CN103279617B - The method and system being connected with bus with the many back transmission lines of tower - Google Patents
The method and system being connected with bus with the many back transmission lines of tower Download PDFInfo
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- CN103279617B CN103279617B CN201310220240.8A CN201310220240A CN103279617B CN 103279617 B CN103279617 B CN 103279617B CN 201310220240 A CN201310220240 A CN 201310220240A CN 103279617 B CN103279617 B CN 103279617B
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Abstract
The method that the many back transmission lines of same tower are connected with bus, comprises step: obtain the simulation model of the many back transmission lines of same tower that prestore, wherein, every link tester in simulation model is crossed 3 breakers and is connected with A phase, B phase, the C of bus respectively; The phase sequence arrangement mode that prestores to the many back transmission lines of same tower travels through, and obtains one group of phase sequence arrangement mode; According to the each breaker of phase sequence arrangement mode control, every circuit is accessed respectively to phase corresponding to each bus in simulation model, the three-phase current unbalance index of calculating and storing this simulation model under stable state; After the phase sequence arrangement mode that prestores has traveled through, determine phase sequence arrangement mode corresponding to minimum three-phase current unbalance index in each three-phase current unbalance index; Set up with the connection between every circuit of the many back transmission lines of tower and phase corresponding to each bus according to definite phase sequence arrangement mode. This programme also provides corresponding system. Improved the efficiency of the operating process that circuit is connected with bus by the present invention.
Description
Technical field
The present invention relates to the technical field that transmission line of electricity is connected with bus, particularly relate to same tower and feed back electric wire moreThe method and system that road is connected with bus.
Background technology
The many back transmission lines of same tower of actual motion, because transposition is complicated, are generally all taked not transposition form. WhenWhen circuit does not replace, due to the electromagnetic coupled impact between each circuit, with the many back transmission lines of tower when the operationThere is three-phase current unbalance problem (comprising negative-sequence current and zero-sequence current), serious threat ultra-high-tension power transmission lineSafe operation and the correct operation of protective relaying device.
Three-phase current unbalance several factors with the many back transmission lines of tower is relevant, as wire parameter, wirePhase sequence arrangement mode, shaft tower parameter, systematic parameter, ground return circuit parameter etc. When the many back transmission lines of same towerAfter construction completes, wire parameter, shaft tower parameter, systematic parameter, ground return circuit parameter etc. all determine,The principal element that affects circuit three-phase current unbalance is the connected mode of wire and bus. By preferred phaseOrder arrangement mode is set up with the connection between each circuit of the many back transmission lines of tower and the corresponding phase of each bus, canReduce three-phase current unbalance degree. Owing to adopting the original order parameter with the many back transmission lines of tower to calculate three-phase electricityFlow uneven more complicated. The main method that adopts electromagnetic transient simulation at present, according to real system and sameTower multi circuit transmission lines, at EMTP(Electro-MagneticTransientProgram electromagnetic transient state procedure),MATLAB(MatrixLaboratory matrix experiment chamber), PSCAD/EMTDC(PowerSystemComputerAidedDesign/ElectroMagneticTransientinDCSystem power system computerComputer Aided Design/direct current transient state) etc. build corresponding simulation model in electromagnetic transient simulation software.
In the method for attachment of tradition phase sequence, often complete a kind of simulation calculation of phase sequence arrangement mode, all will manually rememberRecord simulation result needs by the phase sequence arrangement mode in manual change's program simultaneously, just can carry out nextInferior simulation calculation, then also needs by artificially the simulation result of record being sorted and option screening,Rear foundation is with the connection between each circuit and the corresponding phase of each bus of the many back transmission lines of tower.
Known, in conventional art, the operating process inefficiency that circuit is connected with bus.
Summary of the invention
Based on this, be necessary inefficient the asking of operating process being connected with bus for the many back transmission lines of same towerTopic, provides a kind of same tower method and system that many back transmission lines are connected with bus.
