CN101714777B - Control system for automatically switching wide areas of wide area backup power supply of electric power system - Google Patents
Control system for automatically switching wide areas of wide area backup power supply of electric power system Download PDFInfo
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- CN101714777B CN101714777B CN2009101931067A CN200910193106A CN101714777B CN 101714777 B CN101714777 B CN 101714777B CN 2009101931067 A CN2009101931067 A CN 2009101931067A CN 200910193106 A CN200910193106 A CN 200910193106A CN 101714777 B CN101714777 B CN 101714777B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
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Abstract
The invention relates to a control system for automatically switching wide areas of a wide area backup power supply of an electric power system. A main station end comprises a data acquisition unit, a data processing unit and a data sending unit, wherein the data acquisition unit acquires wide area state information and information on each switch of the electric power system; the data processing unit provides a load feeder inter-tripping list of a transformer station; the data sending unit transmits load feeder inter-tripping list to a plant station end; the plant station end is provided with a main control unit which comprises a receiving unit, a detecting unit and a processing execution unit; the receiving unit receives and stores the current load feeder inter-tripping list of the station; the detecting unit detects whether a conventional action condition is satisfied on line; and the processing execution unit switches on a line switch on a backup power supply side first, then cuts off a load feeder required to be cut off, and finally sends 'ready action' information to a main station. The remote control and the remote communication between the main station end and each plant station end are realized through a special communication network of the electric power system. The control system can achieve the effect of realizing 'wide area control' according to 'state information of all electric power systems', and has reliable action processes.
Description
Technical field
The present invention relates to a kind of automatic control technology of power system, be specifically related to a kind of control system for automatically switching wide areas of wide area backup power supply of electric power system.
Background technology
Along with electrical network constantly enlarges, it is difficult all the more that the blocking of area power grid short circuit current becomes, and in order to reduce electromagnetic looped network to the impact of electric network security, consisted of in the situation of looped network at high one-level electrical network, the low one-level electrical network of area power grid will unlink and be the power supply of radial pattern subregion burst.But the reliability of the electrical network after unlinking obviously descends, and for this reason " automatic change-over device of emergency " (industrial also usually referred to as stand-by power supply automatic switching or BZT) is widely applied as a kind of " microcomputer control equipment " in area power grid transformer station.Automatic change-over device of emergency is after a certain working power fault and other reason are disconnected, and can automatically stand-by power supply or other normal operation power supply be devoted oneself to work a kind of automatics that the user that working power is disconnected is unlikely to have a power failure rapidly.
In order to describe the operation principle of traditional standby power supply automatic switching device in detail, Fig. 1 has provided a typical 110kV circuit stand-by power supply automatic switching schematic diagram.
The switching control mode of stand-by power supply automatic switching is as described below.
I circuit stand-by power supply automatic switching (mode 1)
At ordinary times, the operation of #1 inlet wire, the #2 inlet wire is for subsequent use, and namely 1DL, 3DL are in co-bit, and 2DL is in a minute position.
When the #1 incoming power hinders or after other reason was disconnected, #2 inlet wire stand-by power supply should be able to drop into automatically, and only allows action once for some reason.In order to meet this requirement, designed the stand-by power supply automatic switching control device that is similar to the circuit automatic reclosing, just control device only allows to haul oneself willingly into after charging is finished.
The control device charge condition:
A) I mother, the female equal three-phase of II have pressure, and when the #2 line voltage distribution checked that control word drops into, the #2 circuit had pressure (Ux2),
B) 1DL, 3DL are in co-bit, and 2DL is in a minute position.
Must satisfy simultaneously above-mentioned two conditions, after 15 seconds, charge and finish.
It also is discharging condition that control device is hauled oneself willingly into:
A) when the #2 line voltage distribution checks that control word drops into, #2 circuit with no pressure (Ux2),
B) 2DL closes,
C) hand is jumped 1DL or 3DL,
D) other outside block signal,
E) control word of adjusting does not allow the #2 service entrance switch to haul oneself willingly into.
Satisfy that any one gets final product in above-mentioned 5 conditions.
Course of action: after charging is finished, I mother, the female equal with no pressure of II, Ux2 has pressure, and standby the throwing opened, and I1 is without stream, and time-delay Tb1 tripping 1DL after the affirmation 1DL tripping, closes 2DL.
