CN112364495A - Centralized feeder automation simulation platform of main website - Google Patents
Centralized feeder automation simulation platform of main website Download PDFInfo
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- CN112364495A CN112364495A CN202011198543.0A CN202011198543A CN112364495A CN 112364495 A CN112364495 A CN 112364495A CN 202011198543 A CN202011198543 A CN 202011198543A CN 112364495 A CN112364495 A CN 112364495A
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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 invention discloses a centralized feeder automation simulation platform of a main station, which comprises: the system comprises a main station, a distribution network dispatching automation main station system, a first front-mounted switch and a second front-mounted switch, wherein the main station and the distribution network dispatching automation main station system are connected with each other; the plant station comprises a plurality of transformer substation remote terminal units connected with the first front-end switch, a background switch connected with each transformer substation remote terminal unit, a plurality of line protection measurement and control devices connected with the background switch and respectively corresponding to the transformer substation remote terminal units one by one, and a plurality of ring main unit data transmission units connected with the second front-end switch; each line protection measurement and control device and looped netowrk cabinet data transmission unit are connected to a corresponding analog circuit breaker respectively. The invention can realize low simulation cost and high safety, and has no power failure difficulty and matching test difficulty at each ring main unit.
Description
Technical Field
The invention relates to the field of power simulation, in particular to a centralized feeder automation simulation platform of a master station.
Background
The various parameters required for the feeder automation function and each control strategy derived by the system will have a lot of difficulties if it is actually transmitted to the distribution network operation equipment: first, power failure of urban distribution network users is difficult. Secondly, the test sites are distributed at each ring main unit in the urban area, the matching test is difficult, thirdly, the simulation safety is poor, and the simulation cost is high.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the problems occurring in the prior art.
Therefore, an object of the present invention is to provide a centralized feeder automation simulation platform for a master station, which is capable of implementing low simulation cost and high security, and is free from power failure difficulty and matching test difficulty at each ring main unit, so as to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme: a centralized feeder automation simulation platform of main website, it includes: the system comprises a main station, a first front-mounted switch and a second front-mounted switch, wherein the main station comprises a main network dispatching automatic main station system and a distribution network dispatching automatic main station system which are connected with each other; the plant station comprises a plurality of transformer substation remote terminal units connected with the first front-end switch, a background switch connected with each transformer substation remote terminal unit, a plurality of line protection measurement and control devices connected with the background switch and respectively corresponding to the transformer substation remote terminal units one by one, and a plurality of ring main unit data transmission units connected with the second front-end switch; each line protection measurement and control device is connected to a corresponding line simulation circuit breaker respectively, and each looped netowrk cabinet data transmission unit is connected to a corresponding looped netowrk cabinet simulation circuit breaker respectively.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: each looped netowrk cabinet simulated circuit breaker all is provided with four ways distribution port for each branch road of connecting the looped netowrk cabinet respectively, make each branch road of looped netowrk cabinet all possess looped netowrk cabinet simulated circuit breaker remote control of the same kind.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: the transformer substation comprises three built simulation transformer substations L, M, N, wherein each simulation transformer substation L, M, N is provided with a 10kV line L1, M1 and N1; the circuit simulation circuit breaker comprises three groups corresponding to three lines L1, M1 and N1, namely a line L1 simulation circuit breaker, a line M1 simulation circuit breaker and a line N1 simulation circuit breaker; the line protection measurement and control devices corresponding to the three groups of the line simulation circuit breakers respectively comprise corresponding line L1 protection measurement and control devices, line M1 protection measurement and control devices and line N1 protection measurement and control devices; the substation remote terminal units corresponding to the three groups of 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; and the main network dispatching automation master station system is connected to three groups of substation remote terminal units through the first front-end switch.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: the three ring main units X, Y, Z respectively correspond to four branch circuits X1-X4, Y1-Y4 and Z1-Z4; the ring main unit simulation circuit breakers comprise three groups corresponding to the three ring main units X, Y, Z, namely an X ring main unit simulation circuit breaker, a Y ring main unit simulation circuit breaker and a Z ring main unit simulation circuit breaker; each looped network cabinet simulated breaker is correspondingly connected with four branches X1-X4, Y1-Y4 and Z1-Z4 of each looped network cabinet X, Y, Z one by one through four power distribution ports on each looped network cabinet simulated breaker; the ring main unit data transmission units corresponding to the three groups of ring main unit simulation 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; and the distribution network dispatching automation master station system is connected to the three groups of ring main units through the second front-end switch.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: and the main network dispatching automation master station system and the distribution network dispatching automation master station system both adopt PCS 9000.