CN114710225A - Devices, systems, substations for substation time synchronization - Google Patents

Abstract

The application relates to the technical field of communication, and discloses a device for transformer substation time synchronization, includes: a receiving unit configured to receive a first time service signal and a second time service signal; the clock unit is used for determining an optimal time source according to the first time service signal and the second time service signal; and the output unit is used for forwarding the optimal time source. The device for time synchronization of the transformer substation is composed of a receiving unit, a clock unit and an output unit. The receiving unit can receive different types of time signals, and the clock unit determines the optimal time source, so that the optimal time source is used as the time signal sent to the time service equipment, the reliability of the time source received by the time service equipment is improved, and the reliability of time synchronization is improved. The application also discloses a system for time synchronization of the transformer substation and the transformer substation.

Description

Devices, systems, substations for substation time synchronization

technical field

The present application relates to the field of communication technologies, for example, to a device, system, and substation for time synchronization of substations.

Background technique

The power industry is one of the most important basic industries in the country, and the security of the power grid directly affects the national economy, people's livelihood and national security. With the development of the strong and smart grid, the level of power automation is getting higher and higher, and the substation monitoring system has put forward higher requirements for real-time data sampling synchronization, especially involving transient and dynamic data such as vector measurement, fault recording, and merging units. The requirements for the accuracy of information and data are also getting higher and higher, and the importance of time as the basis of informatization and automation in the power system is becoming increasingly prominent.

At present, in the related art, in order to ensure the time synchronization of timing signals, a time synchronization method is disclosed, which includes: acquiring an air interface signal sent by a 5G base station; analyzing the air interface signal to obtain first time information; The information is calculated to obtain second time information; and time synchronization with the base station is realized according to the second time information.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

In the related art, the first time information is obtained according to the air interface signal of the 5G base station and the second time information is obtained by calculation, which essentially uses a single timing signal for time synchronization. When the timing signal is interfered or cannot be received, it cannot be Ensure the reliability of time synchronization.

SUMMARY OF THE INVENTION

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor to identify key/critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide an apparatus, system, and substation for time synchronization of substations, so as to improve the reliability of time synchronization.

In some embodiments, the apparatus for substation time synchronization includes:

a receiving unit, configured to receive the first timing signal and the second timing signal;

a clock unit, configured to determine an optimal time source according to the first timing signal and the second timing signal;

The output unit is configured to forward the optimal time source.

Optionally, the first timing signal is a satellite timing signal, and the second timing signal is a ground timing signal.

Optionally, a clock unit, including:

a time quality judgment unit, configured to determine the optimal time source according to the time quality of the first timing signal and the second timing signal;

The transmission delay compensation unit is configured to calculate and compensate the transmission delay of the optimal time source.

Optionally, the time quality judgment unit, including:

a time quality determination subunit, configured to determine the time quality of the first timing signal and the second timing signal according to the time frame information of the first timing signal and the second timing signal;

The time signal selection subunit is configured to determine the optimal time source according to the determined correspondence between the time quality and the preset priority.

Optionally, the device for substation time synchronization may include:

The signal synchronization unit is configured to send the first timing signal and/or the second timing signal to other devices for substation time synchronization.

In some embodiments, the system for substation time synchronization includes:

A plurality of the above-mentioned apparatuses for time synchronization of substations, as master clocks; and

Multiple slave clocks, each slave clock is configured to receive the optimal time source sent by the master clock, and forward the optimal time source to the corresponding timed device.

Optionally, the system may include:

The time synchronization monitoring and management device is configured to monitor the time synchronization process of the slave node, and report alarm information when an abnormality occurs in the time synchronization process of the slave node;

Among them, the time synchronization process of the slave node is the process of forwarding the optimal time source from the master clock to the slave clock and the process of forwarding the optimal time source from the clock to the corresponding timed device.

Optionally, the time synchronization monitoring and management device includes:

The slave node transceiver unit is configured to send a monitoring clock request to the slave node, and receive the corresponding monitoring request result sent from the slave node;

The alarm information reporting unit is configured to judge whether there is an abnormality according to the monitoring clock request and the corresponding monitoring request result, and report the alarm information in the case of abnormality.

Optionally, an alarm information reporting unit, including:

The internal clock time difference determination subunit is configured to determine the internal clock time difference according to the time stamp of the monitoring clock request and the time stamp of the corresponding monitoring request result;

The abnormality judging subunit is configured to judge that the corresponding process is abnormal when the time difference between the internal clocks reaches a preset threshold;

The alarm reporting subunit is configured to report corresponding alarm information in the event of an abnormality.

