CN104319905B - A kind of rapidly self-healing system of distribution network - Google Patents

A kind of rapidly self-healing system of distribution network Download PDF

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Publication number
CN104319905B
CN104319905B CN201410666049.0A CN201410666049A CN104319905B CN 104319905 B CN104319905 B CN 104319905B CN 201410666049 A CN201410666049 A CN 201410666049A CN 104319905 B CN104319905 B CN 104319905B
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China
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data transmission
transmission unit
current
data
offside
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CN104319905A (en
Inventor
张太勤
张川
谢兵
詹宏
何峻
王蕾
肖丹
唐启军
谭真
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URBAN POWER SUPPLY BRANCH OF STATE GRID CHONGQING ELECTRIC POWER Co
XINSHIJI ELECTRICAL CO Ltd CHONGQING
State Grid Corp of China SGCC
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URBAN POWER SUPPLY BRANCH OF STATE GRID CHONGQING ELECTRIC POWER Co
XINSHIJI ELECTRICAL CO Ltd CHONGQING
State Grid Corp of China SGCC
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/7838
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

Abstract

This application provides a kind of rapidly self-healing system of distribution network, the rapidly self-healing system includes being separately positioned on the data transmission unit DTU of each distribution substation in distribution network, then all data transmission unit DTU are linked together using light network, data transmission unit DTU is used for progress to four branch roads of association interval sampling on schedule, then the current data collected is synchronized, judge trouble point further according to the current data after synchronization, and control the opening and closing device of distribution substation that the trouble point is cut off or isolated.Because this rapidly self-healing system need not rely on main station system, the problem of so as to be not in information gathering and channel block, therefore it is capable of the trouble point of fast positioning excision distribution network.

Description

A kind of rapidly self-healing system of distribution network
Technical field
The application is related to technical field of electric power, more specifically to a kind of rapidly self-healing system of distribution network.
Background technology
In recent years, with the construction of national intelligent power network, to power supply quality and the requirement more and more higher of reliability, and mesh Preceding urban distribution network circuit is generally less than 1~10kM, and circuit is shorter, and during line failure, the fault current of each segmentation approaches Identical, traditional stage overcurrent protection is difficult to distinguish on current ration, is difficult to coordinate on the time limit.And existing power distribution network Monitoring and controlling relies on main station system with data collecting system (SCADA) due to needing, also can existence information collection and channel block The problem of, so as to easily cause tripping operation of bypassing the immediate leadership with isolated fault and recover the extension of fault time, this, which just needs one kind badly, to make The protection system of distribution network rapidly self-healing, to enable distribution network fast positioning, excision trouble point.
The content of the invention
In view of this, the application provides a kind of rapidly self-healing system of distribution network, and power distribution network is cut off for fast positioning The trouble point of network.