The method that the many back transmission lines of same tower are connected with bus, comprises step:
Obtain the simulation model of the many back transmission lines of same tower that prestore, wherein, in described simulation model everyLink tester is crossed 3 breakers and is connected with A phase, B phase, the C of described bus respectively;
The phase sequence arrangement mode that prestores to the many back transmission lines of same tower travels through, and obtains one group of phase sequence arrangement sideFormula;
According to the each described breaker of described phase sequence arrangement mode control, every circuit is accessed respectively to described emulationPhase corresponding to each bus in model, the three-phase current unbalance index of calculating and storing this simulation model under stable state;
After the described phase sequence arrangement mode that prestores has traveled through, determine in each described three-phase current unbalance indexThe phase sequence arrangement mode that little three-phase current unbalance index is corresponding;
Every circuit setting up the many back transmission lines of described same tower according to described definite phase sequence arrangement mode is with eachConnection between phase corresponding to bus.
A kind of with the many back transmission lines of tower and busbar connection system, comprising: simulation model module, control module,Link block,
Described emulation module, for obtaining the simulation model of the many back transmission lines of same tower that prestore, receives and controlsSignal, accesses respectively phase corresponding to each bus in described simulation model according to described control signal by every circuit,And return to the response data under stable state to described control module, and wherein, every circuit in described simulation modelBe connected with A phase, B phase, the C of described bus respectively by 3 breakers,
Described control module, travels through for the phase sequence arrangement mode that prestores to the many back transmission lines of same tower,Obtain one group of phase sequence arrangement mode; Described in sending to described simulation model module according to described phase sequence arrangement modeControl signal, receives the described response data that described simulation model module is returned, and calculates and store three-phase currentUneven index; After the described phase sequence arrangement mode that prestores has traveled through, determine each described three-phase current unbalancePhase sequence arrangement mode corresponding to minimum three-phase current unbalance index in index;
Link block, for setting up the many back transmission lines of described same tower according to described definite phase sequence arrangement modeEvery circuit and phase corresponding to each bus between connection.
The method and system that the many back transmission lines of above-mentioned same tower are connected with bus, by feeding back electric wire to same tower moreThe phase sequence arrangement mode that prestores on road travels through, and realization accesses respectively same tower by every circuit and feeds back electricity more automaticallyPhase corresponding to each bus in the simulation model that prestores of circuit, calculates and storage emulation result, and Automatic sieve is selectedPhase sequence arrangement mode corresponding to little three-phase current unbalance index is optimum phase sequence arrangement mode, improves screening effectRate. According to this optimum phase sequence arrangement mode link, thereby improve the operating process that circuit is connected with busEfficiency. By the present invention, have the following advantages:
1, change the many back transmission lines of same tower by changing with the mode of connection of the many back transmission lines of tower and busPhase sequence arrangement mode, and need in the data card of shaft tower circuit model, not re-enter parameter, improve workMake efficiency;
2, by breaker and breaker control logic realization transmission line with four-circuit on single tower phase sequence arrangement mode fromMoving adjustment, has avoided revising manually in prior art the line parameter circuit value of shaft tower or has manually adjusted sameThe mode of connection of the many back transmission lines of tower and bus is revised the phase sequence arrangement mode of the many back transmission lines of same tower;
3,, in PSCAD/EMTDC platform, utilize MultipleRun(multi-channel running) module is automatically completeThe in pairs traversal of transmission line with four-circuit on single tower phase sequence arrangement mode, avoids in prior art manual mode right one by oneEach phase sequence arrangement mode carries out simulation calculation;
4, MultipleRun module is carried out auto-sequencing to traversing result, avoids recording respectively by manual typeInferior simulation result sorts again.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the embodiment of the method that is connected with bus with the many back transmission lines of tower of the present invention;
Fig. 2 is with four times system equivalent wiring schematic diagrams of tower in the embodiment of the present invention;
Fig. 3 is wire and bus connection diagram in transmission line with four-circuit on single tower in the embodiment of the present invention.
Detailed description of the invention
The preferred embodiment of the method and system being connected with bus with the many back transmission lines of tower for the present invention belowBe described in detail.
First the embodiment of the method being connected with bus for the many back transmission lines of same tower is described.
