CN117254476A - Power distribution network accurate load shedding method and system based on real-time network topology tracing - Google Patents

Power distribution network accurate load shedding method and system based on real-time network topology tracing Download PDF

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Publication number
CN117254476A
CN117254476A CN202310776621.8A CN202310776621A CN117254476A CN 117254476 A CN117254476 A CN 117254476A CN 202310776621 A CN202310776621 A CN 202310776621A CN 117254476 A CN117254476 A CN 117254476A
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China
Prior art keywords
switch
intelligent terminal
real
topology
terminal unit
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CN202310776621.8A
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Chinese (zh)
Inventor
张健磊
秦志龙
杨超
芮树玲
史先好
齐仁磊
王黎
刘鹏
鞠雪强
刘玡朋
孙小涵
张振
文玉杰
牛欢
王超
姚福宾
赵斌
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QINGDAO POWER SUPPLY Co OF STATE GRID SHANDONG ELECTRIC POWER Co
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QINGDAO POWER SUPPLY Co OF STATE GRID SHANDONG ELECTRIC POWER Co
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Priority to CN202310776621.8A priority Critical patent/CN117254476A/en
Publication of CN117254476A publication Critical patent/CN117254476A/en
Pending legal-status Critical Current

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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention provides a method and a system for precisely cutting loads of a power distribution network based on real-time network topology tracing, wherein the method comprises the following steps: identifying the network topology of the power distribution network in real time based on an autonomous query mode of the intelligent terminal unit; forming a topology tree consisting of connection relations of an upper-level substation, a main line and a sequence table demarcation switch by utilizing an intelligent terminal unit relay query and queried intelligent terminal unit direct response mechanism, and determining the tangential capacity of a substation, namely a power supply area; based on the determined cut-off capacity of the power supply area, the local dispatching EMS remote control is issued to the dispatching (county) dispatching DMS, and the cut-off capacity is executed by the remote control of the main and dispatching network switches.

Description

Power distribution network accurate load shedding method and system based on real-time network topology tracing
Technical Field
The invention belongs to the technical field of power system monitoring and control, and particularly relates to a method and a system for accurately cutting loads of a power distribution network based on real-time network topology tracing.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Under the conditions of insufficient power balance, equipment overload and the like caused by serious faults of the power grid, the accurate and rapid removal of the non-civil controllable loads of the whole power grid and the local power grid is realized by remotely controlling the distribution network by batch remote control of various remote control equipment, and the influence on civil electricity is minimized while the safe and stable operation of the power grid is ensured. When load pulling in the whole area range is initiated by the ground call, the EMS system screens the main network and the distribution network equipment information of the parameter control from the pulling control sequence position of the main distribution network mixed arrangement. However, the real-time state (demarcation switch state, controllable state, current load value, corresponding relation between the feeder line and the main network equipment) of the power distribution network is changed under the influence of power utilization clients, power overhaul work or emergency accidents, so that the effectiveness of the accurate load shedding system is affected.
Therefore, the real-time state of the power distribution network is not considered in the current load shedding process, so that real-time accurate load shedding cannot be achieved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the accurate load shedding method for the power distribution network based on real-time network topology tracing, which can achieve real-time accurate load shedding.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, a method for precisely cutting loads of a power distribution network based on real-time network topology tracing is disclosed, which comprises the following steps:
identifying the network topology of the power distribution network in real time based on an autonomous query mode of the intelligent terminal unit;
forming a topology tree formed by connection relations of a transformer substation, a main line and a sequence table demarcation switch by utilizing an intelligent terminal unit relay query and queried intelligent terminal unit direct response mechanism, and determining the tangential capacity of the transformer substation, namely a power supply area;
based on the determined cut-off capacity of the power supply area, the local dispatching EMS remote control is issued to the dispatching (county) dispatching DMS, and the cut-off capacity is executed by the remote control of the main and dispatching network switches.
As a further technical solution, before the network topology of the power distribution network is identified in real time based on the autonomous query mode of the intelligent terminal unit, the method further includes:
the distribution (county) dispatching DMS uploads the data of the pull-path sequence table model to the local dispatching EMS to generate a main distribution network mixing sequence table;
and configuring the application topology type required to be provided based on the switch attribute of the local switch and the name and address information of the adjacent switch of the local switch by the intelligent terminal unit.
