CN105610158A - Distributed power flow controller and control method therefor - Google Patents

Distributed power flow controller and control method therefor Download PDF

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Publication number
CN105610158A
CN105610158A CN201610083996.6A CN201610083996A CN105610158A CN 105610158 A CN105610158 A CN 105610158A CN 201610083996 A CN201610083996 A CN 201610083996A CN 105610158 A CN105610158 A CN 105610158A
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transformer
phase
current transformer
transmission line
power flow
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CN105610158B (en
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唐爱红
高梦露
潘小军
熊杰
黄涌
赵红生
郑旭
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

A distributed power flow controller and a control method therefor are disclosed. The controller is mounted on a power transmission line, wherein the distributed power flow controller comprises shunt-wound side equipment and series-wound side equipment; each phase of power transmission line is split into multiple split conductors; the series-wound side equipment comprises multiple groups of single-phase power flow compensators connected with each phase of power transmission line in series separately; each group of certain-phase power flow compensators shares a set of converter, controller, current transformer, voltage transformer and communication module; each group of certain-phase power flow compensators also comprises multiple single-turn transformers matched with the number of the split conductors; and the alternating current side of the corresponding converter is connected to each split conductor through each single-turn transformer separately. The control method is carried out by the steps of comparing the each-phase transmission power target value with an actually collected and calculated transmission power parameter difference value; trigging control on the converter; optimizing and switching switch sequences of the converter; and realizing transmission power compensation for the power transmission line. According to the distributed power flow controller and the control method therefor, the transmission power of the power transmission system with multiple split conductors is realized; due to the control method, balanced power flow distribution is achieved; and the flexibility and reliability of equipment control are improved.

Description

A kind of Distributed Power Flow controller and control method thereof
Technical field
The invention belongs to operation and control of electric power system technical field, relate in particular to a kind of Distributed Power Flow controller and controlling party thereofMethod, is applicable to multiple fission conductor, for promoting Transmission Lines power capability.
Background technology
At present, interconnected, the extra-high voltage alternating current-direct current of China's large regional grid, long-distance and large-capacity power transmission general layout basically form. Along with extra-high-speedThe planning construction of pressing, China's electrical network will present 1000,500,220 kilovolts of tertiary voltage grade electromagnetic looped networks and hand over direct connection series-parallel connectionThe electric network composition of complicated kenel. The key transmission cross-section that the existence of electromagnetic looped network and the NATURAL DISTRIBUTION of trend often make electrical network is justThe phenomenon that has trend skewness after normal and accident, limited section entirety conveying capacity, seeks a kind of ability to transmit electricity that improvesFlow control method is extremely urgent.
THE UPFC UPFC (unifiedpowerflowcontroller) is the trend control dress that current function is the most powerfulPut, it is regulated and can or be realized independently electric power simultaneously by the line impedance to power system, voltage phase angle and voltage magnitudeThe control of system busbar voltage, circuit active power trend, reactive power trend and system stability. But due to its cost and canBy property problem, it is applied and is restricted. Study a kind of power both with UPFC, its reliability and cost again canThe flow control method of being accepted extensively by power system has very important meaning to China's power economy sustainable development.
Distributed Power Flow controller (DPFC, distributedpowerflowcontroller) is straight by passing through in UPFC original structureThe connection in series-parallel current transformer that stream electric capacity connects separates and utilizes distributed static series compensator (DSSC, distributedstaticseriesCompensator) thought is series side distribution, on this topological structure basis, by 3 subharmonic connection in series-parallel current transformer itThereby between exchange active power and reach the object of comprehensive adjustment Line Flow, its three-phase line chart is as shown in Figure 1. Side in parallel is by twoIndividual back-to-back 3-phase power converter 8, single-phase converter 6 form, and 3-phase power converter 8, single-phase converter 6 are by a public direct-currentElectric capacity 7 is connected. By the head end Y-△ transformer 1 of a coupling, line voltage is linked into the AC of 3-phase power converter 8,3-phase power converter 8 absorbs the active power of electrical network and carrys out stable DC capacitance voltage; Single-phase converter 6 is exported a certain size three timesHarmonic current, this electric current is evenly distributed in transmission line of electricity 2 via the neutral point of the Y side of head end Y-△ transformer 1. Series sideMultiple current transformers 11 access transmission line of electricity 2 by single-turn transformer 3, according to the instruction of its controller, absorb on the one hand power transmission lineTriple harmonic current on road 2, in order to maintain the stable of selfcapacity voltage; On the other hand according to actual power back-off demand,Produce the fundamental frequency alternating voltage of certain amplitude and phase place, series converter 11 voltages and the 1 voltage stack of circuit head end Y-△ transformerTogether, change the trend of circuit with this. Because triple harmonic current is intercepted by the △ side of head end Y-△ transformer 1, cannotCirculation, thereby form loop after the neutral ground of the Y side of end Y-△ transformer 4.