Referring to Fig. 1, the flow process signal of the embodiment of the method being connected with bus with the many back transmission lines of tower for the present inventionFigure, comprises step:
Step S101: obtain the simulation model of the many back transmission lines of same tower that prestore, wherein, in simulation modelEvery link tester cross 3 breakers and be connected with A phase, B phase, the C of bus respectively;
Step S102: the phase sequence arrangement mode that prestores to the many back transmission lines of same tower travels through, obtains one groupPhase sequence arrangement mode;
Step S103: according to the each breaker of phase sequence arrangement mode control, every circuit is accessed respectively to emulation mouldPhase corresponding to each bus in type, the three-phase current unbalance index of calculating and storing this simulation model under stable state;
Step S104: judge whether to have traveled through, if not, enter step S102, if so, enter step S105;
Step S105: determine that in each three-phase current unbalance index, minimum three-phase current unbalance index is correspondingPhase sequence arrangement mode;
Step S106: according to definite phase sequence arrangement mode set up with every circuit of the many back transmission lines of tower withConnection between phase corresponding to each bus.
The method and system that the many back transmission lines of above-mentioned same tower are connected with bus, by feeding back electric wire to same tower moreThe phase sequence arrangement mode that prestores on road travels through, and realization accesses respectively same tower by every circuit and feeds back electricity more automaticallyPhase corresponding to each bus in the simulation model that prestores of circuit, calculates and storage emulation result, and Automatic sieve is selectedPhase sequence arrangement mode corresponding to little three-phase current unbalance index is optimum phase sequence arrangement mode, improves screening effectRate. According to this optimum phase sequence arrangement mode link, thereby improve the operating process that circuit is connected with busEfficiency. Certainly, solved in time the three-phase current unbalance that transmission line with four-circuit on single tower exists in the time of operationProblem.
In the present embodiment, before being traveled through, the phase sequence arrangement mode that prestores of the many back transmission lines of same tower needsSet up simulation model, in the many back transmission lines of same same tower, only need to set up one time emulation mouldType calculates with this simulation model, so this simulation model can be prestored later. Then pass throughThe form of obtaining obtains. While setting up simulation model, can, directly by the mode of update routine, refer to controllingEvery circuit of form control and corresponding being connected of each bus in simulation model of order, also can be by prestoringWith every link tester in the simulation model of the many back transmission lines of tower cross 3 breakers respectively with the A phase of bus,B phase, C are connected, and realize every circuit of control corresponding with each bus in simulation model by the form of breakerBe connected. The present embodiment crosses 3 with every the link tester prestoring in simulation model of the many back transmission lines of same towerIndividual breaker describes with the mode that A phase, B phase, the C of bus are connected respectively.
In a specific embodiment, before obtaining the simulation model step of the many back transmission lines of same tower that prestore,Also comprise step: set up simulation model based on PSCAD/EMTDC platform. In this embodiment, Wo MenkeWith model simulation model.
In a specific embodiment, the phase sequence arrangement mode that prestores of the many back transmission lines of same tower is traveled through,Determine one group of phase sequence arrangement mode step, comprise step:
From each back transmission line, take out respectively one group of sortord based on MultipleRun, obtain one group of controlAmount, wherein, each back transmission line all has six groups of sortords;
Determine one group of phase sequence arrangement mode according to controlled quentity controlled variable and the relation of the contrast relationship table that prestores.
In the present embodiment, simulation model is set up based on PSCAD/EMTDC platform, in simulation modelAdd a MultipleRun module, MultipleRun module can produce one group of controlled quentity controlled variable at every turn, realizesAutomatically ergodic process.
In a specific embodiment, according to the each breaker of phase sequence arrangement mode control, by every circuit respectivelyPhase step corresponding to each bus in access simulation model, comprises step: produce and control according to phase sequence arrangement modeSignal; According to phase corresponding to each bus in the each closing of power circuit breaker of control signal control or disconnection simulation model. LogicalCross opening and breaking of control signal control breaker, realize phase corresponding to each bus in the simulation model that is dynamically connected,Without revising manually the line parameter circuit value of shaft tower or manually adjusting with the many back transmission lines of tower and busThe mode of connection revise the phase sequence arrangement mode of the many back transmission lines of same tower.
Be specifically described as an example of transmission line with four-circuit on single tower example below.
