CN113411155B - Power distribution network clock synchronization system and method based on Ethernet transmission - Google Patents
Power distribution network clock synchronization system and method based on Ethernet transmission Download PDFInfo
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- CN113411155B CN113411155B CN202110679648.6A CN202110679648A CN113411155B CN 113411155 B CN113411155 B CN 113411155B CN 202110679648 A CN202110679648 A CN 202110679648A CN 113411155 B CN113411155 B CN 113411155B
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- 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
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- 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
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The application discloses a power distribution network clock synchronization system and method based on Ethernet transmission, and the system comprises: the output end of the B code master clock is connected with the input end of the master clock switch; the first output end of the master clock switch is connected with the first station domain type protection device; the second output end of the master clock switch is connected with the input end of a slave clock switch and used for carrying out clock synchronization in an Ethernet communication mode; the first output end of the slave clock switch is connected with the second station domain type protection device; the second output end of the slave clock switch is connected with the input end of another slave clock switch and is used for carrying out clock synchronization in an Ethernet communication mode; and the last slave clock switch is connected with the master clock switch to form a switch ring network for clock synchronization. The method and the device can solve the technical problems that the clock synchronization range is limited and the system layout cost is influenced due to the fact that the existing B code clock synchronization technology is mainly point-to-point transmission.
Description
Technical Field
The application relates to the technical field of power distribution network clock synchronization, in particular to a power distribution network clock synchronization system and method based on Ethernet transmission.
Background
At present, a protection strategy is designed by basically adopting a method for detecting short-circuit current due to a power distribution network protection system. With the use of clean energy encouraged by the country, new energy power generation will be developed vigorously. When new energy power generation is connected to a power distribution network, the current direction in the power distribution network is changed essentially. The original unidirectional transmission is changed into bidirectional transmission, and the bidirectional transmission is also called as multi-directional power supply access power distribution network. At this time, the method of detecting the short-circuit current is still used to design the protection strategy, and serious problems such as malfunction, maloperation, and failure of the protection system can occur. The precondition for realizing accurate detection is that all protection devices can realize high-precision clock synchronization, and the error is within 1 us.
The protection device is basically provided with an IRIG-B clock module and an interface, and an IRIG-B format time code (hereinafter referred to as a B code) is a time code of one frame per second and is most suitable for the actual use habit. And is the most commonly used high-precision clock synchronization signal in power systems. However, referring to fig. 3, the B code cannot be transmitted over the network, and the B code master clock and the protection device can only be connected point-to-point, so that the number and range of the distribution network protection devices that can be covered by one B code master clock are greatly limited, and the cost of the B code clock synchronization system is greatly increased in the discrete and large-range scenario of the distribution network.
Disclosure of Invention
The application provides a power distribution network clock synchronization system and method based on Ethernet transmission, which are used for solving the technical problems that the clock synchronization range is limited and the system layout cost is influenced because the existing B code clock synchronization technology is mainly point-to-point transmission.
In view of this, the first aspect of the present application provides a power distribution network clock synchronization system based on ethernet transmission, including: the system comprises a B-code master clock, a master clock switch and a plurality of slave clock switches;
the output end of the B code master clock is connected with the input end of the master clock switch;
the first output end of the master clock switch is connected with a first station domain type protection device;
the second output end of the master clock switch is connected with the input end of one slave clock switch and used for carrying out clock synchronization in an Ethernet communication mode;
the first output end of the slave clock switch is connected with a second station-based protection device;
the second output end of the slave clock switch is connected with the input end of another slave clock switch and is used for carrying out clock synchronization in an Ethernet communication mode;
and the last slave clock switch is connected with the master clock switch to form a switch ring network for clock synchronization.
Optionally, the master clock switch includes a first clock synchronization component, a first B-code pulse component, and a first network-side synchronization connection port, where the first B-code pulse component includes a B-code pulse receiving component and a first B-code pulse output component;
the first clock synchronization component is connected with the B code pulse receiving component, the first B code pulse output component and the first network side synchronous connection port;
and the first network side synchronous connection port is used as a second output end of the master clock switch and is connected with an input end of one slave clock switch.
