KR20230121450A - Phase measurement and correction system on distribution power line - Google Patents

Abstract

A measurement and correction system on a distribution line according to various embodiments of the present disclosure includes a substation (S/S, substation); A plurality of distribution line equipment installed on the distribution line drawn out from the substation; and a plurality of FRTUs respectively connected to the plurality of distribution line devices, wherein the plurality of FRTUs establish a wireless communication connection with each other, one of the plurality of FRTUs is set as a reference device, and at least one of the other FRTUs is received device, the reference device measures a first measurement phase value using voltage and current on a connected distribution line device, transmits the first measurement phase value to the receiving device, and the receiving device measures the first measurement phase value using the connected distribution line device. Phase value when it is determined that there is an error by measuring the second measured phase value using the voltage and current on the furnace equipment and comparing the received first measured phase value with the measured second measured phase value can be corrected. Various other embodiments are possible.

Description

Measurement and correction system on distribution lines {PHASE MEASUREMENT AND CORRECTION SYSTEM ON DISTRIBUTION POWER LINE}

The present disclosure relates to a metering and correction system on a distribution line.

Currently, the composition of domestic distribution lines is supplying three-phase power in the form of dendritic power supply from the point of distribution substation (S/S, Substation) to the end-side connected equipment, and the connection of the load is in the middle of the line is arbitrarily configured. Therefore, consistent arrangement of power lines (phase, phase) is not made in domestic distribution lines from the power supply substation to the terminal connection point according to site construction conditions. In particular, in the configuration of a three-phase line, it is characterized by inconsistent progress according to site conditions in a state in which only contact between phases is suppressed in a connected device.

On the other hand, in the case of FRTU (Feeder Remote Terminal Unit), which is a field control and measuring device of domestic distribution line automation system (DAS), it has GPS or software-type high-precision time synchronization technology and real-time communication function between devices. . In addition, the measurement of distribution line voltage and current is performed by the FRTU (Feeder Remote Terminal Unit) of the power control device arranged along the line, but the information measured by independent measurement of each device and continuous change of each phase It is uncertain whether is the actual information of the corresponding phase.

In other words, current domestic distribution lines face problems such as load imbalance problems and difficulties in identifying actual faults in case of line failure, resulting in material and human damage such as increased line loss and delayed recovery.

The present disclosure intends to propose a distribution line phase measurement and correction system capable of automatically matching and setting the measurement phases of other distributed devices distributed on the same line based on the substation lead-out device.

The technical problem to be achieved in this document is not limited to the above-described technical problem, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. .

A measurement and correction system on a distribution line according to various embodiments of the present disclosure includes a substation (S/S, substation); A plurality of distribution line equipment installed on the distribution line drawn out from the substation; and a plurality of FRTUs respectively connected to the plurality of distribution line devices, wherein the plurality of FRTUs establish a wireless communication connection with each other, one of the plurality of FRTUs is set as a reference device, and at least one of the other FRTUs is received device, the reference device measures a first measurement phase value using voltage and current on a connected distribution line device, transmits the first measurement phase value to the receiving device, and the receiving device measures the first measurement phase value using the connected distribution line device. Phase value when it is determined that there is an error by measuring the second measured phase value using the voltage and current on the furnace equipment and comparing the received first measured phase value with the measured second measured phase value can be corrected. Various other embodiments are possible.

According to various embodiments of the present disclosure, a phase measurement error according to an actual line configuration can be detected, corrected and applied to an original phase, and a consistent measurement standard can be shared between measuring instruments of the same distribution line.

It is important to compare the phase values of the FRTU devices included in the system according to various embodiments of the present disclosure, and if the system time for measuring the phase value is not accurately synchronized, an error may occur in checking and correcting the phase error. there is. Therefore, the present disclosure can accurately synchronize system time between FRTU devices based on a Time-Sensitive Network (TSN).

In addition, according to various embodiments of the present disclosure, power loss can be reduced by suppressing load imbalance of distribution lines in normal times, and a stable policy can be established even in conjunction with distributed power generation such as solar power generation. In addition, even in the event of a distribution line accident such as short circuit or ground fault, stable fault analysis is possible with unified fault detection and measurement from the power source to the accident point. time can be shortened.

Effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is an environment diagram of a measurement and correction system on a distribution line according to various embodiments of the present disclosure.
2 is a block diagram of an FRTU according to various embodiments of the present disclosure.
3 illustrates an example of signaling between multiple FRTUs according to various embodiments.
4 illustrates an example of FRTUs as reference devices and receiver devices in a measurement and correction system on a distribution line according to various embodiments of the present disclosure.
FIG. 5 illustrates an example of signaling between a plurality of FRTUs according to the embodiments shown in FIG. 4 .
6 illustrates another example of FRTUs as reference devices and receiver devices in a measurement and correction system on a distribution line according to various embodiments of the present disclosure.

Hereinafter, with reference to the accompanying drawings, embodiments and embodiments of the present disclosure will be described in detail so that those skilled in the art can easily practice them. However, this disclosure may be embodied in many different forms and is not limited to the embodiments and examples set forth herein.

Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only, and may be modified and implemented in various forms. Therefore, the embodiments are not limited to the specific disclosed form, and the scope of the present specification includes changes, equivalents, or substitutes included in the technical spirit.

Although terms such as first or second may be used to describe various components, such terms should only be construed for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element.

It should be understood that when an element is referred to as being “connected” to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, but one or more other features or numbers, It should be understood that the presence or addition of steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this specification, it should not be interpreted in an ideal or excessively formal meaning. don't

Since devices (automatic switchgear and reclosers, etc.) installed on distribution lines are operated in a place where high voltage current flows, it is not easy to check and check whether the functions are properly operated after installation. Among the many functions of a device, it is the most difficult to ensure that the voltage and current sensors maintain proper accuracy and characteristics. However, since voltage and current measurement values for distribution lines are the most basic and important information in operation of distribution lines, basic performance must be maintained through management and inspection thereof. Accordingly, a distribution automation system (DAS) was introduced that can remotely manage and inspect distribution lines, check faulty sections, and control switches on the lines. When a random failure occurs in the distribution system, the failure handling procedure consists of failure determination, failure section determination, failure section isolation, circuit breaker (CB) or recloser re-insertion, failure section recovery, and system restoration in the order. These failure handling procedures can be performed sequentially by the DAS. DAS is composed of FRTU (Feeder Remote Terminal Unit) attached to the central control unit, automatic switch and recloser.

1 is an environment diagram of a measurement and correction system on a distribution line according to various embodiments of the present disclosure. Referring to FIG. 1, the measurement and correction system 100 on the distribution line is a substation 110 (S/S, substation), an automatic switch or recloser installed on the distribution line 111 drawn out from the substation 110. It may include a device 120 for a distribution line such as. The distribution line device 120 is installed at the upper end of the utility pole 121, and the FRTU 130 may be installed at the lower end of the utility pole 121 to control it.

Each of the plurality of FRTUs 130 or the DAS 140 may execute communication through the network 101 . Network 101 may be any one or more types of data communication networks, such as LAN, WAN, Internet, telephone network, cable network, peer-to-peer network, mesh network, and the like.

2 is a block diagram of an FRTU according to various embodiments of the present disclosure. Referring to FIG. 2 , the FRTU 130 may include a calculation unit 210, a voltage and current measurement unit 220, a time detection unit 230, a time synchronization unit 240, and a linkage communication unit 250.

In various embodiments, the calculation unit 210 may receive measurement values of the three-phase voltage and current signals of the multi-circuit measured from the voltage and current measurement unit 220 and determine a phase value to be corrected using the measured values. For example, the calculation unit 210 may measure the 3-phase voltage and current signals of the voltage and current measurement unit 220 based on the reference time confirmed by the time detection unit 230 and/or the time synchronization unit 240. . The calculation unit 210 may receive measurement values of other FRTUs and compare them with the measurement values of the voltage current measurement unit 220 . The calculation unit 210 may determine whether the FRTU 130 or other FRTUs are out of order by comparing the measured values of the distribution line device in which the FRTU 130 is installed with the measured values of other devices. The calculation unit 210 may determine a phase value to be corrected by comparing measurement values of the present distribution line device with measurement values of other devices.