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: the line protection, measurement and control device is used for collecting protection action information of lines L1, M1 and N1 and transmitting the protection action information to the substation remote terminal unit; the substation remote terminal unit is used for acquiring displacement information of the circuit simulation breaker and uploading the displacement 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 power transmission recovery operation, a remote control command is forwarded to the main network dispatching automation master station system from the distribution 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 to the outlet of the line protection measurement and control device for 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 ring main unit simulated breaker displacement information, 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 recover power transmission 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 an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: when permanent faults occur in the lines L1, M1 and N1, the line protection measurement and control device controls the lines to trip, after fault current is recovered within setting time, reclosing action is carried out, the line switch is closed, if the fault current is detected again, protection action is carried out and the lines trip again, the permanent faults occur on the lines; the substation remote terminal unit uploads the protection action information of the lines L1, M1 and N1 and the displacement information of the line simulation circuit breaker generated in the process to the main network dispatching automation master station system and then forwards the protection action information and the displacement information to the distribution network dispatching automation master station system; fault current flows through each branch of the ring main unit X, Y, Z, if one branch of a certain ring main unit exceeds a current fixed value and a time fixed value of an overcurrent alarm, the ring main unit data transmission unit can upload overcurrent alarm information of the corresponding branch of the ring main unit to a distribution network dispatching automation master station system; the distribution network dispatching automation master station system positions the position of fault occurrence according to the collected overcurrent alarm information, remotely pulls the ring main unit simulation circuit breaker closest to the fault point away from the fault area, closes the circuit simulation circuit breaker or the ring main unit simulation circuit breaker through topology analysis and remote operation, and recovers the power supply of the non-fault area.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: the four power distribution ports of the ring main unit simulation circuit breaker have the same structure and adopt binding posts; the wiring terminal comprises a shell frame, an electric connecting piece, a force transmission piece and a screw, wherein the electric connecting piece is arranged in the shell frame, one end of the electric connecting piece extends out of the shell frame, the force transmission piece is arranged on the side edge of the electric connecting piece, and the screw is connected to the side edge of the shell frame in a threaded fit mode and can push the force transmission piece inwards; the shell frame is provided with a threading port, and an electric wire can be threaded into the shell frame from the threading port; the electric connecting piece comprises a redirection head, a connecting part fixed at the outer end of the redirection head and an electric connecting piece fixed at the outer end of the connecting part; the bend head is provided with a notch facing the threading opening; the force transmission piece is arranged inside the shell frame in a sliding mode, 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 is reversely bent under the guidance of the notch profile to form a bending section; the screw can promote pass power piece to can pass the inner of power piece extrusion electric wire, make it be close to the bending segment and take place evagination deformation in both turning department, utilize the turning department after the deformation will turn to the head and press on the inside wall of casing frame.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: the binding post also comprises a limiting piece arranged opposite to the electric connecting piece; the limiting piece is positioned at one corner in the shell frame and comprises a first extending plate extending to a position between the steering head and a shell frame interlayer and a second extending plate extending to a position between the inner end of the electric wire and the bending section of the electric wire; one side of the second outer extending plate corresponding to the bending section is provided with a step surface opposite to the end head of the bending section.
As an optimal scheme of the master station centralized feeder automation simulation platform, the method comprises the following steps: the force transmission piece comprises a force bearing part and an extrusion block fixed on the force bearing 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 fixed in each accommodating groove, and the other end of each tension spring is fixed on the inner side wall of the shell frame; the extrusion block is opposite to the second outward extending plate, the tail end of the extrusion block is provided with a flexible convex tooth, and the tail end of the flexible convex tooth faces to the notch of the steering head.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
the method can realize the simulation of feeder automation by simulating the automation of main network scheduling and the automation of distribution network scheduling, is used for simulating automatic fault positioning, automatic isolation and automatic power restoration through the feeder automation function of a distribution network automation main station system when a main line fault or a branch line fault occurs in a typical distribution network main network mode, and is put into practical operation after a main station system control strategy is simulated and verified, so that the stability and reliability of the practical operation are greatly improved;
compared with actual simulation, the cost is lower, the simulation is safer, the power failure difficulty of urban distribution network users is avoided, the difficulty of matching tests when test sites are distributed at each ring main unit in a city is effectively solved, and the simulation is more time-saving and labor-saving;
thirdly, based on a simulation platform constructed by a real-time online operation system, fault simulation directly adopts a protection test bed to add fault current at a preset fault point and a substation outgoing line protection measurement and control device, all the rest work is completely and automatically carried out by each system and device of the platform, a control command can be executed to the actual variable position of a simulated circuit breaker (load switch), the action sequence and a position indicator lamp of the simulated circuit breaker can be observed on site, a master station can directly see the action sequence and the position indication of the circuit breaker (load switch) through a line contact diagram, and the simulation is ensured to the maximum extent;
fourthly, the control strategy of the feeder automation push can select two control modes of 'semi-closed loop' and 'full-closed loop': the semi-closed loop refers to a control strategy pushed out by the system, and after manual confirmation by a tester, relevant simulation circuit breakers are operated in a remote control mode, and the full-closed loop refers to the situation that all links from the control strategy pushed out by the system to the remote control operation of the relevant simulation circuit breakers do not need manual intervention;
and fifthly, feeder automation is centralized feeder automation of the main station, namely when the distribution network fails, a feeder automation terminal (a DTU, an FTU, a fault indicator and the like) uploads related fault information to the main station system, and the main 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 invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a system architecture diagram of the simulation platform of the present invention.