Optionally, each slave clock switch includes a second clock synchronization component, a second B-code pulse component, and a second network-side synchronization connection port, where the second B-code pulse component includes a second B-code pulse output component;
the second clock synchronization component is connected with the second network side synchronization connection port and the second B code pulse output component;
and the second network side synchronous connection port is used as a second output end of the slave clock switch and is connected with the input end of another slave clock switch.
The second aspect of the present application provides a power distribution network clock synchronization method based on ethernet transmission, including:
synchronizing a first clock acquired from a satellite to a master clock switch in a B code pulse mode through a B code master clock;
the main clock switch carries out clock synchronization per se according to the first clock, and simultaneously packages the first clock into an Ethernet clock message to obtain a second clock;
synchronizing said second clock to a slave clock switch through said master clock switch;
the slave clock switch carries out clock synchronization per se according to the second clock, and simultaneously packages the second clock into an Ethernet clock message to obtain a third clock;
synchronizing the third clock to another slave clock switch through the one slave clock switch;
time is given to the corresponding station domain type protection device through each slave clock switch;
and performing time synchronization operation through the master clock switch according to the clock synchronization condition of the slave clock switch.
Optionally, the encapsulating, by the slave clock switch, the second clock into an ethernet clock packet while performing clock synchronization according to the second clock, to obtain a third clock, further includes:
and recording clock interaction information through the slave clock switch and storing the clock interaction information in the Ethernet clock message.
Optionally, the performing, by the master clock switch, a time synchronization operation according to the clock synchronization condition of the slave clock switch includes:
acquiring the clock interaction information in the Ethernet clock message of the last slave clock switch through the master clock switch;
and carrying out time synchronization operation according to the clock interaction information through the main clock switch.
According to the technical scheme, the embodiment of the application has the following advantages:
in this application, a power distribution network clock synchronization system based on ethernet transmission is provided, includes: the system comprises a code B master clock, a master clock switch and a plurality of slave clock switches; the output end of the B code master clock is connected with the input end of the master clock switch; the first output end of the master clock switch is connected with the first station domain type protection device; the second output end of the master clock switch is connected with the input end of a slave clock switch and used for carrying out clock synchronization in an Ethernet communication mode; the first output end of the slave clock switch is connected with the second station domain type protection device; the second output end of the slave clock switch is connected with the input end of another slave clock switch and is used for carrying out clock synchronization in an Ethernet communication mode; and the last slave clock switch is connected with the master clock switch to form a switch ring network for clock synchronization.
According to the power distribution network clock synchronization system based on Ethernet transmission, a clock switch is adopted to replace most of B code master clocks, a slave satellite is directly connected with a plurality of B code master clocks respectively, the technical scheme of time service tasks is changed into a mode of time service through connection of a plurality of slave clock switches and a master clock switch, namely the system only comprises one B code master clock and one master clock switch, and the transmission problem in the clock synchronization process is greatly reduced; moreover, only one slave clock switch is connected with the master clock switch, and other slave clock switches are connected in series to form a ring network, so that time is gradually given, and the clock time setting operation is finally completed; the clock synchronization transmission mode between the master clock switch and the slave clock switch and between the slave clock switch and the slave clock switch are Ethernet communication modes, and the method can be applied to a wide range of communication systems. Therefore, the method and the device can solve the technical problems that the clock synchronization range is limited and the system layout cost is influenced because the existing B-code clock synchronization technology is mainly point-to-point transmission.
Drawings
Fig. 1 is a schematic structural diagram of a power distribution network clock synchronization system based on ethernet transmission according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a power distribution network clock synchronization method based on ethernet transmission according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a conventional B-code master clock synchronization system provided in the background art of the present application;
fig. 4 is a schematic diagram illustrating message transmission of a ring network clock switch according to an embodiment of the present application;
fig. 5 is a schematic diagram of a clock synchronization message train structure according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The clock rate of the B code is 1/s, and the time frame period is 1 s; that is to say, the B-code time format frame is a continuous frame of one second, there is no interval in the middle, the B-master clock is connected with each protection device point-to-point in a pulse manner, and cannot be transmitted over the ethernet, so the time synchronization range of the B-code clock can only be the range that can be reached by the direct lines around it. In addition, from the analysis on the number of the B code ports, N ports and N connecting lines are needed when N devices are subjected to time synchronization in a point-to-point connection mode, and waste on layout cost is obviously caused.