The arithmetic unit 210 may include at least one processor 211 and at least one memory 212 . The processor 211 may include any combination of CPU, graphical processing units (GPUs), single core processors, multi-core processors, application specific integrated circuits (ASICs), and the like. At least one processor 211 may be implemented in software and/or firmware in addition to hardware implementation. A software or firmware implementation of processor 211 may include computer- or machine-executable instructions written in any suitable programming language to perform the various functions described above. A software implementation of processor 211 may be stored in whole or in part in memory 112 .

The memory 212 may store programs of instructions that may be loaded and executed on the processor 211 and data generated during execution of these programs. Examples of programs and data stored on the memory 212 include an operating system that controls the operation of hardware and software resources available to the FRTU 130, and hardware devices such as other FRTUs 130 or DAS 140 that interact with each other. It may include drivers to operate, communication protocols to send and receive data to and from the network 101 and other hardware devices, and additional software applications. Memory 212 may be volatile (such as RAM) or non-volatile (such as ROM or flash memory).

In various embodiments, the voltage and current measuring unit 220 is a voltage sensor (PT) installed on each phase at both ends of a distribution line device (eg, 120 in FIG. 1) installed in the distribution line and one side of the distribution line device. It may include a current sensor (CT) installed on each phase of the stage. The three-phase voltage and three-phase current signals provided from the voltage sensor installed at both ends of the equipment for distribution lines and the current sensor installed at one end may be transmitted to the voltage and current measuring unit 220 . In one embodiment, the three-phase voltage and three-phase current signals from the voltage sensor installed on both ends of the switch and the current sensor installed on one end pass through a surge protector (not shown) configured to protect the circuit from surge, and then the voltage It may be transmitted to the current measuring unit 220 .

The voltage and current measurement unit 220 may measure the three-phase voltage and current signals based on the reference time determined by the time detection unit 230 and/or the time synchronization unit 240 . In other words, the voltage and current measurement unit 220 may measure the three-phase voltage and current signals according to the system time synchronized with the reference time by the time synchronization unit 240 .

In various embodiments, the calculation unit 210 may correct the time corresponding to the measured value of the voltage and current measuring unit 220 to the absolute time. The voltage/current measurement unit 220 may measure current, voltage phase, state, and current direction from the measured signal, and may store these measured values in the memory 212 .

In various embodiments, the time detector 230 may receive time information on the reference time and calculate a time error between the system time of the FRTU 130 and the reference time. For example, the time detection unit 230 may calculate a time error up to nanosecond units based on a time error calculation method provided by the IEEE 1588 PTP (Precision Time Protocol) standard. The time detection unit 230 may transmit the calculated time error to the system time synchronization unit 240 .

The time synchronization unit 240 estimates an error factor between the system time and the reference time according to the time error calculated by the time detection unit 230 and synchronizes the system time with the reference time according to the estimated error factor. To this end, the time synchronization unit 240 may estimate an error factor between the system time and the reference time according to the time error calculated by the time detection unit 230 . For example, the time synchronization unit 240 models a representative time synchronization error factor acting on the FRTU 130 based on an AR (Auto-Regression) model and converts the modeling result into a Recursive Least Square (RLS) based adaptation algorithm. By estimating, in the precise time synchronization system according to the IEEE 1588 PTP standard, error factors affecting the time synchronization system of the terminal can be estimated using a probability signal model.

Meanwhile, error factors between the system time of the FRTU 130 and the reference time include clock drift, clock offset, and network disturbance. Clock drift is a minute vibration phenomenon of a clock oscillator caused by heat generation of terminal hardware. This clock drift is a physical phenomenon such as vibration and may cause a slight error in the number of clocks generated per second. The clock offset is a clock frequency error between the FRTU 130 and the reference time. Since there is a unique clock frequency for each hardware, a unique clock frequency error may occur between the terminal and the reference time. Network disturbance is network noise caused by network load. Since the time synchronization method based on the IEEE 1588 PTP standard is based on Ethernet communication, it is inevitably affected by network noise.

