CN109980611B - Pilot differential protection adaptive synchronization method and device meeting IEEE C37.94 standard - Google Patents
Pilot differential protection adaptive synchronization method and device meeting IEEE C37.94 standard Download PDFInfo
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- CN109980611B CN109980611B CN201811432885.7A CN201811432885A CN109980611B CN 109980611 B CN109980611 B CN 109980611B CN 201811432885 A CN201811432885 A CN 201811432885A CN 109980611 B CN109980611 B CN 109980611B
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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
- H02H7/261—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 involving signal transmission between at least two stations
Abstract
The invention discloses a pilot differential protection self-adaptive synchronization method and a pilot differential protection self-adaptive synchronization device meeting an IEEE C37.94 standard, wherein the method comprises the following steps: the light longitudinal protection devices on the two sides respectively calculate the processing time of the light longitudinal data, and the processing time is respectively recorded as delta t1 and delta t 3; the two side optical longitudinal protection devices respectively calculate the waiting time from the completion of optical longitudinal data processing to the sending of a C37.94 message frame, and respectively record the waiting time as delta t2 and delta t 4; respectively transmitting the processing time and the waiting time to an optical longitudinal end; and the optical longitudinal protection devices on the two sides calculate stable communication time delta tm through a ping-pong algorithm according to the transmitted data, and calculate deviation dif between sampling points of optical longitudinal synchronization according to the communication time. The invention can automatically adapt to the conditions that the communication delay of the opposite side is inconsistent and the processing time caused by the hardware difference of the opposite side is inconsistent after the optical longitudinal device applies the C37.94 standard, the precision completely meets the synchronization requirement of the optical longitudinal protection algorithm, and the time which possibly causes jitter is eliminated, so the precision is higher, and the longitudinal differential protection is more reliable.
Description
Technical Field
The invention belongs to the field of sampling synchronization of relay protection of a power system, and relates to a pilot protection self-adaptive synchronization method based on an IEEE C37.94 standard.
Background
The longitudinal differential protection is also called as optical longitudinal protection, is a main protection commonly used in relay protection, plays an important role in stable and reliable operation of the relay protection, and currently, protection equipment of domestic mainstream relay protection manufacturers adopts optical fibers as media for transmission in the realization of longitudinal differential protection, but optical interface standards have great difference, and the method has no influence on maintenance for a special channel; however, most of the substations of 220kv and above in China at present are in a multiplex channel mode, the links through which optical fibers pass are more, if the channels are abnormal, self-loop detection needs to be carried out at ports of different links, troubleshooting is time-consuming and labor-consuming, and protection devices of different manufacturers are difficult to interconnect and intercommunicate.
The IEEE formulated the C37.94 standard in 2002, and revised in 2017, the standard standardizes the optical fiber connection between the protection device and the digital multiplexing equipment, so that the protection devices and the digital multiplexing equipment produced by different manufacturers can be interconnected and intercommunicated at the optical interface, and the level of channel fault location and monitoring can be improved.
Most of the existing synchronization methods for pilot differential protection are based on sampling channel synchronization methods, including a sampling time adjustment method, a sampling data correction method and a reference vector synchronization method. The methods are based on that the transmission delay of the sampling data of the devices on the opposite side is equal, and after the IEEE C37.94 standard is used, the transmission delay of the sampling data of the device on the opposite side is definitely not equal, so that the sampling synchronization method needs to be optimized.
Disclosure of Invention
The invention aims to solve the technical problem that the transmission delay of the sampling data on the opposite side is unequal after the IEEE C37.94 standard is used, and provides a pilot differential protection self-adaptive synchronization method.
In order to solve the technical problems, the invention adopts the following technical scheme:
the method for the pilot differential protection adaptive synchronization meeting the IEEE C37.94 standard comprises the following steps:
(1) the light longitudinal protection devices on the two sides respectively calculate the processing time of the light longitudinal data, and the processing time is respectively recorded as delta t1 and delta t 3;
(2) the two side optical longitudinal protection devices respectively calculate the waiting time from the completion of optical longitudinal data processing to the sending of a C37.94 message frame, and respectively record the waiting time as delta t2 and delta t 4;
(3) respectively transmitting the processing time and the waiting time to an optical longitudinal end;
(4) the optical longitudinal protection devices on the two sides calculate stable communication time delta tm through a ping-pong algorithm according to transmitted data, and calculate deviation dif between sampling points of optical longitudinal synchronization according to the communication time;
(5) and adjusting the sampling moments at the two sides according to the deviation to complete the complete synchronization of the optical longitudinal data.
Preferably, the transmission time of the optical longitudinal data on the line on the two sides is assumed to be consistent.