Only retain the detailed electro-magnetic transient model of transmission line with four-circuit on single tower, outside transmission line with four-circuit on single towerPower system carry out equivalence, obtain wait valve system. As shown in Figure 2, in the embodiment of the present invention with tower fourReturn system equivalent wiring schematic diagram. Equivalent method comprises people having the same aspiration and interest equivalent method, mode method method, evaluation methodMethod etc. Fig. 2 is a kind of possible equivalent result formats, wherein Pi+jQi(i=1,2,3,4) represent equivalentLoad, Usi(i=1,2,3,4) represent system equivalent power supply, Zsi(i=1,2,3,4) expression systemEquivalent impedance. 201,202,203,204 buses that are respectively the valve systems such as each interchange, load, system etc.Value machine etc. is connected with bus, and transmission line of electricity is also connected with bus. L1, L2, L3, L4 are common-tower double-return portionPoint, L5 is four times parts of same tower, the line length of L1 to L5 can be different.
In PSCAD/EMTDC platform, build and the corresponding simulation model of Fig. 2 medium value system, this emulationModel by corresponding power supply in PSCAD/EMTDC, load, with the many back transmission lines of tower, bus, open circuitThe electrical element models such as device are formed by connecting. As shown in Figure 3, for feeding back electric wire with tower four in the embodiment of the present inventionLu Zhongyi returns wire and bus connection diagram, wherein in this simulation model, with the many back transmission lines of towerEvery link tester is crossed 3 breakers and is selected be connected one in mutually with the A phase of bus, B phase, C. ?In a certain loop, there are 9 breakers, are respectively the first breaker 301, the second breaker 302, the 3rd opens circuitDevice 303, the 4th breaker 304, the 5th breaker 305, the 6th breaker 306, the 7th breaker 307,The 8th breaker 308, the 9th breaker 309. 310 represent that the wire 1,320 on this loop line road represents this loop lineThe wire 2,330 on road represents the wire 3 on this loop line road. In a known loop line road, there is three-line, a lineIn road, there are three breakers, in a loop line road, have 9 breakers, in four loop line roads, have 36 breakers,In model, add a MultipleRun module simultaneously.
Owing to being transmission line with four-circuit on single tower, in every loop line road, there is phase sequence arrangement mode in 6, four loop line roadsTake out respectively a kind of arrangement mode, have 64, 1296 kinds. Utilize in PSCAD/EMTDC softwareThe phase sequence arrangement mode (totally 1296 kind) of MultipleRun module to transmission line with four-circuit on single tower travels through,And calculate the three-phase current unbalance index under each phase sequence arrangement mode. Traversal mode is as follows:
Before each emulation starts, MultipleRun can export one group of controlled quentity controlled variable, and controlled quentity controlled variable is one group of numerical value,As wherein there being for one time six kinds of phase sequence arrangement modes 111,110,101,100,011,010 to represent respectively: ABC,ACB, BAC, BCA, CAB, CBA. When one group of controlled quentity controlled variable of the each generation of MultipleRun module,A kind of different sortord is extracted in capital from every time, and a kind of arrangement mode is taken out respectively on four loop line roads.Relation according to this controlled quentity controlled variable with the contrast relationship table that prestores, can obtain one group of phase sequence arrangement mode. Such as controlAmount processed is that 111011010101 phase sequences that represent the first loop line road are ABC, and the phase sequence on the second loop line road isCAB, the phase sequence of the third circuit is CBA, the phase sequence on the 4th loop line road is BAC. According to this group phase sequence rowRow mode can produce control signal, is used for controlling the Push And Release of breaker. Such as in the first loop line road,As Fig. 3, the first breaker, the 5th breaker, the 9th breaker closing, other are opens. Make emulationThe each loop line of model road runs on specific phase sequence, and the three-phase current unbalance then calculating under this kind of phase sequence refers toMark. The computational methods of three-phase current unbalance index have a variety of, determine as the case may be. Such as will be withThe zero-sequence current component of tower four back transmission lines is added again divided by 4, gets the average of four back transmission line zero-sequence currentsValue is as three-phase current unbalance index. Certainly, also can be multiplied by necessarily zero-sequence current component as requiredWeight, then calculates three-phase current unbalance index etc. When the emulation having completed under this phase sequence (is calculatedThe three-phase current unbalance index of transmission line with four-circuit on single tower under stable state) after, MultipleRun can autostoreThis three-phase current unbalance index is also adjusted one group of new controlled quentity controlled variable of output, enters under lower a kind of phase sequence modeEmulation, until all phase sequence arrangement mode of transmission line with four-circuit on single tower all emulation complete, whole process does not needWant manual intervention.