For convenience of understanding, referring to fig. 1, an embodiment of a power distribution network clock synchronization system based on ethernet transmission provided in the present application includes: the system comprises a B-code master clock 101, a master clock switch 102 and slave clock switches 103, wherein the number of the slave clock switches 103 is multiple.
The output end of the B code master clock is connected with the input end of the master clock switch. After the B code master clock acquires time information from a satellite, time is synchronized to a master clock switch in an IRIG-B pulse mode, only one B code master clock and only one master clock switch are arranged in the system, namely, only one output end of the B code master clock is used for timing the master clock switch.
The first output end of the master clock switch is connected with the first station domain type protection device; the main clock switch can also directly carry out clock synchronization on a station domain type protection device, the clock synchronization on the protection device is also realized by transmitting clock information in an IRIG-B format through B code pulses, and then the protection device carries out self clock synchronization operation according to the synchronized clock information.
The second output of the master clock switch is connected to an input of a slave clock switch for clock synchronization by ethernet communication. The synchronization process is that the master clock switch sends an Ethernet-type clock synchronization message to the slave clock switch, and the slave clock switch updates the time according to the synchronized clock to complete the clock synchronization operation.
Furthermore, the master clock switch comprises a first clock synchronization component, a first B code pulse component and a first network side synchronous connection port, wherein the first B code pulse component comprises a B code pulse receiving component and a first B code pulse output component; the number of the first network side synchronous connection ports can be set according to requirements, and the first network side synchronous connection ports are mainly used as output ports and are connected with other slave clock switches; in this embodiment, the number of the first network-side synchronous connection ports is set to 2.
The first clock synchronization component is connected with the B code pulse receiving component, the first B code pulse output component and the first network side synchronous connection port; the first network side synchronous connection port is used as a second output end of the master clock switch and is connected with an input end of a slave clock switch. It should be noted that, the connection of the first clock synchronization component and the B-code pulse receiving component is to obtain a synchronization clock through the latter, and the connection with the first B-code pulse output component is to connect with a domain-based protection device to implement clock synchronization operation; the connection with the first network side synchronous connection port is used for carrying out time service on the slave clock switch; the first clock synchronization component in this embodiment is mainly used for clock synchronization processing of itself, and this process includes time correction processing, and sends the time correction processing to the first B code pulse output component, and then encapsulates the time into a B code pulse signal, and sends the B code pulse signal to the first B code pulse output component, and then sends the B code pulse signal to a corresponding station domain type protection device.
The first output end of the slave clock switch is connected with the second station domain type protection device; each slave clock switch has a corresponding station-domain protection device, which can be operated in clock synchronization.
The second output of the slave clock switch is connected to the input of another slave clock switch for clock synchronization by means of ethernet communication. The slave clock switch can receive the ethernet-type clock synchronization message sent by the master clock switch to obtain the master clock information, or obtain the clock synchronization message of the last slave clock switch to obtain the synchronization clock information.
Furthermore, each slave clock switch comprises a second clock synchronization component, a second B-code pulse component and a second network side synchronization connection port, wherein the second B-code pulse component comprises a second B-code pulse output component; in this embodiment, two synchronous connection ports on the second network side are set, one is used for receiving clock information of the clock switch for time service, and the other is used for sending an ethernet clock message for time service.
The second clock synchronization component is connected with the second network side synchronization connection port and the second B code pulse output component;
the second network-side synchronous connection port is connected as a second output of the slave clock switch to the input of another slave clock switch.