Further, the expression of the deviation dif is as follows:
dif＝Δtm-(t6-t4)。
further, the expression of the stable communication time Δ tm is:
Δtm＝(Δtn-Δtr)/2＝((t6-t7)-(t3-t2))/2,
wherein t is6＝(t5-(Δt1+Δt3))，t7＝(t1+Δt1+Δt2)。
In another aspect, the present invention provides a tandem differential protection adaptive synchronization device satisfying IEEE C37.94 standard, respectively disposed at the present side and the opposite side of an optical longitudinal device, including:
the time calculation module is used for calculating the processing time of the optical longitudinal data and the waiting time from the completion of the optical longitudinal data processing to the sending of the C37.94 message frame;
the data sending module is used for respectively transmitting the processing time and the waiting time to the optical longitudinal end;
the data synchronization module is used for calculating to obtain stable communication time delta tm according to the transmitted data through a ping-pong algorithm and calculating to obtain deviation dif between sampling points of optical longitudinal synchronization according to the communication time;
and the sampling time adjusting module is used for adjusting the sampling times at the two sides according to the deviation so as to complete the complete synchronization of the optical longitudinal data.
Preferably, in this technical solution, the expression of the stable communication time Δ tm is:
Δtm＝(Δtn-Δtr)/2＝((t6-t7)-(t3-t2))/2,
wherein t is6＝(t5-(Δt1+Δt3))，t7＝(t1+Δt1+Δt2)。
The invention achieves the following beneficial effects:
the invention provides a self-adaptive ping-pong synchronization algorithm for interconnection and intercommunication of optical longitudinal devices applying C37.94 standard, and can also adapt to the inconsistency of optical longitudinal communication time caused by upgrading a device on one side of the opposite side of a field optical longitudinal due to the improvement of hardware performance. The method can automatically adapt to the situation that the communication delay of the opposite side is inconsistent after the optical longitudinal device applies the C37.94 standard and the situation that the processing time caused by the hardware difference of the opposite side is inconsistent, the precision completely meets the synchronization requirement of the optical longitudinal protection algorithm, and the time which possibly causes jitter is eliminated, so the precision is higher, and the longitudinal differential protection is more reliable.
Drawings
FIG. 1 is a transmission diagram of IEEE C37.94;
fig. 2 is a schematic diagram of the optical longitudinal protection adaptive ping-pong synchronization method of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
When the IEEE C37.94 standard is applied, the data transmission delay of the devices on the two sides of the optical fiber side is inconsistent, the IEEE C37.94 standard specifies that the protection equipment and the digital multiple interface equipment adopt a unified standard for communication, and provides a transmission bandwidth of N (N is 1, 2, …, 12) multiplied by 64kbit/s, so that the protection equipment and the digital multiple interface equipment which are not used by manufacturers can be interconnected. As shown in fig. 1, after applying the IEEE C37.94 standard, both sides can only transmit the optical longitudinal data at each time of 125us, but the times of both sides of the optical longitudinal are not consistent, and the time to be transmitted after each device processes the optical longitudinal data is also not fixed, so the jitter of both sides of the optical longitudinal is theoretically between 0 us and 125us, and therefore these uncertain delay parts should be eliminated before applying the ping-pong synchronization algorithm, otherwise the optical longitudinal synchronization would be greatly affected, and the malfunction of the tandem differential protection would be caused.
And the device on both sides of the optical bench has inconsistent processing time due to the difference of hardware processors. Due to the difference of the loads of the devices on the two sides of the optical longitudinal device in operation, or due to the upgrade of the hardware processor, the difference of the operation speeds of the processors on the two sides of the optical longitudinal device, and the like, the time for the devices on the two sides of the optical longitudinal device to process the optical longitudinal is not consistent, and the ping-pong synchronization algorithm is influenced, so that the synchronization error of the optical longitudinal data is caused, and the misoperation is caused.
In order to solve the above problems, the present invention provides a pilot differential protection adaptive synchronization method satisfying IEEE C37.94 standard, comprising the steps of:
(1) the light longitudinal protection devices on the two sides respectively calculate the processing time of the light longitudinal data, and the processing time is respectively recorded as delta t1 and delta t 3;
(2) the two side optical longitudinal protection devices respectively calculate the waiting time from the completion of optical longitudinal data processing to the sending of a C37.94 message frame, and respectively record the waiting time as delta t2 and delta t 4;
(3) respectively transmitting the processing time and the waiting time to an optical longitudinal end;
(4) the optical longitudinal protection devices on the two sides calculate stable communication time delta tm through a ping-pong algorithm according to transmitted data, and calculate deviation dif between sampling points of optical longitudinal synchronization (deviation of the sampling points 33 and 15 on the same time axis) according to the communication time; with particular reference to FIG. 2
Wherein, Δ tm＝(Δtn-Δtr)/2＝((t6-t7)-(t3-t2))/2,
dif＝Δtm-(t6-t4).