To achieve these goals, it is proposed that scheme it is as follows:
A kind of rapidly self-healing system of distribution network, including multiple data transmission units and fiber optic network, wherein:
The fiber optic network is used to link together the multiple data transmission unit, and the fiber optic network is gone here and there to be synchronous Mouth E1 dedicated fibre optical networks;
The multiple data transmission unit is separately positioned in multiple distribution substations of the distribution network, for according to each Clock is spaced on schedule to be sampled to the current synchronization of 4 branch roads, and latter two right described data transmission unit is mended by vector The current data for repaying 4 branch roads of the technology to collecting synchronizes, and judges trouble point according to the current data after synchronization, And controlling the opening and closing device of the distribution substation to be cut off the trouble point, the data transmission unit includes 4 differential guarantors Logic element and 4 current transformers are protected, 4 differential protection logic elements are used to respectively realize the electric current of 4 branch roads By phase differential protection, 4 differential protection logic units are utilized respectively electric current of 1 current transformer to 1 branch road Sampled;
The data transmission unit is protected using vertical connection split-phase type current differential protection principle to the distribution network;
Described two data transmission units are entered by the current data of 4 branch roads of the vector compensation technology to collecting Row synchronously includes:
It is x to make data transmission unit described in this side receive the electric current phasor real part of data transmission unit described in offside, imaginary part For y, the corresponding θ angle of sampling delay error delta T, θ=2 π f △ T, f are current electric grid frequency, sampling delay error delta T=T3- TR-T4=0.5* (T3+T0+Tm)-T4, wherein, data transmission unit described in this side sends message, number described in offside at the T0 moment Receive the message at the T1 moment according to transmission unit, when next timing delivery time T2, calculate Tm=T2-T1, and by when Between information T2, Tm, T0 be sent to data transmission unit described in this side, data transmission unit receives report at the T3 moment described in this side Text, it is that data transmission unit described in this side receives data transfer described in offside to calculate communication channel delay TR=(T3-T0-Tm)/2, T4 Before unit sampling error correction starts message, at the time of the last transmission message;
△T>When 0, data transmission unit sampling lag described in offside one △ T, data transmission unit described in offside are adopted Sample phasor, which should carry out positive θ angle compensations, to carry out differential calculating, this side with the sampled data of data transmission unit described in this side The compensation formula of the data transmission unit is:X '=xcos θ-ysin θ y '=ycos θ+xsin θ;Data transfer described in this side Unit sampling phasor, which should carry out negative θ angle compensations, to carry out differential meter with the sampled data of data transmission unit described in offside Calculate, the compensation formula of data transmission unit is described in offside:X '=xcos θ+ysin θ y '=ycos θ-xsin θ;
△T<When 0, data transmission unit sampling advanced a △ T, data transmission unit described in offside are adopted described in offside Sample phasor, which should carry out negative θ angle compensations, to carry out differential calculating, this side with the sampled data of data transmission unit described in this side The compensation formula of the data transmission unit is:X '=xcos θ+ysin θ y '=ycos θ-xsin θ;Data transfer described in this side Unit sampling phasor, which should carry out positive θ angle compensations, to carry out differential meter with the sampled data of data transmission unit described in offside Calculate, the compensation formula of data transmission unit side is described in offside:X '=xcos θ-ysin θ y '=ycos θ+xsin θ.
Preferably, the distribution network is 1~10kV distribution networks.
Preferably, the data illustrate unit using the Sudden Changing Rate of split-phase type difference current and the Sudden Changing Rate of stalling current Time difference discrimination principles, the CT saturation status monitoring and blocking function are realized, to prevent that it is described that external area error from causing There is false protection in distribution substation.
Preferably, the data transmission unit judges whether the branch road is weak feedback side by monitoring positive sequence voltage change.
Preferably, after it is weak feedback side to judge the branch road, the mains side of the data transmission unit is changed into.
It can be seen from the above technical proposal that this application provides a kind of rapidly self-healing system of distribution network, this is fast Fast self-healing system includes the data transmission unit DTU for being separately positioned on each distribution substation in distribution network, then utilizes reticule Network links together all data transmission unit DTU, and data transmission unit DTU, which is used to each be spaced on schedule, to be pressed Sampling is synchronized to four branch roads, then the current data collected synchronized, further according to the electric current number after synchronization According to judgement trouble point, and control the opening and closing device of distribution substation that the trouble point is cut off or isolated.Due to this rapidly self-healing system System need not rely on main station system, the problem of so as to be not in information gathering and channel block, therefore being capable of fast positioning excision The trouble point of distribution network.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of application, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structure chart of the rapidly self-healing system for distribution network that the embodiment of the present application provides;
Fig. 2 is a kind of active region schematic diagram for vertical split-phase type difference current that the application provides;+
Fig. 3 is the vertical connection split-phase type difference current logic chart of one kind that the application provides;
Fig. 4 is the vertical connection split-phase type difference current integral system figure of one kind that the application provides;
Fig. 5 is that a kind of weak feedback that the application provides starts logic schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete Site preparation describes, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on Embodiment in the application, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of the application protection.