When all phase sequence arrangement modes all emulation complete after can to each time record result sort be optimumThe screening of phase sequence arrangement mode. The concrete grammar of sequence can be that each three-phase current unbalance index is arranged by ascending orderRow, the top phase sequence arrangement mode that sorts is phase sequence row corresponding to minimum three-phase current unbalance indexRow mode (optimum phase sequence arrangement mode), the phase sequence arrangement mode of the rear correspondence of sequence is poorer. This process byThe MultipleRun module of PSCAD/EMTDC completes automatically.
When obtaining after optimum phase sequence arrangement mode, will be with the many back transmission lines of tower according to optimum phase sequence arrangement modeEvery is connected corresponding with each bus of circuit. According to this optimum phase sequence arrangement mode link, improve sameEach circuit of the many back transmission lines of tower and the joint efficiency of the corresponding phase of each bus, solved in time with tower four feedbacksThe problem of the three-phase current unbalance that electric line exists in the time of operation.
It is a kind of with the many back transmission lines of tower and busbar connection system that the present invention also provides, and comprising: simulation model mouldPiece, control module, link block,
Emulation module, for obtaining the simulation model of the many back transmission lines of same tower that prestore, reception control signal,According to control signal, every circuit is accessed respectively to phase corresponding to each bus in simulation model, and to control moduleReturn to the response data under stable state, wherein, every link tester in simulation model cross 3 breakers respectively withThe A phase of bus, B phase, C are connected,
Control module, travels through for the phase sequence arrangement mode that prestores to the many back transmission lines of same tower, obtainsOne group of phase sequence arrangement mode; Send described control signal according to phase sequence arrangement mode to simulation model module, connectReceive the described response data that described simulation model module is returned, calculate and store three-phase current unbalance index;After the described phase sequence arrangement mode that prestores has traveled through, determine minimum three in each described three-phase current unbalance indexPhase sequence arrangement mode corresponding to the uneven index of phase current;
Link block, for setting up the every line with the many back transmission lines of tower according to definite phase sequence arrangement modeConnection between phase corresponding to road and each bus.
The many back transmission lines of same tower and the busbar connection system of the present embodiment, control module is by same tower many timesThe phase sequence arrangement mode that prestores of transmission line of electricity travels through, and emulation module is automatically realized every circuit is connect respectivelyEnter phase corresponding to each bus in the simulation model that prestores of the many back transmission lines of same tower, calculate and storage emulation result,It is optimum phase sequence arrangement side that Automatic sieve is selected phase sequence arrangement mode corresponding to minimum three-phase current unbalance indexFormula, improves screening effeciency. According to this optimum phase sequence arrangement mode link, improve with the many back transmission lines of towerThe joint efficiency of each circuit and the corresponding phase of each bus, solved in time transmission line with four-circuit on single tower in the time of operationThe problem of the three-phase current unbalance existing.
In a specific embodiment, prestore simulation model module and control module are based on PSCAD/EMTDCPlatform is set up.
In the present embodiment, before being traveled through, the phase sequence arrangement mode that prestores of the many back transmission lines of same tower needsSet up simulation model, in the many back transmission lines of same same tower, only need to set up one time emulation mouldType calculates with this simulation model, so this simulation model can be prestored later. Then pass throughThe form of obtaining obtains. While setting up simulation model, can, directly by the mode of update routine, refer to controllingEvery circuit of form control and corresponding being connected of each bus in simulation model of order, also can be by prestoringWith every link tester in the simulation model of the many back transmission lines of tower cross 3 breakers respectively with the A phase of bus,B phase, C are connected, and realize every circuit of control corresponding with each bus in simulation model by the form of breakerBe connected. The present embodiment crosses 3 with every the link tester prestoring in simulation model of the many back transmission lines of same towerIndividual breaker describes with the mode that A phase, B phase, the C of bus are connected respectively.
