limiting effect on the electric wire X with the support of the second extension plate 305b by longitudinally extruding the electric wire X; the electric wire X is folded and then coated on the periphery of the second extending plate 305b, so that a transverse limiting effect on the electric wire X can be formed;
4. the force transmitting member 303 is structurally stable: the stress balance of the wire X and the screw 304 can ensure the stable state of the force transmitting member 303.
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (8)
1. A centralized feeder automation simulation system of a main station is characterized in that: comprising the steps of (a) a step of,
a master station (100) comprising a master network scheduling automation master station system (101) and a distribution network scheduling automation master station system (102) connected to each other, a first head-end switch (103) connected to the master network scheduling automation master station system (101), and a second head-end switch (104) connected to the distribution network scheduling automation master station system (102); the method comprises the steps of,
the factory station (200) comprises a plurality of substation remote terminal units (201) connected with the first pre-exchange (103), a background exchange (202) connected with each substation remote terminal unit (201), a plurality of line protection measurement and control devices (203) connected with the background exchange (202) and respectively corresponding to each substation remote terminal unit (201) one by one, and a plurality of ring main unit data transmission units (204) connected with the second pre-exchange (104); each line protection measurement and control device (203) is respectively connected to a corresponding line simulation breaker (205), and each ring main unit data transmission unit (204) is respectively connected to a corresponding ring main unit simulation breaker (206); each ring main unit analog circuit breaker (206) is provided with four paths of power distribution ports for being connected with each branch of the ring main unit respectively, so that each branch of the ring main unit is provided with one path of ring main unit analog circuit breaker (206) for remote control;
four paths of distribution ports of the ring main unit simulation circuit breaker (206) have the same structure, and all the four paths of distribution ports adopt binding posts (300);
the binding post (300) comprises a shell frame (301), an electric receiving piece (302) arranged inside the shell frame (301) and one end of the electric receiving piece extends out of the shell frame (301), a force transmitting piece (303) arranged on the side edge of the electric receiving piece (302), and a screw (304) which is connected on the side edge of the shell frame (301) in a threaded fit manner and can push the force transmitting piece (303) inwards;
a threading opening (301 a) is formed in the shell frame (301), and an electric wire (X) can be threaded into the shell frame (301) from the threading opening (301 a);
the power receiving piece (302) comprises a direction changing head (302 a), a connecting part (302 b) fixed at the outer end of the direction changing head (302 a), and a power receiving piece (302 c) fixed at the outer end of the connecting part (302 b); the redirection head (302 a) is provided with a notch (302 a-1) facing the threading opening (301 a);
the force transmission piece (303) is arranged in the shell frame (301) in a sliding mode, and the sliding direction of the force transmission piece is perpendicular to the direction of the notch (302 a-1);
the electric wire (X) can extend into the edge of the notch (302 a-1) after penetrating into the shell frame (301) from the threading opening (301 a) and is reversely bent under the guidance of the contour of the notch (302 a-1) to form a bending section (X-1); the screw (304) can push the force transmission piece (303), can squeeze the inner end of the electric wire (X) through the force transmission piece (303), enable the electric wire to be close to the bending section (X-1) and to be subjected to convex deformation at the turning position (X-2) of the electric wire and the bending section, and the bent position (X-2) after deformation is utilized to press the redirection head (302 a) on the inner side wall of the shell frame (301).
2. The master station centralized feeder automation simulation system of claim 1, wherein: the three-station simulation transformer substation is characterized by further comprising three built simulation transformer substations (L, M, N), wherein the three simulation transformer substations (L, M, N) are respectively provided with a 10kV line (L1, M1, N1);
the line simulation breaker (205) is provided with three groups corresponding to three lines (L1, M1 and N1), namely a line L1 simulation breaker (205 a), a line M1 simulation breaker (205 b) and a line N1 simulation breaker (205 c);
the line protection measurement and control devices (203) corresponding to the three groups of line simulation circuit breakers (205) respectively comprise corresponding line L1 protection measurement and control devices (203 a), line M1 protection measurement and control devices (203 b) and line N1 protection measurement and control devices (203 c);
the transformer substation remote terminal units (201) corresponding to the three groups of line protection measurement and control devices (203) respectively comprise corresponding line L1 remote terminal units (201 a), line M1 remote terminal units (201 b) and line N1 remote terminal units (201 c); the main network dispatching automation main station system (101) is connected to three groups of substation remote terminal units (201) through the first pre-switch (103).
