CN109494694B - Data synchronization method, device, equipment and medium for line differential protection - Google Patents

Data synchronization method, device, equipment and medium for line differential protection Download PDF

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CN109494694B
CN109494694B CN201811412985.3A CN201811412985A CN109494694B CN 109494694 B CN109494694 B CN 109494694B CN 201811412985 A CN201811412985 A CN 201811412985A CN 109494694 B CN109494694 B CN 109494694B
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delay
line
local side
phasor
opposite side
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CN109494694A (en
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刘革明
窦乘国
陆征军
张少波
张宏波
许伟泉
宋丹丹
张齐
苗文彬
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Shanghai Shr Automation Co ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a data synchronization method, a device, equipment and a medium for line differential protection. The method comprises the following steps: determining the delay asymmetry of the line differential protection channel; determining the receiving time delay of the local side according to the channel time delay asymmetry and the average time delay of the line differential protection channel; and carrying out differential protection accurate data synchronization according to the local side receiving delay. The invention improves the reliability of the line differential protection, realizes a brand-new line differential protection data synchronization scheme and expands the application range of the line differential protection.

Description

Data synchronization method, device, equipment and medium for line differential protection
Technical Field
The embodiment of the invention relates to the technical field of relay protection, in particular to a data synchronization method, a data synchronization device, data synchronization equipment and a data synchronization medium for line differential protection.
Background
With the popularization of optical fiber communication technology, the line current differential protection based on the optical fiber channel has become the primary protection of choice for extra-high voltage lines. In order to make the differential protection of the line current independent of the external clock, the prior art mostly adopts a method of calculating the average delay of the receiving and the sending of the pilot channel, and carries out synchronous processing according to the average delay. However, there are many inconsistency situations in receiving and transmitting delays of the pilot channel, and the calculated average delay is inconsistent with the actual delay of the channel, so that data on two sides of the line are asynchronous, and current differential protection needs to be quitted when the data are serious.
Disclosure of Invention
The invention provides a data synchronization method, a device, equipment and a medium for line differential protection, which are used for accurately calculating the receiving delay of a line and improving the reliability of the line differential protection.
In a first aspect, an embodiment of the present invention provides a data synchronization method for line differential protection, where the method includes:
determining the channel delay asymmetry of the line differential protection;
determining the receiving time delay of the local side according to the channel time delay asymmetry and the channel average time delay of the line differential protection;
and carrying out accurate data synchronization according to the local side receiving delay.
Optionally, before the determining the channel delay asymmetry of the line differential protection, the method further includes:
according to the channel average delay, carrying out estimation data synchronization, and determining the estimated synchronous voltage phasor and the estimated synchronous current phasor of the local side of the line;
the determining the channel delay asymmetry of the line differential protection comprises:
determining the opposite side calculation voltage phasor of the line according to the local side estimation synchronous voltage phasor, the local side estimation synchronous current phasor and the impedance of the line;
and determining the channel delay asymmetry according to the opposite side sampling voltage phasor of the line and the opposite side calculation voltage phasor.
Optionally, the present-side estimated synchronous voltage phasor, the present-side estimated synchronous current phasor, the opposite-side sampled voltage phasor, and the opposite-side calculated voltage phasor include at least one of:
positive sequence component phasor, a phase a phasor, a phase B phasor, or a phase C phasor.
Optionally, before the determining the channel delay asymmetry according to the voltage phasor sampled at the opposite side of the line and the voltage phasor calculated at the opposite side of the line, the method further includes:
acquiring opposite side sampling voltage phasor of the line;
or acquiring a sampling value of the voltage at the opposite side of the line;
and acquiring the contralateral sampling voltage phasor according to the contralateral voltage sampling value.
Optionally, before the determining the channel delay asymmetry of the line differential protection, the method further includes:
acquiring a local side sending time scale and a local side receiving time scale of the line;
acquiring the difference between the opposite side sending time scale and the opposite side receiving time scale of the line;
and determining the average delay according to the local side sending time scale, the local side receiving time scale and the difference between the opposite side sending time scale and the opposite side receiving time scale of the line.