Fig. 1 is a kind of structure chart of the rapidly self-healing system for distribution network that the embodiment of the present application provides.
As shown in figure 1, the rapidly self-healing system for the distribution network that the present embodiment provides includes multiple data transmission unit DTU With fiber optic network 100, this rapidly self-healing system is applied to 1~10kV distribution networks.
Data transmission unit DTU is arranged in the distribution substation of distribution network, and fiber optic network 100 is by the plurality of data transfer list First DTU links together.The preferred synchronous biography mouth E1 fiber optic networks of fiber optic network 100.
Data transmission unit DTU is used to be spaced the electricity to 4 branch roads of distribution substation on schedule according to respective clock Stream is sampled.Then the current data of 4 branch roads synchronizes before and after being realized by vector compensation technology, after synchronization Current data judges trouble point, then controls the opening and closing device of distribution substation that the trouble point is isolated or cut off.
It can be seen from the above technical proposal that a kind of rapidly self-healing system of distribution network is present embodiments provided, should Rapidly self-healing system includes being separately positioned on the data transmission unit DTU of each distribution substation in distribution network, then utilizes light Network links together all data transmission unit DTU, and data transmission unit DTU is used to each be spaced on schedule Sampling is synchronized by four branch roads, then the current data collected is synchronized, further according to the electric current after synchronization Data judging trouble point, and control the opening and closing device of distribution substation that the trouble point is cut off or isolated.Due to this rapidly self-healing System need not rely on main station system, the problem of so as to be not in information gathering and channel block, therefore can fast positioning cut Except the trouble point of distribution network.
The application is multiplexed with the Cable Core that power distribution automation is laid using the principle of vertical connection split-phase type current differential protection Line, passage cost is not increased, to reach the purpose of complete fibre.And vertical connection split-phase type current differential protection uses and is based on failure phase The data synchronization technology of amount, when this side, which calculates sampling delay error, is more than 0.05ms (0.9 ° of electrical angle), using this moment as Benchmark, time tag is stamped, calculate fault current phasor, then utilize the synchronous serial communication technology based on optical fiber to be passed to opposite end The defeated phasor, judge whether to belong to troubles inside the sample space by vertical connection split-phase type current differential protection, so as to produce related protection act Behavior.Synchronous serial passage carries channel data synchronous task in itself, analog quantity sampled data conveyer belt reference time label, just The change of channel delay conveniently can be calculated and monitor, and the change to communication channel delay carries out real-time vector compensation.
Meanwhile the application also uses the time difference discrimination principles of split-phase type difference current Sudden Changing Rate and stalling current Sudden Changing Rate, Prevent distribution line external area error from causing transformer saturation and making the situation of differential protection malfunction, changed by monitoring positive sequence voltage Judge weak feedback side fault initiating, whether adaptive determination apparatus is in weak feedback side, can effectively protect light current source and non-transformer side Device.
Indulging connection split-phase type current differential protection is:Under the conditions of proper communication and receive the differential permission signal of offside, this side Difference of phase currents or this side line road are in one of weak feedback state and meet condition, though break in this side without TA or there are TA broken strings to match somebody with somebody In the case of the condition satisfaction for putting not Blocking Differential Protection, under the conditions of vertical connection split-phase type current differential protection configuration input, In any one differential current computing cycle, if difference current and stalling current meet following relations:
(1)Icd>Iczd
(2)Iz≤Izzd1
Or Izzd1<Iz≤Izzd2 Icd>Iczd+Kz1(Iz-Izzd1)
Or Iz>Izzd2 Icd≥Iczd+Kz1(Izzd2-Izzd1)+Kz2(Iz-Izzd2)
Wherein IcdFor difference current, IzFor stalling current, Kz1For the ratio brake coefficients of MN sections shown in Fig. 2, Kz2For NQ sections ratio Rate restraint coefficient.
At this moment, vertical phase-comparison protection element active flag is transmitted to offside immediately, continuous three differential current computing cycles are full Sufficient operation condition, vertical connection phase-comparison protection action command and " vertical connection phase-comparison protection action " SOE information are sent immediately.