As a further technical scheme, the method for identifying the network topology of the power distribution network in real time based on the autonomous query mode of the intelligent terminal unit specifically comprises the following steps:
the main control intelligent terminal unit sends an adjacent switch state query request to the intelligent terminal unit at the adjacent switch, and the adjacent intelligent terminal unit forwards the query request when the local switch is in the closed position until the substation line outlet switch is queried.
As a further technical solution, the constructed topology tree specifically includes:
the intelligent terminal unit receiving the inquiry command returns the information of the monitored switch to the inquirer, and forwards the inquiry command to the next-stage adjacent switch, and the next-stage adjacent switch directly returns the information of the monitoring switch to the main control intelligent terminal unit until the inquiry is carried out to the terminal switch, and the main control intelligent terminal unit obtains a feeder line real-time topology tree according to all the returned information.
As a further technical scheme, after the remote control of the main and distribution network switches is performed and the capacity is cut, the local area main and distribution network control result information is summarized and displayed by the local Energy Management System (EMS).
As a further technical scheme, the pull sequence list model data mainly comprises sequence numbers, distribution switch IDs, distribution switch names, distribution line IDs, distribution line names, main network load IDs and main network load names.
As a further technical solution, based on the switch attribute of the local switch and the name and address information of the adjacent switch, the intelligent terminal unit configures the application topology type to be provided, which specifically includes:
configuring the switching attribute of each local switch and the name and address information of the adjacent switch, and the application topology type required to be provided;
the switch attribute of each local switch comprises a self attribute and a position attribute; the self attribute refers to the switch type and the switch remote signaling value, and the position attribute refers to the network address information of the intelligent terminal unit.
In a second aspect, a precise load shedding system for a power distribution network based on real-time network topology tracing is disclosed, comprising:
a network topology real-time identification module configured to: identifying the network topology of the power distribution network in real time based on an autonomous query mode of the intelligent terminal unit;
a cutable capacity determination module configured to: forming a topology tree formed by connection relations of an upper-level substation, a main line and a sequence table demarcation switch by utilizing an intelligent terminal unit relay query and queried intelligent terminal unit direct response mechanism, and determining the tangential capacity of the upper-level substation, namely a power supply area;
a cutable capacity execution module configured to: based on the determined cut-off capacity of the power supply area, the local dispatching EMS remote control is issued to the dispatching (county) dispatching DMS, and the cut-off capacity is executed by the remote control of the main and dispatching network switches.
According to the technical scheme, the load is precisely cut off for the power distribution network based on real-time network topology tracing, and a distribution (county) dispatching DMS (digital subscriber management system) uploads the data of the pull-up route sequence table model to a local dispatching EMS (event management system) to generate a main distribution network mixed sequence bit. Then, based on the switch attribute of the local switch and the name and address information of the adjacent switch, the application topology type needing to be provided is configured; the main control ITU firstly sends out a network topology inquiry command to the adjacent switch, the ITU receiving the inquiry command returns the information of the monitored switch and the address information of the adjacent switch to the inquirer, after the control main body receives the returned information, the topology inquiry command is sent to the address of the next adjacent switch contained in the returned information, and so on until the returned information indicates that the inquired switch is a terminal switch, and the main control ITU obtains a three-level real-time topology tree of an upper-level substation-10 kV main line-sequence list demarcation switch according to all the returned information. After confirmation, issuing a control execution instruction to remotely control the main network parameter control switch to switch off, simultaneously sending parameter control distribution network demarcation switch information to a distribution (county) distribution and distribution DMS system through a physical isolation device, decomposing the distribution (county) distribution and distribution DMS system to corresponding distribution (county) distribution and distribution according to the responsibility area of the demarcation switch, and respectively executing remote control switching off. After the remote control brake opening of the main and distribution network switches is completed, the local area main and distribution network control result information is summarized by the local dispatching EMS system. Through verification in a test system, the method can realize automatic topology tracing of the EMS system in real time, thereby really achieving accurate control load.