II circuit stand-by power supply automatic switching (mode 2)
III bridge switch stand-by power supply automatic switching (mode 3, mode 4)
When two sections bus fanout operations, the Array selection bridge switch is hauled oneself willingly into scheme.
Charge condition: a) I mother, the female equal three-phase of II have pressure;
B) 1DL, 2DL are in co-bit, and 3DL is in a minute position.
Must satisfy simultaneously above-mentioned two conditions, after 15 seconds, charge and finish.
Discharging condition: a) 3DL is in co-bit;
B) female, the female equal three-phase with no pressure of II of I;
C) hand is jumped 1DL or 2DL;
D) other outside block signal is such as power transformer interior fault etc.
Satisfy that any one gets final product in above-mentioned 4 conditions.
Course of action: after charging is finished
A) the female with no pressure of mode 3:I, #1 inlet wire are without stream, and mother II has pressure, and mode 3 is hauled oneself willingly into the control word of adjusting and allowed, and then after the Tb3 time-delay, jump 1DL, confirm to close 3DL after the 1DL tripping.
B) the female with no pressure of mode 4:II, #2 inlet wire are without stream, and mother I has pressure, and mode 4 is hauled oneself willingly into the control word of adjusting and allowed, and then after the Tb4 time-delay, jump 2DL, confirm to close 3DL after the 2DL tripping.
What provide on the Vehicles Collected from Market all designs according to following 1 to 6 " control logic of local state information " with all automatic change-over device of emergencies that moving, and does not have the ability of the whole running statuses of whole electric power system being adjusted in real time response.
Existing stand-by power supply automatic switching control basic principle is:
1, only have after working power is disconnected really, stand-by power supply just can be put into, and fault can not be excised by the stand-by power supply automatic switching.
When 2, causing adjacent backup protection action excision working power because of its protection tripping of stand-by power supply automatic switching object fault for subsequent use, answer locking stand-by power supply automatic switching.
3, the time-delay of stand-by power supply automatic switching is the busbar voltage decline that causes in order to escape working power lead-out wire fault, so the time-delay time limit of stand-by power supply automatic switching should be greater than the longest Removal of external faults time.
4, by artificial excision working power, the stand-by power supply automatic switching should not move, and increases in case of necessity hand and jumps locking.
5, stand-by power supply does not satisfy press strip spare, and the stand-by power supply automatic switching should not move.
6, the stand-by power supply automatic switching only should move once, therefore wants the switching one-off locking of equipment electricity consumption source automatic or increases charge condition, generally is that the standby throwing of at once discharge order can't be moved again after the action.
Do not have based on the existing automatic change-over device of emergency of " local information " (industrial yet often be called: on the spot information) all state informations of whole electric power system are carried out the analyzing and processing ability, in order to further specify this problem, please control the problem of bringing referring to typical electric power system shown in Figure 2 and conventional stand-by power supply automatic switching thereof:
(1) existing stand-by power supply automatic switching strategy is not considered the fail safe of distant place stand-by power supply side apparatus, may cause power grid accident to spread.
Stand-by power supply automatic switching control strategy has only been considered local substation bus bar voltage or inlet wire current on the spot at present, and do not consider the capacity-load ratio of distant place stand-by power supply side main transformer, the thermally-stabilised limit of circuit etc., easily cause stand-by power supply side overload tripping operation, cause the further expansion of fault.
In Fig. 2, when circuit 1 fault withdraws from, the DL1 tripping, transformer station's 1 dead electricity, circuit stand-by power supply automatic switching action and DL2 on the automatic pressing drops into extension wire 2, at this moment, transformer station's 1 load will all be transferred on the statements based on collusion circuit and 220kV main transformer T1 in circuit 2 and a distant place basically; If this moment, the capacity-load ratio of T1 was very low, or the branch power of statements based on collusion circuit is near the thermally-stabilised limit, and then the load of this part transfer will cause the action of relevant overload or overcurrent protection, finally cause system failure expansion.Therefore, the state information with distant place stand-by power supply side transformer and statements based on collusion circuit is incorporated in the local stand-by power supply automatic switching strategy and seems extremely important.
(2) existing stand-by power supply automatic switching strategy is subject to the local small power source interference, causes the mistake action and rejecting action accident.
