GPS time service synchronization signal method and system for power transmission tower grounding measurement device

Abstract

The invention discloses a GPS time service synchronization signal method and system for a power transmission tower grounding measurement device, and relates to the field of power transmission tower grounding measurement, and the method comprises the steps: determining a target region, and dividing all measurement devices in the region into a plurality of groups; allocating a time service device for each group, constructing a synchronization subsystem, and setting a synchronization management device; establishing a superior and subordinate communication network, and initializing a synchronization subsystem; the time service device receives GPS pulse per second to obtain internal standard time, and sends the internal standard time to the synchronous management device; the time management module generates protocol time based on the received internal standard time and exchanges the protocol time in an upper network; and finally, synchronous time is generated and sent to the measuring device through the time issuing module. According to the invention, time service can be simultaneously carried out on a large number of measuring devices, the time service result is ensured to be accurate, and time service interruption caused by individual faults is avoided, so that all devices receive the same synchronization time, and the accuracy and reliability of time service are improved.

Description

Technical Field

[0001] The invention relates to the field of grounding measurement of a power transmission tower, and in particular to a GPS timing synchronization signal method and system for a grounding measurement device of a power transmission tower. Background Art

[0002] Transmission line towers include ground and underground parts. The ground part of the tower is exposed to the atmospheric environment, so its corrosion degree can be qualitatively evaluated by visual inspection. As for the underground part, it is buried underground and cannot be seen, and there is no monitoring device. Therefore, after the transmission line tower has been in operation for a period of time, the corrosion problem will be exposed, especially in coastal areas. The most intuitive manifestation of grounding grid corrosion is the increase in the resistance of the grounding grid branch, which will directly affect the performance of the transmission tower. Therefore, it is necessary to measure the state of the grounding grid in real time. However, the number of transmission towers in use is very large, and the number of corresponding grounding measurement devices is also very large. In order to accurately analyze and process the results of the grounding measurement device, it is necessary to make the grounding measurement device have the same time so that the measurement results can be summarized and analyzed based on time.

[0003] In the prior art, the time synchronization of different grounding measurement devices mainly relies on GPS synchronization timing technology, that is, by obtaining the standard time from the GPS positioning system or the Beidou positioning system as the internal time of the grounding measurement device. If each grounding measurement device independently obtains the standard time, when some grounding measurement devices are delayed in reception due to environmental factors, the time between different grounding measurement devices will be out of sync. Moreover, the electromagnetic environment near the transmission tower is complex, and reception delays are more likely to occur. In order to avoid this problem, many technical solutions in the prior art adopt a central timing method, that is, using a timing device to simultaneously time multiple grounding measurement devices, although it avoids the delay problem that may exist when the grounding measurement device independently obtains the standard time. However, the coverage of a timing device is limited, and the timing device itself may also have the problem of reception delay, and there will be differences between different timing devices. Therefore, for a large-scale transmission network, the timing result of this technology still has a large error, which is difficult to meet actual needs. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is: how to provide time for a large number of transmission tower grounding measurement devices at the same time.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a GPS timing synchronization signal method for a transmission tower grounding measurement device, comprising:

[0008] Determine the target area, take all the transmission tower grounding measurement devices in the target area as objects, and divide all the objects into multiple groups;

[0009] Assign a timing device to each group of objects, group all timing devices, set a synchronization management device for each group of timing devices, and build a synchronization subsystem;

[0010] Build upper and lower communication networks and initialize all synchronization subsystems;

[0011] The timing device receives the GPS second pulse based on the preset time collection period to obtain the internal standard time, and sends the internal standard time to the synchronization management device through the interactive module;

[0012] Generate the protocol time based on all the internal standard times received from the synchronization subsystem through the time management module, and exchange the protocol time in the upper communication network;

[0013] The time management module generates the synchronization time based on the exchange result of the protocol time and sends it to the timing management module;

[0014] The synchronization time is sent to the time distribution module through the timing management module;

[0015] The synchronization time is sent to the transmission tower grounding measurement device through the time sending module.

[0016] As a preferred solution of the GPS timing synchronization signal method for the transmission tower grounding measurement device, wherein:

[0017] The classification of all objects into multiple groups includes:

[0018] The distance between any two objects in the same group is lower than a preset distance threshold.

[0019] As a preferred solution of the GPS timing synchronization signal method for the transmission tower grounding measurement device, wherein:

[0020] The generating of the protocol time based on all the internal standard times received from the synchronization subsystem by the time management module comprises:

[0021] The reference time is calculated based on the internal communication error by the time management module: the time when the message containing the internal standard time sent by the timing device is received is used as the basis, and the internal communication error between the synchronization management device and the timing device is subtracted to obtain the reference time;

[0022] The time management module generates the agreed time based on the reference time and all internal standard times.