In various embodiments, the time synchronizer 240 may include a disturbance estimator, a disturbance canceller, a proportional controller, and a clock rate calculator (not shown) in order to estimate an error factor. The time synchronizer 240 may remove an error factor estimated through the disturbance estimator. For example, the time synchronizer 240 directly removes and compensates for an error factor caused by a disturbance using a model estimation value obtained through a disturbance estimator in a feedback loop for frequency tuning. In this case, the time synchronizer 240 may subtract the estimated value from the clock tuning feedback loop according to the IEEE 1588 PTP standard to remove the cause of the error. The time synchronizer 240 may generate a frequency correction value by proportionally controlling the residual signal from which the error has been removed by the disturbance canceller and the reference time through a proportional controller.

According to various embodiments, the time synchronization unit 240 synchronizes the system time with the reference time, and may synchronize the system time with the reference time. The time synchronizer 240 may include a clock oscillator 241 and a time compensator 242 . The clock oscillator 241 controls the system time of the hardware during hardware configuration of the terminal, and adjusts the clock frequency according to the frequency correction value as described above. The time corrector 242 may manage the system time of software of the software of the FRTU 130 . The time corrector 242 may correct the system time by receiving an error between the system time and the reference time as feedback from the time detector 230 . Also, the time corrector 242 may continuously update the system time based on the clock frequency of the clock oscillator 241 . That is, the time synchronization unit 240 may generate a frequency correction value and input it to a clock rate calculator when performing time synchronization based on the IEEE 1588 PTP standard. The time synchronizer 240 may feedback-control the time error calculator according to the frequency correction value generated by the proportional controller through the clock rate calculator. That is, the time synchronization unit 240 controls the clock oscillator 241 and may receive a frequency correction value from the proportional controller and correct the clock frequency of the clock oscillator 241 according to the frequency correction value.

In the above-described embodiment, the time synchronizer 240 has been described as a reference time according to PTP, but in various embodiments, the reference time is NTP (Network Time Protocol) timeline, GPS timeline, NPT (Now Playing) Time) and/or Coordinated Universal Time (UTC). Accordingly, at least some components of the time detector 230 and the time synchronizer 240 may be added or changed according to a level of technology apparent to those skilled in the art. there is.

The linkage communication unit 250 may support establishment of a wired or wireless communication channel between the DAS 140 or other FRTUs 130 and communication through the established communication channel. The linkage communication unit 250 may include one or more communication processors supporting wired communication or wireless communication. According to one embodiment, the linkage communication unit 250 is a wireless communication module (eg, a cellular communication module, a short-distance wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (#94) (eg, LAN (local area network) communication module or power line communication module), and using the corresponding communication module among them, a local area network (eg Bluetooth, WiFi direct or IrDA (infrared data association)) or a long-distance communication network (eg : communicate with other FRTUs over telecommunication networks such as cellular networks, the Internet, or computer networks (eg LAN or WAN). For example, communication between the DAS 140 or other FRTUs 130 included in the system 100 is configured by applying a commercial wireless method (3rd, 4th, or 5th generation mobile communication network) so that there is no distance limitation. . However, the wireless communication method may have various configurations according to field conditions, and devices and systems may be configured to have flexible adaptability to such communication environments.

In various embodiments, a communication method between the DAS 140 or other FRTUs 130 included in the system 100 (eg, a bus, general purpose input/output (GPIO), serial peripheral interface (SPI), or MIPI) They are connected to each other through (mobile industry processor interface) and can exchange signals (eg, commands or data) with each other.

3 illustrates an example of signaling between multiple FRTUs according to various embodiments. This signaling may be caused by the FRTU 130 shown in FIGS. 1 and 2 . Referring to FIG. 3 , a process in which an FRTU synchronizes a time with an adjacent FRTU and corrects a phase error in various embodiments of the present disclosure will be described.