The fault detection of power loss signal of stand-by power supply automatic switching generally is voltage and current at present, and the single meeting of detection signal causes the generation of the mistake action and rejecting action phenomenon of stand-by power supply automatic switching.For the voltage setting value Ding Detai low (such as voltage be decided to be 30%) of some transformer station with dead electricity, when occuring such as (1) described fault, after the DL2 tripping, 110kV2M since the supporting role of local unit can't fall too much, thereby cause the generation of stand-by power supply automatic switching misaction; On the other hand, if voltage setting value Ding Detaigao (being decided to be 70% such as voltage), then exert oneself littlely in that local power supply is idle, malfunction occurs when local load or burden without work is heavier.
(3) existing stand-by power supply automatic switching strategy can't be realized and the safety control coordination, causes a large amount of stand-by power supply automatic switchings to have to stop using.
What the safety control of existing major network was relevant with local power network mainly is low frequency load shedding equipment.If the fixed automatic excision circuit of UFLS has circuit 2, then when circuit 2 be because during UFLS excision that the major network fault causes, existing stand-by power supply automatic switching can't be offered an explanation circuit 1 fault or the action of security control device, therefore can automatically throw into circuit 1 side; This will cause original major network security control measure to fall through, and directly threaten the major network safe operation.Also just because of this contradictory relation, if top 220kV transformer station is stable system actuating station at present, 110kV transformer station will have to withdraw from the stand-by power supply automatic switching, cause a kind of waste of stand-by power supply automatic switching resource.In fact; if can in existing stand-by power supply automatic switching strategy, introduce peace control signal and the guard signal of distant place 220kV transformer station; can offer an explanation line fault or stable system acting with simple logic; can recover like this work of existing stand-by power supply automatic switching; directly improve utilance and transformer station's power supply reliability of stand-by power supply automatic switching, finally realize the coordination of stand-by power supply automatic switching and security control device.Present actual conditions are, the automatic change-over device of emergency that China's area power grid has come into operation does not all possess distant place locking and wide area control function, according to the requirement of afore mentioned rules, necessary out of service with the 110kV automatic change-over device of emergency of stable System Dependent.
Summary of the invention
Technical problem to be solved of the present invention, a kind of control system for automatically switching wide areas of wide area backup power supply of electric power system just is provided, consider the fail safe of a distant place stand-by power supply side apparatus during its control stand-by power supply automatic switching, can avoid power grid accident to spread, and be not subject to local small power source and disturb, can not cause the mistake action and rejecting action accident, last, can also realize and the safety control coordination, directly improve utilance and transformer station's power supply reliability of stand-by power supply automatic switching.
Realize above-mentioned purpose, the technical scheme that the present invention takes is:
A kind of control system for automatically switching wide areas of wide area backup power supply of electric power system, it is characterized in that comprising: the automatic change-over device of emergency of wide area stand-by power supply automatic switching computerized information and control platform (main website end) and a plurality of bottoms (factory's station end) consists of, the main website end is stood with each factory and is communicated by letter with a distant place by electric power system special communication network realization distant place control between the end, consists of the electric power system layered distribution type wide-area control system of a high and low layer structure.
Described main website end is circumscribed with human-computer interaction interface, and described factory's station end (each transformer station) is provided with main control unit.
Described main website end contains data acquisition unit, data processing unit and data transmission unit, data acquisition unit gathers electrical power system wide-area state information and switching information (all information that comprised the electrical network actual motion, the for example state of electrical network and switch data, electric current, the size of voltage, the state of switch etc., each substation connects load, the circuit through-put power, voltage, current parameters, switching information etc.) and pass to data processing unit, the electrical power system wide-area state information of the importance degree of transformer station's load and continuous real-time update in the data processing unit database, switching information adopts wide area stand-by power supply automatic switching control decision method to provide current all transformer station's load feeder connection that the stand-by power supply automatic switching is installed and cuts tabulation and pass to data transmission unit; The load feeder connection that the automatic change-over device of emergency that data transmission unit is regularly held to the factory station issues is at that time cut tabulation.
Described factory station end is provided with main control unit, it comprises receiving element, detecting unit, the processing execution unit, receiving element receives and storage is cut tabulation by the current load feeder connection in this station that the main website end sends, detecting unit detects online the stand-by power supply automatic switching and whether satisfies conventional operation condition, the processing execution unit satisfies under the conventional operation condition receiving this automatic change-over device of emergency that detecting unit sends, the line switching of stand-by power supply side closes first, then and send the information of " moving " to the main website end then cut away load feeder connection according to the current distant place control command of stand-by power supply automatic switching and cut the load feeder that requires excision in the tabulation.