Optionally, the determining the local side receiving delay according to the channel delay asymmetry and the channel average delay of the line differential protection further includes:
the local side receiving delay is obtained by the following formula
Figure BDA0001877435060000031
Wherein, T1For local side reception delay, TAVEAnd P is the average delay, P is the asymmetry degree of the channel delay, and f is the frequency of the power grid where the line is located.
Optionally, the channel delay asymmetry is obtained by the following formula
Figure BDA0001877435060000032
Wherein α is the angular deviation;
Figure BDA0001877435060000033
the phase angle of the voltage phasor is sampled on the opposite side;
Figure BDA0001877435060000034
calculating the phase angle of the voltage phasor for the opposite side; k is an angle coefficient, if the phase angle is an angle unit, K is 360 degrees, the phase angle is a radian unit, and K is 2 pi.
Optionally, the line frequency is 50Hz or 60 Hz.
Optionally, the local side transmission delay of the line is obtained by the following formula
T2＝2*TAVE-T1
Wherein, T2Sending delay for the local side; the time difference between the sending delay and the receiving delay is smaller than the line period.
In a second aspect, an embodiment of the present invention further provides a data synchronization apparatus for line differential protection, where the apparatus includes:
the asymmetry determination module is used for determining the channel delay asymmetry of the line differential protection;
the receiving delay determining module is used for determining the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection;
and the data synchronization module is used for carrying out accurate data synchronization according to the local side receiving delay.
Optionally, the apparatus further comprises:
the phasor estimation module is used for carrying out estimation data synchronization according to the average delay and determining the estimated synchronous voltage phasor at the local side and the estimated synchronous current phasor at the local side of the line;
the asymmetry determination module includes:
the voltage calculation phasor determination submodule is used for determining the opposite side calculation voltage phasor of the line according to the local side estimation synchronous voltage phasor, the local side estimation synchronous current phasor and the impedance of the line;
and the asymmetry determination submodule is used for calculating phasor according to the contralateral sampling voltage phasor and the contralateral voltage and determining the channel delay asymmetry.
Optionally, the apparatus further comprises:
the local side time mark acquisition module is used for acquiring a local side sending time mark and a local side receiving time mark of the line;
the opposite side time mark acquisition module is used for acquiring the difference between the opposite side sending time mark and the symmetrical receiving time mark of the line;
and the average delay determining module is configured to determine the average delay according to the local side sending time stamp, the local side receiving time stamp, and a difference between the opposite side sending time stamp and the opposite side receiving time stamp.
Optionally, the receiving delay determining module is further configured to
The local side receiving delay is obtained by the following formula
Figure BDA0001877435060000041
Wherein, T1For local side reception delay, TAVEAnd P is the average delay, P is the asymmetry degree of the channel delay, and f is the frequency of the power grid where the line is located.
In a third aspect, an embodiment of the present invention further provides a line protection device, where the line protection device includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method as any of the embodiments of the invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the method according to any of the embodiments of the present invention.
The embodiment of the invention determines the accurate value of the local side receiving delay according to the channel delay asymmetry and the average delay of the line differential protection, namely, the relation between the average delay and the local side receiving delay and the relation between the average delay and the channel delay asymmetry are sought, so that the data on two sides of the line can be accurately synchronized, and the line protection equipment is prevented from being influenced by the consistency of the receiving delay and the sending delay of a longitudinal channel through once estimated data synchronization and once accurate data synchronization.
Drawings
Fig. 1 is a flowchart of a data synchronization method for line differential protection according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an opposite-side calculated voltage phasor and an opposite-side sampled voltage phasor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a ping-pong algorithm provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a line differential protection data synchronization apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a line protection device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a data synchronization method for line differential protection according to an embodiment of the present invention. The embodiment of the invention can be suitable for the data synchronization processing of the line differential protection by the line protection equipment, and is particularly suitable for the data synchronization processing of the differential protection based on the pilot channel. The method can be executed by a line differential protection data synchronization device of a line protection device, which can be implemented in software and/or hardware. The data synchronization device may be disposed on two sides of the line, where the side is referred to as a reference side and the opposite side is referred to as a synchronization side.
Referring to fig. 1, the method specifically includes the following steps:
and S110, determining the channel delay asymmetry of the line differential protection.