Fig. 2 is a simulation diagram of simulation example 1.
Fig. 3 is a simulation diagram of simulation example 2.
Fig. 4 and 5 are simulation diagrams of other simulation examples.
Fig. 6 is an overall structural view of the terminal.
Fig. 7 is an exploded view of the stud.
Fig. 8 is a sectional view of a wire inserted into the terminal.
Fig. 9 is a sectional view of the electric wire when being pressed inside the housing frame.
Fig. 10 is a structural view of the electric connection part.
Fig. 11 is a schematic view of the dynamic variation of the flap-bending cover.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. 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 invention provides a master station centralized feeder automation simulation platform including a master station 100 and a plant station 200.
The master station 100 includes a master scheduling automation master station system 101 and a distribution network scheduling automation master station system 102 connected to each other, a first front-end switch 103 connected to the master scheduling automation master station system 101, and a second front-end switch 104 connected to the distribution network scheduling automation master station system 102.
The plant station 200 comprises a plurality of substation remote terminal units 201 connected to the first front-end switch 103
(RTU), a background switch 202 connected with each substation remote terminal unit 201, a plurality of line protection measurement and control devices 203 connected with the background switch 202 and corresponding to each substation remote terminal unit 201 one by one, and a plurality of ring main unit data transmission units 204(DTU) connected with the second front switch 104; each line protection measurement and control device 203 is connected to a corresponding line simulation circuit breaker 205, and each ring main unit data transmission unit 204 is connected to a corresponding ring main unit simulation circuit breaker 206.
Each looped netowrk cabinet circuit breaker 206 all is provided with four ways distribution port for each branch road of connecting the looped netowrk cabinet respectively, make each branch road of looped netowrk cabinet all possess looped netowrk cabinet circuit breaker 206 remote control of the same kind.
The invention also builds three simulation substations L, M, N, wherein each simulation substation L, M, N is provided with a 10kV line L1, M1 and N1; accordingly, the line simulator breaker 205 has three sets (line L1 simulator breaker 205a, line M1 simulator breaker 205b, line N1 simulator breaker 205c) connected to three lines L1, M1, N1, respectively; the line protection and monitoring devices 203 corresponding to the three groups of line simulation circuit breakers 205 respectively comprise corresponding line L1 protection and monitoring devices 203a, line M1 protection and monitoring devices 203b and line N1 protection and monitoring devices 203 c; the substation remote terminal units 201 corresponding to the three groups of line protection measurement and control devices 203 respectively include 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 master station system 101 is respectively connected to the three groups of substation remote terminal units 201 through the first front-end switch 103, and the three-remote data of the three lines L1, M1, and N1 are respectively uploaded to the main network dispatching automation master station system 101 through the three corresponding substation remote terminal units 201.
The invention also builds three ring main units X, Y, Z, wherein three ring main units X, Y, Z are respectively provided with four intervals (four-way branch load switches) X1-X4, Y1-Y4 and Z1-Z4; correspondingly, the ring main unit simulated circuit breaker 206 has three groups (X ring main unit simulated circuit breaker 206a, Y ring main unit simulated circuit breaker 206b, Z ring main unit simulated circuit breaker 206c, respectively) corresponding to the three ring main units X, Y, Z, and each ring main unit simulated circuit breaker 206 is connected with the four branch load switches X1-X4, Y1-Y4, Z1-Z4 of each corresponding ring main unit X, Y, Z in a one-to-one correspondence manner through four power distribution ports on the ring main unit simulated circuit breaker; the ring main unit data transmission units 204 corresponding to the three groups of ring main unit simulation breakers 206 respectively include 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 built analog circuit breaker replaces circuit breakers on 10kV lines L1, M1 and N1 and branch load switches on branch circuits X1-X4, Y1-Y4 and Z1-Z4 of a ring main unit. The above-mentioned "three remote" data forwarding all adopts 104 protocol, as shown in fig. 1.