But topological structure, control method, the installation method to the DPFC research that launch at present are all only adapted to non-division and leadLine, and 1000kV, 500kV, 220kV system adopt split conductor more, 500kV and above system adopts 4 divisions, 6Split conductor.
Summary of the invention
The technical problem to be solved in the present invention is in view of the foregoing defects the prior art has, to provide one to be applicable to many divisions and leadDistributed Power Flow controller and the control method thereof of line, controller is effectively realized the transmission system through-put power of multiple fission conductor, controlIt is comparatively balanced that method processed distributes trend, improves equipment control flexibility and reliability.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Distributed Power Flow controller, is arranged on transmission line of electricity, and transmission line of electricity two ends are provided with head end Y-△ transformer and endEnd Y-△ transformer, this controller comprises side apparatus in parallel and series side equipment, side apparatus in parallel comprises the three-phase arranging back-to-backCurrent transformer, single-phase converter, be parallel with DC capacitor, three between the DC side of 3-phase power converter and the DC side of single-phase converterThe AC of phase current transformer enters transmission line of electricity by the △ side joint of head end Y-△ transformer, and the AC of single-phase converter passes through head endThe neutral point access transmission line of electricity of the Y side of Y-△ transformer; Every phase transmission line of electricity splits into some split conductors, described series connectionSide apparatus comprises the many groups of trend compensators that are connected on every phase transmission line of electricity, every group of trend compensator comprise current transformer, with divisionSeveral single-turn transformers, controller, current transformer, voltage transformer and the communication module of wire radical coupling, certain group is sameMultiple single-turn transformers of one phase multiple fission conductor share a set of current transformer, controller, current transformer, voltage transformer and logicalLetter module, the AC of current transformer accesses respectively each split conductor by each single-turn transformer, and current transformer and voltage are mutualSensor is arranged on wherein on a split conductor, and current transformer is connected with the input of controller with voltage transformer, controllerOutput be connected with the DC side of transformer, communication module is connected with input and the voltage transformer of controller simultaneously.
Press such scheme, described current transformer is made up of switching tube and diode, described switching tube by four, form single-phase full bridge electricityRoad; Diode of inverse parallel on each switching tube.
Press such scheme, certain group trend compensator that certain of described series side equipment goes up is mutually integrated in a casing, each in casingIndividual single-turn transformer adopts eccentric installation to snap in respectively each split conductor of certain phase transmission line of electricity, and by connecting line and controllerBe connected with current transformer; Communication module, controller and current transformer are integrated on the integration module in casing.
The present invention also provides a kind of control method of above-mentioned Distributed Power Flow controller, and transmission line of electricity is erected on strain rod towerCoordinate head end Y-△ transformer and end Y-△ transformer to form transmission system, control method comprises the steps:
S1, establish every phase transmission line of electricity n group trend compensator be installed, the 3-phase power converter of transmission system by side apparatus in parallel toDC capacitor is charged to desired value Vshdcref, be charged to desired value to 3n current transformer DC capacitor of series side equipment simultaneouslyVsedcref(n)；
S2, detect electric current and the voltage of certain root split conductor of every phase transmission line of electricity by current transformer, voltage transformer, andThe electric current collecting and voltage signal are sent into controller;
S3, the radical of establishing split conductor are m, the electric current that current transformer is detected be multiplied by m (each group of this place split conductor symmetry,Voltage equates, electric current equates), then the voltage signal detecting with voltage transformer is combined the signal of communication module and is carried out in controllerPower calculation;
S4, the data input current transformer that step S3 is calculated, trigger control to current transformer;
S5, data same form m part that step S4 current transformer is exported send to respectively each single-turn transformer;
The single-phase converter of S6, side apparatus in parallel provides and maintains DC voltage V to current transformerdc3 constant subharmonic current ish；
S7, by switching the sequence of all switching tube place in circuit times in the current transformer one-period of each group of trend compensator, obtainObtain step S5 and the required parameter value of S6.