Such as Fig. 4, in the DTU of distribution substation 2,4 differences of former and later two direction branch roads 201,202,203 and 204 are integrated with Dynamic relay protective scheme element, the differential protection function of 4 branch roads and the synchronous acquisition of electric current are realized, is intercoursed between adjacent DTU Information, the synchronous data sampling of former and later two distribution substations and this distribution substation totally 8 current signals, logic function integrated level can be achieved It is high.Wherein QF11, QF12, QF13, QF14, QF21, QF22, QF23, QF24, QF31, QF32, QF33, QF34 are Fig. 1 institutes timberline The breaker on road, CT11, CT12, CT13, CT14, CT21, CT22, CT23, CT24, CT31, CT32, CT33, CT34 are respectively The current transformer being connected with each breaker.
The present invention realizes vertical connection split-phase type current differential protection, the data syn-chronization side of use using DTU between feeder line two-by-two Method is carried out between two-by-two, and the communication channel delay of same physical channel is identical in DTU, compensation of delay algorithm and parameter also phase Together, can be delayed monitoring element with common-use tunnel, and a DTU share data syn-chronization algorithm as 2 pairs, for convenience of description, only with Exemplified by one of branch road, illustrate the method for data synchronization principle of the vector compensation of communication channel delay.
DTU both ends carry out each phase current by respective sample frequency (being spaced on schedule) and sampled simultaneously, sampling every time After the completion of all to each electric current carry out fundamental wave Fourier transformation, obtain what is represented correspondingly with real and imaginary parts with sampled point Electric current phasor.Under normal condition, this DTU constantly calculate receive information and send information time difference Tm=T2-T1, using it as The information that the parameter of sampling delay monitoring is sent with next time sends jointly to the DTU of offside, and DTU is by current Tm and previous correction The Tm0 remembered during error compares, if the absolute value of both differences is more than 0.05ms (0.9 ° of electrical angle), starts sampling immediately Error calculation order, send sampling error and calculate startup message.
This side DTU sends message at the T0 moment, and offside DTU receives the message at the T1 moment, when next timing is sent Moment T2, calculates Tm=T2-T1, and by T2, Tm, T0 temporal informations are sent to this DTU, and this side DTU receives message at the T3 moment, Thus obtain under the conditions of designated lane, fixed route based on this DTU clock times T0, T3 and based on offside DTU clocks T2 and time difference Tm communication channel delay:TR=TS=(T3-T0-Tm)/2, sampling delay error are:△ T=T3-TR-T4 =0.5* (T3+T0+Tm)-T4, T4 are the last hair before this side DTU receives offside DTU sampling errors correction startup message Deliver newspaper text at the time of.△T>0 explanation offside DTU lags behind this DTU samplings, △ T<0 explanation offside DTU is ahead of this DTU samplings.
This DTU is preserved after calculating sampling delay error and is transmitted to offside DTU immediately, while during by itself analog quantity It is initial number 1 to mark numbering involution, after offside DTU receives the sampling delay error time that this DTU is sent, represents that sampling delay misses Difference, which calculates, to be terminated, and is also initial number 1 by the involution of analog quantity markers, the electric current phasor with identical numbering is compared in both sides Compared with, and θ angles carry out vector compensation corresponding to △ T.
It is x to make this DTU receive offside DTU electric current phasor real part, imaginary part y, the corresponding θ angle of sampling delay error, θ =2 π f △ T, f are current electric grid frequency.
△T>When 0, offside DTU sampling lags one △ T, offside DTU sampled phasors should carry out positive θ angle compensations ability Differential calculating is carried out with this DTU sampled data, this DTU compensation formula is:X '=xcos θ-ysin θ y '=ycos θ+ xsinθ;This DTU sampled phasors, which should carry out negative θ angle compensations, to carry out differential calculating, offside with offside DTU sampled data DTU compensation formula is:X '=xcos θ+ysin θ y '=ycos θ-xsin θ.