Beneficial effect: on December 9th, 2008 is in Zhaoqing power supply administration of CHINA SOUTHERN POWER Guangdong Power Grid company, South China Science ﹠ Engineering University, Holley's science and technology, Tsing-Hua University, under the personnel's of relevant departments that the Nanjing electricity grinds the positive cooperation, " control system for automatically switching wide areas of wide area backup power supply of electric power system " that proposes in the present patent application book carried out a series of on-the-spot test test, obtained good Expected Results.
Concrete test experiments is summarized as follows: test process is divided into three phases, and first: do not have the operation of power networks risk situation after being set as the automatic change-over device of emergency action, namely without the out-of-limit ruuning situation of equipment; Second: only need join the situation of cutting 10 kilovolt after being set as the automatic change-over device of emergency action; The the 3rd: be set as the situation that needs connection to cut two 10 kilovolt switches after the backup auto-activating device action.Test event is as follows:
The main website end:
(1) control system result of calculation correctness;
(2) cut 10 kilovolt switches (in the phase I not this step) for connection in the control strategy table;
(3) distant place is thrown and is moved back automatic change-over device of emergency function (phase I is " distant place ", and second stage is " on the spot ");
(4) dispatching terminal interface display correctness;
Actuating station:
(1) correctly receives control command;
(2) on-the-spot backup auto-activating device sequence of movement is for moving first in 110 kilovolt switches, and connection is cut two 10 kilovolt switches again;
(3) actuating signal correctness;
(4) carry out distant place throwing and move back the order correctness.
All test results have all reached desirable Expected Results, test result shows that " control system for automatically switching wide areas of wide area backup power supply of electric power system " that propose in the present patent application book can reach according to " all POWER SYSTEM STATE information " thereby the effect of realization " wide area control ", and course of action is reliable.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the circuit stand-by power supply automatic switching associated diagram that the 110kV transformer station of prior art uses;
Fig. 2 is the 110kV transformer station automatic change-over device of emergency wiring schematic diagram that contains local small power source;
Fig. 3 is the hardware basic framework figure of wide area stand-by power supply automatic switching control system;
Fig. 4 is the control flow chart of wide area stand-by power supply automatic switching control system;
Fig. 5 is the software architecture diagram of wide area stand-by power supply automatic switching control system main website end;
Fig. 6 is the logical schematic of wide area automatic change-over device of emergency.
Embodiment
As depicted in figs. 1 and 2, the automatic change-over device of emergency principle of prior art is applied in the circuit that 110kV transformer station uses, and these two inlet wires of 1# and 2# pass through 1DL among the figure, 2DL, and 3DL carries out the switching of electric power incoming line.
Fig. 2 is the 110kV transformer station automatic change-over device of emergency wiring schematic diagram (typical statements based on collusion mode) that contains local small power source, this figure be the normal electricity system from voltage levels the electrical network schematic diagram to low-voltage-grade, comprising main power source side and stand-by power supply side, each transformer station is with certain power load, local small power source is surfed the Net by main transformer, wherein P
GAnd Q
GMeritorious and idle exerting oneself for local small power source.
Figure 3 shows that the composition basic framework figure of wide area stand-by power supply automatic switching control system of the present invention, as can be seen from FIG., wide area stand-by power supply automatic switching control system of the present invention comprises:
The automatic change-over device of emergency of wide area stand-by power supply automatic switching computerized information and control platform (main website end) 1 and a plurality of bottoms (factory's station end) 2 consists of, consist of the electric power system layered distribution type wide-area control system of a high and low layer structure, main website end 1 is circumscribed with human-computer interaction interface 4, realizes by electric power system special communication network 3 (the wide area prepared auto restart communication protocol of transforming in the IEC60870-5-101 stipulations) that a distant place is controlled between main website end 1 and each factory station end 2 and communicates by letter with a distant place.
Control flow chart referring to the wide area stand-by power supply automatic switching control system of Fig. 4, main website end 1 contains data acquisition unit 11, data processing unit 12 and data transmission unit 13, data acquisition unit 11 gathers electrical power system wide-area state information and switching information (all information that comprised the electrical network actual motion, the for example state of electrical network and switch data, electric current, the size of voltage, the state of switch etc., each substation connects load, the circuit through-put power, voltage, current parameters, switching information etc.), data processing unit 12 is according to the importance degree of transformer station's load in the database, and electrical power system wide-area state information and switching information, provide current all transformer station specific electric load feeder line connection that the stand-by power supply automatic switching is installed and cut tabulation; The automatic change-over device of emergency that data transmission unit 13 is regularly held to the factory station issues the load feeder connection and cuts tabulation.