The automatic master station system 101 for master network scheduling and the automatic master station system 102 for distribution network scheduling in the invention both adopt PCS 9000.
Further, the line protection measurement and control device 203 of the present invention is configured to collect protection action information of the lines L1, M1, and N1, and transmit the protection action information to the substation remote terminal unit 201. The line protection measurement and control device 203 can directly adopt the existing line protection device, such as: the Nanrui relay protection pcs9611 and the Beijing tetragonal csc 211.
Each substation remote terminal unit 201 is configured to acquire displacement information of the corresponding line simulation circuit breaker 205, and upload the displacement information and information of protection actions of the lines L1, M1, and N1 from the line protection measurement and control device 203 to the main network dispatching automation master station system 101. Here, "protection action information of the lines L1, M1, and N1" refers to fault trip information of the line L1, the line M1, or the line N1, and this warning 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', the remote control command is forwarded to the main network dispatching automation master station system 101 from the distribution network dispatching automation master station system 102, the main network dispatching automation master station system 101 issues the operation command to the three substation remote terminal units 201, and the substation remote terminal units 201 issue the operation command to the corresponding line protection measurement and control devices 203 for export execution.
Further, the ring main unit data transmission unit 204 of the present invention is configured to collect the overcurrent alarm information of each branch of the ring main unit X, Y, Z and the displacement information of the ring main unit analog circuit breaker 206, and upload the obtained data information to the distribution network dispatching automation master station system 102. The "overcurrent alarm information" here means that when the current of each branch of the ring main unit X, Y, Z exceeds the rated current, the overcurrent alarm information is sent out.
When the distribution network dispatching automation master station system 102 needs to execute the operations of fault isolation and power transmission recovery, the 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. In order to ensure that the overcurrent alarm information is accurately sent, the current fixed value and the time fixed value of each branch overcurrent alarm must be set in the ring main unit data transmission unit 204 according to the standard requirements.
The data information forwarding adopts 104 protocols.
The basic principle of the simulation by adopting the platform is as follows:
when permanent faults (except low-current ground faults) occur on 10kV lines L1, M1 and N1, the line protection measurement and control device 203 trips out; when the fault occurs, the line trips again (after the fault current recovers within the setting time, the line recloses, the line switch closes, if the fault current is detected again, the protection action is performed and the line trips again, it represents that the line has a permanent fault), and then the relevant protection action information (the protection action information of the lines L1, M1 and N1 generated in the process) and the displacement information of the line simulation circuit breaker 205 are uploaded to the main network dispatching automation master station system 101 and then forwarded to the distribution network dispatching automation master station system 102.
When fault current flows through each branch of the ring main unit X, Y, Z, if one branch of a certain ring main unit exceeds the current fixed value and the time fixed 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 position of the fault within a certain time (about 40 seconds), remotely pulls away the ring main unit branch closest to the fault point to isolate the fault area, closes the circuit simulation breaker 205 and/or the ring main unit simulation breaker 206 through topology analysis and remote operation, and recovers the power supply of the non-fault area.
The following description of application demonstration of a specific scenario is performed by a simulation embodiment:
simulation example 1:
as shown in fig. 2, the line of the substation L, M forms a "hand-pulled" ring for the ring main unit X, Y, Z, the opening point is located at M1, and if a fault occurs between Y4 and Z1 and is a permanent fault, as shown in fig. 2, the test steps and the action sequence are as follows:
(1) adding fault current to L1, X1, X4, Y1 and Y4 by using a test bed;
(2) a substation L line protection action (when a line L1 fails, the line L1 protection measurement and control device 203a sends a protection action command after sensing the line failure, so that the line L1 switch trips), and L1 trips, coincides with a permanent fault, and trips again;
(3) the distribution network dispatching automation master station system 102 receives the overcurrent alarm information of L1, X1, X4, Y1 and Y4 (no power supply exists on the Z1 side, so no overcurrent alarm exists), and detects that all areas from L1 to Z4 are powered off;
(4) the distribution network dispatching automation master station system 102 positions the fault 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 open the Y4 and the Z1 to isolate faults;
(6) the distribution network dispatching automation master station system 102 remotely controls the L1 to be closed through the master network dispatching automation master station system 101, and then power supply is restored in the X2, X3, Y2 and Y3 areas;
(7) the distribution network dispatching automation master station system 102 remotely switches on the M1 through the master network dispatching automation master station system 101 under the condition of not causing overload of an M1 line through topology analysis and load prediction, and power supply is recovered in Z2 and Z3 areas.