There are various methods for determining the channel delay asymmetry, which may include the following steps:
firstly, estimating data synchronization according to the channel average delay, and determining the estimated synchronous voltage phasor at the local side and the estimated synchronous current phasor at the local side of the circuit.
In the data synchronization process of the line differential protection, the time occupied by sending data to the opposite side is the receiving delay of the side or the sending delay of the opposite side, the time occupied by sending data to the opposite side is the sending delay of the side or the receiving delay of the opposite side, and in the process of synchronizing the data synchronization device of the side, the receiving delay of the side is mainly considered. However, the transmit delay and the receive delay cannot be directly obtained, and one method is that the transmit delay and the receive delay can be estimated by the average delay of the channel, so that the data synchronization will deviate from the actual data based on the average delay of the channel. The data to be synchronized can be the current sampling value of the opposite side and the voltage sampling value of the opposite side, and can also be the current phasor of the opposite side and the voltage phasor of the opposite side. If the synchronous data are the current sampling value and the voltage sampling value of the opposite side, the data synchronization device for line differential protection of the side also needs to convert the current sampling value and the voltage sampling value of the opposite side into the current phasor and the voltage phasor of the opposite side respectively. And synchronizing the opposite side current phasor and the opposite side voltage phasor on the basis of the channel average delay to obtain the local side estimated synchronous current phasor and the local side estimated synchronous voltage phasor.
And secondly, determining a line opposite side calculation voltage phasor according to the estimated synchronous voltage phasor of the side, the estimated synchronous current phasor of the side and the impedance of the line.
According to the line parameters, the opposite side calculated voltage phasor can be obtained by estimating the synchronous current phasor and the synchronous voltage phasor on the current side. For example, when the line has no fault, the capacitive reactance of the line is ignored, the line has no shunt reactor, and the calculated voltage phasor on the opposite side can be obtained through the ohm law of the line, as shown in the formula (1). Considering line capacitive reactance, the line has no shunt reactor, and the calculated voltage phasor on the opposite side can be obtained through a line ohm law as shown in formula (2). Considering the capacitive reactance of the line, the line is provided with a shunt reactor, and the calculated voltage phasor on the opposite side can be obtained through the ohm law of the line, as shown in the formula (3).
Figure BDA0001877435060000071
Figure BDA0001877435060000072
Figure BDA0001877435060000073
Wherein,
Figure BDA0001877435060000074
the voltage phasors are calculated for the opposite side,
Figure BDA0001877435060000075
the synchronous voltage phasor is estimated for the present side of the line,
Figure BDA0001877435060000076
estimating the synchronous current phasor, Z, for the local side of the lineLIs the line positive sequence impedance.
Figure BDA0001877435060000077
The synchronous capacitor current phasor is estimated for the present side of the line,
Figure BDA0001877435060000078
the synchronous reactor current phasor is estimated for the present side of the line.
Thirdly, according to the sampling voltage phasor at the opposite side of the line and the voltage phasor calculated at the opposite side, the channel delay asymmetry is determined.
The channel delay asymmetry can be obtained by subtracting the angle of the opposite side calculated voltage phasor from the angle of the opposite side sampled voltage phasor.
Fig. 2 is a schematic diagram of an opposite-side calculated voltage phasor and an opposite-side sampled voltage phasor according to an embodiment of the present invention. Referring to fig. 2, there is an angle deviation between the opposite-side calculated voltage phasor and the opposite-side sampled voltage phasor, and the channel delay asymmetry is defined as taking a scalar quantity for the angle deviation, as shown in equation (4), equation (4) is the deviation of the synchronous data calculated by the voltage phasor.
Figure BDA0001877435060000081
Wherein P is the channel delay asymmetry, α is the angle deviation,
Figure BDA0001877435060000082
the phase angle of the voltage phasor is sampled for the opposite side,
Figure BDA0001877435060000083
the phase angle of the voltage phasor is calculated for the opposite side, K is the angle coefficient, K is 360 ° when the phase angle is in angle units, and K is 2 π when the phase angle is in radian units.
And S120, determining the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection.