Factory's station end 2 is provided with main control unit, it comprises receiving element 21, detecting unit 22, processing execution unit 23, receiving element 21 regularly receives and storage is cut tabulation by the current load feeder connection in this station that main website end 1 sends, whether the detecting unit 22 online stand-by power supply automatic switchings that detect satisfy conventional operation condition, if do not satisfy operation condition, then return the distant place control command that continues to receive and store the main website end; If satisfy operation condition, then processing execution unit 23 is according to the current distant place control command of stand-by power supply automatic switching, then the line switching of stand-by power supply side that closes first cuts away the load feeder connection and cuts the load feeder that requires excision in the tabulation, last and send the information of " moving " to main website.
In this explanation a bit, because electrical power system wide-area state information and switching information are dynamic changes, so above-mentioned control flow also is dynamic.
Fig. 5 is the software architecture diagram of wide area stand-by power supply automatic switching control system main website end, because automatic change-over device of emergency is under the jurisdiction of numerous electric power system dispatching of power netwoks control system, " wide area stand-by power supply automatic switching control system " software systems of therefore developing generally can be embedded in the dispatching of power netwoks computer control system software.
Part among Fig. 5 in the empty frame 501 is exactly " wide area stand-by power supply automatic switching control decision method " proposed by the invention, it generates " Power system state estimation program " according to state and the switch data of electrical network, form tidal current analysis feature modeling condition and autoexec, carry out the application that trend is calculated, system at first checks whether satisfy static security verification safety, if verification is defective then according to " 10% diminishing method " search method, reduce the load value (transferable load value) of automatic change-over device of emergency place substation bus bar, until safety check is qualified, preserving qualified transferable load value is the control permission definite value of this prepared auto restart, finish the stand-by power supply automatic switching and control in real time definite value and slip condition database, each automatic change-over device of emergency of the most backward distant place issues corresponding load feeder connection and cuts tabulation.
And " Power system state estimation program " is the advanced applied software of the standard configuration in the modern power systems dispatching of power netwoks control system.
Fig. 6 is the logical schematic of wide area automatic change-over device of emergency, comprises two parts among the figure, and the conventional logic of the conventional automatic change-over device of emergency of the first has independent starting section, and charge protection carries out switching mode; Another part is that the present invention newly adds part, cut tabulation by a distant place load feeder connection of accepting to be sent by the main website end, whether the online automatic change-over device of emergency that detects satisfies conventional operation condition, if do not satisfy operation condition, then return the distant place control command that continues to receive and store the main website end, if satisfy operation condition, then first according to the current distant place control command of automatic change-over device of emergency, the line switching of stand-by power supply side closes first, then and send the information of " moving " to main website then cut away in the tabulation load feeder that requires excision.After the automatic change-over device of emergency action, cut strategy from main website termination receipts " wide area stand-by power supply automatic switching our station load feeder connection is cut the tabulation definite value " as connection according to device is the last, cut course of action with " throw afterwards first and cut " Pattern completion load connection, install during this time sent out the time-delay order by the cutting load circuit, be generally 200ms.And move back function by throwing at the remote control of master station of soft pressing plate implement device; Realize that by hard pressing plate " distant place, on the spot " switch.
Factory's end automatic change-over device of emergency should possess two kinds of functions: (1) basic function, the i.e. repertoire of " the on the spot control " of former traditional standby power supply automatic switching device; (2) receive " distant place control " function that main website end wide area is controlled.
Foreign current and voltage are inputted behind the isolation transformer isolated variable, input to A-D converter through low pass filter, after the CPU sampling numeral are processed, and consist of various protection relays, and calculate various remote measurement amounts.
UA1, UB1, UC1 are the female voltage of I, angle knot input; UA2, UB2, UC2 are the female voltage of II, angle knot input.
UJx1, UJx2 are the voltage between phases input of two inlet wire circuit PT.
IJX1, IJX2 are two inlet wires, one phase currents, are used for preventing the starting of PT broken string timer mistake.
IAC, IBC, ICC are special measurement CT input.