In some embodiments, the substation includes:

The above system for time synchronization of substations.

The device, system, and substation for time synchronization of substations provided by the embodiments of the present disclosure can achieve the following technical effects:

A device for substation time synchronization composed of a receiving unit, a clock unit, and an output unit. Different types of timing signals can be received by the receiving unit, and the optimal time source can be determined by the clock unit, so as to use the optimal time source as the time signal sent to the time-served equipment, and improve the reliability of the time source received by the time-served equipment. , thereby improving the reliability of time synchronization.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the accompanying drawings, which are not intended to limit the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings do not constitute a limitation of scale, and in which:

FIG. 1 is a schematic diagram of an apparatus for substation time synchronization provided by an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another apparatus for substation time synchronization provided by an embodiment of the present disclosure;

3 is a schematic diagram of time quality judgment of an apparatus for substation time synchronization provided by an embodiment of the present disclosure;

4 is a schematic diagram of a system for substation time synchronization provided by an embodiment of the present disclosure;

5 is a schematic diagram of a time synchronization monitoring and management device of a system for substation time synchronization provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of clock time difference of a system for substation time synchronization provided by an embodiment of the present disclosure.

Detailed ways

In order to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, numerous details are provided to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

The terms "first", "second" and the like in the description and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the purposes of implementing the embodiments of the disclosure described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion.

Unless stated otherwise, the term "plurality" means two or more.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B means: A or B.

The term "and/or" is an associative relationship describing objects, indicating that three relationships can exist. For example, A and/or B, means: A or B, or, A and B three relationships.

The term "correspondence" may refer to an association relationship or a binding relationship, and the correspondence between A and B refers to an association relationship or a binding relationship between A and B.

IRIG-B, IRIG-B code (inter-range instrumentation group-B) is an electrical term. IRIG signals are often used to refer to a complete set of serial timecodes that transmit information about date and time using a continuous stream of binary data. Each time code format can be distinguished by signal characteristics, such as modulated or unmodulated, which requires different signal transmission methods based on the data rate and the type of information contained in the transmitted data.

G.703 is a proposal to connect DCE (Digital Communication Equipment, Data Communication Equipment) to a data high-speed synchronous communication service. The G.703 interface communicates through the physical interface, including the rate from 64Kbps to 2048Kbps, where the rate of 2048Kbps can be understood as 2M G.703.

PPS (pulse per second, pulse per second), PPM (pulse per minute, pulse per minute), and PPH (pulse per second) are power terms.

DL/T 476, application layer protocol for real-time data communication in power systems.

DL/T 634.5104, Telecontrol Equipment and Systems Part 5-103: Transmission Protocol Supporting Standards for Information Interfaces of Relay Protection Equipment.

With reference to FIG. 1 , an apparatus for time synchronization of a substation provided by an embodiment of the present disclosure includes: a receiving unit 11 , a clock unit 12 , an output unit 13 , and a power source 14 . The receiving unit 11 is configured to receive the first timing signal and the second timing signal. The first timing signal may be composed of multiple timing signal receiving modules 11-1, and each timing signal receiving module 11-1 includes: an antenna, a feeder, a low noise amplifier, a lightning protection device and a receiver, wherein the lightning protection protection not shown in the diagram. The second timing signal can be composed of a plurality of timing signal receiving modules, and the timing signal receiving modules include an IRIG-B module 11-2 and a 2M G.703 module 11-3. The clock unit 12 is configured to determine the optimal time source according to the first timing signal and the second timing signal. The output unit 13 is configured to convert the basic time frequency information inside the clock into a time synchronization code required by the project, including but not limited to PPS/PPM/PPH, IRIG-B encoding, serial encoding, and NTP/PTP protocols. Then, the code is output to each time-consuming device or the time-served equipment through the electrical interface. The output electrical interface includes TTL, RS485/RS232, optical fiber, IRIG(AC), Ethernet port. It should be understood that the electrical interfaces that can be used for output include but are not limited to the interfaces shown in FIG. 1 , which can be selected according to actual working conditions, which are not specifically limited in this application. The power supply 14 is configured to supply power to the device used for time synchronization of the substation, and multiple power supplies are used to form an active-standby redundant configuration, so as to ensure the normal operation of the time synchronization device and improve the reliability of operation.

With reference to FIG. 2 , an embodiment of the present disclosure provides an apparatus for substation time synchronization, including:

The receiving unit 11 is configured to receive the first timing signal and the second timing signal.