The reason for the existence of the angle deviation is caused by the fact that the average channel delay is inconsistent with the sending delay and the receiving delay, and the channel delay asymmetry can be obtained by seeking for the relation between the average channel delay and the sending delay and the receiving delay, so that the receiving delay of the local side can be determined according to the channel delay asymmetry and the average channel delay. Specifically, when the line is fault-free, there may be an equation relationship between the channel delay asymmetry and the channel average delay, for example, as shown in equation (5).
Figure BDA0001877435060000084
Wherein P is the channel delay asymmetry, TAVEFor channel mean delay, T1And f is the frequency of the power grid where the line is located.
The equation of the equation (5) is transformed to obtain the receiving delay T of the local side1As shown in formula (6).
Figure BDA0001877435060000091
The relationship between the average channel delay and the transmission and reception delays of the local side is shown in formula (7).
Figure BDA0001877435060000092
Equation transformation is carried out on the equation (7) to obtain the sending delay T of the side2Obtained as in formula (8)
T2＝2*TAVE-T1(8)
The frequency of the power grid of the line can be 50Hz or 60 Hz. Illustratively, the receive delay T is when the frequency of the line is 50Hz1Can be obtained by the formula (9).
Figure BDA0001877435060000093
Wherein, T1And T2The unit of (c) is ms.
Wherein, optionally, the local side receives the delay T1And the local side sends a delay T2The time difference is less than the period of the power grid where the line is located, namely the local side receives the delay T1And the local side sends a delay T2The relationship shown in the formula (10) is satisfied.
|T1-T2|<T (10)
Wherein T is the period of the power grid where the line is located. Local side receiving delay T1And the local side sends a delay T2Thus, the device is provided withThe arrangement avoids the condition that the angle deviation is larger than 180 degrees, and ensures that the angle deviation is within a half period.
And S130, performing accurate data synchronization according to the receiving delay of the local side.
The local side receiving delay calculated by the embodiment of the invention is the actual delay of the local side receiving data of the pilot channel, and the data synchronization is carried out on the basis of the actual delay, so that accurate synchronous data can be obtained.
The embodiment of the invention determines the accurate value of the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection, namely seeking the relationship between the average delay of the channel and the receiving delay of the local side and the relationship between the average delay of the channel and the asymmetry degree of the channel delay, thereby accurately synchronizing the data at two sides of the line, protecting the line protection equipment from the influence of the consistency of receiving and sending delays of a pilot channel through one-time estimation data synchronization and one-time accurate data synchronization, therefore, the problems that in the prior art, due to the fact that the calculated channel average delay is inconsistent with the channel actual delay, data on two sides of the line are asynchronous, and current differential protection needs to be quitted when the data are serious are solved, the reliability of the line differential protection is improved, a brand-new line differential protection data synchronization scheme is realized, and the application range of the line differential protection is expanded.
In the above embodiments, the phasor such as the estimated synchronous voltage phasor at the present side, the estimated synchronous current phasor at the present side, the sampled voltage phasor at the opposite side, and the calculated voltage phasor at the opposite side may include at least one of the following: positive sequence component phasor, a phase a phasor, a phase B phasor, or a phase C phasor. That is, the phasor in the embodiment of the present invention adopts the positive sequence component, and the a phase, the B phase or the C phase can all satisfy the relationship embodied by the formula provided in the embodiment of the present invention, and the reception delay of the local side can be calculated by using these phasors.
Fig. 3 is a schematic diagram of a ping-pong algorithm according to an embodiment of the present invention. Referring to fig. 3, in the foregoing embodiments, there are various methods for determining the average channel delay, and the embodiments of the present invention are described by taking a ping-pong algorithm as an example, where the step of determining the average channel delay may be before the step of determining the asymmetry of the channel delay of the line, and the method for determining the average channel delay specifically includes the following steps:
firstly, a local side sending time mark t3 and a local side receiving time mark t2 of a local side M of the circuit are obtained.
The local side transmission time scale t3 is a time point when the local side M transmits data to the opposite side N, and the local side reception time scale t2 is a time point when the local side M receives data transmitted by the opposite side N.
Second, the time difference between the contralateral transmission time stamp t1 and the contralateral reception time stamp t4 of the contralateral N of the line is obtained.