(5) And adjusting the sampling moments at the two sides according to the deviation to complete the complete synchronization of the optical longitudinal data.
In another embodiment, the present invention provides a tandem differential protection adaptive synchronization device satisfying IEEE C37.94 standard, respectively disposed at the present side and the opposite side of an optical longitudinal device, including:
the time calculation module is used for calculating the processing time of the optical longitudinal data and the waiting time from the completion of the optical longitudinal data processing to the sending of the C37.94 message frame;
the data sending module is used for respectively transmitting the processing time and the waiting time to the optical longitudinal end;
the data synchronization module is used for calculating to obtain stable communication time delta tm according to the transmitted data through a ping-pong algorithm and calculating to obtain deviation dif between sampling points of optical longitudinal synchronization according to the communication time;
the expression of the stable communication time Δ tm is as follows:
Δtm＝(Δtn-Δtr)/2＝((t6-t7)-(t3-t2))/2,
wherein t is6＝(t5-(Δt1+Δt3))，t7＝(t1+Δt1+Δt2)。
dif＝Δtm-(t6-t4)。
And the sampling time adjusting module is used for adjusting the sampling times at the two sides according to the deviation so as to complete the complete synchronization of the optical longitudinal data.
The method of the invention has the following characteristics and functions:
(1) the optical ping-pong synchronization algorithm can automatically adapt to the uncertain transmission delay brought by introducing the C37.94 standard.
(2) The optical longitudinal ping-pong synchronization algorithm can automatically adapt to the jitter caused by the optical longitudinal ping-pong synchronization algorithm due to unequal processing time at two sides caused by hardware upgrading at one side of the optical longitudinal.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A pilot differential protection adaptive synchronization method meeting the IEEE C37.94 standard is characterized by comprising the following steps of:
(1) the two side light longitudinal protection devices respectively calculate the processing time of the light longitudinal data, and the processing time is respectively recorded as delta t1 and delta t 3;
(2) the two side optical longitudinal protection devices respectively calculate the waiting time from the completion of optical longitudinal data processing to the sending of a C37.94 message frame, and respectively record the waiting time as delta t2 and delta t 4;
(3) respectively transmitting the processing time and the waiting time to an optical longitudinal end;
(4) the optical longitudinal protection devices on the two sides calculate the stable communication time delta t through a ping-pong algorithm according to the transmitted datamAnd calculating the deviation dif between sampling points of the optical longitudinal synchronization according to the communication time; the expression of the deviation dif is:
dif＝Δtm-(t6-t4)。
the stable communication time DeltatmThe expression of (a) is:
Δtm＝(Δtn-Δtr)/2＝((t6-t7)-(t3-t2))/2，
wherein t is6＝(t5-(Δt1+Δt3))，t7＝(t1+Δt1+Δt2)，
(5) And adjusting the sampling moments at the two sides according to the deviation to complete the complete synchronization of the optical longitudinal data.
2. The adaptive synchronization method according to claim 1, wherein it is assumed that the transmission time of the optical longitudinal data on the line is identical.
3. A pilot differential protection adaptive synchronizer meeting IEEE C37.94 standard is respectively arranged at the side and the opposite side of an optical longitudinal device, and is characterized by comprising:
the time calculation module is used for calculating the processing time of the optical longitudinal data and the waiting time from the completion of the optical longitudinal data processing to the sending of the C37.94 message frame;
the data sending module is used for respectively transmitting the processing time and the waiting time to the optical longitudinal end;
a data synchronization module for calculating stable communication time delta t by ping-pong algorithm according to the transmitted datamAnd calculating the deviation dif between sampling points of the optical longitudinal synchronization according to the communication time;
the sampling time adjusting module is used for adjusting the sampling time at two sides according to the deviation to complete the complete synchronization of the optical longitudinal data;
the expression of the deviation dif is:
dif＝Δtm-(t6-t4)。
the expression of the stable communication time Δ tm is as follows:
the stable communication time DeltatmThe expression of (a) is:
Δtm＝(Δtn-Δtr)/2＝((t6-t7)-(t3-t2))/2，
wherein t is6＝(t5-(Δt1+Δt3))，t7＝(t1+Δt1+Δt2)。
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| CN111682929B (en) * | 2020-04-28 | 2023-03-31 | 南方电网数字电网研究院有限公司 | Low real-time optical longitudinal synchronization method and special electric power CPU chip |
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