3. The master station centralized feeder automation simulation system of claim 2, wherein: the method also comprises three built ring main units (X, Y, Z), wherein the three ring main units (X, Y, Z) respectively correspond to four branches (X1-X4, Y1-Y4, Z1-Z4);
the ring main unit simulation breaker (206) is provided with three groups corresponding to three ring main units (X, Y and Z), namely an X ring main unit simulation breaker (206 a), a Y ring main unit simulation breaker (206 b) and a Z ring main unit simulation breaker (206 c); each ring main unit analog breaker (206) is connected with four paths of branches (X1-X4, Y1-Y4 and Z1-Z4) of each ring main unit (X, Y and Z) in a one-to-one correspondence manner through four paths of distribution ports on the analog breaker;
the ring main unit data transmission units (204) corresponding to the three groups of ring main unit analog circuit breakers (206) respectively comprise corresponding X ring main unit data remote transmission units (204 a), Y ring main unit data remote transmission units (204 b) and Z ring main unit data remote transmission units (204 c); the distribution network dispatching automation master station system (102) is connected to three groups of ring main unit data transmission units (204) through the second pre-switch (104).
4. A centralized feeder automation simulation system of a master station according to any one of claims 1 to 3, wherein: the PCS9000 is adopted by the main network dispatching automation master station system (101) and the distribution network dispatching automation master station system (102).
5. The master station centralized feeder automation simulation system of claim 4, wherein: the line protection measurement and control device (203) is used for collecting line (L1, M1, N1) protection action information and transmitting the information to the transformer substation remote terminal unit (201);
the remote terminal unit (201) of the transformer substation is used for collecting deflection information of the circuit simulation breaker (205) and uploading the deflection information and protection action information of the circuits (L1, M1 and N1) from the circuit protection measurement and control device (203) to the main network dispatching automation master station system (101);
when the distribution network dispatching automation master station system (102) needs to execute the power transmission restoration operation, a remote control command is forwarded from the distribution network dispatching automation master station system (102) to the main network dispatching automation master station system (101), the main network dispatching automation master station system (101) transmits the operation command to three transformer substation remote terminal units (201), and the transformer substation remote terminal units (201) transmit the operation command to an outlet of the line protection measurement and control device (203) for execution;
the ring main unit data transmission unit (204) is used for collecting overcurrent alarm information of each branch of the ring main unit (X, Y, Z) and deflection information of the ring main unit analog circuit breaker (206), and uploading the obtained data information to the distribution network dispatching automation master station system (102); when the distribution network dispatching automation master station system (102) needs to execute fault isolation and power transmission recovery operation, a remote control command is issued from the distribution network dispatching automation master station system (102) to the outlets of the three ring main unit data transmission units (204) for execution;
the data information forwarding adopts 104 protocol.
6. The master station centralized feeder automation simulation system of claim 5, wherein: when the lines (L1, M1 and N1) have permanent faults, the line protection measurement and control device (203) controls the lines to trip, the line switch is switched on after fault current is recovered within a set time, and if the fault current is detected again, the line is protected and tripped again, the line is represented to have permanent faults; the remote terminal unit (201) of the transformer substation uploads the protection action information of the lines (L1, M1, N1) and the deflection information of the line simulation breaker (205) generated in the process to the main network dispatching automation main station system (101) and forwards the protection action information and the deflection information of the line simulation breaker (205) to the distribution network dispatching automation main station system (102);
the fault current flows through all the branches of the ring main units (X, Y and Z), if one branch of a ring main unit exceeds the current constant value and the time constant value of the overcurrent alarm, the ring main unit data transmission unit (204) can upload the overcurrent alarm information of the corresponding branch of the ring main unit to the distribution network dispatching automation master station system (102);
the distribution network dispatching automation master station system (102) locates the position where the fault occurs according to the collected overcurrent alarm information, remotely pulls open the ring main unit simulation breaker (206) closest to the fault point to isolate the fault area, and then closes the line simulation breaker (205) or the ring main unit simulation breaker (206) through topology analysis and remote control operation to recover the power supply of the non-fault area.
7. The master station centralized feeder automation simulation system of claim 6, wherein: the binding post (300) further comprises a limiting piece (305) which is arranged opposite to the power receiving piece (302);
the limiting piece (305) is positioned at one corner part in the shell frame (301), comprises a first overhanging plate (305 a) extending between the redirecting head (302 a) and the interlayer of the shell frame (301), and also comprises a second overhanging plate (305 b) extending between the inner end of the electric wire (X) and the bending section (X-1) of the electric wire;
one side of the second overhanging plate (305 b) corresponding to the bending section (X-1) is provided with a step surface (305 c) opposite to the end of the bending section (X-1).
8. The master station centralized feeder automation simulation system of claim 7, wherein: the force transmission piece (303) comprises a force receiving part (303 a) and an extrusion block (303 b) fixed on the force receiving part (303 a);
a compression groove (303 a-1) opposite to the inner end of the screw (304) is arranged in the center of the stress part (303 a), a pair of accommodating grooves (303 a-2) are symmetrically arranged on two sides of the compression groove (303 a-1), a tension spring (306) is respectively fixed in each accommodating groove (303 a-2), and the other end of the tension spring (306) is fixed on the inner side wall of the shell frame (301);
the pressing block (303 b) is opposite to the second overhanging plate (305 b) and is provided with flexible convex teeth (303 b-1) at the tail end, and the tail end of the flexible convex teeth (303 b-1) faces towards the notch (302 a-1) of the direction-changing head (302 a).
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