The time difference between the contralateral transmission time stamp t1 and the contralateral reception time stamp t4 can be obtained from the data transmitted from the contralateral N to the local M. Or by obtaining the contralateral transmit time stamp t1 and the contralateral receive time stamp t4 and then differencing them. The opposite side reception time stamp t4 is a time point when the opposite side N receives data transmitted from the own side M, and the opposite side transmission time stamp t1 is a time point when the opposite side N transmits data to the own side M.
Thirdly, determining the average delay of the channel according to the difference between the local side sending time mark t3, the local side receiving time mark t2, the opposite side sending time mark t1 and the opposite side receiving time mark t 4.
When the time marks of the local side and the opposite side device are consistent, the time difference between the local side receiving time mark T2 and the opposite side sending time mark T1 is the local side receiving delay T1The time difference between the opposite side receiving time mark T4 and the local side transmitting time mark T3 is the local side transmitting time delay T2However, since the present-side M and the opposite-side N timing reference are not generally coincident, the present-side reception delay T cannot be determined by calculating the time difference between the present-side reception timing T2 and the opposite-side transmission timing T1, and by calculating the time difference between the opposite-side reception timing T4 and the present-side transmission timing T31And the local side sends a delay T2. There are various methods for determining the average delay of the channel according to the difference between the local side transmission time scale t3, the local side reception time scale t2, the opposite side transmission time scale t1 and the opposite side reception time scale t4, taking the ping-pong algorithm as an example, four time scales form a trapezoid, the opposite side reception time scale t4 and the opposite side transmission time scale t1 are differentiated to obtain the length of the lower bottom, the local side reception time scale t2 and the local side transmission time scale t3 are differentiated to obtain the length of the upper bottom, and the length of the lower bottom is differentiated from the length of the upper bottom to obtain the length of the upper bottomObtaining local side receiving delay T1And the local side sends a delay T2The sum of (1). Suppose that the local side receives the delay T1And the local side sends a delay T2Is equal, then the local side receives the delay T1And the local side sends a delay T2Are all equal to the channel average delay, as shown in equation (11) below.
Figure BDA0001877435060000111
Wherein, TAVEIs the channel average delay.
The embodiment of the invention also provides a data synchronization device for line differential protection. Fig. 4 is a schematic structural diagram of a line differential protection data synchronization apparatus according to an embodiment of the present invention. Referring to fig. 4, the data synchronization apparatus for line differential protection includes: an asymmetry determination module 401, a reception delay determination module 402 and a data synchronization module 403. The asymmetry determination module 401 determines a channel delay asymmetry of the line; the receiving delay determining module 402 determines the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection; the data synchronization module 403 performs accurate data synchronization according to the local side reception delay.
On the basis of the foregoing embodiments, optionally, the apparatus further includes: and the phasor estimation module is used for carrying out estimation data synchronization according to the channel average delay, and determining the estimated synchronous voltage phasor at the local side of the circuit and the estimated synchronous current phasor at the local side.
The asymmetry determination module further comprises: a voltage calculation phasor determination submodule and an asymmetry determination submodule. The voltage calculation phasor determination submodule determines a line opposite side calculation voltage phasor according to the local side estimation synchronous voltage phasor, the local side estimation synchronous current phasor and the impedance of the line; and the asymmetry determination submodule determines the channel delay asymmetry according to the opposite side sampling voltage phasor and the opposite side calculation voltage phasor of the line.
On the basis of the foregoing embodiments, optionally, the apparatus further includes: the device comprises a local side time mark acquisition module, an opposite side time mark acquisition module and an average delay determination module. The local side time mark acquisition module acquires a local side sending time mark and a local side receiving time mark of a line; the contralateral time mark acquisition module acquires the difference between a contralateral sending time mark and a contralateral receiving time mark of the line; and the channel average delay determining module determines the channel average delay according to the difference between the local side sending time mark, the local side receiving time mark, the opposite side sending time mark and the opposite side receiving time mark.
On the basis of the foregoing embodiments, optionally, the receiving delay determining module is further configured to obtain the receiving delay by the following formula
Figure BDA0001877435060000121
Wherein, T1For delay of reception, TAVEFor the average delay of the channel, P is the asymmetry, and f is the frequency of the grid in which the line is located.
