CN109066614A - A kind of half-wave power transmission line protection method based on transient state energy - Google Patents

A kind of half-wave power transmission line protection method based on transient state energy Download PDF

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Publication number
CN109066614A
CN109066614A CN201811029179.8A CN201811029179A CN109066614A CN 109066614 A CN109066614 A CN 109066614A CN 201811029179 A CN201811029179 A CN 201811029179A CN 109066614 A CN109066614 A CN 109066614A
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China
Prior art keywords
transient state
route
energy
state energy
fault
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CN109066614B (en
Inventor
束洪春
琚夏阳
韩鸣
韩一鸣
达惠
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The present invention relates to a kind of half-wave power transmission line protection method based on transient state energy belongs to Relay Protection Technology in Power System field.When detecting failure; voltage, jump-value of current are calculated by the transient state electrical quantity that head and end detects; instantaneous power is calculated by the product of transient voltage, jump-value of current; and transient state energy is sought by the integral of instantaneous power; with its tectonic province internal and external fault criterion of the polarity of transient state energy; no matter fault point, which is located at route where this method, can reliably realize that area's internal and external fault recognizes; furthermore transient state energy polarity is not changed by fault angle, transition resistance and changes polarity, therefore transient state energy Protection Code is suitable for half-wave power transmission route.