△T<When 0, offside DTU samplings advanced a △ T, offside DTU sampled phasors should carry out negative θ angle compensations ability Differential calculating is carried out with this DTU sampled data, this DTU compensation formula is:X '=xcos θ+ysin θ y '=ycos θ- xsinθ;This DTU sampled phasors, which should carry out positive θ angle compensations, to carry out differential calculating, offside with offside DTU sampled data The compensation formula of DTU sides is:X '=xcos θ-ysin θ y '=ycos θ+xsin θ.
The application is using the time difference discrimination principles of split-phase type difference current Sudden Changing Rate and stalling current Sudden Changing Rate, monitoring current Transformer saturation state, when generation distribution line external area error causes transformer saturation, protection blocking, prevent differential protection from missing It is dynamic.
Meet entry condition (current-difference sudden-change component startup) in protection, if difference current power frequency variation criterion is stagnant Stalling current power frequency variation criterion is more than 8 sampling intervals (i.e. 1/4 power frequency period, by the collection of every power frequency period afterwards 32 points), that is, TA saturations are thought, immediately 160 sampling interval durations of the phase-comparison protection of locking both sides (5 cycles), as both sides are each Opening is poor again with the ratio between triple-frequency harmonics sum and the phase fundamental current respectively less than setting valve (acquiescence 15%) for phase current second harmonic Dynamic protection, otherwise differential protection locking always is until the return of ratio differential condition.
Difference current using k-th of sampled point as data window terminal calculates:
Respectively using k-th of sampled point as certain phase current phase after Fourier's calculating of data window terminal Amount.
Difference current using kth-N number of sampled point as data window terminal calculates:
Difference current using -2N sampled points of kth as data window terminal calculates:
Difference current power frequency variation:
Difference current power frequency variation saturation criterion:ΔIcdφ(k)≥1.25ΔIcdN+IQD
IQDTypically adjusted by 0.2 times of secondary rated current.
Stalling current using k-th of sampled point as data window terminal calculates:
Respectively using k-th of sampled point as certain phase current phase after Fourier's calculating of data window terminal Amount.
Stalling current using kth-N number of sampled point as data window terminal calculates:
Stalling current using -2N sampled points of kth as data window terminal calculates:
Stalling current power frequency variation:
Stalling current power frequency variation saturation criterion:ΔIzdφ(k)≥1.25ΔIzdN+IQD
IQDTypically adjusted by 0.2 times of secondary rated current.
The application judges weak feedback side fault initiating principle by monitoring positive sequence voltage change, and whether adaptive determination apparatus is located In weak feedback side.As shown in figure 5, difference of phase currents, excessively stream are not actuated, if bus positive sequence voltage is by normal value (positive sequence phase Voltage is more than 50V) be changed into positive sequence phase voltage and be less than 30V, or bus positive sequence line voltage by normal value (positive sequence line voltage is more than 90V) It is changed into positive sequence line voltage and is less than 50V, meet the above-mentioned condition twice in succession, just put weak feedback active flag, protection is unsatisfactory for acting Condition 200ms is returned, and protection meets that operation condition, trip signal return after sending.The present invention can effectively meet that distribution line is each The running environment that the side method of operation changes often, if the method for operation changes (such as this side is changed to mains side operation), not manually Definite value is changed, weak feedback entry condition automatically exits from effectively meeting condition.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other The difference of embodiment, between each embodiment identical similar portion mutually referring to.To the upper of the disclosed embodiments State bright, professional and technical personnel in the field is realized or using the application.A variety of modifications to these embodiments are to ability It will be apparent for the professional and technical personnel in domain, generic principles defined herein can not depart from the application's In the case of spirit or scope, realize in other embodiments.Therefore, the application be not intended to be limited to it is shown in this article these Embodiment, and it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.