[0023] As a preferred solution of the GPS timing synchronization signal method for the transmission tower grounding measurement device, wherein:

[0024] The generating of the protocol time based on the reference time and all the internal standard times comprises:

[0025] When the difference between any two internal standard times is less than the preset time difference threshold, the time management module takes the average of all internal standard times as the agreement time;

[0026] When there is a certain internal standard time and the difference between at least two other internal standard times reaches the time difference threshold, the time management module discards the internal standard time and takes the average of the remaining internal standard times as the agreement time;

[0027] When the time management module discards the internal standard time, the timing device corresponding to the discarded internal standard time is marked as the first faulty device; if the first faulty device is in communication connection with the synchronization management device, the synchronization management device replaces the timing device connected to itself.

[0028] As a preferred solution of the GPS timing synchronization signal method for the transmission tower grounding measurement device, wherein:

[0029] The exchanging protocol time in the upper communication network includes:

[0030] When exchanging the protocol time, in addition to sending the protocol time, the synchronization management device also sends its own identity tag at the same time.

[0031] As a preferred solution of the GPS timing synchronization signal method for the transmission tower grounding measurement device, wherein:

[0032] The generating of synchronization time based on the exchange result of the protocol time and sending it to the timing management module comprises:

[0033] The time management module calculates the reference time based on the external communication error; after cleaning up the outliers of all protocol times, the average of the remaining protocol times is used as the synchronization time;

[0034] When the time management module successfully clears the outliers, the time management module sends the generated synchronization time to the synchronization management device corresponding to the outliers; when it is determined that a synchronization management device has a fault, it is identified as the second faulty device, and the remaining normal synchronization management devices send the generated synchronization time to the second faulty device.

[0035] As a preferred solution of the GPS timing synchronization signal method for the transmission tower grounding measurement device, wherein:

[0036] The sending of the synchronization time to the time sending module comprises:

[0037] The timing management module sends the synchronization time to a timing device connected to the synchronization management device. When sending it down, the value of the synchronization time is directly sent to the timing device; the timing device that receives the synchronization time transmits the synchronization time in the lower communication network; the process ends when all timing devices receive the synchronization time.

[0038] In a second aspect, an embodiment of the present invention provides a GPS timing synchronization signal system for a transmission tower grounding measurement device, comprising a plurality of synchronization subsystems, wherein the synchronization subsystem comprises a synchronization management device and a plurality of timing devices, wherein all synchronization management devices form an upper communication network based on a mesh topology structure, and all timing devices in a synchronization subsystem form a lower communication network based on a ring topology structure, wherein one timing device is communicatively connected with the synchronization management device;

[0039] The timing device includes a time acquisition module, an interaction module and a time delivery module, wherein the time acquisition module is used to obtain the internal standard time by receiving the GPS second pulse, the interaction module is used to communicate with the synchronization management device and other timing devices, and the time delivery module is used to send the synchronization time to multiple transmission tower grounding measurement devices;

[0040] The synchronization management device includes a time management module and a timing management module;

[0041] The time management module is used to obtain internal standard time from all timing devices in the synchronization subsystem, generate protocol time based on the internal standard time, transmit the protocol time in the upper communication network, and generate synchronization time based on the transmission result of the protocol time; the timing management module is used to send the synchronization time to the time sending module of one of the timing devices.

[0042] In a third aspect, an embodiment of the present invention provides a computing device, including:

[0043] Memory and processor;

[0044] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the one or more programs are executed by the one or more processors, the one or more processors implement the GPS timing synchronization signal method for the transmission tower grounding measurement device as described in any embodiment of the present invention.

[0045] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, can implement the GPS timing synchronization signal method for a transmission tower grounding measurement device.

[0046] The beneficial effects of the present invention are as follows: the present invention can cover a large number of transmission tower grounding measurement devices, that is, it can provide time for a large number of transmission tower grounding measurement devices at the same time; the present invention constructs a lower communication network and an upper communication network, and determines the final synchronization time through interaction based on the internal standard time obtained by each timing device, so as to avoid the difference in the internal standard time obtained by different timing devices and cause the accuracy of the timing result to decrease, and can ensure that the synchronization time received by all the transmission tower grounding measurement devices is the same, that is, the accuracy of the timing result can be fully guaranteed; in the present invention, each timing device can obtain the internal standard time by receiving the GPS second pulse, even if some timing devices cannot successfully obtain the internal standard time due to factors such as failure, the internal standard time obtained by other timing devices can be used to provide time for them, so as to avoid the interruption of the timing process of some transmission tower grounding measurement devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0048] Figure 1 It is an overall flow chart of the GPS timing synchronization signal method for a transmission tower grounding measurement device according to the first embodiment of the present invention;

