CN104578065A - Loop closing control method of distribution intelligent collecting switching device - Google Patents
Loop closing control method of distribution intelligent collecting switching device Download PDFInfo
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- CN104578065A CN104578065A CN201510046973.3A CN201510046973A CN104578065A CN 104578065 A CN104578065 A CN 104578065A CN 201510046973 A CN201510046973 A CN 201510046973A CN 104578065 A CN104578065 A CN 104578065A
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- switching device
- load
- cyclization
- white iron
- distribution intelligent
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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
-
- 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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a loop closing control method of a distribution intelligent collecting switching device. The loop closing control method includes calculating loop closed current of a looped network generated after loop closing; judging whether or not the loop closed current meets the requirement, if yes, performing loop closing, and if not, assuming that load transfer is performed to transfer a connection part of a bus for loop closing to other buses in the load manner, once the load is transferred, the theoretic loop closed current after the transfer is calculated until the loop closed current meets the requirement, thus the transfer scheme is formed; implementing the load transfer according to the transfer scheme, once the load is transferred, the actual loop closed current after transfer is calculated, if the actual loop closed current meets the theoretic loop closed current, keeping implementing the load transfer, and if not, re-calculating the theoretic loop closed current after the load transfer in the residual transfer scheme and correcting and implementing the transfer scheme until the actual loop closed current meets the requirement. According to the arrangement, the loop closing is controlled, load is adjusted, and power supply reliability and continuty is guaranteed.
Description
Technical field
The invention belongs to low-voltage network loop-net operation cyclization condition and regulate field, particularly relating to a kind of cyclization control method of distribution intelligent acquisition switching device based on having load transfer ability.
Background technology
Along with the needs of the development of China intelligent grid and Urbanization Progress, city dweller's house high level and high-rise building significantly increase, the loads such as fire-fighting, elevator, water supply, draining reliability direct relation of powering of these buildings to the person and the property safety of resident, the Reliable guarantee of powering for this type load is also subject to increasing attention, becomes the important step weighing city power distribution planning and managerial skills.Following power distribution network loop-net operation will become development trend simultaneously; loop-net operation is adopted to become possibility as being directly connected to the low-voltage network of customer power supply reliability, low pressure important load uninterrupted power supply; but larger Alloy White Iron may be produced during cyclization; the malfunction of protection can be caused to trip, cause user to have a power failure, or damage equipment; cyclization failure; therefore before cyclization, need involutive ring electric current to calculate, Row sum-equal matrix of going forward side by side, can carry out smoothly to make cyclization.
Summary of the invention
When the object of the invention is to carry out cyclization under the ring network power supply condition that can improve electric reliability of powering, select suitable cyclization method, particularly when under employing multiple power supplies band outgoing lines condition, adjustment busbar voltage and then adjustment Alloy White Iron can be carried out by Load adjustment, cyclization is carried out.
For achieving the above object, the technical solution used in the present invention is:
A kind of cyclization control method of distribution intelligent acquisition switching device, described distribution intelligent acquisition switching device is connected with electrical network background management system and cyclization for controlling power distribution network, described power distribution network comprises n bar bus, the n root inlet wire connected one to one with described bus, the some outlets be connected with described bus, block switch is provided with between bus described in any two, described method is: the Alloy White Iron calculating the looped network formed after cyclization until two buses of cyclization, whether the Alloy White Iron described in judgement meets the demands, if, then perform Loop Closing Operation, if not, then hypothesis carries out load transfer plan, to treat that the sub-load that two buses of cyclization connect is transferred to other buses, often shift a load and then calculate the theoretical Alloy White Iron after once shifting, until Alloy White Iron meets the demands, the load shifted forms transfer scheme, described distribution intelligent acquisition switching device implements load transfer plan according to described transfer scheme, often shift a load and then calculate the actual Alloy White Iron after once shifting, if described actual Alloy White Iron conforms to described theoretical Alloy White Iron, then continue to implement load transfer plan according to described transfer scheme, if be not inconsistent, then recalculate the theoretical Alloy White Iron in remaining transfer scheme after load transfer plan according to actual Alloy White Iron and revise transfer scheme and implement, until actual Alloy White Iron meets the demands.
Described distribution intelligent acquisition switching device comprises and gathers the voltage of inlet wire and the current-voltage measurement module be connected with described electrical network background management system, to communicate the collection digital processing that also can export control signal and protection module, be connected with described collection digital processing and protection module and the switch control rule of block switch described in controlling according to described control signal and block of state with described electrical network background management system.