Claims (5)

  1. A kind of 1. rapidly self-healing system of distribution network, it is characterised in that including multiple data transmission units and fiber optic network, its In:
    The fiber optic network is used to link together the multiple data transmission unit, and the fiber optic network is synchronous serial interface E1 Dedicated fibre optical network;
    The multiple data transmission unit is separately positioned in multiple distribution substations of the distribution network, for according to respective clock It is spaced on schedule and the current synchronization of 4 branch roads is sampled, latter two right described data transmission unit passes through vector compensation skill The current data of 4 branch roads of the art to collecting synchronizes, and judges trouble point according to the current data after synchronization, and control The opening and closing device for making the distribution substation is cut off the trouble point, and the data transmission unit is patrolled including 4 differential protections Element and 4 current transformers are collected, phase is pressed in the electric current realization that 4 differential protection logic elements are used for respectively to 4 branch roads Differential protection, 4 differential protection logic units are utilized respectively 1 current transformer and the electric current of 1 branch road are carried out Sampling;
    The data transmission unit is protected using vertical connection split-phase type current differential protection principle to the distribution network;
    Described two data transmission units are carried out same by the current data of 4 branch roads of the vector compensation technology to collecting Step includes:
    It is x, imaginary part y to make data transmission unit described in this side receive the electric current phasor real part of data transmission unit described in offside, The corresponding θ angle of sampling delay error delta T, θ=2 π f △ T, f are current electric grid frequency, sampling delay error delta T=T3-TR- T4=0.5* (T3+T0+Tm)-T4, wherein, data transmission unit described in this side sends message, data described in offside at the T0 moment Transmission unit receives the message at the T1 moment, when next timing delivery time T2, calculates Tm=T2-T1, and by the time Information T2, Tm, T0 are sent to data transmission unit described in this side, and data transmission unit receives message at the T3 moment described in this side, It is that data transmission unit described in this side receives data transmission unit described in offside to calculate communication channel delay TR=(T3-T0-Tm)/2, T4 Before sampling error correction starts message, at the time of the last transmission message;
    △T>When 0, one △ T of data transmission unit sampling lag described in offside, data transmission unit described in offside samples phase Amount should carry out positive θ angle compensations could carry out differential calculating with the sampled data of data transmission unit described in this side, described in this side The compensation formula of data transmission unit is:X '=xcos θ-ysin θ y '=ycos θ+xsin θ;Data transmission unit described in this side Sampled phasor, which should carry out negative θ angle compensations, to carry out differential calculating with the sampled data of data transmission unit described in offside, right The compensation formula of data transmission unit described in side is:X '=xcos θ+ysin θ y '=ycos θ-xsin θ;
    △T<When 0, the advanced △ T of data transmission unit sampling, data transmission unit described in offside sample phase described in offside Amount should carry out negative θ angle compensations could carry out differential calculating with the sampled data of data transmission unit described in this side, described in this side The compensation formula of data transmission unit is:X '=xcos θ+ysin θ y '=ycos θ-xsin θ;Data transmission unit described in this side Sampled phasor, which should carry out positive θ angle compensations, to carry out differential calculating with the sampled data of data transmission unit described in offside, right The compensation formula of data transmission unit side is described in side:X '=xcos θ-ysin θ y '=ycos θ+xsin θ.
  2. 2. rapidly self-healing system as claimed in claim 1, it is characterised in that the distribution network is 1~10kV distribution networks.
  3. 3. the rapidly self-healing system as described in any one of claim 1~2, it is characterised in that the data transmission unit uses The time difference discrimination principles of the Sudden Changing Rate of split-phase type difference current and the Sudden Changing Rate of stalling current, realize the CT saturation Status monitoring and blocking function, to prevent external area error from causing the distribution substation false protection occur.
  4. 4. rapidly self-healing system as claimed in claim 3, it is characterised in that the data transmission unit is by monitoring positive sequence electricity Bucklingization judges whether the branch road is weak feedback side.
  5. 5. rapidly self-healing system as claimed in claim 4, it is characterised in that after it is weak feedback side to judge the branch road, by it Change into the mains side of the data transmission unit.
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