Referring to FIG. 3 , in operation 301, a first FRTU 310 may be set as a reference device, and a second FRTU 320 may be set as a receiver device. The first FRTU 310 may be a FRTU device connected to a distribution line device (eg, distribution line device 120 of FIG. 1 ) closest to a substation (eg, the substation 110 of FIG. 1 ). The second FRTU 320 may be a device that corrects an image based on measurement phase information of a reference device. The second FRTU 320 may be a FRTU unit immediately adjacent to the first FRTU 310 . For another example, the second FRTU 320 may be a FRTU device separate from the first FRTU 310 . In this case, at least one FRTU device may be interposed between the first FRTU 310 and the second FRTU 320 .

In various embodiments, the reference device and the receiving device may be determined by themselves according to preset rules or may be selected by an external device (eg, the DAS 140 of FIG. 1 ). A reference device and a receiver device may be determined from among a plurality of FRTU devices by selection of an external device or a manager of the system 300 through the external device.

In operation 303, the first FRTU 310 may obtain a power phase measurement value at a specific time as a reference device. The first FRTU 310 may generate phase information based on the measurement value. For example, the first FRTU 310 may measure a voltage and/or current signal on a wiring circuit at an arbitrary period and determine a phase value based on the measured voltage and/or current signal. A specific time can include a specific date (eg, 8:00 AM every day, or 5:00 PM on the 15th of each month) or a specific period (eg, every 4 hours).

Meanwhile, in operation 305, the second FRTU 320, as a receiver, may obtain a power phase measurement value at a specific time and generate phase information based on the measurement value. Both operations 303 and 303 are operations performed in the first FRTU 310 and the second FRTU 320 at a specific time, and may be performed simultaneously. That is, the first FRTU 310 and the second FRTU 320 may simultaneously measure power phases at a specific time and generate phase information for them.

In operation 309, the first FRTU 310 as a reference device may transmit phase information to the second FRTU 320 as a receiving device.

In operation 311, the second FRTU 320 compares the received phase information of the first FRTU 310 with directly generated phase information to determine whether there is an error. If it is determined that there is no error in the phase information of the first FRTU 310 and the second FRTU 320, the process may end, and the error in the phase information of the first FRTU 310 and the second FRTU 320 If there is, it may lead to operation 311.

In operation 311, when it is determined that there is an error, the second FRTU 320 may correct the error.

Meanwhile, in various embodiments of the present disclosure, the first FRTU 310 and the second FRTU 320 are configured to measure the power phase at a specific time, and the specific time is the first FRTU 310 and the second FRTU 320 It may be defined by each system time. Therefore, if the system time of the first FRTU 310 and the second FRTU 320 are different, even if the power phase is measured at a specific time, the phase is actually measured at a different time. Errors can occur in error correction. Therefore, it is important to synchronize the system times of the first FRTU 310 and the second FRTU 320 .

Accordingly, in the embodiment described in FIG. 3, since the first FRTU 310 as a reference device transmits only phase information to the second FRTU 320 as a receiving device, the first FRTU 310 and the second FRTU 320 Each requires an action to synchronize the system time prior to power phase measurement. Accordingly, each of the first FRTU 310 and the second FRTU 320 may need to perform an operation to synchronize the system time right before measuring the power phase (operations 303 and 305) or before a predetermined time. The operation of synchronizing the system time may be in accordance with Precision Time Protocol (PTP), Network Time Protocol (NTP) timeline, GPS timeline, Now Playing Time (NPT), and/or Coordinated Universal Time (UTC), and each FRTU This may be performed by the time detection unit 230 and the time synchronization unit 240 included in the device.

4 illustrates an FRTU as a reference device and a receiver device in a measurement and correction system on a distribution line according to various embodiments of the present disclosure. Referring to FIG. 4, the measurement and correction system 400 on the distribution line is a substation 401 (S/S, substation), an automatic switch or recloser installed on the distribution line 402 drawn from the substation 401. It may include a plurality of devices for distribution lines such as (410, 420, 430). The plurality of distribution line devices 410, 420, and 430 may be connected to the plurality of FRTUs 411, 412, and 413, respectively. A plurality of FRTUs 411, 412, and 413 may establish communication connections with each other. FIG. 5 illustrates an example of signaling between a plurality of FRTUs according to the embodiments shown in FIG. 4 . Referring to FIGS. 4 and 5 , a process of correcting a power phase by relaying phase information and time information between a plurality of FRTUs 411 , 412 , and 412 will be described.