In the embodiment of the present disclosure, the first timing signal and the second timing signal are different types of timing signals. The first timing signal and the second timing signal may be wireless signals or wired signals.

Optionally, the first timing signal is a satellite timing signal, and the second timing signal is a ground timing signal.

In practical applications, the satellite timing signal can be the Beidou satellite timing signal or the global positioning system timing signal. The ground timing signal can be a local clock timing signal or a communication system synchronous network resource timing signal. The communication system synchronization network resource timing signal can be understood as a timing signal sent through the communication network frequency synchronization system.

The clock unit 12 is configured to determine the optimal time source according to the first timing signal and the second timing signal.

In the embodiment of the present disclosure, the clock unit selects the optimal external time reference signal as the optimal time source according to the multi-time source state judgment and selection mechanism, pulls the unit into the tracking lock state, and compensates for the transmission delay. The clock unit is controlled by the external timing signal and outputs the time synchronization signal and time information synchronized with it.

The output unit 13 is configured to forward the optimal time source.

In the embodiment of the present disclosure, the output unit converts the internal basic time frequency information into a time synchronization code required by the project, and forwards the converted code to each time-consuming device or time-consuming device or time-served device through an electrical interface.

Using the device for time synchronization of substations provided by the embodiments of the present disclosure, the device for time synchronization of substations can be composed of a receiving unit, a clock unit, and an output unit. Different types of timing signals can be received by the receiving unit, and the optimal time source can be determined by the clock unit, so as to use the optimal time source as the time signal sent to the time-served equipment, and improve the reliability of the time source received by the time-served equipment. , thereby improving the reliability of time synchronization.

Optionally, a clock unit, including:

a time quality judgment unit, configured to determine the optimal time source according to the time quality of the first timing signal and the second timing signal;

The transmission delay compensation unit is configured to calculate and compensate the transmission delay of the optimal time source.

In the embodiment of the present disclosure, the time quality judgment unit can be understood as a multi-time source state judgment and selection mechanism of the clock unit, and the validity, correctness, and reliability of the time signal are judged by the time quality judgment unit, and filtered. Then the priority relationship with the time source determines the optimal time source. It should be understood that the filtering processing of the timing signal belongs to a relatively mature prior art, which will not be repeated in this application.

Optionally, the time quality judgment unit, including:

a time quality determination subunit, configured to determine the time quality of the first timing signal and the second timing signal according to the time frame information of the first timing signal and the second timing signal;

In the embodiment of the present disclosure, the time frame of the first timing signal and the time frame of the second timing signal include the time-synchronized punctual delay and the time information of the serial port message. The time quality determination subunit compares and judges the time quality of the timing signal according to the information contained in the time frame. The judging factors of time quality include the validity, correctness and reliability of the time signal.

The time signal selection subunit is configured to determine the optimal time source according to the determined correspondence between the time quality and the preset priority.

In the embodiment of the present disclosure, there are corresponding preset priorities among different timing signals, and in the case of the same time quality, the priority of the first timing signal is higher than that of the second timing signal. In the case of different time quality, the weight of each timing signal can be determined according to the time quality of the timing signal time. The optimal time source is determined according to the corresponding relationship between the determined weight of the timing signal and the preset priority. Table 1 below provides an example table of the correspondence between the weight of the timing signal and the preset priority, and the example of the correspondence table is used to indicate the correspondence between the weight of the timing signal and the preset priority.

Table 1

Weight of timing signal Default priority first weight first priority second weight second priority … … Nth weight Nth priority

In practical applications, the weight proportions from the first weight to the Nth weight are successively reduced, and the priority relationship between the first priority and the Nth priority is successively reduced.

In practical applications, with reference to FIG. 3 , a schematic diagram of time quality judgment of an apparatus for substation time synchronization provided by an embodiment of the present disclosure is shown. The plurality of first timing signals 22 and the plurality of second timing signals 23 send time frame information to the quality judgment unit 21, and the time quality judgment unit 21 judges the time quality of each timing signal according to the above time frame information. And according to the corresponding relationship between the time quality and the preset priority, each timing signal is comprehensively determined. The switching timing signal is detected according to the result of the comprehensive determination of the time quality and the preset priority, and the switched timing signal is used as the optimal time source 24 .

In the embodiment of the present disclosure, the transmission delay compensation unit calculating and compensating the transmission delay of the optimal time source can be understood as compensating the transmission delay of the timing signal to the device for time synchronization of the substation, and/or for the time synchronization of the substation The transmission delay of the device forwarding the optimal time source.