Press such scheme, step S3 is specially: obtained and dispatched by transmission system the transmission line of electricity calculating and divide by communication moduleThe required transmission power target value P of each split conductorLref、QLref, controller is adopted in conjunction with current transformer, voltage transformerThe calculated signals of collection obtains the transmission power parameters P of certain root split conductorL、QL, calculate Δ P=PLref-PL，ΔQ＝QLref-QL；, in step S4, the active power that on single-phase transmission line of electricity, the current transformer of every group of trend compensator provides to transmission system isΔ P/ (3n); In step S5, it is Δ P/ (3mn), Δ Q/ (3mn) that each single-turn transformer provides to transmission system the power being coupled into.
Press such scheme, step S7 realizes the orderly switching of each trend compensator switch by the time value that changes each switching tube and open,Be specially for one machine infinity bus system: consider external disturbance and inner parameter uncertainty, utilize the switching PCH described in following formulaSystem draws the switching sequence of the converter switches of each trend compensator:
x · = [ J λ ( t ) ( x , p ) - R λ ( t ) ( x , p ) ] ▿ H λ ( t ) ( x , p ) + g λ ( t ) x ( x ) u + g ‾ λ ( t ) ( x ) ω , z = h λ ( t ) ( x ) g λ ( t ) T ( x ) ▿ H λ ( t ) ( x ) , x ( t 0 ) = x 0 - - - ( 1 )
In formula, x is generator amature angle, rotor velocity, and generator electromotive force, Distributed Power Flow controller series side is to defeatedFundamental current real component and idle component that the fundamental voltage amplitude that electric system injects is injected with phase angle, side direction transmission system in parallel,Affect the state variable vector such as first-harmonic and 3 subharmonic active power electric currents of connection in series-parallel current transformer DC capacitor voltage; P is transmission of electricityThe unknown vector that systematic parameter is disturbed; ω is external disturbance; Z penalizes signal; hλ(t)(x) be weight matrix; Jλ(t)(x, p) serves as reasonsThe system structure parameter of the Distributed Power Flow controller that toggle path determines and one machine infinity bus system composition; Rλ(t)(x, p) serves as reasons and cutsChange the system consumption parameter that path determines; Hλ(t)(x) be each converter system Hamilton function corresponding between active region;Mapping λ (t): [t0,+∞) and → Λ=1,2 ..., N} is a segmentation right continuous function, is switching rate; x0For this system transient modelling equalization point; U is feedback rate control.
Press such scheme, when certain single-turn transformer on multiconductor bundles damages, by the company of current transformer and this single-turn transformerLink disconnects, and other parts continue normally to provide required compensation power to transmission system.
Press such scheme, when certain single-turn transformer damages, this phase remaining single-turn transformer that current transformer connects on the same group toThe power that system provides is Δ P/ (3mn-1), Δ Q/ (3mn-1).
Compared with prior art, beneficial effect of the present invention: the transmission system that controller of the present invention is effectively realized multiple fission conductor passesDefeated power, adopt switchgear ripe, cheap, that can produce in batches form replaceable, can build in batches, reliability is highTrend control; Adopt multiple small capacity transformers, can further reduce equipment investment; Control method distributes comparatively trendEquilibrium, improves equipment control flexibility and reliability.
Brief description of the drawings
Fig. 1 is the structural representation of Distributed Power Flow controller on single-phase transmission line of electricity in prior art;
Fig. 2 is the structural representation of Distributed Power Flow controller access transmission system of the present invention;
Fig. 3 is the structural representation of every group of trend compensator of the series side equipment of Distributed Power Flow controller of the present invention;
Fig. 4 is that trend compensator of the present invention is arranged on the structural representation in casing;
In figure, 1. head end Y-△ transformer; 2. transmission line of electricity; 3. single-turn transformer; 4. end Y-△ transformer; 5. trend compensationDevice; 6. single-phase converter; 7. DC capacitor; 8. 3-phase power converter; 9. the first single-turn transformer; 10. the second single-turn transformer; 11.Current transformer; 12. controllers; 13. current transformers; 14. voltage transformers; 15. first division wires; 16. second split conductors;17. strain rod towers; 18. integration modules; 19. communication modules.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, with 2 pointsSplitting wire is example, and the present invention is further elaborated.