The one or more of the above technical solutions have the following beneficial effects:
according to the technical scheme, the method for carrying out real-time topology tracing by the intelligent power distribution terminal is used for determining the main network and the distribution network control sequence list, so that the load is precisely cut off. The topological circuit where the load to be controlled is located is obtained in real time, so that the upper power supply where each load is located is determined, the aim of accurately controlling the load is really achieved, the risk of stable damage of the system is reduced, and the safe operation of the power grid is ensured.
According to the technical scheme, through a topology tracing function, the automatic topology of the 10kV line and the distribution network feeder line of the main network is traced to a corresponding upper-level substation, and a load quick-pull function taking a substation (power supply area) as a control unit is realized.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flow chart of a precise load shedding method of a power distribution network based on real-time network topology tracing;
FIG. 2 is a diagram showing the interactive format of the distribution (county) scale DMS uploading the pull-way sequence table model data to the local scale EMS;
FIG. 3 is a cable overhead hybrid line topology;
FIG. 4 is an explanatory diagram of a topology information query-feedback mechanism;
FIG. 5 is a real-time three-level topology tree identification result for the left line cable tie switch of the overhead line cable;
FIG. 6 is an illustration of a topology addition of a sectionalizer;
FIG. 7 is an interface response test chart;
FIG. 8 is a diagram of a visual interface for a test execution process.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
The communication technology is rapidly developed, the 5G data communication is commercialized, and the advantages of high reliability and low time ductility lay a solid foundation for real-time topology tracing. According to the technical scheme of the embodiment, a real-time topology tracing method is used for determining a main network and a distribution network control sequence list by using the intelligent power distribution terminal based on 5G, so that the load is precisely cut off.
Term interpretation: ITU: intelligent terminal unit, an intelligent terminal unit.
Example 1
As shown in fig. 1, this embodiment discloses a method for accurately cutting loads of a power distribution network based on real-time network topology tracing, including:
firstly, distributing (county) dispatching DMS to upload the data of the pull-path sequence list model to local dispatching EMS to generate a main distribution network mixed sequence list.
The distribution network control sequence list is maintained in the DMS database by a distribution (county) dispatching master station personnel, the distribution network control sequence list in the distribution (county) dispatching DMS is uploaded to the local dispatching EMS through transverse isolation and is analyzed, the main network obtains distribution network drawing sequence list model data, and the main network data and the distribution network data are together compiled into the main network mixing sequence list.
The specific contents of the pull sequence table model data are serial numbers, switch names, belonging lines, belonging stations, whether controllable, load types and the like.
The application topology type that needs to be present is then configured based on the switch attributes of the local switch and the name and address information of its neighboring switches by the ITU.
The main control ITU firstly sends out a network topology inquiry command to the adjacent switch, the ITU which receives the inquiry command returns the information of the monitored switch and the address information of the adjacent switch to the inquirer, and after the control main body receives the returned information, the control main body sends out the topology inquiry command to the address of the next adjacent switch contained in the returned information, and so on until the returned information indicates that the inquired switch is a terminal switch.
And the main control ITU obtains a three-level real-time topology tree of the upper-level substation-10 kV main line-sequence table demarcation switch according to all the returned information.
According to the real-time topology tree, the automatic topology of the main network 10kV line and the distribution network feeder line is traced to the corresponding upper-level substation, and the tangent capacity of each substation can be automatically calculated.
And according to the switchable capacity of each transformer substation, a dispatcher selects a plurality of transformer substations to ensure that the total switchable capacity is larger than the switching load target value.
After confirmation, issuing a control execution instruction to remotely control the main network parameter control switch to switch off, simultaneously sending parameter control distribution network demarcation switch information to a distribution (county) distribution and distribution DMS system through a physical isolation device, decomposing the distribution (county) distribution and distribution DMS system to corresponding distribution (county) distribution and distribution according to the responsibility area of the demarcation switch, and respectively executing remote control switching off.
After the remote control brake opening of the main and distribution network switches is completed, the local area main and distribution network control result information is summarized by the local dispatching EMS system.
The land control energy management system EMS system analyzes the parameter control demarcation switch and the feeder real-time data file sent by the distribution power distribution management system DMS system, and automatically updates the demarcation switch state, the controllable state, the current load value and the corresponding relation between the affiliated feeder and the main network equipment.