In a specific embodiment, also comprise and set up module, for setting up simulation model. At this embodimentIn, we can model simulation model.
In a specific embodiment, control module comprises MultipleRun module, modular converter, controller,
MultipleRun module, for taking out one group of sortord from each back transmission line respectively, obtains one groupControlled quentity controlled variable, wherein, each back transmission line all has six groups of sortords;
Modular converter is for determining one group of phase sequence arrangement side according to controlled quentity controlled variable and the relation of the contrast relationship table that prestoresFormula;
Controller is for producing control signal according to phase sequence arrangement mode, according to the each breaker of control signal controlBe switched on or switched off phase corresponding to each bus in simulation model.
In the present embodiment, simulation model is set up based on PSCAD/EMTDC platform, in simulation modelAdd a MultipleRun module, MultipleRun module can produce one group of controlled quentity controlled variable at every turn, realizesAutomatically ergodic process. By opening with disconnected of control signal control breaker, realize from being dynamically connected in simulation modelThe phase that each bus is corresponding, without revising manually the line parameter circuit value of shaft tower or manually adjusting many with towerThe mode of connection of back transmission line and bus is revised the phase sequence arrangement mode of the many back transmission lines of same tower.
Be specifically described as an example of transmission line with four-circuit on single tower example below.
Control module only retains the detailed electro-magnetic transient model of transmission line with four-circuit on single tower, and same tower four is fed back to electricityEquivalence is carried out in power system outside circuit, obtains waiting valve system. As shown in Figure 2, be the embodiment of the present inventionIn with four times system equivalent wiring schematic diagrams of tower. Equivalent method comprise people having the same aspiration and interest equivalent method, mode method method,Evaluation method method etc. Fig. 2 is a kind of possible equivalent result formats, wherein Pi+jQi（i=1，2，3，4）The duty values such as expression, Usi(i=1,2,3,4) represent system equivalent power supply, Zsi（i=1，2，3，4）Represent system equivalent impedance. 201,202,203,204 buses that are respectively the valve systems such as each interchange, load,System equivalent machine etc. is connected with bus, and transmission line of electricity is also connected with bus. L1, L2, L3, L4 are same towerDouble back part, L5 is four times parts of same tower, the line length of L1 to L5 can be different.
Emulation module is built and the corresponding emulation mould of Fig. 2 medium value system in PSCAD/EMTDC platformType, this simulation model by corresponding power supply in PSCAD/EMTDC, load, with the many back transmission lines of tower,The electrical element model such as bus, breaker is formed by connecting. As shown in Figure 3, be same tower in the embodiment of the present inventionWire and bus connection diagram in four back transmission lines, wherein in this simulation model, with tower many timesEvery link tester of transmission line of electricity is crossed 3 breakers and is selected one in mutually with the A phase of bus, B phase, CBe connected. In a certain loop, have 9 breakers, be respectively the first breaker 301, the second breaker 302,The 3rd breaker 303, the 4th breaker 304, the 5th breaker 305, the 6th breaker 306, the 7th disconnectedRoad device 307, the 8th breaker 308, the 9th breaker 309. 310 represent the wire 1,320 on this loop line roadRepresent that the wire 2,330 on this loop line road represents the wire 3 on this loop line road. In a known loop line road, there are three lines, there are three breakers on road in a circuit, in a loop line road, have 9 breakers, in four loop line roads, has 36Individual breaker adds a MultipleRun module simultaneously in model.