Simulation example 2:
as shown in fig. 3, the line of the substation L, M forms a "hand-pulling" ring for X, Y, Z ring main units, the opening point is located at Z1, and if a fault occurs between X4 and Y1 and is a permanent fault, as shown in fig. 3, the test steps and the action sequence are as follows:
(1) adding fault current to L1, X1 and X4 by using a test bed;
(2) the L line of the transformer substation is protected, L1 trips, coincides with a permanent fault, and trips again;
(3) the distribution network dispatching automation master station system 102 receives the L1, X1 and X4 overcurrent alarm information (no power supply exists at the Y1 side, so that no overcurrent alarm exists), and detects that all areas from L1 to Y4 are powered off;
(4) the distribution network dispatching automation master station system 102 positions the fault 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 open the X4 and the Y1 to isolate faults;
(6) the distribution network dispatching automation master station system 102 remotely controls the L1 to be closed through the master network dispatching automation master station system 101, and then power supply is restored in the X2 and X3 areas;
(7) the distribution network dispatching automation master station system 102 remotely controls the Z1 through the master network dispatching automation master station system 101 under the condition that the line of the transformer substation M1 is not overloaded through topology analysis and load prediction, and then power supply is recovered in Y2 and Y3 areas.
Simulation example 3:
as shown in fig. 4 and 5, based on "3 substations" and "3 ring main units", the master station system may create multiple sets of drawing models, and simulate feeder automation behavior in multiple networking modes according to different opening points and different fault points.
Feeder automation function simulation test usually just simulates a master station system to release a control strategy through manual setting and manual setting, but the simulation platform can realize simulation to the greatest extent, and is mainly embodied in the following aspects:
firstly, if various parameters required by a feeder automation function and each control strategy pushed out by a system are actually transmitted to distribution network operation equipment, the power failure of a distribution network line and the difficulty of a plurality of site matching tests are faced, and the problem can be solved by adopting the simulation platform;
secondly, the simulation platform is based on an online main distribution network dispatching automation master station system, a control strategy can be switched into semi-closed loop trial operation after being repeatedly verified 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;
thirdly, fault simulation is carried out only by adding fault current to a preset fault point and a transformer substation line protection measurement and control integrated device by adopting a protection test bed, triggering is carried out by one key, and other work is completely and automatically carried out by each system and device of the platform;
fourthly, all the control commands are executed to simulate the actual displacement of the circuit breaker, the action sequence and the position indicator light of the simulated circuit breaker can be observed by arranging a simulated circuit breaker screen, and the action sequence and the displacement indication can also be directly seen by the master station system through a line contact diagram;
through the 3 substations and the 3 ring main units, the distribution network dispatching automation master station system can create a plurality of sets of drawing models according to actual needs, defines various parameters and control strategies needed to be verified by users, and has strong flexibility;
and sixthly, the automatic master station system for dispatching the main distribution network supports functions of an operation system and a mirror image system, all simulation tests can be deployed on the mirror image system, a feeder automation control strategy is 'copied' to the operation system after the mirror image system is repeatedly verified and normally operated in a test mode, and the operation system and the mirror image system function further improve the practicability of the simulation platform.
Further, as shown in fig. 6 to 11, the four power distribution ports of the ring main unit analog circuit breaker 206 of the present invention have the same structure, and all adopt a novel binding post 300, so as to conveniently and rapidly connect the external wire X, thereby further improving the efficiency.
The binding post 300 comprises an external shell frame 301, an electric connecting piece 302 with a main body arranged inside the shell frame 301 and one end extending out of the shell frame 301, a force transmission piece 303 arranged on one side of the electric connecting piece 302, and a screw 304 connected to the side of the shell frame 301 through screw thread fit and capable of pushing the force transmission piece 303 inwards.
The casing frame 301 is a frame-shaped structure, and includes a pair of longitudinal side plates 301c parallel to each other and a pair of transverse side plates 301d parallel to each other, wherein one of the longitudinal side plates 301c is provided with a threading opening 301a penetrating from inside to outside, and an electric wire X can be threaded into the casing frame 301 from the threading opening 301 a.
The electric connection member 302 is used for connecting an external electric wire X to a protection circuit inside the circuit breaker (internal protection circuit components such as a bimetal, a contact set, a short-circuit protection electromagnetic trip, an arc extinguishing system, etc. the outer end of the electric connection member 302 can be communicated to the inside of the circuit breaker).