Description

A kind of half-wave power transmission line protection method based on transient state energy
Technical field
The present invention relates to a kind of half-wave power transmission line protection method based on transient state energy belongs to electric system relay guarantor Protect technical field.
Background technique
Half-wavelength ac transmission refers to transmission distance close to the overlength distance UHV AC transmission technique of half of power frequency wavelength, in work When frequency 50HZ, transmission distance is about 3000km, and half-wave power transmission technology is to be proposed by Soviet Union scholar in the 1940s, by In not having Practical Project demand at that time, and its key technology is not broken through, though half-wave power transmission technology can be used for Energy Base and negative Remote between lotus center, extensive, large capacity power Transmission problem, but half-wave power transmission network there is no to put into so far Operation.As large capacity, telecommunicate power transmission mode, advantage is half-wavelength UHV AC transmission technique: 1. completely idle from flat Weighing apparatus, without installing reactive-load compensation equipment；2. voltage stability is good, all fronts steady-state pressure 1p.u；3. from the angle of power transmission and Speech, equivalent electrical distance are 0, and theoretically ability to transmit electricity is infinitely great；4. economic performance is excellent, compared to UHVDC, half-wavelength is handed over The natural characteristic that technology of transmission of electricity utilizes pure AC system is flowed, additional operation control device is not necessarily to.Currently, half-wavelength field dependency basis The strategic development planning of China national grid company has been included in plinth subject study, and is received significant attention.
The voltage and current feature of route and common line are entirely different when half wavelength line failure, and distribution capacity is big, It is easy to be influenced by distribution capacity, so traditional protection philosophy is not suitable for half wavelength line.For distance protection, half-wavelength Route survey impedance is with position of failure point nonlinear change, and the space length and electrical distance of route are no longer in a linear relationship, nothing Method distinguishes route head end and positive outlet failure, and there are serious forward directions to surmount, and distance protection is no longer applicable in.Existing literature proposes A kind of half wavelength line is with impedance protection.The electrical quantity of Sustainable use route two sides protection installation place derives fault point Offset voltage and electric current are constructed using offset voltage and electric current with impedance.This method has used the electrical quantity of route two sides, needs Rely on channel.Another existing literature proposes a kind of improved distance protecting method, has reconfigured voltage and current component, measurement Impedance is hyperbolic real-number function, is monotonically changed within the scope of half-wave power transmission.But the distance protection is only applicable to phase-to phase fault.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of half-wave power transmission line protection method based on transient state energy, To solve the above problems.
The technical scheme is that a kind of half-wave power transmission line protection method based on transient state energy, is detecting When failure, voltage jump amount, jump-value of current are calculated by the transient state electrical quantity that head end detects, pass through transient voltage, electric current The product of Sudden Changing Rate calculates instantaneous power, and seeks transient state energy, it is specified that electric current positive direction is mother by the integral of instantaneous power Tectonic province internal and external fault criterion is carried out when the side M positive direction failure with the polarity of transient state energy, to area in the direction that line is directed toward route Internal and external fault is differentiated.
Specific steps are as follows:
(1) pass through detection voltage failure componentWith line current fault componentIt detects transmission line of electricity and event occurs Barrier,For the number of transmission line of electricity three-phase；
(2) line voltage distribution fault component after transmission line malfunction occurs is extractedWith line current fault component For the number of transmission line of electricity three-phase；
(3) fault component system power P (t) is calculated:
P (t)=Δ ua×Δia+Δub×Δib+Δuc×Δic
A, b, c are the number of transmission line of electricity three-phase；
(4) transient state energy can be obtained in certain period of time upper integral or summation in power:
T indicates a certain moment after failure in formula, and 0 indicates fault moment；
(5) rated current positive direction is the direction that bus is directed toward route, when breaking down for MN sections of route, at this time:
EM(t)=- EPM(t)
EN(t)=- EPN(t)
EPM(t)、EPNIt (t) is respectively system PM、PNThe energy of consumption and storage, when existing simultaneously inductance and capacitor in system When, there are the exchange of energy, E between inductance and capacitorPM(t)、EPN(t) any moment after a failure will all store centainly Energy, i.e. EPM(t)、EPN(t) it is consistently greater than zero.Therefore have:
EM(t) 0 <
EN(t) 0 <
(6) when breaking down for PM sections of route, have at this time:
EM(t)=EX(t)+EPN(t)
EN(t)=- EPN(t)
Wherein EX(t)、EPNIt (t) is respectively route and system PXThe energy absorbed.Due to system PNAnd the passive net such as route Network can only absorb energy, therefore EX(t)、EPN(t) it is not less than zero.Have at this time:
EM(t)≥0
EN(t) 0 <
(7) when breaking down for NQ sections of route, have at this time:
EM(t)=- EPM(t)
EN(t)=EX(t)+EPM(t)
Wherein EX(t)、EPMIt (t) is respectively route and system PMThe energy absorbed.Due to system PMAnd the passive net such as route Network can only absorb energy, therefore EX(t)、EPM(t) it is not less than zero.Have at this time:
EM(t) 0 <
EN(t)≥0
(8) accordingly, criterion is proposed:
The beneficial effects of the present invention are:
1, as fault distance increases, the transient state energy absolute value of troubles inside the sample space can be gradually reduced, but this method is in end Reliable cog region internal and external fault is remained to when failure；
2, with the increase of transition resistance, transient state energy absolute value is gradually reduced, but this method is due to using directional element It is substantially that area's internal and external fault is judged by the positive-negative polarity of transient state energy, it is not high to the size requirements of transient state energy value, and That a situation arises is few for high resistive fault in UHV transmission network, therefore need to only consider to escape setting valve and determine polarity, On the other hand, due to the integral that transient state energy is instantaneous power, when selected in window, the size of energy must be able to satisfy polarity Judge necessary requirement；
3, since transient state energy directional element is not relying on initial wavefront polarity, even if in fault initial angle very little When, the directionality of transient state energy is still obvious, and the directional element sensitivity thus constituted remains unchanged very high.
Detailed description of the invention
Fig. 1 is half-wave power transmission circuit emulation system model of the embodiment of the present invention；
Fig. 2 is extra-high voltage half-wave power transmission overhead line structures model of the present invention；
Fig. 3 is positive and negative direction failure additivity analogue system figure of the present invention；
Fig. 4 is the side M of the present invention instantaneous power and transient state energy waveform diagram；
Fig. 5 is present invention both-end transient state energy waveform diagram when route difference section breaks down；
Fig. 6 is change curve of the transient state energy of the present invention with fault distance；
Fig. 7 is change curve of the transient state energy of the present invention with fault resistance；
Fig. 8 is change curve of the transient state energy of the present invention with fault initial angle；
Fig. 9 is step flow chart of the invention.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
A kind of half-wave power transmission line protection method based on transient state energy passes through head and end when detecting failure The transient state electrical quantity detected calculates voltage jump amount Δ u (t), jump-value of current Δ i (t), passes through transient voltage, current break The product of amount calculates instantaneous power P (t), and seeks transient state energy E (t), it is specified that electric current positive direction by the integral of instantaneous power The direction of route is directed toward for bus, head end bus M side transient state energy is EM, the end side bus N transient state energy is EN, with first and last two Its tectonic province internal and external fault criterion of the polarity of transient state energy is held, if EM< 0 and ENMN segment fault in the area < 0, Ze Wei；If EM≥0 And EN< 0 is then system PMPM segment fault outside the side end P to the area at the end bus M；If EM< 0 and EN>=0, then it is bus N-terminal to being Unite PNNQ segment fault outside the area at the side end Q.
Specific steps are as follows:
(1) pass through detection voltage failure componentWith line current fault componentIt detects transmission line of electricity and event occurs Barrier,For the number of transmission line of electricity three-phase；
(2) line voltage distribution fault component after transmission line malfunction occurs is extractedWith line current fault component For the number of transmission line of electricity three-phase；
(3) fault component system power P (t) is calculated:
P (t)=Δ ua×Δia+Δub×Δib+Δuc×Δic
A, b, c are the number of transmission line of electricity three-phase；
(4) transient state energy can be obtained in certain period of time upper integral or summation in power:
T indicates a certain moment after failure in formula, and 0 indicates fault moment；
(5) rated current positive direction is the direction that bus is directed toward route, when breaking down for MN sections of route, at this time:
EM(t)=- EPM(t)
EN(t)=- EPN(t)
EPM(t)、EPNIt (t) is respectively system PM、PNThe energy of consumption and storage, when existing simultaneously inductance and capacitor in system When, there are the exchange of energy, E between inductance and capacitorPM(t)、EPN(t) any moment after a failure will all store centainly Energy, i.e. EPM(t)、EPN(t) it is consistently greater than zero.Therefore have:
EM(t) 0 <
EN(t) 0 <
(6) when breaking down for PM sections of route, have at this time:
EM(t)=EX(t)+EPN(t)
EN(t)=- EPN(t)
Wherein EX(t)、EPNIt (t) is respectively route and system PNThe energy absorbed.Due to system PNAnd the passive net such as route Network can only absorb energy, therefore EX(t)、EPN(t) it is not less than zero.Have at this time:
EM(t)≥0
EN(t) 0 <
(7) when breaking down for NQ sections of route, have at this time:
EM(t)=- EPM(t)
EN(t)=EX(t)+EPM(t)
Wherein EX(t)、EPMIt (t) is respectively route and system PMThe energy absorbed.Due to system PMAnd the passive net such as route Network can only absorb energy, therefore EX(t)、EPM(t) it is not less than zero.Have at this time:
EM(t) 0 <
EN(t)≥0
(8) accordingly, criterion is proposed:
Embodiment 1: establishing half-wave power transmission circuit emulation system model as shown in Figure 1, and model parameter selects extra-high voltage 1000kV line parameter circuit value, using extra-high voltage poles and towers shown in Fig. 2 as extra-high voltage half-wave power transmission overhead line structures, if route uniformly changes Position, both ends power-supply system, total track length 3000km, simulation step length are set as 100kHZ.Using analogue system shown in Fig. 3 to bus Fault condition is analyzed at positive direction F1 point and opposite direction F2 point two at M, the side M instantaneous power and transient state energy curve such as Fig. 4 It is shown.
By Fig. 4 (a) it is found that due to traveling wave between fault point and load catadioptric back and forth, the positive-negative polarity of instantaneous power Variation after the failure is simultaneously non-constant, this is because under zero original state energy-storage travelling wave tube of the energy in protection back side system it Between exchanged；Instantaneous power really remains constant to the obtained transient state energy polarity of time integral, then is because of it In resistance on the energy that consumes always monotone increasing, and any moment will all store part energy to energy-storage travelling wave tube after a failure Amount.
For N side direction relay R2For, there is identical criterion EN.In transmission line of electricity analogue system as shown in Figure 3, Respectively in transient state energy change curve such as Fig. 5 institute on route PM, away from both-end when breaking down on the end M 300km and NQ on MN Show.
When failure occurs in the area protected circuit MN, as shown in Fig. 5 (a), the transient state energy at the side M and the side N both ends is equal Less than zero, both-end differentiates that result is positive failure；When failure occurs at PM sections of route, as shown in Fig. 5 (b), the side M transient state energy Amount is greater than zero and the side N transient state energy for the side M, is determined as reverse fault less than zero, and the side N differentiates that result is opposite；Together Reason, as shown in Fig. 5 (c), when failure occurs at NQ sections of route, the side M is judged to forward direction, and the side N is judged to reversely.Therefore, bis- by M, N Extreme direction relay R1、R2It is as shown in table 1 below to may make up pilot protection decision table.
Table 1 is by directional relay R1、R2The pilot protection decision table of composition
Abort situation EM EN R1 P2 Differentiate result The result of decision
F1 -25300 -27120 - - MN segment fault in area Protection act
F2 21770 -13260 + - PM segment fault outside area It is latched R1-R2
F3 -14110 19430 - + NQ segment fault outside area It is latched R1-R2
Note: "-" represents positive direction failure in table, and "+" represents reverse direction failure
Embodiment 2: establishing power transformer interior fault Simulation Model as shown in Figure 1, and parameter is done in embodiment 1 It is described in detail, which is not described herein again.
Assuming that short-circuit resistance is 10 Ω, fault initial angle in MN sections of generation A phase ground short circuit failures of the side M positive direction route It is 60 °, simulating, verifying is carried out to different abort situation with the increment of 100km, the transient state energy value in 3ms in window is with failure Distance change is as shown in Figure 6.
It will be appreciated from fig. 6 that the transient state energy absolute value of troubles inside the sample space can be gradually reduced, but at end as fault distance increases It remains to reliably identify positive and negative direction failure when holding failure.
Assuming that A phase ground fault occurs at the positive direction 300km of the side M, fault initial angle is 60 °, transition resistance 0~ It is incremented by between 600 Ω with 30 Ω, the transient state energy value that the side M protection installation place detects is as shown in Figure 7.
As shown in Figure 7, with the increase of transition resistance, transient state energy absolute value is gradually reduced, but due to using direction member Part is substantially that forward and reverse failure is judged by the positive-negative polarity of transient state energy, not high to the size requirements of transient state energy value, And that a situation arises is few for high resistive fault in UHV transmission network, therefore need to only consider to escape setting valve and determine polarity i.e. Can, on the other hand, since transient state energy is the integral of instantaneous power, when selected in window, the size of energy must be able to satisfy Polarity judges necessary requirement.
A phase ground fault occurs at 300km assuming that moving in the right direction away from M, transition resistance is 10 Ω, fault initial angle 0~ It is incremented by between 90 ° with every 10 °, it is as shown in Figure 8 detects that transient state energy value changes with fault initial angle at the protection of the side M.
As shown in Figure 8, since transient state energy directional element is not relying on initial wavefront polarity, even if initial in failure When the very little of angle, the directionality of transient state energy is still obvious, and the directional element sensitivity thus constituted remains unchanged very high.
As a result prove that this method can effectively identification be single in the case where all fronts any position, Arbitrary Fault angle and transition resistance Phase ground fault realizes the identification of area's internal and external fault.Furthermore this method not by fault distance, transition resistance, fault initial angle shadow It rings.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept Put that various changes can be made.