Device is introduced two sections busbar voltages (Uab1, Ubc1, Uca1, Uab2, Ubc2, Uca2), for having pressure, with no pressure to differentiate.Introduce two sections primary voltages (Ux1, Ux2) as hauling oneself willingly into the assistant criteria of preparing and moving, can select whether use through control word.Each service entrance switch is respectively introduced a phase current (I1, I2), is to cause the bridge switch miscarrying in order to prevent behind the PT three-phase broken string, and also be in order better to confirm tripping of service entrance switch.
Device is introduced 1DL, 2DL, 3DL position of the switch contact (TWJ), differentiates as system operation mode, hauls oneself willingly into and prepares and select to haul oneself willingly into mode.That has introduced 1DL, 2DL, 3DL switch closes rear position signalling (attracting from the switching manipulation loop), as the locking of hauling oneself willingly under the various ruuning situations.Also introduced respectively in addition closedown mode 1 and hauled oneself willingly into, closedown mode 2 is hauled oneself willingly into, and closedown mode 3,4 is hauled oneself willingly into three inputs.
The device output contact has 1DL, the 2DL of jumping, and 3DL closes 1DL, 2DL, each one pair of contact of 3DL, and one group of remote control is jumped and closed output.Signal output is respectively: device locking (can monitor the direct current dead electricity, normally closed contact), device is reported to the police, each one pair of contact of protection action.
Device also has 32 road load connection to cut output contact, for cutting load after the action of stand-by power supply automatic switching.
1) circuit stand-by power supply automatic switching (mode 1)
The operation of #1 inlet wire, the #2 inlet wire is for subsequent use, and namely 1DL, 3DL are in co-bit, and 2DL is in a minute position.When the #1 incoming power hinders or after other reason was disconnected, #2 inlet wire stand-by power supply should be able to drop into automatically, and only allows action once for some reason.In order to meet this requirement, designed the charging process that is similar to the circuit automatic reclosing, just only after charging is finished, allow to haul oneself willingly into.
Charge condition: a) I mother, the female equal three-phase of II have pressure, and when the #2 line voltage distribution checked that control word drops into, the #2 circuit had pressure (Ux2)
B) 1DL, 3DL are in co-bit, and 2DL is in a minute position
After 15 seconds, charge and finish.
Discharging condition: a) when the #2 line voltage distribution checks that control word drops into, #2 circuit with no pressure (Ux2)
B) 2DL closes
C) hand is jumped 1DL or 3DL
D) other outside block signal
E) control word of adjusting does not allow the #2 service entrance switch to haul oneself willingly into
Course of action: after charging was finished, I was female, the female equal with no pressure of II, and Ux2 has pressure, and I1 is without stream, and time-delay Tb1 tripping 1DL after the affirmation 1DL tripping, closes 2DL.
2) circuit stand-by power supply automatic switching (mode 2)
Charge condition: a) I mother, the female equal three-phase of II have pressure, and when the #1 line voltage distribution checked that control word drops into, the #1 circuit had pressure (Ux1);
B) 2DL, 3DL are in co-bit, and 1DL is in a minute position.
After 15 seconds, charge and finish.
Discharging condition: a) when the #1 line voltage distribution checks that control word drops into, #1 circuit with no pressure (Ux1);
B) 1DL closes;
C) hand is jumped 2DL or 3DL;
D) other outside block signal;
E) control word of adjusting does not allow the #1 service entrance switch to haul oneself willingly into.
Course of action: after charging was finished, I was female, the female equal with no pressure of II, and Ux1 has pressure, and I2 is without stream, and time-delay Tb2 tripping 2DL after the affirmation 2DL tripping, closes 1DL.
3) bridge switch stand-by power supply automatic switching (mode 3, mode 4)
When two sections bus fanout operations, the Array selection bridge switch is hauled oneself willingly into scheme.
Charge condition: a) I mother, the female equal three-phase of II have pressure;
B) 1DL, 2DL are in co-bit, and 3DL is in a minute position.
After 15 seconds, charge and finish.
Discharging condition: a) 3DL is in co-bit;
B) female, the female equal three-phase with no pressure of II of I;
C) hand is jumped 1DL or 2DL;
D) other outside block signal is such as power transformer interior fault etc.
Course of action: after charging is finished
A) the female with no pressure of mode 3:I, #1 inlet wire are without stream, and mother II has pressure, and mode 3 is hauled oneself willingly into the control word of adjusting and allowed, and then after the Tb3 time-delay, jump 1DL, confirm to close 3DL after the 1DL tripping.