According to the state of described distribution intelligent acquisition switching device, in described background management system
Obtain the topological structure of place low-voltage network and carry out Region dividing, determine internal node, external node and boundary node, and carry out REI equivalence, obtain the equivalent node R of outside medium voltage network, the network after equivalence simplified, equivalent total impedance Z that equivalent transformation obtains the looped network needing two inlet wires carrying out cyclization to be formed
loop; Described background management system obtains the voltage difference of two inlet wire cyclization points by the current-voltage measurement module of described distribution intelligent acquisition switching device, the Alloy White Iron described in calculating.
Described current-voltage measurement module is voltage transformer.
Described collection digital processing and protection module have the ethernet interface module communicated with described electrical network background management system.
Described distribution intelligent acquisition switching device also comprises power module.
Because technique scheme is used, the present invention compared with prior art has following advantages: the present invention can involutive ring process control, and can carry out load adjustment, can ensure power supply reliability and continuity.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of cyclization control method of the present invention and distribution intelligent acquisition switching device.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: a kind of distribution intelligent acquisition switching device, comprise the current-voltage measurement module of the voltage gathering inlet wire, to be connected with described current-voltage measurement module also can communicate with described electrical network background management system with export the collection digital processing of control signal and protection module, be connected with described collection digital processing and protection module and the switch control rule of block switch described in controlling according to described control signal and block of state, power module for other energize portions.Wherein, described current-voltage measurement module is voltage transformer.And described collection digital processing and protection module have the ethernet interface module or RS485 interface module that communicate with described electrical network background management system.
Above-mentioned distribution intelligent acquisition switching device coordinates electrical network background management system to match execution cyclization control method to control the cyclization of power distribution network, the n root inlet wire that described power distribution network comprises n bar bus, connect one to one with described bus, the some outlets be connected with described bus, be provided with block switch between bus described in any two, described method is:
1, the Alloy White Iron of the looped network formed after cyclization until two buses of cyclization is calculated.According to the state of described distribution intelligent acquisition switching device, in described background management system, obtain the topological structure of place low-voltage network and carry out Region dividing, determine internal node, external node and boundary node, and carry out REI equivalence, obtain the equivalent node R of outside medium voltage network, the network after equivalence simplified, equivalent total impedance Z that equivalent transformation obtains the looped network needing two inlet wires carrying out cyclization to be formed
loop; Described background management system obtains the voltage difference of two inlet wire cyclization points by the current-voltage measurement module of described distribution intelligent acquisition switching device, the Alloy White Iron described in calculating.
Whether the Alloy White Iron 2, described in judgement meets the demands, if, then perform Loop Closing Operation, if not, then hypothesis carries out load transfer plan, will treat that the sub-load (insignificant load) that two buses of cyclization connect is transferred to other buses, often shifts a load and then calculates the theoretical Alloy White Iron after once shifting, until Alloy White Iron meets the demands, the load shifted forms transfer scheme; Described distribution intelligent acquisition switching device implements load transfer plan according to described transfer scheme, often shift a load and then calculate the actual Alloy White Iron after once shifting, if described actual Alloy White Iron conforms to described theoretical Alloy White Iron, then continue to implement load transfer plan according to described transfer scheme, if be not inconsistent, then recalculate the theoretical Alloy White Iron in remaining transfer scheme after load transfer plan according to actual Alloy White Iron and revise transfer scheme and implement, until actual Alloy White Iron meets the demands.
Specifically as shown in Figure 1; there is the functional module of the 400V distribution intelligent acquisition switching device of load transfer ability, comprise current/voltage acquisition module, gather digital processing and protection module, switch control rule and block of state, power module, Ethernet interface interface module.Device, by voltage current transformer (comprising voltage transformer 6 summation current transformer 7), can be obtained the electric current and voltage amount of each bar inlet wire, outlet, can be split simultaneously put line operate into by switch control rule and block of state, and feedback switch state.Gather in digital processing and protection module and establish data acquisition and signal processing structure, overcurrent protection structure and upper strata communication interface, i.e. Ethernet interface, can upload to background management system by the state of each switch of distribution intelligent acquisition switching device and line voltage, electric current and power information; Power module adopts the pattern that supplies power with double circuit, and is connected respectively, inside establishes rectification circuit, 400V alternating voltage is converted to D.C. regulated power supply, power continuously to whole device with 1#400V inlet wire with 2#400V inlet wire.
Fig. 1 shows the connected mode of line, different 400V inlet wire is connected on different bus section, busbar sections, and each bus section, busbar section is all with outgoing lines, and each outlet and each point intersegmentally all have connecting valve, can realize being connected with each segmentation, as the connected mode of 1,2 bus section, busbar section institute on-loads.