The second clock synchronization component is an Ethernet clock synchronization clock component, receives a clock synchronization message sent by the master clock switch or the slave clock switch from one network side synchronization connection port, and on one hand, forwards the message from the other network side synchronization connection port so that the message can be continuously transmitted to other slave clock switches; on one hand, the second clock synchronization component analyzes the message to obtain the clock error between the clock of the second clock synchronization component and the clock switch for time service. The slave clock switch adjusts the time of the slave clock switch to be consistent with the time of the clock switch for time service; and after the adjustment is finished, sending the time information to a second B code pulse output assembly. And the second B code pulse output component encapsulates the time information into information in an IRIG-B format and sends the information to a protection device of the station domain type rapid protection system.
And the last slave clock switch is connected with the master clock switch to form a switch ring network for clock synchronization. The master clock switch and all slave clock switches are connected in series, and the clock synchronization is a train transmission process, please refer to fig. 4.
In addition, when the master clock switch and the slave clock switches carry out clock synchronization, the clock synchronization condition of each slave clock switch can be recorded, after the number of the slave clock switches is determined, the master clock switch sends a clock synchronization message train, the initial message train consists of a master clock switch information section and a slave clock switch information section, and the number of the slave clock information sections is determined according to the number of the switches acquired by the number identification message. The clock synchronization message train structure is shown in fig. 5. When the message train is sent out, the slave clock exchanger information section is blank data.
And the slave clock switch acquires the synchronous information of the data section of the master clock switch, and fills the clock information needing to be interacted with the master clock switch into the corresponding slave clock switch information section. And finally, forwarding the clock synchronization message train from the other network side synchronous connection port.
And each slave clock switch fills self clock interaction information in the corresponding data segment in turn. And a network side synchronous connection port of the master clock switch receives the message train with all slave clock switch clock interaction information. There are two types of clock synchronization trains: an initial clock message train and an interactive clock message train. The initial clock message train bears the clock information of the master clock switch and the blank slave clock switch. The blank slave clock switch information is filled in by the slave clock switch as it passes through the corresponding slave clock switch. The switching clock message train bears the clock information of the master clock switch and the interaction information of the master clock switch and the slave clock switch. The mutual information is filled in the corresponding slave clock exchanger information section by the master clock exchanger before sending out the message train. And when the message train passes through the corresponding slave clock switch, the slave clock switch acquires information on the corresponding information section. And calculating the clock error of the main clock switch, and adjusting the clock.
According to the power distribution network clock synchronization system based on Ethernet transmission, a clock switch is adopted to replace most of B code master clocks, a slave satellite is directly connected with a plurality of B code master clocks respectively, the technical scheme of time service tasks is changed into a mode of time service through connection of a plurality of slave clock switches and a master clock switch, namely the system only comprises one B code master clock and one master clock switch, and the transmission problem in the clock synchronization process is greatly reduced; moreover, only one slave clock switch is connected with the master clock switch, and other slave clock switches are connected in series to form a ring network, so that time is gradually given, and the clock time setting operation is finally completed; the clock synchronization transmission mode between the master clock switch and the slave clock switch and between the slave clock switch and the slave clock switch are Ethernet communication modes, and the method can be applied to a wide range of communication systems. Therefore, the method and the device for clock synchronization can solve the technical problems that the clock synchronization range is limited and the system layout cost is influenced because the existing B-code clock synchronization technology is mainly point-to-point transmission.
For easy understanding, please refer to fig. 2, the present application provides an embodiment of a method for synchronizing a clock of a power distribution network based on ethernet transmission, including:
and step 207, performing time setting operation through the master clock switch according to the clock synchronization condition of the slave clock switch.
Further, the method includes that a slave clock switch performs clock synchronization according to a second clock, and simultaneously packages the second clock into an ethernet clock message to obtain a third clock, and the method further includes:
clock interaction information is recorded by the slave clock switch and stored in the ethernet clock message.