During the data acquisition, the EMS can obtain the real-time state, the controllable state, the current load value and the corresponding relation between the affiliated feeder line and the main network equipment of the demarcation switch by analyzing the parameter-control demarcation switch and the feeder line real-time data file sent by the distribution (county) dispatching DMS.
For the remote control execution command that the county dispatching is not started, after the control waiting timeout time, the dispatching (county dispatching) DMS ends the control sequence and feeds back to the end of the EMS system control process.
Specifically, the distribution (county) key DMS transmits all records in the pull sequence table to the EMS in the format shown in fig. 2.
The current load of the distribution network switch is calculated to determine the real-time load of each switch, so that the real-time switchable load capacity of the upper-level substation can be conveniently obtained according to the topology tree, and the current load of the distribution network switch is calculated: the active power collected by the ITU is directly used, and for a demarcation switch which does not adopt the active power, the calculated value of the formula (1) is adopted for uploading:
wherein the power factor isTaking 0.98, the voltage U is 10kv, and the phase a current real-time value is taken as i, i.e. active p=1.732×10×0.98×a current amplitude.
Judging the controllable state of the switch: judging whether the switch has a remote control point number channel, whether the card is hung to prohibit remote control, whether the remote signaling state is normal, whether the terminal is controllable and the like. Specifically, if the switch has a remote control point number, a 'forbidden remote control' card is not hung, the remote signaling state is normal and the terminal is controllable, the switch is controllable, and the load of the switch can be cut off.
The main distribution network mixed sequence bit table model data mainly comprises sequence numbers, distribution switch IDs, distribution switch names, distribution line IDs, distribution line names, main network load IDs, main network load names and the like. The main network obtains the distribution network pull sequence bit table model data, and the main network and the distribution network data are compiled into a main distribution network mixed sequence bit table.
Switches can be classified into an outgoing line switch, a main line switch and a demarcation switch according to the positions of the switches in the topology.
Regarding the outlet switch: refers to a line outlet circuit breaker connected to a bus in a substation.
Regarding the mains switch: refers to an on-pole switch on a main line and an incoming line switch in a ring main unit, and both sides of the on-pole switch and the incoming line switch can obtain power. The main line switch is further divided into a sectionalizer and a tie switch according to the switching property. The sectionalizing switch is used for sectionalizing the circuit; the interconnecting switch is in a switching-off state during normal operation, and the sectionalizing switch trips to isolate faults when the faults occur, so that the interconnecting switch is switched on to recover power supply of a non-fault section.
Regarding the demarcation switch: the column switch on the branch line and the non-incoming line switch in the ring main unit can obtain power supply only at one side, are topologically connected with the power customer, and the customer electricity load is the switch cut load.
To achieve real-time identification of the network topology, it is necessary for the ITU to know the topology information of its monitoring switch. In ITU, the switch attribute (including self attribute and location attribute) of each local switch, the name and address information of its adjacent switch, and the type of application topology to be provided are configured. The self attribute refers to the switch type (outgoing line switch, trunk line switch and demarcation switch) and the switch remote signaling value, and the position attribute refers to ITU network address information.
Taking the cable overhead hybrid line shown in fig. 3 as an example, QS1 and QS2 are power switches; q1, Q3, K4H01, K4H02, K5H01, K5H02, K6H01, K6H02 are trunk switches, wherein K6H02 is in a normally open position and is a tie switch; q2, K4H03, K4H04, K4H05, K4H06, K5H03, K5H04, K5H05, K5H06, K6H03, K6H04, K6H05, K6H06 are demarcation switches.
In this embodiment, the switching information configured for ITU has 3 parts:
(1) The name and number of the local switch monitored by the ITU. The switch names and numbers are unique in the distribution automation system and are not repeated with other switch numbers. If the local switch to be monitored is a pole switch, there is only one local switch, and for the ring main unit (switching station), there are at least a plurality of local switches, typically 6. Taking fig. 3 as an example, the monitoring object of ITU1-ITU3 is a pole-mounted switch, and the local switch is only one; whereas for ITU4-ITU6 the monitoring object is a ring main unit, the local switch has 2 main line (incoming line) switches and 4 demarcation switches.