Owing to being transmission line with four-circuit on single tower, in every loop line road, there is phase sequence arrangement mode in 6, four loop line roadsTake out respectively a kind of arrangement mode, have 64, 1296 kinds. Utilize in PSCAD/EMTDC softwareThe phase sequence arrangement mode (totally 1296 kind) of MultipleRun module to transmission line with four-circuit on single tower travels through,And calculate the three-phase current unbalance index under each phase sequence arrangement mode. Traversal mode is as follows:
Before each emulation starts, MultipleRun can export one group of controlled quentity controlled variable, and controlled quentity controlled variable is one group of numerical value,As wherein there being for one time six kinds of phase sequence arrangement modes 111,110,101,100,011,010 to represent respectively: ABC,ACB, BAC, BCA, CAB, CBA. When one group of controlled quentity controlled variable of the each generation of MultipleRun module,A kind of different sortord is extracted in capital from every time, and a kind of arrangement mode is taken out respectively on four loop line roads.Relation according to this controlled quentity controlled variable with the contrast relationship table that prestores, can obtain one group of phase sequence arrangement mode. Such as controlAmount processed is that 111011010101 phase sequences that represent the first loop line road are ABC, and the phase sequence on the second loop line road isCAB, the phase sequence of the third circuit is CBA, the phase sequence on the 4th loop line road is BAC. According to this group phase sequence rowRow mode can produce control signal, is used for controlling the Push And Release of breaker. Such as in the first loop line road,As Fig. 3, the first breaker, the 5th breaker, the 9th breaker closing, other are opens. Make emulationThe each loop line of model road runs on specific phase sequence, and the three-phase current unbalance then calculating under this kind of phase sequence refers toMark. The computational methods of three-phase current unbalance index have a variety of, determine as the case may be. Such as will be withThe zero-sequence current component of tower four back transmission lines is added again divided by 4, gets the average of four back transmission line zero-sequence currentsValue is as three-phase current unbalance index. Certainly, also can be multiplied by necessarily zero-sequence current component as requiredWeight, then calculates three-phase current unbalance index etc. When the emulation having completed under this phase sequence (is calculatedThe three-phase current unbalance index of transmission line with four-circuit on single tower under stable state) after, MultipleRun can autostoreThis three-phase current unbalance index is also adjusted one group of new controlled quentity controlled variable of output, enters under lower a kind of phase sequence modeEmulation, until all phase sequence arrangement mode of transmission line with four-circuit on single tower all emulation complete, whole process does not needWant manual intervention.
When all phase sequence arrangement modes all emulation complete after can to each time record result sort be optimumThe screening of phase sequence arrangement mode. The concrete grammar of sequence can be that each three-phase current unbalance index is arranged by ascending orderRow, the top phase sequence arrangement mode that sorts is phase sequence row corresponding to minimum three-phase current unbalance indexRow mode (optimum phase sequence arrangement mode), the phase sequence arrangement mode of the rear correspondence of sequence is poorer. This process byThe MultipleRun module of PSCAD/EMTDC completes automatically.
When obtaining after optimum phase sequence arrangement mode, link block, for referring to according to minimum three-phase current unbalanceMark corresponding phase sequence arrangement mode by corresponding with each bus every circuit of the many back transmission lines of same tower being connectedConnect. According to this optimum phase sequence arrangement mode link, improve each circuit and each mother with the many back transmission lines of towerThe joint efficiency of the corresponding phase of line, has solved the three-phase current that transmission line with four-circuit on single tower exists in the time of operation in timeUnbalanced problem.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed,But can not therefore be interpreted as the restriction to the scope of the claims of the present invention. It should be pointed out that for this areaThose of ordinary skill, without departing from the inventive concept of the premise, can also make some distortion andImprove, these all belong to protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be with appendedClaim is as the criterion.
Claims (8)
1. the method being connected with bus with the many back transmission lines of tower, is characterized in that, comprises step:
Obtain the simulation model of the many back transmission lines of same tower that prestore, wherein, in described simulation model everyLink tester is crossed 3 breakers and is connected with A phase, B phase, the C of described bus respectively;
The phase sequence arrangement mode that prestores to the many back transmission lines of same tower travels through, and obtains one group of phase sequence arrangement sideFormula;
According to the each described breaker of described phase sequence arrangement mode control, every circuit is accessed respectively to described emulationPhase corresponding to each bus in model, the three-phase current unbalance index of calculating and storing this simulation model under stable state;
After the described phase sequence arrangement mode that prestores has traveled through, determine in each described three-phase current unbalance indexThe phase sequence arrangement mode that little three-phase current unbalance index is corresponding;
Every circuit setting up the many back transmission lines of described same tower according to described definite phase sequence arrangement mode is with eachConnection between phase corresponding to bus;
The described phase sequence arrangement mode that prestores to the many back transmission lines of same tower travels through, and determines one group of phase sequence rowRow mode step, comprises step:
From each back transmission line, take out respectively one group of phase sequence sortord based on MultipleRun, obtain one groupControlled quentity controlled variable, wherein, each back transmission line all has six groups of phase sequence sortords;
Determine one group of phase sequence arrangement mode according to described controlled quentity controlled variable and the relation of the contrast relationship table that prestores.