The device can execute the method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Fig. 5 is a schematic structural diagram of a line protection device according to an embodiment of the present invention. As shown in fig. 5, the apparatus includes: one or more processors 51 and storage 52; the processor 51 in the device may be one or more, and fig. 5 takes one processor 51 as an example; storage 52 is used to store one or more programs; the one or more programs are executed by the one or more processors 51, so that the one or more processors 51 implement the line differential protection data synchronization method according to any one of the embodiments of the present invention.
The apparatus may further include: an input device 53 and an output device 54.
The processor 51, the storage means 52, the input means 53 and the output means 54 in the device may be connected by a bus or other means, as exemplified by a bus connection in fig. 5.
The storage device 52 in the apparatus is used as a computer-readable storage medium for storing one or more programs, which may be software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the data synchronization method for line differential protection provided by the embodiment of the present invention (for example, the modules in the data synchronization device for line differential protection shown in fig. 4 include an asymmetry degree determination module, a transmission delay time determination module, a reception delay time determination module, and a data synchronization module). The processor 51 executes various functional applications of the device and data processing by running software programs, instructions and modules stored in the storage device 52, that is, implements the data synchronization method of the line differential protection in the above method embodiments.
The storage device 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the device, and the like. Further, the storage 52 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the storage 52 may further include memory located remotely from the processor 51, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 53 may be used to receive input numeric or character information and generate key signal inputs relating to user settings and function control of the apparatus. The output device 54 may include a display device such as a display screen.
And, when the one or more programs included in the above-described apparatus are executed by the one or more processors 51, the programs perform operations including, but not limited to:
determining the channel delay asymmetry of the line differential protection;
determining the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection;
and carrying out accurate data synchronization according to the receiving delay of the local side.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, where the computer program is used to execute a data synchronization method for line differential protection when executed by a processor, and the method includes, but is not limited to:
determining the channel delay asymmetry of the line differential protection;
determining the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection;
and carrying out accurate data synchronization according to the receiving delay of the local side.
Optionally, the program, when executed by the processor, may be further configured to perform a data synchronization method for line differential protection according to any embodiment of the present invention.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (11)

1. A data synchronization method for line differential protection is characterized by comprising the following steps:
according to the average delay of the channels, carrying out estimation data synchronization, and determining the estimated synchronous voltage phasor at the local side and the estimated synchronous current phasor at the local side of the line;
determining the opposite side calculation voltage phasor of the line according to the local side estimation synchronous voltage phasor, the local side estimation synchronous current phasor and the impedance of the line;
according to the voltage phasor sampled by the opposite side of the line and the voltage phasor calculated by the opposite side, determining the channel delay asymmetry;
determining the receiving time delay of the local side according to the channel time delay asymmetry and the channel average time delay of the line differential protection;
wherein, the local side receiving delay is obtained by the following formula
Figure FDA0002344821380000011
Wherein, T1For local side reception delay, TAVEThe average delay is obtained, P is the asymmetry degree of the channel delay, and f is the frequency of the power grid where the line is located;
and carrying out accurate data synchronization according to the local side receiving delay.
2. The method of claim 1, wherein the present-side estimated synchronous voltage phasor, the present-side estimated synchronous current phasor, the opposite-side sampled voltage phasor, and the opposite-side calculated voltage phasor comprise at least one of:
positive sequence component phasor, a phase a phasor, a phase B phasor, or a phase C phasor.
3. The method of claim 1, further comprising, prior to said determining said channel delay asymmetry from said opposite side sampled voltage phasor and said opposite side calculated voltage phasor for said line:
acquiring opposite side sampling voltage phasor of the line;
or acquiring a sampling value of the voltage at the opposite side of the line;
and acquiring the contralateral sampling voltage phasor according to the contralateral voltage sampling value.
4. The method according to any of claims 1-3, further comprising, prior to determining the channel delay asymmetry for the line differential protection:
acquiring a local side sending time scale and a local side receiving time scale of the line;
acquiring the difference between the opposite side sending time scale and the opposite side receiving time scale of the line;
and determining the average delay according to the local side sending time scale, the local side receiving time scale and the difference between the opposite side sending time scale and the opposite side receiving time scale of the line.