B) the female with no pressure of mode 4:II, #2 inlet wire are without stream, and mother I has pressure, and mode 4 is hauled oneself willingly into the control word of adjusting and allowed, and then after the Tb4 time-delay, jump 2DL, confirm to close 3DL after the 2DL tripping.
4) mother charge protection
One section three-phase overcurrent protection is set device specially and one section zero sequence overcurrent protection is used for the busbar charging protection, at bus connection switch
The 500ms that closes is interior to be dropped into automatically, and the mother charge protection can be thrown with pressing plate and move back.
5) the load connection is cut protection (function that increases newly in the present patent application)
After the action of device stand-by power supply automatic switching, cut strategy from main website termination receipts " wide area stand-by power supply automatic switching our station load connection is cut the tabulation definite value " as connection according to device is the last, cut course of action with " throw afterwards first and cut " Pattern completion load connection, idiographic flow is as follows: wide area stand-by power supply automatic switching computerized information and control platform comprise: the data acquisition of (1) " to electrical power system wide-area state information and switching information "; (2) carry out the on line real time control decision-making; (3) and according to the importance degree of transformer station load in the database, provide current all transformer station's load feeder connection that the stand-by power supply automatic switching is installed and cut tabulation; (4) the last regularly automatic change-over device of emergency that hold at each factory station to a distant place issues the load feeder connection and cuts tabulation.The automatic change-over device of emergency of bottom comprises that (1) regularly receives and storage is cut tabulation by the distant place load feeder connection that the main website end sends; (2) detect online prepared auto restart and whether satisfy conventional operation condition; (3) if do not satisfy operation condition, then return the distant place control command that continues to receive and store the main website end; Then and send the information of " moving " to main website (4) if satisfy operation condition, then first according to the current distant place control command of prepared auto restart, then the line switching of stand-by power supply side that closes first cuts away the load feeder that requires excision in the tabulation.Install during this time being sent out the 200ms trip signal by the cutting load circuit.The load connection of device is cut the visible Fig. 6 of protection action logic figure.
6) PT broken string
The female PT broken string of I is differentiated:
When a) positive sequence voltage is less than 30V, I1 greater than 0.06In or 1DL jump position, 3DL at co-bit I2 greater than 0.06In;
B) negative sequence voltage is greater than 8V.
Satisfy above arbitrary condition time-delay and reported the female PT broken string of I in 2.5 seconds, time-delay was returned in 10 seconds after broken string disappeared.The female PT broken string criterion of H and mother I are roughly the same.
The circuit PT differentiation of breaking: the control word of adjusting requires to check line voltage distribution, if line voltage distribution Ux1 (Ux2) less than 0.3Un (Un=100V) and I1 (I2) greater than 0.06In, reported #1 (#2) circuit PT broken string through 2.5 seconds, time-delay was returned in 10 seconds after broken string disappeared.
7) device alarm
When CPU detects own hardware fault, a whole set of protection of simultaneously locking of issue device alarm signal.Hardware fault comprises: FLASHROM, RAM, definite value is made mistakes.
When CPU detects following fault, send operation exception and report to the police:
A) switch has electric current (I1, I2, IA or IB or IC) and corresponding TWJ (1DL, 2DL, 3DL) is " 1 ", and is unusual through 10 seconds corresponding TWJ of time-delay newspaper, and the locking automatic closing;
B) I is female, the female PT of II breaks, circuit PT broken string.
8) remote signaling function
The remote signalling amount mainly contains: 4 tunnel remote signalling are opened into, displacement remote signalling and accident remote signalling, and make sequence of events recording, and remote signalling resolution is less than 2ms.
9) time adjustment function
When device possesses the network software school and the hardware pulse time adjustment function.
10) an automatic change-over device of emergency distant place is thrown and is moved back function (function that increases newly in the present patent application)
Device is set up the remote control throwing at master station of " a stand-by power supply automatic switching distant place is thrown and moved back " soft pressing plate implement device and is moved back function.
11) stand-by power supply automatic switching " distant place, on the spot " switches (function that increases newly in the present patent application)
Device is set up " a stand-by power supply automatic switching distant place, on the spot " and is switched hard pressing plate, and pressing plate drops into the expression automatic change-over device of emergency and adopts distant place function, withdraws from indication device and adopts on the spot function.When adopting on the spot function, device is not accepted " master station wide area load connection is cut the tabulation definite value " and the unloading device order is thrown in a distant place.