Shown in Fig. 1～Fig. 4, Distributed Power Flow controller of the present invention, is arranged on transmission line of electricity 2 transmission line of electricityTwo ends are provided with head end Y-△ transformer 1 and end Y-△ transformer 4, and this controller comprises side apparatus in parallel and series side equipment,Side apparatus in parallel comprises 3-phase power converter 8, the single-phase converter 6, the DC side of 3-phase power converter 8 and the single-phase change that arrange back-to-backBetween the DC side of stream device 6, be parallel with DC capacitor 7, the AC of 3-phase power converter 8 is by the △ of head end Y-△ transformer 1Side joint enters transmission line of electricity 2, and the AC of single-phase converter 6 is by the neutral point access transmission of electricity of the Y side of head end Y-△ transformer 1Circuit 2;
Every phase transmission line of electricity 2 splits into two, is respectively first division wire 15, the second split conductor 16; Series side equipment bagDraw together the many groups of trend compensators 5 that are connected on every phase transmission line of electricity 2, every group of trend compensator 5 comprises current transformer 11, the first listTurns transformer 9, the second single-turn transformer 10, controller 12, current transformer 13, voltage transformer 14 and communication module 19;The first single-turn transformer 9 and second single-turn transformer 10 of certain the group trend compensator 5 on every phase transmission line of electricity 2 share a set of changeStream device 11, controller 12, current transformer 13, voltage transformer 14 and communication module 19, the AC of current transformer 11 is logicalCross the first single-turn transformer 9 and the second single-turn transformer 10 and access respectively first division wire 15, the second split conductor 16, electricityCurrent transformer 13 and voltage transformer 14 are arranged on first division wire 15, current transformer 13 and voltage transformer 14 withThe input of controller 12 connects, and the output of controller 12 is connected with the DC side of transformer 11, and communication module 19 simultaneouslyBe connected with input and the voltage transformer 14 of controller 12.
Current transformer 11 is made up of switching tube and diode, and switching tube has four, composition single-phase full bridge circuit; Anti-on each switching tubeA diode in parallel, plays afterflow.
The concrete mounting means of Distributed Power Flow controller of the present invention: side apparatus in parallel is accessed to transmission system by shown in Fig. 1, willCurrent transformer 11 ACs of the series side equipment in Fig. 4 on every phase transmission line of electricity 2 are drawn two groups of equalizing signal access first divisions and are ledThe secondary of the second single-turn transformer 10 of the secondary of the first single-turn transformer 9 of line 15 and the second split conductor 16; By Fig. 4 instituteCertain group trend compensator 5 that certain of the series side equipment showing goes up is mutually integrated in a casing, as shown in Figure 4, and casing interior firstSingle-turn transformer 9 and the second single-turn transformer 10 adopt the eccentric first division wire that snaps in respectively certain phase transmission line of electricity 2 of installing15, the second split conductor 16, and be connected with current transformer 11 with controller 12 by connecting line; Communication module 10, controller12 and current transformer 11 be integrated on the integration module 18 in casing; Finally by integrated as the casing of Fig. 4, access by shown in Fig. 2In every phase transmission line of electricity 2.
In Fig. 4, the iron core of the first single-turn transformer 9 and the second single-turn transformer 10 is divided into the first iron core piece and the second iron core piece twoPart, first takes away the second iron core piece, and controlled first division wire 15, the second split conductor 16 are snapped in to the first iron corePiece, then the second iron core piece that closes, casing closes.
The present invention is applicable to the control method of the Distributed Power Flow controller of multiple fission conductor, and transmission line of electricity 2 is erected to tension-resistant rodOn tower 17, coordinate head end Y-△ transformer 1 and end Y-△ transformer 4 to form transmission system, control method comprises the steps:
S1, establish every phase transmission line of electricity 2 n group trend compensator 5 has been installed, transmission system is by the three-phase of Fig. 1 side apparatus in parallelCurrent transformer 8 is charged to desired value V to DC capacitor 7shdcref, the while is to 3n current transformer 11 DC capacitors of series side equipmentBe charged to desired value Vsedcref(n)；
S2, detect the electric current of the first division wire 15 of every phase transmission line of electricity 2 by current transformer 13, voltage transformer 14And voltage, and the electric current collecting and voltage signal are sent into controller 12;
S3, the electric current that current transformer 13 is detected are multiplied by 2 (because this place's first division wire 15 and the second split conductors 16Voltage equates, electric current equates), then the voltage signal detecting with voltage transformer 14 is combined the signal of communication module 19 at controllerIn 12, carry out power calculation: by communication module 19 obtain dispatch by transmission system that the transmission line of electricity 2 that calculates divides firstSplit conductor 15, the required transmission power target value P of the second split conductor 16Lref、QLref, controller is in conjunction with current transformer13, the calculated signals that voltage transformer 14 gathers obtains the transmission power parameters of first division wire 15, the second split conductor 16PL、QL, calculate Δ P=PLref-PL，ΔQ＝QLref-QL；
S4, the data input current transformer 11 that step S3 is calculated, trigger control to current transformer 11, single-phase power transmission lineThe active power that on road 2, the current transformer 11 of every group of trend compensator 5 provides to transmission system is Δ P/ (3n);
S5, the data that step S4 current transformer 11 is exported send to respectively the first single-turn transformer 9 and the second single turn in duplicateTransformer 10, in Fig. 4, the first single-turn transformer 9 and the second single-turn transformer 10 provide the power being coupled into transmission systemFor Δ P/ (6n), Δ Q/ (6n);
In S6, Fig. 1, the single-phase converter 6 of side apparatus in parallel provides and maintains DC voltage V to current transformer 11 in Fig. 4dcConstant3 subharmonic current ish；
S7, by switching the sequence of all switching tube place in circuit times in current transformer 11 one-periods of each group of trend compensator 5,Obtain step S5 and the required parameter value of S6, realize each trend by above-mentioned switching law by the time value that changes each switching tube and openThe orderly switching of compensator switch, is specially for one machine infinity bus system: consider external disturbance and inner parameter uncertainty,Utilize the described switching PCH system of formula (1) to draw the switching sequence of each trend compensator 5 switches of Distributed Power Flow controller.
On two split conductors, certain single-turn transformer damages, current transformer 11 and the connection line of this single-turn transformer are disconnected, itsIts parts continues normally to provide required compensation power to transmission system. Suppose that certain single-turn transformer damages, this becomes mutually on the same groupThe power that the remaining single-turn transformer that stream device connects provides to system is Δ P/ (6n-1), Δ Q/ (6n-1).
The present invention adopts optimum switchover policy to realize the coordination optimization control of each compensator, and switching law is all switches in one-periodThe sequence of pipe place in circuit time, realizes the orderly switching of each compensator switch by changing time value that each switching tube opens. ContainThe power system of Distributed Power Flow control device has very complicated dynamics form, the present invention is directed to one machine infinity bus system,The method of the switching sequence of each trend compensator 5 switches is provided according to formula (1).
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and instituteThere are these improvement and conversion all should belong to the protection domain of claims of the present invention.

Claims (8)

1. a Distributed Power Flow controller, is arranged on transmission line of electricity, and transmission line of electricity two ends are provided with head end Y-△ transformer and endY-△ transformer, this controller comprises side apparatus in parallel and series side equipment, side apparatus in parallel comprises three phase transformations that arrange back-to-backStream device, single-phase converter, be parallel with DC capacitor, three-phase between the DC side of 3-phase power converter and the DC side of single-phase converterThe AC of current transformer enters transmission line of electricity by the △ side joint of head end Y-△ transformer, and the AC of single-phase converter is by head end Y-The neutral point access transmission line of electricity of the Y side of △ transformer, is characterized in that, every phase transmission line of electricity splits into some split conductors,Described series side equipment comprises the many groups of trend compensators that are connected on every phase transmission line of electricity, every group of trend compensator comprise current transformer,Several single-turn transformers, controller, current transformer, voltage transformer and the communication module of mating with split conductor radical,Certain some single-turn transformer of organizing on every phase multiple fission conductor shares a set of current transformer, controller, current transformer, mutual induction of voltageDevice and communication module, the AC of current transformer accesses respectively each split conductor by each single-turn transformer, current transformer andVoltage transformer is arranged on wherein on a split conductor, and current transformer is connected with the input of controller with voltage transformer,The output of controller is connected with the DC side of transformer, and communication module connects with input and the voltage transformer of controller simultaneouslyConnect.
2. Distributed Power Flow controller according to claim 1, is characterized in that, described current transformer is by switching tube and diode groupBecome, described switching tube by four, form single-phase full bridge circuit; Diode of inverse parallel on each switching tube.
3. Distributed Power Flow controller according to claim 1, is characterized in that, certain group that certain of described series side equipment goes up mutuallyTrend compensator is integrated in a casing, and in casing, each single-turn transformer adopts eccentric installation to snap in respectively certain phase transmission line of electricityEach split conductor, and be connected with current transformer with controller by connecting line; Communication module, controller and current transformer are integrated inOn integration module in casing.
4. a control method for the Distributed Power Flow controller as described in one of as any in claim 1～3, is erected at transmission line of electricity resistance toOn tension rod tower, coordinate head end Y-△ transformer and end Y-△ transformer to form transmission system, it is characterized in that, control method comprisesFollowing steps:
S1, establish every phase transmission line of electricity n group trend compensator be installed, the 3-phase power converter of transmission system by side apparatus in parallel toDC capacitor is charged to desired value Vshdcref, be charged to desired value to 3n current transformer DC capacitor of series side equipment simultaneously Vsedcref(n)；
S2, detect electric current and the voltage of certain root split conductor of every phase transmission line of electricity by current transformer, voltage transformer, andThe electric current collecting and voltage signal are sent into controller;
S3, the radical of establishing split conductor are m, the electric current that current transformer is detected is multiplied by m, then detect with voltage transformerVoltage signal carries out power calculation in conjunction with the signal of communication module in controller;
S4, the data input current transformer that step S3 is calculated, trigger control to current transformer;
S5, data same form m part that step S4 current transformer is exported send to respectively each single-turn transformer;
The single-phase converter of S6, side apparatus in parallel provides and maintains DC voltage V to current transformerdc3 constant subharmonic current ish；
S7, by switching the sequence of all switching tube place in circuit times in the current transformer one-period of each group of trend compensator, obtainObtain step S5 and the required parameter value of S6.
5. the control method of Distributed Power Flow controller according to claim 4, is characterized in that, step S3 is specially: logicalCross communication module and obtain the each transmission power target that split conductor is required of being dispatched the transmission line of electricity division calculating by transmission systemValue PLref、QLref, controller obtains the biography of certain root split conductor in conjunction with the calculated signals of current transformer, voltage transformer collectionDefeated power parameter PL、QL, calculate Δ P=PLref-PL，ΔQ＝QLref-QL; In step S4, every group of tide on single-phase transmission line of electricityThe active power that the current transformer of stream compensator provides to transmission system is Δ P/ (3n); In step S5, each single-turn transformer is to defeatedIt is Δ P/ (3mn), Δ Q/ (3mn) that electric system provides the power being coupled into.
6. the control method of Distributed Power Flow controller according to claim 4, is characterized in that, step S7 is each by changingThe time value that switching tube is opened realizes the orderly switching of each trend compensator switch, is specially for one machine infinity bus system: considerExternal disturbance and inner parameter uncertainty, utilize switching PCH system described in following formula to show that the current transformer of each trend compensator leavesThe switching sequence closing:
x · = [ J λ ( t ) ( x , p ) - R λ ( t ) ( x , p ) ] ▿ H λ ( t ) ( x , p ) + g λ ( t ) x ( x ) u + g ‾ λ ( t ) ( x ) ω , z = h λ ( t ) ( x ) g λ ( t ) T ( x ) ▿ H λ ( t ) ( x ) , x ( t 0 ) = x 0 - - - ( 1 )
In formula, x is generator amature angle, rotor velocity, and generator electromotive force, Distributed Power Flow controller series side is to defeatedFundamental current real component and idle component that the fundamental voltage amplitude that electric system injects is injected with phase angle, side direction transmission system in parallel,Affect the state variable vector such as first-harmonic and 3 subharmonic active power electric currents of connection in series-parallel current transformer DC capacitor voltage; P is transmission of electricityThe unknown vector that systematic parameter is disturbed; ω is external disturbance; Z penalizes signal; hλ(t)(x) be weight matrix; Jλ(t)(x, p) serves as reasonsThe system structure parameter of the Distributed Power Flow controller that toggle path determines and one machine infinity bus system composition; Rλ(t)(x, p) serves as reasons and cutsChange the system consumption parameter that path determines; Hλ(t)(x) be each converter system Hamilton function corresponding between active region;Mapping λ (t): [t0,+∞) and → Λ=1,2 ..., N} is a segmentation right continuous function, is switching rate; x0For this system transient modelling equalization point; U is feedback rate control.
7. the control method of Distributed Power Flow controller according to claim 4, is characterized in that, when on multiconductor bundles certainIndividual single-turn transformer damages, and the connection line of current transformer and this single-turn transformer is disconnected, and other parts continue normally to transmission of electricitySystem provides required compensation power.
8. the control method of Distributed Power Flow controller according to claim 4, is characterized in that, when certain single-turn transformer damagesBad, the power that this phase remaining single-turn transformer that current transformer connects on the same group provides to system be Δ P/ (3mn-1),ΔQ/(3mn-1)。
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