[0049] Figure 2 It is a structural block diagram of the GPS timing synchronization signal system for the transmission tower grounding measurement device described in the first embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0051] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0053] Example 1

[0054] Reference Figure 1-Figure 2 , which is the first embodiment of the present invention, and which provides a GPS timing synchronization signal method for a transmission tower grounding measurement device, comprising:

[0055] S1: determine the target area, take all the transmission tower grounding measurement devices in the target area as objects, and divide all the objects into multiple groups;

[0056] In the embodiment of the present application, all objects are divided into multiple groups including:

[0057] The distance between any two objects in the same group is lower than a preset distance threshold.

[0058] It should be noted that because it is necessary to collect the internal interaction error between the two timing devices, and the internal interaction error is closely related to the distance between the two timing devices, the greater the distance between the two timing devices, the longer the communication process takes, and the communication link is more susceptible to interference from the surrounding environment. In addition, the internal interaction error is directly used in the transmission process of the synchronization time within the lower communication network. Therefore, it is necessary to reduce the internal interaction error as much as possible. Accordingly, the distance between the two timing devices cannot be too large.

[0059] S2: Allocate a timing device to each group of objects, group all the timing devices, set a synchronization management device for each group of timing devices, and build a synchronization subsystem.

[0060] S3: Build the upper communication network and the lower communication network, and initialize all synchronization subsystems.

[0061] Specifically, the upper communication network adopts a mesh topology structure, and the lower communication network adopts a ring topology structure.

[0062] S4: The timing device receives the GPS second pulse based on a preset time collection period to obtain the internal standard time, and sends the internal standard time to the synchronization management device through the interaction module.

[0063] Specifically, after the system is deployed, it is necessary to set a time collection cycle. All timing devices receive GPS second pulses according to the time collection cycle. The time collection cycle can be determined according to actual needs. The internal standard time is also sent based on the lower communication network. Specifically, according to the ring topology structure, the timing device aggregates the internal standard time it receives to a timing device connected to the synchronization management device, and then the timing device sends it to the synchronization management device. At the same time, the timing device also sends its own internal standard time. Therefore, the synchronization management device receives an array composed of multiple internal standard times. In the lower communication network, when the timing device sends the internal standard time, it only sends the internal standard time itself without making any modifications or adding any content.

[0064] S5: Generate the protocol time based on all the internal standard times received from the synchronization subsystem through the time management module, and exchange the protocol time in the upper communication network.

[0065] In an embodiment of the present application, generating a protocol time based on all internal standard times received from the synchronization subsystem by the time management module includes:

[0066] The reference time is calculated based on the internal communication error by the time management module: the time when the message containing the internal standard time sent by the timing device is received is used as the basis, and the internal communication error between the synchronization management device and the timing device is subtracted to obtain the reference time.

[0067] It should be noted that because it takes a certain amount of time for the internal standard time to be sent from the timing device to the synchronization management device, a certain error, namely the internal communication error, will occur. Therefore, after the synchronization management device receives the internal standard time sent by the timing device, the time management module takes the time when the message containing the internal standard time sent by the timing device is received as the basis, and after subtracting the internal communication error between the synchronization management device and the timing device, the reference time can be obtained. The reference time can be used to determine whether a timing device connected to the synchronization management device has a fault. Specifically, if the reference time calculated by the synchronization management device is significantly different from all the received internal standard times, it means that a timing device connected to the synchronization management device may have a communication fault, resulting in a significant increase in delay.

[0068] The time management module generates the agreed time based on the reference time and all internal standard times.

[0069] In the embodiment of the present application, generating the protocol time based on the reference time and all internal standard times includes:

[0070] When the difference between any two internal standard times is less than a preset time difference threshold, the time management module uses the average of all internal standard times as the protocol time.

[0071] It should be noted that, under ideal conditions, all timing devices will simultaneously receive GPS second pulses to obtain the same internal standard time. At this time, the average of all internal standard times can be used as the protocol time.

[0072] When there is a certain internal standard time and the difference between at least two other internal standard times reaches the time difference threshold, the time management module discards the internal standard time and takes the average of the remaining internal standard times as the protocol time.

[0073] It should be noted that if the difference between a certain reference time and other reference times exceeds the time difference threshold, it means that the timing device corresponding to the reference time may be faulty, and its time acquisition module may have a large delay in acquiring the GPS second pulse. At this time, the internal standard time corresponding to the faulty timing device needs to be discarded to avoid affecting the accuracy of the protocol time.