In operation 501, the first FRTU 411 may be set as a reference device. The first FRTU 411 may be a FRTU device connected to the nearest distribution line device 410 in the substation 310 (substation 110). The second FRTU 421 may be a FRTU device immediately adjacent to the first FRTU 411 , and the third FRTU 431 may be a FRTU device immediately adjacent to the first FRTU 421 .

In operation 503, the first FRTU 411 may obtain a power phase measurement value at a specific time as a reference device and generate phase information based on the measurement value. Subsequently, in operation 505, the first FRTU 411 may transmit a message including phase information and time information about a specific time at which the phase information was measured to the second FRTU 421. In operation 507, the second FRTU 421 may synchronize the system time based on the time information received from the first FRTU 411. Thereafter, the second FRTU 421 may measure the power phase value at a time corresponding to the next cycle from the specific time when the first FRTU 411 measured the power phase measurement value.

In operation 509, the second FRTU 421 may transmit, to the third FRTU 431, a message including the phase information received from the first FRTU 411 and time information about a specific time when the phase information was measured. . Based on the received message, the third FRTU 431 may perform time synchronization in operation 511 and measure the power phase of the next cycle of the specific time.

In the embodiment described in FIGS. 4 and 5, the second FRTU 421 and the third FRTU 431 synchronize the system time based on the message including the reference time information received from the first FRTU 411, and synchronize the system time. Based on the specified time, the power phase value may be measured in the next cycle from the specific time at which the first FRTU 411 included in the message measured the phase measurement value. That is, according to various embodiments of the present disclosure, an FRTU device may perform time synchronization using reference time information of an FRTU serving as a reference device from an adjacent FRTU. In these embodiments, a network between adjacent FRTUs is a Time-Sensitive Network (TSN), and the message may be a safety message. In this way, when the FRTU device as a receiving device receives reference time information from the FRTU autonomous as a reference device, in a TSN-based system, the receiving device needs to perform time synchronization in consideration of the propagation delay time with the reference device or other receivers. there is. It takes a propagation delay time to transmit and receive a radio signal including reference time information, and time synchronization can be performed accurately only when this is taken into account. In addition, in order to consider the propagation delay time, information about the distance between the reference device and the receiving device or the time when the reference time information is transmitted by the reference device is required. This information may be included together with reference time information in an SMPP frame of Short Message Peer-to-peer Protocol (SMPP). In other words, the propagation delay time may be calculated according to time zone information or location information included in the SMPP frame.

Referring back to FIG. 4 , reference time information may be included in an SMPP data field among a plurality of fields constituting the SMPP frame 440 according to SMPP. More specifically, the SMPP data field may include a priority field 441 , an update time field 442 , a location field 443 , and a time field 444 . Meanwhile, the SMPP frame 440 may include phase information.

The priority field 510 may be assigned a value indicating an FRTU device (eg, the first FRTU 411) as a reference device. For example, an FRTU device set as a reference device assigns a value indicating that it is a reference device to the priority field 441, and an FRTU device that is not configured may assign a different value to the priority field 441.

The update time field 442 includes time information of the FRTU device transmitting the message. Since the FRTU devices can check the reception time of the SMPP frame, the transmission time can be checked through the time information of the FRTU device transmitting the message, and thus the propagation delay time can be calculated through the time information.

The location field 443 includes location information of the FRTU device transmitting the SMPP frame. The receiving device may calculate the distance to the reference device using the location information, and the propagation delay time may be calculated through the speed of the propagation.