Further, the time setting operation is performed through the master clock switch according to the clock synchronization condition of the slave clock switch, and the time setting operation comprises the following steps:
clock interaction information is obtained in an Ethernet clock message of the last slave clock switch through the master clock switch;
and carrying out time synchronization operation through the main clock switch according to the clock interaction information.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (4)
1. A power distribution network clock synchronization system based on Ethernet transmission is characterized by comprising: the system comprises a B-code master clock, a master clock switch and a plurality of slave clock switches;
the output end of the B code master clock is connected with the input end of the master clock switch;
the first output end of the master clock switch is connected with a first station domain type protection device;
the second output end of the master clock switch is connected with the input end of one slave clock switch and used for carrying out clock synchronization in an Ethernet communication mode;
the master clock switch comprises a first clock synchronization component, a first B code pulse component and a first network side synchronous connection port, wherein the first B code pulse component comprises a B code pulse receiving component and a first B code pulse output component;
the first clock synchronization component is connected with the B code pulse receiving component, the first B code pulse output component and the first network side synchronous connection port;
the first network side synchronous connection port is used as a second output end of the master clock switch and is connected with an input end of one slave clock switch;
the first output end of the slave clock switch is connected with a second station-based protection device;
the second output end of the slave clock switch is connected with the input end of another slave clock switch and is used for carrying out clock synchronization in an Ethernet communication mode;
each slave clock switch comprises a second clock synchronization component, a second B-code pulse component and a second network side synchronous connection port, wherein the second B-code pulse component comprises a second B-code pulse output component;
the second clock synchronization component is connected with the second network side synchronization connection port and the second B code pulse output component;
the second network side synchronous connection port is used as a second output end of the slave clock switch and is connected with the input end of another slave clock switch;
and the last slave clock switch is connected with the master clock switch to form a switch ring network for clock synchronization.
2. A method for synchronizing clocks of a power distribution network based on ethernet transmission, which is used in the system of claim 1, and comprises:
synchronizing a first clock acquired from a satellite to a master clock switch in a B code pulse mode through a B code master clock;
the main clock switch carries out clock synchronization per se according to the first clock, and simultaneously packages the first clock into an Ethernet clock message to obtain a second clock;
synchronizing the second clock to a slave clock switch through the master clock switch;
the slave clock switch carries out clock synchronization per se according to the second clock, and simultaneously packages the second clock into an Ethernet clock message to obtain a third clock;
synchronizing the third clock to another slave clock switch through the one slave clock switch;
time is given to the corresponding station domain type protection device through each slave clock switch;
and performing time synchronization operation through the master clock switch according to the clock synchronization condition of the slave clock switch.
3. The method according to claim 2, wherein the slave clock switch performs clock synchronization with the second clock and encapsulates the second clock into an ethernet clock packet to obtain a third clock, and further comprising:
and recording clock interaction information through the slave clock switch and storing the clock interaction information in the Ethernet clock message.
4. The Ethernet transmission based clock synchronization method for the power distribution network according to claim 3, wherein the performing of the time synchronization operation by the master clock switch according to the clock synchronization condition of the slave clock switch comprises:
acquiring the clock interaction information in the Ethernet clock message of the last slave clock switch through the master clock switch;
and carrying out time synchronization operation according to the clock interaction information through the main clock switch.
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| CN103532230A (en) * | 2013-09-30 | 2014-01-22 | 国家电网公司 | Intelligent power distribution network IEEE1588 timing synchronization system on basis of industrial Ethernet tangency access rings |
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| CN101068133B (en) * | 2007-06-12 | 2011-05-04 | 华为技术有限公司 | Time synchronizing method, network communication system and equipment |
| CN103580846B (en) * | 2013-08-23 | 2017-03-01 | 北京东土科技股份有限公司 | A kind of method and system across non-1588 network transmission precision interval clock messages |
| CN103532231B (en) * | 2013-09-30 | 2015-05-27 | 国家电网公司 | Intelligent power distribution network IEEE1588 timing synchronization system on basis of industrial Ethernet direct connection access rings |
| CN107896134A (en) * | 2017-11-15 | 2018-04-10 | 中国电子科技集团公司第三十二研究所 | High-precision modularized time synchronization equipment |
| CN110798276B (en) * | 2018-08-02 | 2022-11-11 | 全球能源互联网研究院有限公司 | Time synchronization method and system for SDN (software defined network) of intelligent substation |
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| CN103532230A (en) * | 2013-09-30 | 2014-01-22 | 国家电网公司 | Intelligent power distribution network IEEE1588 timing synchronization system on basis of industrial Ethernet tangency access rings |
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