(2) The nature of the local switch, i.e. whether the local switch is an outlet switch, a mains switch or a demarcation switch.
(3) The topology adjacent switch information is that each local switch is configured with the name number of the topology adjacent switch and the communication address of the ITU configured with the switch information. Taking fig. 3 as an example, the switches adjacent to the left side of Q3 are Q1 and Q2, and their switch information is respectively monitored by ITU1 and ITU 2; the switch adjacent to the right is K4H01, the switch information of which is in ITU 4. For switch K4H02, the switches adjacent to the left are K4H01, K4H03-K4H06, and the switch information is in ITU 4; the switch K5H01 adjacent to the right has its switch information set in ITU5.
The working principle of applying ITU autonomous query to identify real-time network topology is as follows:
(1) The ITU making control decision firstly sends a query request of the state of the adjacent switch to the ITU at the adjacent switch, and the ITU at the adjacent switch returns the state information of the local switch;
(2) If the queried local switch is a trunk switch and is in position, forwarding a query request by the adjacent ITU;
(2) If the queried local switch is a trunk switch and is split, the query is not forwarded downwards;
(3) If the queried local switch is a demarcation switch, the query is not forwarded downwards no matter whether the switch remote signaling is a split or a closed position;
(4) If the queried local switch is an outgoing line switch, automatically matching the superior power substation corresponding to the feeder line to which 10kV belongs according to the corresponding relation between the feeder line to which the feeder line belongs and the main network equipment obtained in the step one, and completing the autonomous query and identification of the real-time network topology.
For overhead lines, the monitored object of the ITU is a pole-mounted switch, with only one local switch. If the monitored object of the ITU is a ring main unit in a cable line, the ring main unit is configured with information of a plurality of local switches, and the information of the local switches and adjacent switches may be stored in the same ITU. In this case, the ITU monitoring the local switch does not need to communicate with the neighboring ITU to obtain information of the neighboring switch.
The topology information query process sets the principles of ITU relay query and queried ITU direct response mechanism as follows: the master control STU firstly sends out a network topology inquiry command to the topology adjacent switch, the STU which receives the inquiry command returns the information of the monitored switch to the inquirer and forwards the inquiry command to the next topology adjacent switch, the next topology adjacent switch directly returns the information of the monitoring switch to the master control ITU and continues to forward the topology inquiry command to the adjacent switch, the inquiry process is the same until the inquiry is carried out to the terminal switch, and the master control STU obtains the feeder line real-time topology according to all the returned information. The topology information query-feedback mechanism is shown in fig. 4.
The main control ITU1 sends out inquiry commands with serial numbers of 1 and 2 to the topology adjacent ITU2 and ITU3 respectively, and the ITU2 and ITU3 send out return information 3 and 4 to the main control ITU1 respectively. ITU2 issues query commands with sequence numbers 5 and 6 to topology adjacent ITU4 and ITU5, respectively, and ITU4 and ITU5 issue return information 8 and 9 to master ITU1, respectively. ITU3 issues a query command with sequence number 7 to topology adjacent ITU6, respectively, and ITU6 issues return information 10 to master ITU1, respectively. ITU4 issues a query command with sequence number 11 to topology adjacent ITU7, respectively, and ITU7 issues return information 13 to master ITU 1. ITU6 issues a query command with sequence number 12 to topology adjacent ITU8, and ITU8 issues return information 14 to master ITU1, respectively.
In the following, taking the line of fig. 3 as an example, how the ITU4 making the control decision performs real-time network topology tracing. Let ITU4 be the master ITU. Firstly, when the ITU4 is powered on and put into operation for the first time, starting a real-time network topology query, which comprises the following specific steps:
the ITU4 can monitor 6 local switches of the ring main unit K4 and firstly send a switch state query request to ITU3 and ITU5 where Q3 and K5H01 switches with adjacent topology of the ring main unit K4 are located;
after receiving the query request, ITU3 returns information that the switch Q3 is in the closed position to the main control ITU4, and forwards the query request of ITU4 to ITU1 and ITU2 with adjacent topologies; after receiving the inquiry request, ITU5 returns information that switch K5H01-K5H02 is in the in-place position to main control ITU4, and forwards the inquiry request of ITU4 to its adjacent ITU 6. Returning the switch states of the switches K5H03-K5H06 and the information of the end switch to the main control ITU 4;
the ITU1 returns the information that the switch 1 is in the closed position and is an outgoing switch after receiving the query request, and the ITU2 returns the information that the switch 2 is in the closed position and is an end switch to the main control ITU4 after receiving the query request.