For ensureing that 3# inlet wire institute connects the ring network power supply of important outlet in line, need, by the block switch closed between 2,3 buses, to realize realizing looped network form by 2#, 3# inlet wire and power to outlet E, F, H, I.By 2#, 3# inlet wire cyclization process is: the medium voltage network information provided according to switching-state information and the intermediate distribution system automation equipment of the above-mentioned 400V distribution intelligent acquisition switching device feedback of installing in distribution, the topological structure of place low-voltage network is obtained in background management system, and carry out Region dividing, determine 2#, 3# inlet wire place power distribution network internal node, external node and boundary node, carry out REI equivalence, obtain the equivalent node R of outside medium voltage network, network after equivalence is simplified, equivalent transformation obtains 2#, the equivalent total impedance Z of the looped network that 3# inlet wire is formed
loop, by 2#, 3# voltage difference
according to formula
calculate Alloy White Iron.Whether verification Alloy White Iron meets cyclization requirement, if meet, sends and carries out Loop Closing Operation order, switch between distribution intelligent acquisition switching device closed 2,3 buses; 3# inlet wire institute on-load forms ring network power supply by by 2#, 3#.
If Alloy White Iron does not meet the demands, then carry out the transfer of load to regulate the voltage difference of cyclization point, by being with insignificant load transfer plan on all the other buses 2 buses or 3 buses, as 2 bus insignificant loads shift to 1 bus, the connecting valve disconnecting this load place outlet and 2 buses can be about to, the connecting valve of this load closed and 1# bus, also following load transfer plan process can be had: load transfers to 1 bus by 3 buses, load transfers to 3 buses by 2 buses, load transfers to 2 buses by 3 buses, concrete transfer scheme has background management system through Load flow calculation and obtains in conjunction with the sequence of load significance level, process for: traversal bus with the Switch State Combination in Power Systems of the insignificant load that can shift, the on off state of each change outlet, the 2# after often operating a load transfer plan in combination is obtained through Load flow calculation, 3# busbar voltage, and obtain theoretical Alloy White Iron, next outlet switch operation in combining after judgement, until theoretical Alloy White Iron meets the demands, select Alloy White Iron to meet the demands and minimum be combined to form load transfer plan scheme, and by the program and equiva lent impedance Z
loopbe sent to distribution intelligent acquisition switching device place.
Distribution intelligent acquisition switching device is according to the determined switching operation of transfer scheme and switching manipulation content, successively switching manipulation is carried out to each bar insignificant inlet wire, through transient-power failure, the bus that change needs the insignificant load place outlet of operation to connect, and after each transfer outlet, distribution intelligent acquisition switching device is according to real-time cyclization point both sides voltage difference and Z
loopcalculate actual Alloy White Iron, if consistent or close with the result of the theoretical Alloy White Iron of hind computation gained, then perform the transfer of lower bar outlet, otherwise, send request to background management system, again calculate the up-to-date load transfer sequence of outlet and shift direction that residue needs operation, and again return distribution intelligent acquisition switching device and carry out switching manipulation and verification; Cyclization is carried out when Alloy White Iron meets cyclization requirement.
Low pressure 400V switch monitors the running status of power supply, when arbitrary inlet wire fault, and when having an inlet wire for subsequent use, send instruction through time delay and export to logic control, open failure inlet wire, drop into stand-by power supply simultaneously, when adopting loop-net operation, arbitrary inlet wire fault, can disconnect this fault inlet wire, and judge to have other to form the path of annular electric supply to important load, if exist, submit backstage inlet wire Alloy White Iron verification to.Under forming ring network power supply condition at 2#, 3# inlet wire, if 2# fault, after disconnecting, ring network power supply is destroyed, but 1#, 2# inlet wire can form ring network power supply, then submit backstage inlet wire Alloy White Iron verification to.
Under fault mode or non-faulting pattern, continue to upload real-time sampling data and information to background monitoring system by Ethernet interface; When being received the instruction of the console switch that background monitoring system is assigned by Ethernet interface, switch state machine block of state controls in strict accordance with instruction.
Under present invention achieves many inlet wires outgoing lines condition, ring network power supply is intelligent, can involutive ring condition judge, and adopt load transfer plan mode to regulate cyclization point voltage poor, Alloy White Iron is made to reach the condition allowing cyclization, can detect multichannel inlet wire simultaneously, when there is inlet wire for subsequent use in a road inlet wire fault simultaneously, transfer a load onto inlet wire for subsequent use, restore electricity rapidly, if ring network power supply, after inlet wire fault, the adjustment of load can be carried out, the power supply of preferential guarantee important load, for improving Residential Area, particularly the power supply reliability of high residential building and continuity have profound significance.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (6)
1. the cyclization control method of a distribution intelligent acquisition switching device, described distribution intelligent acquisition switching device is connected with electrical network background management system and cyclization for controlling power distribution network, described power distribution network comprises n bar bus, the n root inlet wire connected one to one with described bus, the some outlets be connected with described bus, block switch is provided with between bus described in any two, it is characterized in that: described method is: the Alloy White Iron calculating the looped network formed after cyclization until two buses of cyclization, whether the Alloy White Iron described in judgement meets the demands, if, then perform Loop Closing Operation, if not, then hypothesis carries out load transfer plan, to treat that the sub-load that two buses of cyclization connect is transferred to other buses, often shift a load and then calculate the theoretical Alloy White Iron after once shifting, until Alloy White Iron meets the demands, the load shifted forms transfer scheme, described distribution intelligent acquisition switching device implements load transfer plan according to described transfer scheme, often shift a load and then calculate the actual Alloy White Iron after once shifting, if described actual Alloy White Iron conforms to described theoretical Alloy White Iron, then continue to implement load transfer plan according to described transfer scheme, if be not inconsistent, then recalculate the theoretical Alloy White Iron in remaining transfer scheme after load transfer plan according to actual Alloy White Iron and revise transfer scheme and implement, until actual Alloy White Iron meets the demands.