[0074] When the time management module discards the internal standard time, the timing device corresponding to the discarded internal standard time is marked as the first faulty device; if the first faulty device is in communication connection with the synchronization management device, the synchronization management device replaces the timing device connected to itself.

[0075] It should be noted that, because the timing device only sends the internal standard time without adding a tag when sending the internal standard time, this method can reduce the size of the data packet and reduce the delay caused by the internal interaction process, but it will make it impossible to determine the corresponding relationship between the discarded internal standard time and the timing device. Among all the timing devices in the synchronization subsystem, the timing device connected to the synchronization management device is the most important, because it needs to communicate directly with the synchronization management device to complete the transmission of the internal standard time and the error collection label, and the importance of other timing devices is lower than this timing device. Therefore, when a timing device is determined to be the first fault device, it is necessary to determine whether the first fault device is connected to the synchronization management device. The judgment of whether the first fault device is a timing device connected to the synchronization management device is based on the reference time, that is, when there is a large difference between the reference time and all internal standard times, the first fault device is connected to the synchronization management device. If the reference time differs greatly from only one of the discarded internal standard times, it means that one of the timing devices connected to the synchronization management device is fault-free, but other timing devices are faulty. In this case, there is no need to replace the connection between the synchronization management device and the timing device, and only corresponding processing is required in the subsequent timing process. The synchronization management device needs to have the ability to communicate with all timing devices, but only communicates with one of them in a normal state, that is, it is connected to only one timing device. When the timing device fails, the synchronization management device needs to establish a connection with other timing devices.

[0076] In an embodiment of the present application, exchanging protocol time in an upper communication network includes:

[0077] When exchanging the protocol time, in addition to sending the protocol time, the synchronization management device also sends its own identity tag at the same time.

[0078] S6: Generate the synchronization time based on the exchange result of the protocol time through the time management module, and send it to the timing management module.

[0079] In an embodiment of the present application, generating a synchronization time based on the exchange result of the protocol time and sending it to the timing management module includes:

[0080] The time management module calculates a reference time based on an external communication error.

[0081] Specifically, the upper communication network adopts a mesh topology structure, and a synchronization management device needs to exchange the protocol time generated by itself with all other synchronization management devices. Accordingly, each synchronization management device will receive multiple protocol times, and needs to calculate the reference time one by one based on the known external communication error. Specifically, the reference time is obtained by subtracting the external communication error from the moment of receiving the protocol time. The reference time corresponds to the protocol time, that is, the time management module of a synchronization management device will generate multiple reference times. Further, based on the difference between the reference time and the protocol time, it can be judged whether the synchronization management device corresponding to the reference time has a fault. If the difference between the reference time and the protocol time is too large, it means that the protocol time has a large delay during the sending process due to reasons such as communication link failure. Because the communication between the synchronization management devices is bidirectional, the faulty synchronization management device will judge that other normal synchronization management devices have faults, and other normal synchronization management devices can judge the faulty synchronization management device. It can be determined whether the synchronization management device is actually faulty based on the number of times the synchronization management device is judged to be faulty, and then the faulty synchronization management device is determined as the second faulty device.

[0082] After all protocol times are cleared of outliers, the average of the remaining protocol times is used as the synchronization time. Specifically, outliers are some protocol times that are significantly different from other protocol times among all protocol times received by a synchronization management device. The specific determination method is the same as the determination method for the internal standard time. After clearing outliers, the remaining protocol times have very small differences, and the average of all remaining protocol times can be used as the synchronization time. For synchronization management devices that have not failed, all remaining protocol times are the same, so the generated synchronization time is also the same, which achieves the purpose of generating the same synchronization time in different synchronization subsystems.

[0083] When the time management module successfully clears the outlier, the time management module sends the generated synchronization time to the synchronization management device corresponding to the outlier. When a synchronization management device is determined to be faulty, it is identified as the second faulty device, and the remaining normal synchronization management devices send the generated synchronization time to the second faulty device.

[0084] S7: Send the synchronization time to the time sending module through the timing management module.

[0085] In an embodiment of the present application, sending the synchronization time to the time delivery module includes:

[0086] The timing management module sends the synchronization time to a timing device connected to the synchronization management device. When sending it down, the value of the synchronization time is directly sent to the timing device; the timing device that receives the synchronization time transmits the synchronization time in the lower communication network; the process ends when all timing devices receive the synchronization time.

[0087] It should be noted that in the lower-level communication network, the synchronization time is still transmitted along the ring topology structure. Therefore, when the timing device receives the synchronization time, it has been delayed for a period of time. This lag is caused by internal communication errors and internal interaction errors. Therefore, when a timing device connected to the synchronization management device receives the synchronization time, it is necessary to first use the internal communication error to correct the synchronization time. After the correction, it uses the corrected synchronization time as its own time and sends the corrected synchronization time to the next timing device. The subsequent timing devices correct it again based on the internal interaction error and use it as their own time. More specifically, when the time sending device synchronizes the time at the bottom, it sends the synchronization time, internal communication error and all internal interaction errors to a timing device connected to the synchronization management device at the same time. Then, after receiving the synchronization time, the timing device updates the synchronization time based on the internal communication error between itself and the synchronization management device and completes its own timing process. After that, the internal communication error is deleted and the updated synchronization time and internal interaction error are forwarded to the next timing device. The received timing device updates the received synchronization time based on the internal interaction error between itself and the previous timing device and completes its own timing process, and so on. In this process, the synchronization management device only needs to send once, and the timing device only needs to receive and forward once, so the communication process is simple. In addition, because the internal interaction error and the internal communication error are continuously collected and updated, and the real-time performance is strong, the timing device updates the synchronization time based on the internal communication error and the internal interaction error, and the synchronization time finally accepted by different timing devices will not be different.

[0088] Because the acquisition of internal standard time is carried out according to the preset time collection cycle, correspondingly, the entire synchronous timing process is also determined based on the time collection cycle, therefore, each timing device should be able to receive the synchronous time according to the time collection cycle. If a timing device still does not receive the synchronous time after two time collection cycles, it means that the failure of the timing device may be more serious, resulting in a complete interruption of the communication process. At this time, the faulty timing device can be timed based on the internal standard time obtained by itself, or based on its own timing module. On this basis, the synchronization management device in the synchronization subsystem where the timing device is located will not be able to receive the internal standard time uploaded by each timing device due to the interruption of the lower communication network. At this time, the synchronization management device reorganizes the lower communication network, deletes the timing device that cannot communicate due to a serious fault from the ring topology structure, and establishes a connection between the two timing devices located before and after the seriously faulty timing device, completes the repair of the lower communication network, and facilitates the continuation of synchronous timing. Specifically, in the lower communication network, because a ring topology is adopted, each timing device has an identity tag arranged in order. Under normal conditions, the timing device sends internal standard time and synchronization time based on the order of the identity tag. When a timing device is disconnected, the synchronization management device sends a repair signal to a timing device connected to it. The target of the repair signal is the previous timing device of the faulty timing device, and the purpose is to change the target of the synchronization time of the internal standard time sent by the timing device, so that the internal standard time and synchronization time sent by the timing device can skip the faulty timing device. Correspondingly, the repair signal may include a target tag, and the target tag is the identity tag of the next timing device after the faulty timing device. Further, when the seriously faulty timing device is repaired, it sends a status recovery message to the synchronization management device, and the synchronization management device re-adds it to the lower communication network. The repaired timing device can be re-added to the lower communication network in the same way as sending the repair signal.

[0089] S8: Send the synchronization time to the transmission tower grounding measurement device through the time sending module.

[0090] It should be noted that the above method can ensure that in multiple synchronization subsystems, the synchronization time used by all subsystems is the same, and within the synchronization subsystem, although there is a lag in the synchronization time received by each timing device, it can be corrected based on internal communication errors and internal interaction errors, and ultimately the time of each timing device after updating is also the same.

[0091] The above is a schematic scheme of the GPS timing synchronization signal method for the transmission tower grounding measurement device of this embodiment. It should be noted that the technical scheme of the GPS timing synchronization signal system for the transmission tower grounding measurement device and the technical scheme of the GPS timing synchronization signal method for the transmission tower grounding measurement device mentioned above belong to the same concept. The details of the technical scheme of the GPS timing synchronization signal system for the transmission tower grounding measurement device in this embodiment that are not described in detail can all be referred to the description of the technical scheme of the GPS timing synchronization signal method for the transmission tower grounding measurement device mentioned above.

[0092] The GPS timing synchronization signal system for the transmission tower grounding measurement device in this embodiment includes multiple synchronization subsystems, the synchronization subsystem includes a synchronization management device and multiple timing devices, all synchronization management devices form an upper communication network based on a mesh topology structure, all timing devices in a synchronization subsystem form a lower communication network based on a ring topology structure, and one timing device is communicatively connected with the synchronization management device;

[0093] The timing device includes a time acquisition module, an interaction module and a time delivery module, wherein the time acquisition module is used to obtain the internal standard time by receiving the GPS second pulse, the interaction module is used to communicate with the synchronization management device and other timing devices, and the time delivery module is used to send the synchronization time to multiple transmission tower grounding measurement devices;

[0094] The synchronization management device includes a time management module and a timing management module;

[0095] The time management module is used to obtain the internal standard time from all timing devices in the synchronization subsystem, generate the protocol time based on the internal standard time, transmit the protocol time in the upper communication network, and generate the synchronization time based on the transmission result of the protocol time;

[0096] The timing management module is used to send the synchronization time to the time sending module of one of the timing devices.

[0097] Specifically, when the present invention is used, multiple transmission tower grounding measurement devices that are close to each other are grouped together, and a timing device is assigned to one group of transmission tower grounding measurement devices, so that one timing device simultaneously provides time for multiple transmission tower grounding measurement devices. Furthermore, multiple timing devices are grouped together again, and a synchronization management device is assigned to multiple timing devices in the same group to construct a synchronization subsystem, and a lower-level communication network is constructed, and one of the timing devices is kept connected to the synchronization management device. Furthermore, multiple synchronization subsystems are connected to the synchronization management device through the communication connection of the synchronization management device to construct an upper-level communication network.

[0098] After being put into use, the timing device first independently receives the GPS second pulse through the time acquisition module to obtain the internal standard time, and then sends the internal standard time to the synchronization management device through the interaction module. After obtaining the internal standard time sent by all timing devices in the synchronization subsystem, the synchronization management device generates the protocol time based on all the internal standard times. After that, the synchronization management device interacts with the protocol time in the upper communication network, and then the synchronization management device generates the synchronization time based on the protocol time obtained by the interaction and the protocol time it holds. Because the protocol time obtained by all synchronization management devices in the interaction process is the same, the synchronization time obtained based on the same generation method is also the same, which ensures that the synchronization time generated in each synchronization subsystem is the same. Finally, the synchronization management device sends the synchronization time to all timing devices in the synchronization subsystem, and the timing device sends the synchronization time to all transmission tower grounding measurement devices connected to itself through the time sending module to complete the time synchronization.

[0099] It should be noted that the present invention can cover a large number of transmission tower grounding measurement devices, that is, it can provide time for a large number of transmission tower grounding measurement devices at the same time; the present invention constructs a lower communication network and an upper communication network, and determines the final synchronization time through interaction based on the internal standard time obtained by each timing device, which can avoid the difference in the internal standard time obtained by different timing devices and cause the accuracy of the timing result to decrease, and can ensure that the synchronization time received by all transmission tower grounding measurement devices is the same, that is, the accuracy of the timing result can be fully guaranteed; in the present invention, each timing device can obtain the internal standard time by receiving the GPS second pulse, even if some timing devices cannot successfully obtain the internal standard time due to factors such as failures, the internal standard time obtained by other timing devices can be used to provide time for them, which can avoid the interruption of the timing process of some transmission tower grounding measurement devices.

[0100] Considering that some errors will be generated in the process of several signal transmissions, these processes mainly include the process of sending the internal standard time to the synchronization management device, the process of the protocol time interacting in the upper communication network, and the process of sending the synchronization time to the timing device, in order to ensure the accuracy of the final timing result, the present invention also sets up an error management module to calculate the errors generated in each process. Specifically, the synchronization management device also includes an error management module, which is used to generate and recover error collection tags according to a preset internal error collection cycle and collect external communication errors between two synchronization management devices according to a preset external error collection cycle. The error collection tag is used to determine the internal communication error between the error management device and one of the timing devices. The error generated by the signal transmission between the timing device and the synchronization management device is determined by the error management module by generating and recovering the error collection tag. Specifically, the error management module first generates an error collection tag, which includes a time tag, and then sends the error collection tag to a timing device connected to itself. After receiving the error collection tag, the timing device forwards the error collection tag to the next timing device, and expands the error collection tag while forwarding, specifically adding a time tag, the newly added time tag is the sending time when forwarding, and so on, until a timing device connected to the synchronization management device receives the error collection tag again, and sends the error collection tag back to the synchronization management device. Because the lower communication network adopts a ring topology structure, the error collection tag is also forwarded one by one when it is transmitted in the lower communication network. Therefore, in the process of generating and recovering the error collection tag, the synchronization management device only needs to perform a sending and receiving process with one timing device, and each timing device also only needs to perform a sending and receiving process once. The synchronization management device does not need to communicate with each timing device, and the entire communication process is simpler. Furthermore, after the synchronization management device recovers the error collection tag, it parses the error collection tag, extracts all the time tags from it, and then calculates the error generated by the error collection tag during transmission based on the difference between two adjacent time tags. The error generated during transmission between the synchronization management device and the timing device is an internal communication error, and the error generated during transmission between the two timing devices is an internal synchronization error. It should be noted that after receiving the error collection tag, the timing device only needs to add a time tag to forward it, and the error generated during this period can be ignored.

[0101] On the other hand, the synchronization management devices interact with each other based on the external error collection cycle, and determine the external communication error between each other during the interaction process. Any two synchronization management devices have an external communication error. The method for determining the external communication error can also be determined based on the difference between the sending time and the receiving time.

[0102] Because the timing device needs to add a time mark in the error collection tag when forwarding the error collection tag, the timing device needs to have a timing function. Accordingly, the timing device also includes a timing module, which is used to generate its own time, and when the time sending module receives the synchronization time, the timing module updates the own time based on the synchronization time. In addition to being used to add a time mark in the error collection tag, the own time can also be used as a backup. Specifically, if a timing device cannot receive the GPS second pulse or the synchronization time sent by other timing devices due to a fault or other reasons, it can maintain normal operation based on its own time. Because the own time will be updated according to the synchronization time every time the synchronization time is received, although there is a timing error in the timing module, there will not be a huge difference with other normal timing devices in a short time. Therefore, the timing device can still operate normally for a period of time after the fault, providing more ample time for maintenance operations.

[0103] This embodiment further provides a computing device, which is applicable to the case of a GPS timing synchronization signal method for a transmission tower grounding measurement device, including:

[0104] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the GPS timing synchronization signal method for the transmission tower grounding measurement device as proposed in the above embodiment.

[0105] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the GPS timing synchronization signal method for a transmission tower grounding measurement device as proposed in the above embodiment is implemented.

[0106] The storage medium proposed in this embodiment and the GPS timing synchronization signal method for the transmission tower grounding measurement device proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0107] Example 2

[0108] Referring to Tables 1 to 3, an embodiment of the present invention provides a GPS timing synchronization signal method for a transmission tower grounding measurement device. In order to verify the beneficial effects of the present invention, a scientific demonstration is carried out through simulation experiments.

[0109] Step 1: Determine the target area and object grouping

[0110] 1. Determine the transmission tower areas within the substation that need to be monitored.

[0111] 2. The geographical location of all ground measurement devices in the area is measured, and the results are shown in Table 1:

[0112] Table 1 Related information of grounding measurement device

[0113] Transmission tower number Coordinates (X,Y) Timing device connection distance (m) T1 (100,200) — T2 (150,210) 54 T3 (180,250) 25 T4 (300,300) 130 T5 (350,320) 75

[0114] 3. According to the preset distance threshold (50m), T1, T2, and T3 are grouped into one group (Group A), and T4 and T5 are grouped into one group (Group B).

[0115] Step 2: Timing device allocation

[0116] 1. Assign a timing device to each group of objects:

[0117] Group A: T1 device (timing device A1), T2 device (timing device A2), T3 device (timing device A3)

[0118] Group B: T4 device (timing device B1), T5 device (timing device B2)

[0119] Step 3: Build a communication network

[0120] 1. Establish an upper communication network (mesh topology) and a lower communication network (ring topology).

[0121] 2. Initialize all synchronization subsystems and ensure that all timing devices are online.

[0122] Step 4: Receive GPS pulses and calculate internal standard time

[0123] 1. Set the time acquisition period to 10 seconds.

[0124] 2. All timing devices receive GPS signals periodically and record internal standard time.

[0125] Step 5: Generate protocol time

[0126] 1. Internal standard time received by timing devices A1, A2, A3:

[0127] A1:1598941200

[0128] A2:1598941200

[0129] A3:1598941201

[0130] Generate agreement time through the time management module:

[0131] Since the difference between the internal standard times is less than 5ms, the protocol time = (1598941200 + 1598941200 + 1598941201) / 3 = 1598941200

[0132] Step 6: Exchange protocol time and generate synchronization time

[0133] 1. Through the time management module, exchange the agreement time and generate the synchronization time.

[0134] 2. Assume that the mean value of the protocol time is 1598941200, and it is passed to the lower network after cleaning the outliers.

[0135] Step 7: Send the synchronized time to the connected timing device

[0136] 1. Send the synchronization time to the timing device connected to the synchronization management device.

[0137] 2. The synchronization time received by timing device A1 is 1598941200, after which it updates its own time and passes it to the next device.

[0138] Step 8: Send the time to the ground measurement device

[0139] 1. After completing time synchronization, the time records of each measuring device are shown in Table 2:

[0140] Table 2 Time records of each measuring device

[0141]

[0142]

[0143] During the simulation, the time of all transmission tower grounding measurement devices was successfully synchronized, with a consistency error of less than 5ms and good data stability. From Table 3, we can observe the real-time changes of time synchronization of different timing devices:

[0144] Table 3 Time synchronization of timing device

[0145]

[0146] Through this simulation example, it is proved that this method can effectively realize the management of synchronization time in multiple transmission tower grounding measurement devices.