The return K6H01 after ITU6 receives the query request is a trunk switch and the information in bits is no longer forwarding the query request down. Returning information such as the switch states and the switch types of the switches K6H02-K6H06 to the main control ITU 4;
and obtaining the three-level real-time topological tree relationship of the upper-level substation-10 kV main line-sequence table demarcation switch of the left-side line of the tie switch through autonomous query, wherein the three-level real-time topological tree relationship is shown in figure 5.
For medium voltage distribution networks, the topology and the manner of operation often change. The master ITU will monitor the deflection information of all switches in the feeder real-time topology in real time. And once the switch deflection information in the feeder line real-time topology is received, the switch state is updated and the feeder line real-time topology information is refreshed, and no manual participation is needed. If the network static topology changes due to the abnormal movement of the power grid equipment, such as a new ring main unit and a pole switch, the new switch needs to be manually configured, the configuration information of all switch stations adjacent to the new switch topology is manually updated, and other switch configuration information is unchanged. For example, as shown in fig. 6, a segment switch K9 is newly added at a point a between a switch K5 and a switch K6, and only the site where the switch K9 is located needs to be manually configured, and configuration information of the sites of K5 and K6 is updated.
The remote preset test of the pull sequence switch is performed in the local call EMS and the distribution (county) call DMS system, and the interface response test is shown in figure 7. The method comprises the steps of inputting a target cut load value 468.301MW (main network load 398.019MW and distribution network load 70.282 MW), selecting a task type (remote control preset), and selecting a responsibility area for generating a task. According to the method, a main distribution network pull sequence bit scheme is generated according to the pull sequence bit table and the equipment controllable state. After entering a preset interface, checking whether the transformer substation, the line, the switch name and the switch state of the equipment to be preset are correct or not, if so, clicking a preset task without problems. And returning a preset result, namely 255 main network switch test switches, 336 distribution network switch test switches, and 336 distribution network switch test switches, wherein the preset load value is 468.301MW, and the control process of the ground control EMS system is finished, and the time is 559.3s, so that the accurate load shedding test is accurately completed. The test execution visualization interface is shown in fig. 8.
Example two
It is an object of the present embodiment to provide a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the above method when executing the program.
Example III
An object of the present embodiment is to provide a computer-readable storage medium.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
Example IV
The purpose of this embodiment is to provide a precise load shedding system of distribution network based on real-time network topology traceback, including:
a network topology real-time identification module configured to: identifying the network topology of the power grid in real time based on an autonomous query mode of the intelligent terminal unit;
a cutable capacity determination module configured to: forming a topology tree formed by connection relations of a transformer substation, a main line and a sequence table demarcation switch by utilizing an intelligent terminal unit relay query and queried intelligent terminal unit direct response mechanism, and determining the tangential capacity of the transformer substation, namely a power supply area;
a cutable capacity execution module configured to: based on the determined cut-off capacity of the power supply area, the local dispatching EMS remote control is issued to the dispatching (county) dispatching DMS, and the cut-off capacity is executed by the remote control of the main and dispatching network switches.
The steps involved in the devices of the second, third and fourth embodiments correspond to those of the first embodiment of the method, and the detailed description of the embodiments can be found in the related description section of the first embodiment. The term "computer-readable storage medium" should be taken to include a single medium or multiple media including one or more sets of instructions; it should also be understood to include any medium capable of storing, encoding or carrying a set of instructions for execution by a processor and that cause the processor to perform any one of the methods of the present invention.
It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented by general-purpose computer means, alternatively they may be implemented by program code executable by computing means, whereby they may be stored in storage means for execution by computing means, or they may be made into individual integrated circuit modules separately, or a plurality of modules or steps in them may be made into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.