2. the method that the many back transmission lines of same tower according to claim 1 are connected with bus, its feature existsIn, described in obtain the simulation model step of the many back transmission lines of same tower that prestore before, also comprise step:
Set up described simulation model based on PSCAD/EMTDC platform.
3. the method that the many back transmission lines of same tower according to claim 1 and 2 are connected with bus, its spyLevy and be, described according to the each described breaker of described phase sequence arrangement mode control, every circuit is accessed respectivelyThe phase step that in described simulation model, each bus is corresponding, comprises step:
Produce control signal according to described phase sequence arrangement mode;
According to the each described closing of power circuit breaker of described control signal control or disconnect each bus pair in described simulation modelThe phase of answering.
4. the method that the many back transmission lines of same tower according to claim 1 are connected with bus, its feature existsIn, described according to the each described breaker of described phase sequence arrangement mode control, described in every circuit is accessed respectivelyThe phase step that in simulation model, each bus is corresponding, comprises step:
Produce control signal according to described phase sequence arrangement mode;
According to the each described closing of power circuit breaker of described control signal control or disconnect each bus pair in described simulation modelThe phase of answering.
5. with the many back transmission lines of tower and a busbar connection system, it is characterized in that, comprising: simulation modelModule, control module, link block,
Described emulation module, for obtaining the simulation model of the many back transmission lines of same tower that prestore, receives and controlsSignal, accesses respectively phase corresponding to each bus in described simulation model according to described control signal by every circuit,And return to the response data under stable state to described control module, and wherein, every circuit in described simulation modelBe connected with A phase, B phase, the C of described bus respectively by 3 breakers,
Described control module, travels through for the phase sequence arrangement mode that prestores to the many back transmission lines of same tower,Obtain one group of phase sequence arrangement mode; Described in sending to described simulation model module according to described phase sequence arrangement modeControl signal, receives the described response data that described simulation model module is returned, and calculates and store three-phase currentUneven index; After the described phase sequence arrangement mode that prestores has traveled through, determine each described three-phase current unbalancePhase sequence arrangement mode corresponding to minimum three-phase current unbalance index in index;
Link block, for setting up the many back transmission lines of described same tower according to described definite phase sequence arrangement modeEvery circuit and phase corresponding to each bus between connection;
Described control module comprises MultipleRun module, modular converter,
Described MultipleRun module is used for taking out one group of phase sequence sortord from each back transmission line respectively,Obtain one group of controlled quentity controlled variable, wherein, each back transmission line all has six groups of phase sequence sortords;
Described modular converter is for determining one group of phase sequence according to described controlled quentity controlled variable and the relation of the contrast relationship table that prestoresArrangement mode.
6. the many back transmission lines of same tower according to claim 5 and busbar connection system, is characterized in that,Also comprise and set up module, for setting up described simulation model.
7. according to the many back transmission lines of same tower and busbar connection system described in claim 5 or 6, its featureBe,
Described control module also comprises controller,
Described controller is for producing control signal according to described phase sequence arrangement mode, according to described control signalControl each described closing of power circuit breaker or disconnect phase corresponding to each bus in described simulation model.
8. according to the many back transmission lines of same tower and busbar connection system described in claim 5 or 6, its featureBe, described simulation model module and described control module are set up based on PSCAD/EMTDC platform.
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| CN101813736A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Distance protection measurement method of double-circuit line on the same pole |
| CN102916427A (en) * | 2012-09-25 | 2013-02-06 | 广东电网公司电力科学研究院 | Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines |
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| US7319576B2 (en) * | 2005-08-18 | 2008-01-15 | Schweitzer Engineering Labortories, Inc. | Apparatus and method for providing differential protection for a phase angle regulating transformer in a power system |
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| CN101813736A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Distance protection measurement method of double-circuit line on the same pole |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |