CN105610158B - A kind of Distributed Power Flow controller and its control method - Google Patents

A kind of Distributed Power Flow controller and its control method Download PDF

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Publication number
CN105610158B
CN105610158B CN201610083996.6A CN201610083996A CN105610158B CN 105610158 B CN105610158 B CN 105610158B CN 201610083996 A CN201610083996 A CN 201610083996A CN 105610158 B CN105610158 B CN 105610158B
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current transformer
transformer
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electricity
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CN105610158A (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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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002Flicker reduction, e.g. compensation of flicker introduced by non-linear load

Abstract

A kind of Distributed Power Flow controller and its control method, controller is installed on transmission line of electricity, including side apparatus in parallel and series connection side apparatus, some split conductors are split into per phase transmission line of electricity, series connection side apparatus includes multigroup single-phase trend compensator being connected on every phase transmission line of electricity, every group of certain phase trend compensator shares a set of current transformer, controller, current transformer, voltage transformer and communication module, every group of certain phase trend compensator further includes and the matched some single-turn transformers of split conductor radical, the exchange side of current transformer is respectively connected to each split conductor by each single-turn transformer.The difference for the transmission power parameters that control method is calculated by more each phase transmission power target value and actual acquisition, triggers current transformer and controls, and optimization switches each converter switches sequence, realizes the transimission power compensation of transmission line of electricity.The transmission system transimission power of the invention for effectively realizing multiple fission conductor, control method trend distributing equilibrium, improves equipment control flexibility and reliability.

Description

A kind of Distributed Power Flow controller and its control method
Technical field
The invention belongs to operation and control of electric power system technical field, more particularly to a kind of Distributed Power Flow controller and its Control method, suitable for multiple fission conductor, for lifting Transmission Lines power capability.
Background technology
At present, China's interconnection power system, extra-high voltage alternating current-direct current, long-distance and large-capacity power transmission general layout basically form.With The planning construction of extra-high voltage, China's power grid will be presented 1000,500,220 kilovolts of tertiary voltage level electromagnetic looped networks and hand over direct connection to mix The electric network composition of the complicated kenel of connection.The presence of electromagnetic looped network and the NATURAL DISTRIBUTION of trend often cause the key transmission of power grid to break Face, there are the phenomenon of trend skewness, limits section entirety conveying capacity after normal and accident, and it is defeated to seek a kind of raising The flow control method of electric energy power is extremely urgent.
THE UPFC UPFC (unified power flow controller) is that current function is the most powerful Tidal current controller, it can be at the same time or only by the way that the line impedance of electric system, voltage phase angle and voltage magnitude are adjusted On the spot realize the control that electrical system bus voltage, circuit active power flow, reactive power trend and system are stablized.But by It is restricted in its cost and integrity problem its popularization and application.A kind of power both with UPFC is studied, its is reliable Property and cost can be had again by the flow control method that electric system accepts extensively to China's power economy sustainable development it is extremely heavy The meaning wanted.
Distributed Power Flow controller (DPFC, distributed power flow controller) is by the original knots of UPFC In structure by DC capacitor connect connection in series-parallel current transformer separate and utilize distribution static series compensator (DSSC, Distributed static series compensator) thought by series side distribution, on topological structure basis On, active power is exchanged so as to achieve the purpose that comprehensive adjustment Line Flow between connection in series-parallel current transformer by 3 subharmonic, its Three-phase line chart is as shown in Figure 1.Side in parallel is made of two back-to-back 3-phase power converters 8, single-phase converters 6, three-phase unsteady flow Device 8, single-phase converter 6 are connected by a public direct-current capacitance 7.It is by the head end Y- △ transformers 1 of a coupling that power grid is electric Pressure is linked into the exchange side of 3-phase power converter 8, and the active power that 3-phase power converter 8 absorbs power grid carrys out stable DC capacitance voltage; Single-phase converter 6 export a certain size triple harmonic current, the electric current via the Y sides of head end Y- △ transformers 1 neutral point It is evenly distributed in transmission line of electricity 2.The multiple current transformers 11 of series side access transmission line of electricity 2 by single-turn transformer 3, according to its control The instruction of device processed, on the one hand absorbs the triple harmonic current on transmission line of electricity 2, to maintain the stabilization of selfcapacity voltage;Separately On the one hand according to actual power back-off demand, the fundamental frequency alternating voltage of certain amplitude and phase, the electricity of series converter 11 are produced Together with pressure and 1 voltage superposition of circuit head end Y- △ transformers, change the trend of circuit with this.Due to triple harmonic current quilt The △ sides barrier of head end Y- △ transformers 1, can not circulate, thus after the neutral ground of the Y sides of end Y- △ transformers 4 Forming circuit.
But that is unfolded at present is only adapted to nondividing to the topological structure of DPFC researchs, control method, installation method Conducting wire, and 1000kV, 500kV, 220kV system use split conductor more, 500kV and system above are more using 4 divisions, 6 divisions Conducting wire.
The content of the invention
The technical problem to be solved in the present invention is in view of the foregoing defects the prior art has, there is provided one kind is suitable for more The Distributed Power Flow controller and its control method of split conductor, controller effectively realize the transmission system transmission of multiple fission conductor Power, control method make it that trend distribution is more balanced, improve equipment control flexibility and reliability.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of Distributed Power Flow controller, on transmission line of electricity, transmission line of electricity is provided at both ends with head end Y- △ transformations Device and end Y- △ transformers, the controller include side apparatus in parallel and series connection side apparatus, and side apparatus in parallel includes setting back-to-back 3-phase power converter, the single-phase converter put, are parallel with straight between the DC side of 3-phase power converter and the DC side of single-phase converter Galvanic electricity is held, and the exchange side of 3-phase power converter enters transmission line of electricity, the friendship of single-phase converter by the △ side joints of head end Y- △ transformers Flow side and transmission line of electricity is accessed by the neutral point of the Y sides of head end Y- △ transformers;Some divisions are split into per phase transmission line of electricity Conducting wire, the series connection side apparatus include multigroup trend compensator being connected on every phase transmission line of electricity, every group of trend compensator bag Include current transformer, with several matched single-turn transformers of split conductor radical, controller, current transformer, voltage transformer and Communication module, certain multiple single-turn transformer for organizing same phase multiple fission conductor share a set of current transformer, controller, Current Mutual Inductance Device, voltage transformer and communication module, the exchange side of current transformer are respectively connected to each split conductor by each single-turn transformer, Current transformer and voltage transformer are disposed therein on a split conductor, current transformer and voltage transformer and controller Input terminal connection, the DC side of the output terminal of controller and transformer connects, the communication module input terminal with controller at the same time And voltage transformer connection.
By such scheme, the current transformer is made of switching tube and diode, the switching tube by four, form it is single-phase complete Bridge circuit;One diode of inverse parallel on each switching tube.
By such scheme, certain group trend compensator in certain phase of the series connection side apparatus is integrated in a babinet, case Internal each single-turn transformer uses eccentrically mounted each split conductor for being respectively clamped into certain phase transmission line of electricity, and passes through connecting line It is connected with controller and current transformer;Communication module, controller and current transformer are integrated on the integration module in babinet.
Present invention also offers a kind of control method of above-mentioned Distributed Power Flow controller, by electric transmission line erection in strain insulator Head end Y- △ transformers and end Y- △ transformers is coordinated to form transmission system on shaft tower, control method includes the following steps:
S1, set every phase transmission line of electricity and be mounted with n group trend compensators, the three-phase unsteady flow that transmission system passes through side apparatus in parallel Device is charged to desired value V to DC capacitorshdcref, while it is charged to target to 3n current transformer DC capacitor of series connection side apparatus Value Vsedcref(n)
S2, pass through the electric current and electricity of current transformer, voltage transformer detection per certain root split conductor of phase transmission line of electricity Pressure, and the electric current collected and voltage signal are sent into controller;
S3, set the radical of split conductor as m, and the electric current that current transformer detects is multiplied by m (each group split conductors pair at this Title, voltage are equal, and electric current is equal), then with the signal of the voltage signal combination communication module of voltage transformer detection in controller Middle carry out power calculation;
S4, the data that step S3 is calculated input current transformer, and triggering control is carried out to current transformer;
S5, by step S4 current transformers export m parts of one formula of data be sent respectively to each single-turn transformer;
S6, the single-phase converter of side apparatus in parallel provide to current transformer and maintain DC voltage Vdc3 constant subharmonic currents ish
The sequence of all switching tube access circuit times in S7, the current transformer a cycle by switching each group trend compensator Row, obtain the parameter value needed for step S5 and S6.
By such scheme, step S3 is specially:The power transmission line calculated by transmission system scheduling is obtained by communication module Transmission power target value P needed for each split conductor of road divisionLref、QLref, controller combination current transformer, voltage are mutual The transmission power parameters P of certain root split conductor is calculated in the signal of sensor collectionL、QL, calculate Δ P=PLref-PL, Δ Q= QLref-QL;Then in step S4, the current transformer of every group of trend compensator is provided to transmission system in single-phase power transmission line wattful power Rate is Δ P/ (3n);In step S5, it is Δ P/ (3mn), Δ that each single-turn transformer, which provides the power being coupled into transmission system, Q/(3mn)。
By such scheme, step S7 realizes having for each trend compensator switch by varying the time value that each switching tube is opened Sequence switches, and is specially for one machine infinity bus system:Consider that external disturbance and inner parameter are uncertain, using described in following formula Switching PCH systems draw the switching sequence of the converter switches of each trend compensator:
In formula, x is generator amature angle, and rotor velocity, generator potential, the series connection of Distributed Power Flow controller is laterally Fundamental voltage amplitude and the phase angle of transmission system injection, the fundamental current active component in parallel laterally that transmission system is injected with it is idle Component, influences the state variable vectors such as fundamental wave and the 3 subharmonic active power electric currents of connection in series-parallel current transformer DC capacitor voltage;p For the unknown vector of transmission system parameter perturbation;ω is external disturbance;Z is to penalize signal;hλ(t)(x) it is weight matrix;Jλ(t)(x,p) The system structure parameter formed for the Distributed Power Flow controller and one machine infinity bus system that are determined by toggle path;Rλ(t)(x, P) the system consumption parameter to be determined by toggle path;Hλ(t)(x) it is the corresponding each converter system Hamilton in effect section Function;Map λ (t):[t0,+∞) and → Λ={ 1,2 ..., N } be a segmentation right continuous function, For switching rate;x0For the system transient modelling equalization point;U is feedback rate control.
By such scheme, when some single-turn transformer damage on multiconductor bundles, then by current transformer and the single turn transformation The connection circuit of device disconnects, and other components continue normally to provide required compensation power to transmission system.
By such scheme, when some single-turn transformer damages, then the remaining single turn that the identical group of current transformer is connected becomes Depressor to the power that system provides be Δ P/ (3mn-1), Δ Q/ (3mn-1).
Compared with prior art, beneficial effects of the present invention:Controller of the present invention effectively realizes the transmission of electricity of multiple fission conductor System transimission power, is formed replaceable, can building in batches, reliable using switchgear that is ripe, cheap, can producing in batches The high power flowcontrol of property;Using multiple small capacity transformers, equipment investment can be further reduced;Control method causes trend to be distributed It is more balanced, improve equipment control flexibility and reliability.
Brief description of the drawings
Fig. 1 is structure diagram of the Distributed Power Flow controller in single-phase power transmission line in the prior art;
Fig. 2 is the structure diagram of Distributed Power Flow controller access transmission system of the present invention;
Fig. 3 is the structure diagram of every group of trend compensator of the series connection side apparatus of Distributed Power Flow controller of the present invention;
Fig. 4 is the structure diagram that trend compensator of the present invention is installed in babinet;
In figure, 1. head end Y- △ transformers;2. transmission line of electricity;3. single-turn transformer;4. end Y- △ transformers;5. trend Compensator;6. single-phase converter;7. DC capacitor;8. 3-phase power converter;9. the first single-turn transformer;10. the second single turn transformation Device;11. current transformer;12. controller;13. current transformer;14. voltage transformer;15. first division conducting wire;16. second point Split conducting wire;17. strain rod tower;18. integration module;19. communication module.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, with Exemplified by 2 split conductors, the present invention will be described in further detail.
With reference to shown in Fig. 1~Fig. 4, Distributed Power Flow controller of the present invention, on transmission line of electricity 2, transmission of electricity Circuit is provided at both ends with head end Y- △ transformers 1 and end Y- △ transformers 4, which includes side apparatus and series side in parallel Equipment, side apparatus in parallel include the 3-phase power converter 8, the single-phase converter 6 that set back-to-back, the DC side of 3-phase power converter 8 and DC capacitor 7 is parallel between the DC side of single-phase converter 6, the exchange side of 3-phase power converter 8 passes through head end Y- △ transformers 1 △ side joints enter transmission line of electricity 2, the neutral point access for the Y sides that the exchange side of single-phase converter 6 passes through head end Y- △ transformers 1 is defeated Electric line 2;
Two are split into per phase transmission line of electricity 2, is respectively first division conducting wire 15, the second split conductor 16;Series side is set Standby to include multigroup trend compensator 5 being connected on every phase transmission line of electricity 2, every group of trend compensator 5 includes current transformer 11, first Single-turn 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 the second single-turn transformer 10 per certain group trend compensator 5 on phase transmission line of electricity 2 share a set of change Flow device 11, controller 12, current transformer 13, voltage transformer 14 and communication module 19, the exchange side of current transformer 11 passes through the One single-turn transformer 9 and the second single-turn transformer 10 are respectively connected to first division conducting wire 15, the second split conductor 16, Current Mutual Inductance Device 13 and voltage transformer 14 are arranged on first division conducting wire 15, current transformer 13 and voltage transformer 14 and controller 12 Input terminal connection, the output terminal of controller 12 is connected with the DC side of transformer 11, communication module 19 and meanwhile with controller 12 Input terminal and voltage transformer 14 connect.
Current transformer 11 is made of switching tube and diode, and switching tube has four, forms single-phase full bridge circuit;Each switching tube Upper one diode of inverse parallel, plays afterflow.
The specific mounting means of Distributed Power Flow controller of the present invention:Side apparatus in parallel is accessed to transmission of electricity system as shown in Figure 1 System, will draw two groups of equalizing signal accesses first in Fig. 4 per 11 exchange side of current transformer of the series connection side apparatus on phase transmission line of electricity 2 The secondary of the secondary of first single-turn transformer 9 of split conductor 15 and the second single-turn transformer 10 of the second split conductor 16;Will Certain group trend compensator 5 in certain phase of series connection side apparatus shown in Fig. 4 is integrated in a babinet, as shown in figure 4, in babinet First single-turn transformer 9 and the second single-turn transformer 10 use the eccentrically mounted first division for being respectively clamped into certain phase transmission line of electricity 2 Conducting wire 15, the second split conductor 16, and be connected by connecting line with controller 12 and current transformer 11;Communication module 10, controller 12 and current transformer 11 be integrated on the integration module 18 in babinet;Finally by the babinet of integrated such as Fig. 4, access is every as shown in Figure 2 In 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 block and the second iron core Block two parts, first take away the second iron core block, and controlled first division conducting wire 15, the second split conductor 16 are caught in the first iron Pellet, then the second iron core block is closed, close babinet.
The present invention is suitable for the control method of the Distributed Power Flow controller of multiple fission conductor, and transmission line of electricity 2 is erected at Head end Y- △ transformers 1 and end Y- △ transformers 4 is coordinated to form transmission system on strain rod tower 17, control method includes as follows Step:
S1, set every phase transmission line of electricity 2 and be mounted with n group trends compensator 5, and transmission system passes through the three of Fig. 1 parallel connection side apparatus Phase current transformer 8 is charged to desired value V to DC capacitor 7shdcref, while to series connection side apparatus 11 DC capacitor of 3n current transformer It is charged to desired value Vsedcref(n)
S2, detected by current transformer 13, voltage transformer 14 every phase transmission line of electricity 2 first division conducting wire 15 electricity Stream and voltage, and the electric current collected and voltage signal are sent into controller 12;
The electric current that current transformer 13 detects, is multiplied by 2 (because 15 and second split conductor of first division conducting wire at this by S3 16 voltages are equal, electric current is equal), then controlled with the signal of the voltage signal combination communication module 19 of the detection of voltage transformer 14 Power calculation is carried out in device 12:Divided by the transmission line of electricity 2 that calculates of transmission system scheduling the is obtained by communication module 19 Transmission power target value P needed for one split conductor 15, the second split conductor 16Lref、QLref, controller combination current transformer 13rd, first division conducting wire 15, the transmission power parameters of the second split conductor 16 are calculated in the signal that voltage transformer 14 gathers PL、QL, calculate Δ P=PLref-PL, Δ Q=QLref-QL
S4, the data that step S3 is calculated input current transformer 11, and triggering control, single-phase transmission of electricity are carried out to current transformer 11 On circuit 2 current transformer 11 of every group of trend compensator 5 to the active power that transmission system provides be Δ P/ (3n);
The data that step S4 current transformers 11 export, is sent respectively to the first single-turn transformer 9 and second by S5 in duplicate Single-turn transformer 10, then the first single-turn transformer 9 and the second single-turn transformer 10 provide the work(being coupled into transmission system in Fig. 4 Rate is Δ P/ (6n), Δ Q/ (6n);
The single-phase converter 6 of side apparatus in parallel current transformer 11 into Fig. 4, which provides, in S6, Fig. 1 maintains DC voltage VdcIt is constant 3 subharmonic current ish
All switching tube access circuit times in S7,11 a cycle of current transformer by switching each group trend compensator 5 Sequence, obtain the parameter value needed for step S5 and S6, it is real by varying the time value that each switching tube is opened by above-mentioned switching law The now orderly switching of each trend compensator switch, is specially for one machine infinity bus system:Consider external disturbance and inner parameter Uncertainty, cutting for each switch of trend compensator 5 of Distributed Power Flow controller is drawn using the switching PCH systems described in formula (1) Change sequence.
Some single-turn transformer damages on two split conductors, then current transformer 11 and the connection circuit of the single-turn transformer breaks Open, other components continue normally to provide required compensation power to transmission system.Assuming that some single-turn transformer damages, then the phase With the remaining single-turn transformer that is connected of group current transformer to the power that system provides be Δ P/ (6n-1), Δ Q/ (6n-1).
The present invention realizes the coordination optimization control of each compensator using optimal switching strategy, and switching law is institute in a cycle There is the sequence of switching tube access circuit time, the time value opened by varying each switching tube realizes the orderly of each compensator switch Switching.The electric system of the control device containing Distributed Power Flow has an extremely complex dynamics, the present invention for unit without Poor big system, the method that the switching sequence that each trend compensator 5 switchs is provided according to formula (1).
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (7)

1. a kind of control method of Distributed Power Flow controller, Distributed Power Flow controller is installed on transmission line of electricity, power transmission line Road is provided at both ends with head end Y- △ transformers and end Y- △ transformers, which includes side apparatus and series side in parallel and set Standby, side apparatus in parallel includes 3-phase power converter, the single-phase converter set back-to-back, the DC side of 3-phase power converter and single-phase change Flow and be parallel with side DC capacitor in parallel between the DC side of device, the △ that the exchange side of 3-phase power converter passes through head end Y- △ transformers Side joint enters transmission line of electricity, the neutral point access transmission line of electricity for the Y sides that the exchange side of single-phase converter passes through head end Y- △ transformers, Some split conductors are split into per phase transmission line of electricity, the series connection side apparatus includes multigroup be connected on every phase transmission line of electricity Trend compensator, every group of trend compensator include current transformer and several matched single-turn transformers of split conductor radical, control Device, current transformer, voltage transformer and communication module, certain group share one per some single-turn transformers on phase multiple fission conductor Set current transformer, controller, current transformer, voltage transformer and communication module, the exchange side of current transformer are become by each single turn Depressor is respectively connected to each split conductor, and current transformer and voltage transformer are disposed therein on a split conductor, electric current The input terminal of mutual inductor and voltage transformer and controller connects, and the output terminal of controller and the DC side of current transformer connect, and lead to Letter module is connected with the input terminal and voltage transformer of controller at the same time;Electric transmission line erection is coordinated to head on strain rod tower Y- △ transformers and end Y- △ transformers is held to form transmission system, it is characterised in that control method includes the following steps:
S1, set every phase transmission line of electricity and be mounted with n group trend compensators, transmission system by the 3-phase power converter of side apparatus in parallel to Side DC capacitor in parallel is charged to desired value Vshdcref, while the series side DC capacitor of the 3n current transformer to series connection side apparatus It is charged to desired value Vsedcref(n)
S2, electric current and voltage by certain the root split conductor of current transformer, voltage transformer detection per phase transmission line of electricity, and The electric current collected and voltage signal are sent into controller;
The electric current that current transformer detects is multiplied by m, then the electricity with voltage transformer detection by S3, the radical for setting split conductor as m The signal of pressure signal node hop communication module carries out power calculation in the controller;
S4, the data that step S3 is calculated input current transformer, and triggering control is carried out to current transformer;
S5, by step S4 current transformers export m parts of one formula of data be sent respectively to each single-turn transformer;
S6, the single-phase converter of side apparatus in parallel provide to current transformer and maintain DC voltage Vdc3 constant subharmonic current ish
The sequence of all switching tube access circuit times in S7, the current transformer a cycle by switching each group trend compensator, Obtain the parameter value needed for step S5 and S6.
2. the control method of Distributed Power Flow controller according to claim 1, it is characterised in that step S3 is specially: Transmission work(needed for each split conductor divided as the transmission line of electricity that transmission system scheduling calculates is obtained by communication module Rate desired value PLref、QLref, controller combination current transformer, the signal of voltage transformer collection are calculated the division of certain root and lead The transmission power parameters P of lineL、QL, calculate Δ P=PLref-PL, Δ Q=QLref-QL;It is every in single-phase power transmission line then in step S4 Group trend compensator current transformer to the active power that transmission system provides be Δ P/ (3n);In step S5, each single turn transformation It is Δ P/ (3mn), Δ Q/ (3mn) that device, which provides the power being coupled into transmission system,.
3. the control method of Distributed Power Flow controller according to claim 1, it is characterised in that step S7 by varying The time value that each switching tube is opened realizes the orderly switching of each trend compensator switch, is specially for one machine infinity bus system: Consider that external disturbance and inner parameter are uncertain, show that the current transformer of each trend compensator is opened using following formula switching PCH systems The switching sequence of pass:
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In formula, x is generator amature angle, and rotor velocity, generator potential, the series connection of Distributed Power Flow controller is lateral to transmit electricity The fundamental voltage amplitude of system injection and phase angle, the fundamental current active component of lateral transmission system injection in parallel and idle point Amount, influences the fundamental wave and 3 subharmonic active power current status variable vectors of connection in series-parallel current transformer DC capacitor voltage;P is defeated The unknown vector of electric system parameter perturbation;ω is external disturbance;Z is to penalize signal;hλ(t)(x) it is weight matrix;Jλ(t)(x, p) serves as reasons The system structure parameter for Distributed Power Flow controller and the one machine infinity bus system composition that toggle path determines;Rλ(t)(x, p) is The system consumption parameter determined by toggle path;Hλ(t)(x) it is the corresponding each converter system Hamilton functions in effect section;Map λ (t):[t0,+∞) and → Λ={ 1,2 ..., N } be a segmentation right continuous function, for switching Path;x0For the system transient modelling equalization point;U is feedback rate control.
4. the control method of Distributed Power Flow controller according to claim 1, it is characterised in that work as multiconductor bundles Upper some single-turn transformer damage, then disconnect the connection circuit of current transformer and the single-turn transformer, and other components continue normal Compensation power needed for being provided to transmission system.
5. the control method of Distributed Power Flow controller according to claim 1, it is characterised in that when some single turn transformation Device damages, then the power that the remaining single-turn transformer that the identical group of current transformer is connected is provided to system be Δ P/ (3mn-1), ΔQ/(3mn-1)。
6. the control method of Distributed Power Flow controller according to claim 1, it is characterised in that the current transformer is by opening Close pipe with diode form, the switching tube by four, form single-phase full bridge circuit;One two pole of inverse parallel on each switching tube Pipe.
7. the control method of Distributed Power Flow controller according to claim 1, it is characterised in that the series connection side apparatus Certain phase on certain group trend compensator be integrated in a babinet, each single-turn transformer uses eccentrically mounted difference in babinet Each split conductor of certain phase transmission line of electricity is caught in, and is connected by connecting line with controller and current transformer;Communication module, control Device and current transformer are integrated on the integration module in babinet.
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