The electric connecting member 302 includes a redirecting head 302a located inside the housing frame 301, an engaging portion 302b fixed to an outer end of the redirecting head 302a, and an electric connecting piece 302c fixed to an outer end of the engaging portion 302 b. The direction changing 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 a smoothly curved arc profile; the electric connecting piece 302c is used for directly connecting a protection circuit inside the circuit breaker and can be arranged in a straight plate-shaped or bent structure; the connecting part 302b is a block-shaped structure integrally formed between the redirection head 302a and the electric receiving piece 302c, a clamping groove 301b is arranged on the other longitudinal side plate 301c opposite to the threading opening 301a, and the connecting part 302b can be embedded into the clamping groove 301 b.
The force-transmitting member 303 is slidably disposed 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 the lateral side plate 301d is provided with a screw hole matched with the screw 304. The inner end of the screw 304 extends into the housing frame 301 and pushes the force-transmitting member 303 to slide longitudinally inside the housing frame 301.
The electric wire X can extend into the notch 302a-1 after penetrating into the shell frame 301 from the threading opening 301a, and the end of the electric wire X can contact the edge position of the notch 302 a-1; because the inner side wall of the notch 302a-1 is a smoothly curved arc-shaped contour, the end of the wire X which continuously extends into the notch can be reversely curved under the guidance of the contour of the notch 302a-1 to form a bending section X-1; then, the screw 304 is rotated by an external force to push the force transmission piece 303 inwards, and the inner end of the wire X can be extruded by the force transmission piece 303 to be gradually close to the bending section X-1 and generate convex deformation at the turning part X-2 of the wire X and the bending section X-1; finally, the turning part X-2 after the outward deformation is utilized to extrude the redirecting head 302a outwards, and the redirecting head 302a is tightly pressed on the inner side wall of the shell frame 301, so that the stable installation of all mechanisms and the tight circuit contact are realized.
Preferably, the inner side wall of the notch 302a-1 is provided with a curved limiting groove 302a-2 which is consistent with the contour of the notch and facilitates the guiding and deformation of the end of the wire X in the notch 302a-1, and has a lateral limiting operation on the wire X to prevent the wire X from laterally slipping and shifting.
The electric connecting piece 302 is made of conductive metal (such as copper and aluminum), and other parts can be made of metal/nonmetal materials selectively.
Further, the contact post 300 of the present invention further includes a stopper 305 disposed opposite to the electrical connection member 302 in a lateral direction.
The limiting member 305 is located at one corner in the housing frame 301, and one end of the limiting member 305 is flush with the edge of the threading opening 301 a. The limiting member 305 further includes a first extending plate 305a and a second extending plate 305 b; wherein, the first overhanging plate 305a extends to between the interlayer of the redirecting head 302a and the other lateral side plate 301d (the lateral side plate 301d opposite to the screw 304); the second overhang plate 305b extends into the recess 302a-1 and is located between the inner end of the electric wire X and the bent portion X-1 thereof. In addition, one side of the second outward extending plate 305b corresponding to the bending section X-1 is provided with a step surface 305c opposite to the end of the bending section X-1.
When the electric wire X extends into the notch 302a-1, the front stage can be reversely bent under the guidance of the profile of the notch 302a-1 to form a bent section X-1; in the later stage, the bending section X-1 can be reversely extended backward under the limitation of the second external extension plate 305b until the tip thereof abuts against the step surface 305c, and the electric wire X cannot be pushed continuously; subsequently, the inner end of the wire X may 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 on the force receiving portion 303 a.
A pressure groove 303a-1 opposite to the inner end of the screw 304 is arranged at the center of the pressure-bearing part 303a, a pair of accommodating grooves 303a-2 are symmetrically arranged at two sides of the pressure groove 303a-1, 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 fitted into the pressure receiving groove 303a-1, pressing and pushing the force receiving portion 303 a.
The extrusion block 303b faces the second outward extending plate 305b, and the tail end of the extrusion block is provided with flexible convex teeth 303b-1, and the flexible convex teeth 303b-1 are densely distributed inclined tooth-shaped structures and can be made of rubber; the tip of flexible lobe 303b-1 faces notch 302a-1 of redirecting head 302 a.
Furthermore, in order to ensure that the force transmission member 303 can slide longitudinally on the housing frame 301 without falling off, two sides of the longitudinal side plate 301c of the housing frame 301 are provided with a limiting plate B-1.
In order to ensure that the electric connecting piece 302, the force transmission piece 303 and the limiting piece 305 can be installed in the frame of the shell frame 301, and the electric connecting piece 302 and the limiting piece 305 do not fall off in the shell frame 301, the invention is characterized in that an integrally formed turning plate B-2 is arranged on one side edge of the shell frame 301, the turning plate B-2 can generate plastic deformation, and after the electric connecting piece 302, the force transmission 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 be covered on the shell frame 301 to form protection.