[0147] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A GPS timing synchronization signal method for a transmission tower grounding measurement device, characterized in that: include: Determine the target area, take all the transmission tower grounding measurement devices in the target area as objects, and divide all the objects into multiple groups; Assign a timing device to each group of objects, group all timing devices, set a synchronization management device for each group of timing devices, and build a synchronization subsystem; Build upper and lower communication networks and initialize all synchronization subsystems; The timing device receives the GPS second pulse based on the preset time collection period to obtain the internal standard time, and sends the internal standard time to the synchronization management device through the interactive module; Generate the protocol time based on all the internal standard times received from the synchronization subsystem through the time management module, and exchange the protocol time in the upper communication network; The time management module generates the synchronization time based on the exchange result of the protocol time and sends it to the timing management module; The synchronization time is sent to the time distribution module through the timing management module; The synchronization time is sent to the transmission tower grounding measurement device through the time sending module.

2. The GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in claim 1, characterized in that: The classification of all objects into multiple groups includes: The distance between any two objects in the same group is lower than a preset distance threshold.

3. The GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in claim 2, characterized in that: The generating of the protocol time based on all the internal standard times received from the synchronization subsystem by the time management module comprises: The reference time is calculated based on the internal communication error by the time management module: the time when the message containing the internal standard time sent by the timing device is received is used as the basis, and the internal communication error between the synchronization management device and the timing device is subtracted to obtain the reference time; The time management module generates the agreed time based on the reference time and all internal standard times.

4. The GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in claim 3, characterized in that: The generating of the protocol time based on the reference time and all the internal standard times comprises: When the difference between any two internal standard times is less than the preset time difference threshold, the time management module takes the average of all internal standard times as the agreement time; When there is a certain internal standard time and the difference between at least two other internal standard times reaches the time difference threshold, the time management module discards the internal standard time and takes the average of the remaining internal standard times as the agreement time; When the time management module discards the internal standard time, the timing device corresponding to the discarded internal standard time is marked as the first faulty device; if the first faulty device is in communication connection with the synchronization management device, the synchronization management device replaces the timing device connected to itself.

5. The GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in claim 4, characterized in that: The exchanging protocol time in the upper communication network includes: When exchanging the protocol time, in addition to sending the protocol time, the synchronization management device also sends its own identity tag at the same time.

6. The GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in claim 5, characterized in that: The generating of synchronization time based on the exchange result of the protocol time and sending it to the timing management module comprises: The time management module calculates the reference time based on the external communication error; after cleaning up all the protocol times, the average of the remaining protocol times is used as the synchronization time; When the time management module successfully clears the outliers, the time management module sends the generated synchronization time to the synchronization management device corresponding to the outliers; when it is determined that a synchronization management device has a fault, it is identified as the second faulty device, and the remaining normal synchronization management devices send the generated synchronization time to the second faulty device.

7. The GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in claim 6, characterized in that: The sending of the synchronization time to the time sending module comprises: The timing management module sends the synchronization time to a timing device connected to the synchronization management device. When sending it down, the value of the synchronization time is directly sent to the timing device; the timing device that receives the synchronization time transmits the synchronization time in the lower communication network; the process ends when all timing devices receive the synchronization time.

8. A system using the GPS timing synchronization signal method for a transmission tower grounding measurement device as claimed in any one of claims 1 to 7, characterized in that: It includes a plurality of synchronization subsystems, wherein the synchronization subsystem includes a synchronization management device and a plurality of timing devices, all synchronization management devices form an upper communication network based on a mesh topology structure, and all timing devices in one synchronization subsystem form a lower communication network based on a ring topology structure, wherein one timing device is in communication connection with the synchronization management device; The timing device includes a time acquisition module, an interaction module and a time delivery module, wherein the time acquisition module is used to obtain the internal standard time by receiving the GPS second pulse, the interaction module is used to communicate with the synchronization management device and other timing devices, and the time delivery module is used to send the synchronization time to multiple transmission tower grounding measurement devices; The synchronization management device includes a time management module and a timing management module; The time management module is used to obtain internal standard time from all timing devices in the synchronization subsystem, generate protocol time based on the internal standard time, transmit the protocol time in the upper communication network, and generate synchronization time based on the transmission result of the protocol time; The timing management module is used to send the synchronization time to the time sending module of one of the timing devices.

9. A computing device comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the GPS timing synchronization signal method for a transmission tower grounding measurement device as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the GPS timing synchronization signal method for a transmission tower grounding measurement device as described in any one of claims 1 to 7.

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