2. the cyclization control method of distribution intelligent acquisition switching device according to claim 1, is characterized in that: described distribution intelligent acquisition switching device comprises and gathers the voltage of inlet wire and the current-voltage measurement module be connected with described electrical network background management system, to communicate the collection digital processing that also can export control signal and protection module, be connected with described collection digital processing and protection module and the switch control rule of block switch described in controlling according to described control signal and block of state with described electrical network background management system.
3. the cyclization control method of distribution intelligent acquisition switching device according to claim 2, it is characterized in that: according to the state of described distribution intelligent acquisition switching device, in described background management system, obtain the topological structure of place low-voltage network and carry out Region dividing, determine internal node, external node and boundary node, and carry out REI equivalence, obtain the equivalent node R of outside medium voltage network, the network after equivalence simplified, equivalent total impedance Z that equivalent transformation obtains the looped network needing two inlet wires carrying out cyclization to be formed
loop; Described background management system obtains the voltage difference of two inlet wire cyclization points by the current-voltage measurement module of described distribution intelligent acquisition switching device, the Alloy White Iron described in calculating.
4. the cyclization control method of distribution intelligent acquisition switching device according to claim 2, is characterized in that: described current-voltage measurement module is voltage transformer.
5. the cyclization control method of distribution intelligent acquisition switching device according to claim 2, is characterized in that: described collection digital processing and protection module have the ethernet interface module communicated with described electrical network background management system.
6. the cyclization control method of distribution intelligent acquisition switching device according to claim 2, is characterized in that: described distribution intelligent acquisition switching device also comprises power module.
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| CN109193920A (en) * | 2018-09-26 | 2019-01-11 | 云南电网有限责任公司电力科学研究院 | A kind of cyclization tune electric control system and method based on controllable inductor |
| CN110672982A (en) * | 2019-11-14 | 2020-01-10 | 广东电网有限责任公司 | Detection method and system for preventing long-term loop closing operation of power distribution network and readable storage medium |
| CN111509709A (en) * | 2020-04-26 | 2020-08-07 | 贵州电网有限责任公司 | Power distribution network closed loop switching power supply current evaluation method based on closed current moment |
| CN111917110A (en) * | 2020-06-29 | 2020-11-10 | 国电南瑞南京控制系统有限公司 | Direct-current power distribution network loop closing and loop opening control method, system and storage medium |
| CN115189355A (en) * | 2022-09-08 | 2022-10-14 | 国网天津市电力公司城南供电分公司 | Snowflake grid type grid structure construction method and device for three-station six-line mode power distribution network |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193920A (en) * | 2018-09-26 | 2019-01-11 | 云南电网有限责任公司电力科学研究院 | A kind of cyclization tune electric control system and method based on controllable inductor |
| CN110672982A (en) * | 2019-11-14 | 2020-01-10 | 广东电网有限责任公司 | Detection method and system for preventing long-term loop closing operation of power distribution network and readable storage medium |
| CN111509709A (en) * | 2020-04-26 | 2020-08-07 | 贵州电网有限责任公司 | Power distribution network closed loop switching power supply current evaluation method based on closed current moment |
| CN111509709B (en) * | 2020-04-26 | 2021-11-26 | 贵州电网有限责任公司 | Power distribution network closed loop switching power supply current evaluation method based on closed current moment |
| CN111917110A (en) * | 2020-06-29 | 2020-11-10 | 国电南瑞南京控制系统有限公司 | Direct-current power distribution network loop closing and loop opening control method, system and storage medium |
| CN115189355A (en) * | 2022-09-08 | 2022-10-14 | 国网天津市电力公司城南供电分公司 | Snowflake grid type grid structure construction method and device for three-station six-line mode power distribution network |
| CN115189355B (en) * | 2022-09-08 | 2022-12-13 | 国网天津市电力公司城南供电分公司 | Snowflake grid type grid structure construction method and device for three-station six-line mode power distribution network |
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