In summary, the electric connecting element 302, the force transmitting element 303, the limiting element 305 and the inserted electric wire X of the present invention can limit and wrap each other, and by forming a tightly installed whole:
firstly, the structure of the electric connection piece 302 is stable: the electric wire X can be extruded on the inner side wall of the shell frame 301 through self convex deformation;
secondly, the structure of the stopper 305 is stable: the bend 302a of the electric connecting piece 302 has a longitudinal limiting effect on the first outward extending plate 305 a; the end of the bending section X-1 is pressed and abutted against the step surface 305c, so that the transverse limiting effect on the limiting piece 305 can be formed;
thirdly, the structure of the wire X is stable: the longitudinal extrusion of the force transmission piece 303 on the electric wire X can form a longitudinal limiting effect on the electric wire X together with the bearing of the second external extension plate 305 b; the wire X is bent and then coated on the periphery of the second external extension plate 305b, so that the transverse limiting effect on the wire X can be formed;
fourthly, the structure of the force transmission piece 303 is stable: the stress balance between the wire X and the screw 304 can ensure the stable state of the force transmission 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, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a centralized feeder automation simulation platform of main website which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a master station (100) comprising a master network scheduling automation master station system (101) and a distribution network scheduling automation master station system (102) which are connected with each other, a first front-end switch (103) connected with the master network scheduling automation master station system (101), and a second front-end switch (104) connected with the distribution network scheduling automation master station system (102); and the number of the first and second groups,
the plant station (200) comprises a plurality of substation remote terminal units (201) connected with the first front-end switch (103), a background switch (202) connected with each substation remote terminal unit (201), a plurality of line protection measurement and control devices (203) which are connected with the background switch (202) and respectively correspond 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 front-end switch (104); each line protection measurement and control device (203) is connected to a corresponding line simulation circuit breaker (205) respectively, and each ring main unit data transmission unit (204) is connected to a corresponding ring main unit simulation circuit breaker (206) respectively.
2. The master station centralized feeder automation simulation platform of claim 1, wherein: each looped netowrk cabinet mimic-disconnecting switch (206) all is provided with four ways distribution port for each branch road of connecting the looped netowrk cabinet respectively, make each branch road of looped netowrk cabinet all possess looped netowrk cabinet mimic-disconnecting switch (206) remote control of the same kind.
3. The master station centralized feeder automation simulation platform of claim 1 or 2, wherein: the system also comprises three built simulation transformer substations (L, M and N), wherein the three simulation transformer substations (L, M and N) are respectively provided with a 10kV line (L1, M1 and N1);
the line simulation breaker (205) has three groups corresponding to three lines (L1, M1, N1), namely a line L1 simulation breaker (205a), a line M1 simulation breaker (205b) and a line N1 simulation breaker (205 c);
the line protection measurement and control devices (203) corresponding to the three groups of the line simulation circuit breakers (205) respectively comprise corresponding line L1 protection measurement and control devices (203a), line M1 protection measurement and control devices (203b) and line N1 protection measurement and control devices (203 c);
the 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 (201a), line M1 remote terminal units (201b) and line N1 remote terminal units (201 c); the master dispatch automation master station system (101) is connected to three groups of substation remote terminal units (201) through the first front-end switch (103).
4. The master station centralized feeder automation simulation platform of claim 3, wherein: the three ring main units (X, Y, Z) are respectively corresponding to four branches (X1-X4, Y1-Y4, Z1-Z4);
the ring main unit simulation circuit breaker (206) is provided with three groups corresponding to three ring main units (X, Y and Z), namely an X ring main unit simulation circuit breaker (206a), a Y ring main unit simulation circuit breaker (206b) and a Z ring main unit simulation circuit breaker (206 c); each looped network cabinet simulation circuit breaker (206) is correspondingly connected with four branches (X1-X4, Y1-Y4, Z1-Z4) of each looped network cabinet (X, Y, Z) through four power distribution ports on the circuit breaker;
the ring main unit data transmission units (204) corresponding to the three groups of ring main unit simulation 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 (204 c); the distribution network dispatching automation master station system (102) is connected to the three-group ring main unit data transmission unit (204) through the second front-end switch (104).
5. The master station centralized feeder automation simulation platform of any of claims 1, 2 or 4, wherein: and the main network dispatching automation master station system (101) and the distribution network dispatching automation master station system (102) both adopt PCS 9000.