In practical applications, the first timing signal sending end, the second timing signal sending end or the device used for substation time synchronization can be understood as the time reference sending side, and the device used for substation time synchronization or the time service equipment can be understood as time Reference receiving side. The time reference sending side sends a fixed-length time signal frame to the time reference receiving side, and the time reference receiving side analyzes and processes the above-mentioned signal frame after receiving the signal frame, and returns a response frame of the same length. The time delay of analysis and processing after receiving the signal frame is denoted as T _delay . The response frames of the same length include the time T _MT when the time reference transmitting side finishes sending the fixed-length signal frame and the time T _SR when the time reference receiving side finishes receiving the fixed-length time signal frame. The time when the time reference receiving side finishes sending the response frame of the same length is denoted as T _ST , and the time when the time reference transmitting side completes receiving the same response frame is denoted as T _MR . Therefore, the time delay for analysis and processing on the receiving side of the time reference can be expressed by the following formula:

T _delay =T _ST -T _SR

Therefore, the single-term transmission time of a fixed-length time signal frame can be expressed as follows:

T ₀ =(T _MR -T _MT -T _delay )/2

Among them, T ₀ is the single transmission time of the fixed-length time signal frame.

In this way, the optimal time source is determined through the corresponding relationship between the judgment result of the time quality of the timing signal by the clock unit and the preset priority. Calculate and compensate the transmission delay of the optimal time source, so as to use the optimal time source as the time signal sent to the timed device, improve the reliability of the time source received by the timed device, and thus improve the reliability of time synchronization. sex.

In some optional embodiments, the apparatus for time synchronization of substations may include:

The signal synchronization unit is configured to send the first timing signal and/or the second timing signal to other devices for time synchronization of the substation.

In the embodiment of the present disclosure, the signal synchronization unit sends the first timing signal and/or the second timing signal to other devices for substation time synchronization, so as to realize wireless transmission of the timing signal through the network, that is, to receive the wireless time reference signal. It is also possible that the device for time synchronization of the substation is provided with a corresponding interface, and the wired time reference signal is received through the interface.

Optionally, the clock unit may include a punctuality keeping subunit configured to make the device enter punctuality keeping when the device for substation time synchronization does not receive the first timing signal and/or the second timing signal. state. In the punctual keeping state, the device can determine the local time of the device according to the time of the previous timing state. And use the device local time as the optimal time source.

In practical applications, after the receiving unit receives the first timing signal and the second timing signal, the clock unit re-determines the optimal time source according to the received timing signal, and forwards the optimal time source through the output unit.

In this way, the timing signal received by the device for substation time synchronization can be sent to other substation time synchronization devices through the signal synchronization unit, so that other substation time synchronization devices can re-determine the optimal time source, and The re-determined optimal time source is forwarded to the corresponding device to improve the reliability of the time source received by the timed device, thereby improving the reliability of time synchronization.

With reference to FIG. 4 , an embodiment of the present disclosure provides a schematic diagram of a system for time synchronization of a substation, including:

a plurality of devices for substation time synchronization as in the above-mentioned embodiments, as the master clock 41; and

A plurality of slave clocks 42 , each of which is configured to receive the optimal time source sent by the master clock, and forward the optimal time source to the corresponding timed device 43 .

In the embodiment of the present disclosure, the slave clock 42 simultaneously receives the optimal time sources sent by multiple master clocks 41, and the time sources sent by different master clocks 41 have the same priority. In the case that all the time sources are valid, a signal with the highest time quality is selected as the optimal time source and forwarded to the corresponding time-served device 43 . In the case of the same time quality, a signal received first is selected as the optimal time source and forwarded to the corresponding timed device 43 .

In this way, a system for substation time synchronization is formed by the master clock and the slave clock. Different timing signals can be received by the master clock, and the determined optimal time source can be sent to the slave clock. The slave clock can determine the optimal time source sent by the master clock, and select one signal as the optimal time source to send to the timing device. The time signal improves the reliability of the time source received by the timing equipment, thereby improving the reliability of time synchronization.

Optionally, the system for substation time synchronization may include:

The time synchronization monitoring and management device is configured to monitor the time synchronization process of the slave node, and report alarm information when an abnormality occurs in the time synchronization process of the slave node;

Among them, the time synchronization process of the slave node is the process of forwarding the optimal time source from the master clock to the slave clock and the process of forwarding the optimal time source from the clock to the corresponding timed device.

In the embodiment of the present disclosure, the time synchronization monitoring and management apparatus is configured to detect the time synchronization process of the slave node. The slave node can be understood as the front-end gateway machine of the time synchronization monitoring and management device. The front-end gateway machine, as the time synchronization monitoring manager, realizes the monitoring and management of the time synchronization process through DL/T 476 or DL/T 634.5104. The monitoring and management of the time synchronization process by the slave node is to monitor the process of the master clock forwarding the optimal time source to the slave clock and the process of the slave clock forwarding the optimal time source to the corresponding timed device.

In practical applications, with reference to FIG. 5 , a schematic diagram of a time synchronization monitoring and management device of a system for substation time synchronization provided by an embodiment of the present disclosure includes: a time synchronization monitoring and management device, a slave node, a station control layer device, Spacer equipment.

The time synchronization monitoring and management device 51 is configured to monitor the time synchronization process of the slave node, and report alarm information when an abnormality occurs in the time synchronization process of the slave node.

The slave node 52 is configured to accept and send the monitoring clock information reported by the station control layer equipment and the bay layer equipment, and receive the monitoring clock request sent by the time synchronization monitoring management apparatus.

The monitoring clock information reported by the station control layer device 53 and the bay layer device 54 is the corresponding monitoring request result sent to the slave node transceiver unit of the time synchronization monitoring management device.

Optionally, the time synchronization monitoring and management device includes:

The slave node transceiver unit is configured to send a monitoring clock request to the slave node, and receive the corresponding monitoring request result sent from the slave node;

The alarm information reporting unit is configured to judge whether there is an abnormality according to the monitoring clock request and the corresponding monitoring request result, and report the alarm information in the case of abnormality.

In the embodiment of the present disclosure, the station control layer device 53 includes a clock device and a station control device. The clock device 53-1 includes the master clock and the slave clock in the above embodiment, and the station control device 53-2 includes the IED (Intelligent Electronic Device) installed in the substation which is not mentioned above. The bay layer equipment 54 includes a protection device 54-3, a fault filter 54-4, a PMU 54-1 (phasor measurement unit) device, and a measurement and control device 54-2. The measurement and control device 54-2 includes a process layer merging unit 54-5 and an intelligent terminal 54-6. It should be understood that the timed equipment includes a PMU 54-1, a measurement and control device 54-2, a protection device 54-3, a fault filter 54-4, and a station control device 53-2.

In practical applications, after receiving the monitoring clock request sent by the time synchronization monitoring and management device, the slave node sends the corresponding monitoring clock request to each time-served device. And receive the corresponding monitoring request results sent by each timing device. The received monitoring request result is regarded as the corresponding monitoring request result sent by the slave node.

Optionally, an alarm information reporting unit, including:

The internal clock time difference determination subunit is configured to determine the internal clock time difference according to the time stamp of the monitoring clock request and the time stamp of the corresponding monitoring request result;

In practical applications, with reference to FIG. 6 , a schematic diagram of the clock time difference of a system for substation time synchronization provided by an embodiment of the present disclosure. The slave node 52 sends a monitoring clock request to the timed device 43 , and the timed device 43 sends the corresponding monitoring request result to the slave node 52 after receiving the monitoring clock request. Wherein, T ₀ is the time stamp of sending the monitoring clock request from the node 52 to the timed device 43, T1 is the time stamp _of the timed device 43 receiving the monitoring clock request, and T2 is the time _stamp of the timed device 43 returning the monitoring request result , T3 is the time stamp _of receiving the monitoring request result from the node 52, and Δt is the time difference between the internal clocks.

Optionally, the internal clock time difference can be expressed as follows:

Δt=[(T ₃ -T ₂ )+(T ₀ -T ₁ )]/2

In practical applications, the calculation result of Δt represents the time difference between the internal clocks. If Δt is a positive number, it means that the internal clock is relatively advanced, and if Δt is a negative number, it means that the internal clock is relatively lagging behind.

The abnormality judging subunit is configured to judge that the corresponding process is abnormal when the time difference between the internal clocks reaches a preset threshold;

In the embodiment of the present disclosure, the preset threshold may be specifically set according to the actual working conditions, which is not specifically limited in this application, as long as it can reflect the time difference used for judging the internal clock.

The alarm reporting subunit is configured to report corresponding alarm information in the event of an abnormality.

In this way, the system for time synchronization of substations is formed by the master clock, the slave clock and the time synchronization monitoring and management device. The layered management for the station control layer equipment and the bay layer equipment can be realized by the time synchronization monitoring and management device. It also detects and manages the time synchronization process of the slave nodes, and reports corresponding alarm information when the internal clock time difference is abnormal. Therefore, the reliability of the time source received by the timing device improves the reliability of time synchronization.

Embodiments of the present disclosure provide a substation, including the above-mentioned system for substation time synchronization.

The technical solutions of the embodiments of the present disclosure may be embodied in the form of software products, and the computer software products are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: U disk, removable hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk, etc. A medium that can store program codes, and can also be a transient storage medium.

The foregoing description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples are only representative of possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Also, the terms used in this application are used to describe the embodiments only and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a" (a), "an" (an) and "the" (the) are intended to include the plural forms as well, unless the context clearly dictates otherwise. . Similarly, the term "and/or" as used in this application is meant to include any and all possible combinations of one or more of the associated listings. Additionally, as used in this application, the term "comprise" and its variations "comprises" and/or including and/or the like refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, reference may be made to the description of the method section for relevant parts.

Those skilled in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. Skilled artisans may use different methods for implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the disclosed embodiments. The skilled person can clearly understand that, for the convenience and brevity of the description, for the specific working process of the above-described systems, devices and units, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to apparatuses, devices, etc.) may be implemented in other ways. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units may only be a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be combined Either it can be integrated into another system, or some features can be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. This embodiment may be implemented by selecting some or all of the units according to actual needs. In addition, each functional unit in the embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, operations or steps corresponding to different blocks may also occur in different sequences than those disclosed in the descriptions, and sometimes there is no specific relationship between different operations or steps. order. For example, two consecutive operations or steps may, in fact, be performed substantially concurrently, or they may sometimes be performed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in special purpose hardware-based systems that perform the specified functions or actions, or special purpose hardware implemented in combination with computer instructions.

Claims (10)

1. An apparatus for substation time synchronization, comprising:

a receiving unit configured to receive a first timing signal and a second timing signal;

the clock unit is configured to determine an optimal time source according to the first time service signal and the second time service signal;

and the output unit is configured to forward the optimal time source.

2. The apparatus of claim 1, wherein the first time signal is a satellite time signal and the second time signal is a terrestrial time signal.

3. The apparatus of claim 1, wherein the clock unit comprises:

the time quality judging unit is configured to determine an optimal time source according to the time quality of the first time service signal and the second time service signal;

and the transmission delay compensation unit is configured to calculate and compensate the transmission delay of the optimal time source.

4. The apparatus of claim 3, wherein the time quality determination unit comprises:

a time quality determination subunit configured to determine time qualities of the first time service signal and the second time service signal according to time frame information of the first time service signal and the second time service signal;

and the time signal selection subunit is configured to determine an optimal time source according to the corresponding relation between the determined time quality and the preset priority.

5. The apparatus of claim 1, further comprising:

and the signal synchronization unit is configured to transmit the first time service signal and/or the second time service signal to other devices for time synchronization of the transformer substation.

6. A system for substation time synchronization, comprising:

a plurality of devices for substation time synchronization according to any of claims 1 to 5, as master clocks; and

and each slave clock is configured to receive the optimal time source sent by the master clock and forward the optimal time source to the corresponding timed device.

7. The system of claim 6, further comprising:

the time synchronization monitoring management device is configured to monitor the time synchronization process of the slave node and report alarm information under the condition that the time synchronization process of the slave node is abnormal;

the time synchronization process of the slave node is a process of forwarding the optimal time source to the slave clock by the master clock and a process of forwarding the optimal time source to the corresponding timed device by the slave clock.

8. The system of claim 7, wherein the time synchronization monitoring management device comprises:

a slave node transceiving unit configured to request a monitoring clock transmitted to a slave node and receive a corresponding monitoring request result transmitted from the slave node;

and the alarm information reporting unit is configured to judge whether an abnormality occurs according to the monitoring clock request and the corresponding monitoring request result, and report the alarm information under the condition of the abnormality.

9. The system according to claim 8, wherein said alarm information reporting unit comprises:

an internal clock time difference determining subunit configured to determine an internal clock time difference according to the time stamp of the monitoring clock request and the time stamp of the corresponding monitoring request result;

the abnormality judgment subunit is configured to judge that an abnormality occurs in the corresponding process under the condition that the internal clock time difference reaches a preset threshold;

and the alarm reporting subunit is configured to report corresponding alarm information under the condition of abnormity.

10. A substation, characterized in that it comprises a system for substation time synchronization according to any of claims 6-9.

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