Claims (1)
1. control system for automatically switching wide areas of wide area backup power supply of electric power system, it is characterized in that: comprise wide area stand-by power supply automatic switching computerized information and control platform (1), and the automatic change-over device of emergency of a plurality of bottoms (2), realize by electric power system special communication network (3) that a distant place is controlled between wide area stand-by power supply automatic switching computerized information and control platform (1) and each automatic change-over device of emergency (2) and communicate by letter with a distant place, consist of the electric power system layered distribution type wide-area control system of a high and low layer of structure; Described wide area stand-by power supply automatic switching computerized information and control platform (1) contain data acquisition unit (11), data processing unit (12) and data transmission unit (13), data acquisition unit (11) gathers electrical power system wide-area state information and switching information, data processing unit
(12) according to the importance degree of transformer station load in electrical power system wide-area state and switching information and the database, adopt wide area stand-by power supply automatic switching control decision method to provide current all transformer station's load feeder connection that automatic change-over device of emergency (2) is installed and cut tabulation; Data transmission unit (13) regularly issues the load feeder connection to each automatic change-over device of emergency (2) and cuts tabulation; Described automatic change-over device of emergency (2) is provided with main control unit, it comprises receiving element (21), detecting unit (22), processing execution unit (23), receiving element (21) receives by electric power system special communication network (3) and storage is cut tabulation, detecting unit by the current load feeder connection of this automatic change-over device of emergency (2) that wide area stand-by power supply automatic switching computerized information and control platform (1) send
(22) detect online this automatic change-over device of emergency (2) and whether satisfy conventional operation condition, processing execution unit (23) is receiving this automatic change-over device of emergency (2) that detecting unit (22) sends and is satisfying the line switching of this automatic change-over device of emergency (2) mains side of closing first in the situation of conventional operation condition, again according to the current distant place control command of this automatic change-over device of emergency (2), then cut away the load feeder connection and cut the load feeder that requires excision in the tabulation, and send the information of having moved to wide area stand-by power supply automatic switching computerized information and control platform (1).
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938117B (en) * | 2010-10-14 | 2012-10-31 | 山东大学 | Current differential protection method for smart distribution network |
| CN102185371B (en) * | 2011-04-21 | 2013-09-18 | 北京航空航天大学 | Terminal user bus-tie spare power source automatic switching control device with overcurrent self-protection |
| CN102545377B (en) * | 2012-02-13 | 2013-04-10 | 国家电网公司 | Adaptive spare power automatic switching intertripping device based on substation measurement and control digital quantity |
| CN102623969B (en) * | 2012-03-22 | 2014-09-03 | 上海市电力公司 | Microcomputer protecting and controlling type remote control retreating reclosure system |
| CN103326460A (en) * | 2012-03-23 | 2013-09-25 | 鹤岗电业局 | Remote stability control method and device |
| CN103595030B (en) * | 2013-11-28 | 2016-01-20 | 山东迅风电子有限公司 | Based on the distribution network automation feeder terminal protecting control method of electric current criterion |
| CN103618376B (en) * | 2013-12-04 | 2016-08-31 | 国家电网公司 | A kind of improved method of main transformer protection locking prepared auto restart |
| CN106655462B (en) * | 2015-10-29 | 2023-03-28 | 贵州电网公司兴义供电局 | Double-master-station regional spare power automatic switching method |
| CN106160229A (en) * | 2016-08-02 | 2016-11-23 | 江苏方天电力技术有限公司 | A kind of customer charge real-time control method and system |
| CN107222020A (en) * | 2017-06-20 | 2017-09-29 | 国家电网公司 | A kind of stability control equipment and backup auto-activating device interlocking control method, apparatus and system |
| CN107658983B (en) * | 2017-10-10 | 2021-04-02 | 广东电网有限责任公司电力调度控制中心 | Main backup protection fixed value decoupling and setting method |
| CN110932395B (en) * | 2019-11-25 | 2023-09-15 | 广东电网有限责任公司 | Communication system of low-voltage intelligent spare power automatic switching |
| CN113495532A (en) * | 2020-04-01 | 2021-10-12 | 南京南瑞继保工程技术有限公司 | Inter-station communication control method for stable control |
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