6. The master station centralized feeder automation simulation platform 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 substation remote terminal unit (201);
the substation remote terminal unit (201) is used for acquiring displacement information of the line simulation circuit breaker (205) and uploading the displacement information and line (L1, M1, N1) protection action information from the line 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 power transmission recovery operation, a remote control command is forwarded to the main network dispatching automation master station system (101) from the distribution network dispatching automation master station system (102), 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 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 acquiring overcurrent alarm information and ring main unit simulated circuit breaker (206) displacement information of each branch of the ring main unit (X, Y, Z), and uploading the acquired 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 recover power transmission operation, a remote control command is issued from the distribution network dispatching automation master station system (102) to the outlets of three ring main unit data transmission units (204) for execution;
the data information forwarding adopts 104 protocols.
7. The master station centralized feeder automation simulation platform of claim 6, wherein: when a permanent fault occurs in a line (L1, M1, N1), the line protection measurement and control device (203) controls the line to trip, after the fault current recovers in the setting time, reclosing action is carried out, a line switch is closed, if the fault current is detected again, the protection action is carried out and the line switch trips again, the permanent fault occurs in the line; the substation remote terminal unit (201) uploads the protection action information of the lines (L1, M1 and N1) and the displacement information of the line simulation circuit breaker (205) generated in the process to the main network dispatching automation main station system (101) and then forwards the protection action information and the displacement information to the distribution network dispatching automation main station system (102);
fault current flows through each branch of the ring main units (X, Y, Z), if one branch of a certain ring main unit exceeds a current fixed value and a time fixed value of an overcurrent alarm, the ring main unit data transmission unit (204) can upload 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) positions the position of the fault according to the collected overcurrent alarm information, remotely pulls the ring main unit simulation circuit breaker (206) closest to the fault point away to isolate the fault area, closes the circuit simulation circuit breaker (205) or the ring main unit simulation circuit breaker (206) through topology analysis and remote operation, and recovers the power supply of the non-fault area.
8. The master station centralized feeder automation simulation platform of claim 2, wherein: four power distribution ports of the ring main unit simulated circuit breaker (206) have the same structure and adopt binding posts (300);
the wiring terminal (300) comprises a shell frame (301), an electric connecting piece (302) arranged in the shell frame (301) and one end of the electric connecting piece extending out of the shell frame (301), a force transmission piece (303) arranged on the side edge of the electric connecting piece (302), and a screw (304) which is connected to the side edge of the shell frame (301) through thread fit and can push the force transmission piece (303) inwards;
a threading opening (301a) 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 electric connecting piece (302) comprises a steering head (302a), a connecting part (302b) fixed at the outer end of the steering head (302a), and an electric connecting piece (302c) fixed at the outer end of the connecting part (302 b); the direction changing head (302a) is provided with a notch (302a-1) facing the threading opening (301 a);
the force transmission piece (303) is arranged inside the shell frame (301) in a sliding mode, and the sliding direction of the force transmission piece is perpendicular to the orientation of the notch (302 a-1);
the electric wire (X) can extend into the edge of the notch (302a-1) after penetrating into the shell frame (301) from the threading opening (301a), and is reversely bent under the guidance of the profile of the notch (302a-1) to form a bent section (X-1); the screw (304) can push the force transmission piece (303), the inner end of the wire (X) can be extruded by the force transmission piece (303), the wire (X) is close to the bending section (X-1) and is subjected to outward convex deformation at the turning part (X-2) of the bending section (X-1), and the turning head (302a) is pressed on the inner side wall of the shell frame (301) by utilizing the deformed turning part (X-2).
9. The master station centralized feeder automation simulation platform of claim 8, wherein: the binding post (300) further comprises a limiting piece (305) arranged opposite to the electric connecting piece (302);
the limiting piece (305) is positioned at one corner in the shell frame (301), and comprises a first external extending plate (305a) extending to a position between the diversion head (302a) and the interlayer of the shell frame (301), and further comprises a second external extending plate (305b) extending to a position between the inner end of the electric wire (X) and the bent section (X-1) thereof;
one side of the second overhanging plate (305b) corresponding to the bending section (X-1) is provided with a step surface (305c) opposite to the end of the bending section (X-1).
10. The master station centralized feeder automation simulation platform of claim 8 or 9, wherein: the force transmission piece (303) comprises a force bearing part (303a) and an extrusion block (303b) fixed on the force bearing part (303 a);
a pressure groove (303a-1) which is right opposite to the inner end of the screw (304) is formed in the center of the stress part (303a), a pair of accommodating grooves (303a-2) are symmetrically formed in two sides of the pressure groove (303a-1), a tension spring (306) is fixed in each accommodating groove (303a-2), and the other end of each tension spring (306) is fixed on the inner side wall of the shell frame (301);
the extrusion block (303b) faces the second overhanging plate (305b) and is provided with a flexible convex tooth (303b-1) at the tail end, and the tail end of the flexible convex tooth (303b-1) faces the notch (302a-1) of the steering head (302 a).
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