Claims (2)

1. a kind of half-wave power transmission line protection method based on transient state energy, it is characterised in that: when detecting failure, pass through Transient state electrical quantity that head and end detects calculates voltage jump amount Δ u (t), jump-value of current Δ i (t), by transient voltage, The product of jump-value of current calculates instantaneous power P (t), and seeks transient state energy E (t), it is specified that electricity by the integral of instantaneous power Flowing positive direction is the direction that bus is directed toward route, and head end bus M side transient state energy is EM, the end side bus N transient state energy is EN, With its tectonic province internal and external fault criterion of the polarity of head and end transient state energy, if EM< 0 and ENMN segment fault in the area < 0, Ze Wei； If EM>=0 and EN< 0 is then system PMPM segment fault outside the side end P to the area at the end bus M；If EM< 0 and EN>=0, then it is bus N Hold system PNNQ segment fault outside the area at the side end Q.
2. the half-wave power transmission line protection method according to claim 1 based on transient state energy, it is characterised in that specific Step are as follows:
(1) pass through detection voltage failure componentWith line current fault componentDetection transmission line of electricity breaks down,For the number of transmission line of electricity three-phase；
(2) line voltage distribution fault component after transmission line malfunction occurs is extractedWith line current fault component For the number of transmission line of electricity three-phase；
(3) fault component system power P (t) is calculated:
P (t)=Δ ua×Δia+Δub×Δib+Δuc×Δic
A, b, c are the number of transmission line of electricity three-phase；
(4) transient state energy can be obtained in certain period of time upper integral or summation in power:
T indicates a certain moment after failure in formula, and 0 indicates fault moment；
(5) rated current positive direction is the direction that bus is directed toward route, when breaking down for MN sections of route, at this time:
EM(t)=- EPM(t)
EN(t)=- EPN(t)
EPM(t)、EPNIt (t) is respectively system PM、PNThe energy of consumption and storage, when existing simultaneously inductance and capacitor in system, There are the exchange of energy, E between inductance and capacitorPM(t)、EPN(t) any moment after a failure will all store certain energy Amount, i.e. EPM(t)、EPN(t) it is consistently greater than zero.Therefore have:
EM(t) 0 <
EN(t) 0 <
(6) when breaking down for PM sections of route, have at this time:
EM(t)=EX(t)+EPN(t)
EN(t)=- EPN(t)
Wherein EX(t)、EPNIt (t) is respectively route and system PNThe energy absorbed.Due to system PNAnd the passive networks such as route are only It can absorb energy, therefore EX(t)、EPN(t) it is not less than zero.Have at this time:
EM(t)≥0
EN(t) 0 <
(7) when breaking down for NQ sections of route, have at this time:
EM(t)=- EPM(t)
EN(t)=EX(t)+EPM(t)
Wherein EX(t)、EPMIt (t) is respectively route and system PMThe energy absorbed.Due to system PMAnd the passive networks such as route are only It can absorb energy, therefore EX(t)、EPM(t) it is not less than zero.Have at this time:
EM(t) 0 <
EN(t)≥0
(8) accordingly, criterion is proposed:
CN201811029179.8A 2018-09-05 2018-09-05 Half-wavelength power transmission line protection method based on transient energy Active CN109066614B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109901013A (en) * 2019-02-26 2019-06-18 郭润生 A method of differentiating distribution network failure direction using electric current, voltage jump amount polarity
CN110133434A (en) * 2019-04-03 2019-08-16 昆明理工大学 It is a kind of that UPFC and fixed series compensation C mixed compensation line protection method are contained based on transient state energy direction
CN110208623A (en) * 2019-06-19 2019-09-06 南京拓纳电气有限公司 The method of discriminating direction is quickly carried out when a kind of failure
CN113095741A (en) * 2021-05-21 2021-07-09 中国电力科学研究院有限公司 Method and device for planning grid-connected capacity of power electronic power supply
WO2021163888A1 (en) * 2020-02-18 2021-08-26 西门子股份公司 Ground fault detection method, device, and system for electric power system
CN113659548A (en) * 2021-08-23 2021-11-16 山东大学 Power distribution network pilot protection method and system based on positive sequence fault component energy direction

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CN101697411A (en) * 2009-10-29 2010-04-21 华南理工大学 Method for protecting transient state energy of DC power transmission line

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109901013A (en) * 2019-02-26 2019-06-18 郭润生 A method of differentiating distribution network failure direction using electric current, voltage jump amount polarity
CN110133434A (en) * 2019-04-03 2019-08-16 昆明理工大学 It is a kind of that UPFC and fixed series compensation C mixed compensation line protection method are contained based on transient state energy direction
CN110208623A (en) * 2019-06-19 2019-09-06 南京拓纳电气有限公司 The method of discriminating direction is quickly carried out when a kind of failure
CN110208623B (en) * 2019-06-19 2021-07-27 南京拓纳电气有限公司 Method for quickly judging direction during fault
WO2021163888A1 (en) * 2020-02-18 2021-08-26 西门子股份公司 Ground fault detection method, device, and system for electric power system
CN113095741A (en) * 2021-05-21 2021-07-09 中国电力科学研究院有限公司 Method and device for planning grid-connected capacity of power electronic power supply
CN113659548A (en) * 2021-08-23 2021-11-16 山东大学 Power distribution network pilot protection method and system based on positive sequence fault component energy direction

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