5. The method of claim 1, wherein the channel delay asymmetry is obtained by the following equation
Figure FDA0002344821380000021
Wherein α is the angular deviation;
Figure FDA0002344821380000022
the phase angle of the voltage phasor is sampled on the opposite side;
Figure FDA0002344821380000023
calculating the phase angle of the voltage phasor for the opposite side; k is an angle coefficient, if the phase angle is an angle unit, K is 360 degrees, the phase angle is a radian unit, and K is 2 pi.
6. The method according to claim 5, characterized in that the frequency of the grid on which the line is located is 50Hz or 60 Hz.
7. The method of claim 5, wherein the local side transmission delay of the line is obtained by the following formula
T2＝2*TAVE-T1
Wherein, T2Sending delay for the local side; and the time difference between the local side sending delay and the local side receiving delay is smaller than the period of the power grid where the line is located.
8. A data synchronization device for line differential protection, comprising:
the phasor estimation module is used for carrying out estimation data synchronization according to the average delay and determining the estimated synchronous voltage phasor at the local side and the estimated synchronous current phasor at the local side of the line;
the voltage calculation phasor determination module is used for determining the opposite side calculation voltage phasor of the line according to the local side estimation synchronous voltage phasor, the local side estimation synchronous current phasor and the impedance of the line;
the asymmetry determination module is used for calculating voltage phasor according to the opposite side sampling voltage phasor and the opposite side to determine the channel delay asymmetry;
the receiving delay determining module is used for determining the receiving delay of the local side according to the channel delay asymmetry and the channel average delay of the line differential protection;
wherein, the local side receiving delay is obtained by the following formula
Figure FDA0002344821380000031
Wherein, T1For local side reception delay, TAVEThe average delay is obtained, P is the asymmetry degree of the channel delay, and f is the frequency of the power grid where the line is located;
and the data synchronization module is used for carrying out accurate data synchronization according to the local side receiving delay.
9. The apparatus of claim 8, further comprising:
the local side time mark acquisition module is used for acquiring a local side sending time mark and a local side receiving time mark of the line;
the contralateral time mark acquisition module is used for acquiring the difference between a contralateral sending time mark and a contralateral receiving time mark of the line;
and the average delay determining module is configured to determine the average delay according to the local side sending time stamp, the local side receiving time stamp, and a difference between the opposite side sending time stamp and the opposite side receiving time stamp.
10. A line protection device, comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 1-7.
11. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-7.
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CN109946561B (en) * 2019-05-13 2022-02-18 上海思源弘瑞自动化有限公司 Current transformer polarity testing method, device, equipment and storage medium
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101540500A (en) * 2009-04-28 2009-09-23 南京中德保护控制系统有限公司 Data synchronization method of digital optical fiber differential protective clock by relay method
CN103201923A (en) * 2010-11-09 2013-07-10 Abb研究有限公司 Synchronization method for current differential protection
CN105896738A (en) * 2016-06-01 2016-08-24 许继集团有限公司 Sampling synchronization method and device based on protective smart center
EP3255820A1 (en) * 2016-06-06 2017-12-13 Sprecher Automation GmbH Method for synchronized capture of measurement data required for controlling differential protection devices of electrical power lines
CN108054740A (en) * 2017-12-22 2018-05-18 南京因泰莱电器股份有限公司 A kind of T-shaped patching fibers longitudinal difference protection method of data synchronization

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101540500A (en) * 2009-04-28 2009-09-23 南京中德保护控制系统有限公司 Data synchronization method of digital optical fiber differential protective clock by relay method
CN103201923A (en) * 2010-11-09 2013-07-10 Abb研究有限公司 Synchronization method for current differential protection
CN105896738A (en) * 2016-06-01 2016-08-24 许继集团有限公司 Sampling synchronization method and device based on protective smart center
EP3255820A1 (en) * 2016-06-06 2017-12-13 Sprecher Automation GmbH Method for synchronized capture of measurement data required for controlling differential protection devices of electrical power lines
CN108054740A (en) * 2017-12-22 2018-05-18 南京因泰莱电器股份有限公司 A kind of T-shaped patching fibers longitudinal difference protection method of data synchronization

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