Claims (10)

1. The accurate load shedding method of the power distribution network based on real-time network topology tracing is characterized by comprising the following steps:
identifying the network topology of the power distribution network in real time based on an autonomous query mode of the intelligent terminal unit;
forming a topology tree consisting of connection relations of an upper-level substation, a main line and a sequence table demarcation switch by utilizing an intelligent terminal unit relay query and queried intelligent terminal unit direct response mechanism, and determining the tangential capacity of a substation, namely a power supply area;
based on the determined cut-off capacity of the power supply area, the local dispatching EMS remote control is issued to the distribution or county dispatching DMS, and the cut-off capacity is executed by the remote control of the main distribution network switch.
2. The precise load shedding method for the power distribution network based on real-time network topology tracing of claim 1, further comprising, before the network topology of the power distribution network is identified in real time based on the autonomous query mode of the intelligent terminal unit:
the distribution or county dispatching DMS uploads the pulling route sequence table model data to the local dispatching EMS to generate a main distribution network mixing sequence table;
and configuring the application topology type required to be provided based on the switch attribute of the local switch and the name and address information of the adjacent switch of the local switch by the intelligent terminal unit.
3. The precise load shedding method for the power distribution network based on real-time network topology tracing of claim 1, wherein the method for identifying the network topology of the power distribution network in real time based on an autonomous query mode of an intelligent terminal unit specifically comprises the following steps:
the main control intelligent terminal unit sends an adjacent switch state query request to the intelligent terminal unit at the adjacent switch, and the adjacent intelligent terminal unit forwards the query request when the local switch is in the closed position until the substation line outlet switch is queried.
4. The accurate load shedding method for the power distribution network based on real-time network topology tracing of claim 1, wherein the constructed topology tree specifically comprises:
the intelligent terminal unit receiving the inquiry command returns the information of the monitored switch to the inquirer, and forwards the inquiry command to the next-stage adjacent switch, and the next-stage adjacent switch directly returns the information of the monitoring switch to the main control intelligent terminal unit until the inquiry is carried out to the terminal switch, and the main control intelligent terminal unit obtains a feeder line real-time topology tree according to all the returned information.
5. The accurate load shedding method for the power distribution network based on real-time network topology tracing of claim 1, wherein after the remote control switching-off of the main and distribution network switches is completed and the switchable capacity is achieved, the local area main and distribution network control result information is summarized and displayed by the local dispatching EMS system.
6. The method for precisely cutting load of power distribution network based on real-time network topology tracing as recited in claim 2, wherein said master network mixed order table model data mainly comprises order sequence number, distribution switch ID, distribution switch name, distribution line ID, distribution line name, master network load ID and master network load name.
7. The accurate load shedding method of the power distribution network based on real-time network topology tracing of claim 1, wherein the method is based on the intelligent terminal unit to configure the switching attribute of the local switch, the name and address information of the adjacent switch and the application topology type to be provided, and specifically comprises the following steps:
configuring the switching attribute of each local switch and the name and address information of the adjacent switch, and the application topology type required to be provided;
the switch attribute of each local switch comprises a self attribute and a position attribute; the self attribute refers to the switch type and the switch remote signaling value, and the position attribute refers to the network address information of the intelligent terminal unit.
8. Accurate load system of cutting of distribution network based on real-time network topology tracebacks, characterized by including:
a network topology real-time identification module configured to: identifying the network topology of the power grid in real time based on an autonomous query mode of the intelligent terminal unit;
a cutable capacity determination module configured to: forming a topology tree formed by connection relations of a transformer substation, a main line and a sequence table demarcation switch by utilizing an intelligent terminal unit relay query and queried intelligent terminal unit direct response mechanism, and determining the tangential capacity of the transformer substation, namely a power supply area;
a cutable capacity execution module configured to: based on the determined cut-off capacity of the power supply area, the local dispatching EMS remote control is issued to the distribution or county dispatching DMS, and the cut-off capacity is executed by the remote control of the main distribution network switch.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of the preceding claims 1-7 when the program is executed by the processor.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, performs the steps of the method of any of the preceding claims 1-7.
CN202310776621.8A 2023-06-28 2023-06-28 Power distribution network accurate load shedding method and system based on real-time network topology tracing Pending CN117254476A (en)

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