The time field 444 includes reference time information. Depending on circumstances, a specific time at which the reference device or the receiving device measures the phase may be changed, and in this case, reference time information may also be changed. When the reference device is changed, time information stored in the update time field 442 may be used as reference time information, and the reference time information of the time field 444 may be updated with time information stored in the update time field 444. can

6 illustrates an FRTU as a reference device and a receiver device in a measurement and correction system on a distribution line according to various embodiments of the present disclosure. Referring to FIG. 6, the measurement and correction system 600 on the distribution line is a substation 601 (S/S, substation), an automatic switch or recloser installed on the distribution line 602 drawn from the substation 601. A plurality of distribution line devices 610 and 620 may be included. The plurality of distribution line devices 610 and 620 may be connected to the first FRTU 611 and the second FRTU 612, respectively. The first FRTU 611 and the second FRTU 612 may establish a wireless communication connection with each other, and the geographical distance between the first FRTU 611 and the second FRTU 612 is long, so that the first FRTU 611 ) and the radio access networks 603 and 604 (radio access networks, RANs) to which the second FRTU 612 connects, respectively, may be different.

The radio access networks 603 and 604 are networks to which FRTU devices, for example, the first FRTU 611 and the second FRTU 621 are directly connected, and may be an infrastructure that provides wireless access to the FRTU devices. . The radio access networks 603 and 604 may be a set of a plurality of base stations, and the plurality of base stations may perform communication through mutually formed interfaces. Base stations included in the wireless access networks 603 and 604 include 'access point (AP)', 'gNB (next generation node B)', '5G node', '5G node', 'access point (AP)' in addition to the base station. It may be referred to as a wireless point', a 'transmission/reception point (TRP)', or other terms having equivalent technical meaning.

In various embodiments, the first FRTU 611 and the second FRTU 621 consider delay time and stay time between the radio access networks 603 and 604 when the radio access networks 603 and 604 connected to each other are different. Thus, time synchronization can be performed. Specifically, the first FRTU 611 may request time synchronization while transmitting phase information to the second FRTU 621, which is a receiving device as a reference device. Each of the second FRTUs 621 receiving a request for time synchronization from the first FRTU 611 may receive a first parameter for time synchronization from a base station included in the connected radio access network 604 . The first parameter is the TSN switch, the first FRTU 611, the delay time of the link 2 between the base station and the network (delay link 2, D_Link2), the residence time in the core network (R_CN), and in the RAN It may include a residence time in RAN (R_RAN) of.

The second FRTU 621 may perform time synchronization with an adjacent network system using the received first and second parameters. In this case, the fourth parameter may include the frame stay time in the second FRTU 621 and the delay time of link 3 (delay link 3, D_Link3) between the slave of the TSN system and the terminal, base station, and the network including the UPF. there is. The second FRTU 621 may perform time synchronization with the first FRTU 611 by reflecting the first parameter and the second parameter in the correction field for time synchronization. In the above embodiment, only the downlink in which time synchronization is performed in the FRTU device has been described, but it is obvious to those skilled in the art that uplink may be considered.

In various embodiments, measurement phase information obtained from FRTU devices, transmission/reception information between FRTU devices, comparison information of measured phases, and correction history may be transmitted to an upper system (eg, a manager's computing device). can For example, when the phase correction is completed, the FRTU device may transmit a correction completion message to the upper system device. In addition, the upper system device displays the measured phase information received from the FRTU devices, the transmission and reception information between the FRTU devices, the comparison information of the measured phase, and the correction history so that the manager can determine whether a phase error has occurred and whether the correction has occurred. You can check if it has been done properly.

A measurement and correction system on a distribution line according to various embodiments of the present disclosure includes a substation (S/S, substation); A plurality of distribution line equipment installed on the distribution line drawn out from the substation; and a plurality of FRTUs respectively connected to the plurality of distribution line devices, wherein the plurality of FRTUs establish a wireless communication connection with each other, one of the plurality of FRTUs is set as a reference device, and at least one of the other FRTUs is received device, the reference device measures a first measurement phase value using voltage and current on a connected distribution line device, transmits the first measurement phase value to the receiving device, and the receiving device measures the first measurement phase value using the connected distribution line device. Phase value when it is determined that there is an error by measuring the second measured phase value using the voltage and current on the furnace equipment and comparing the received first measured phase value with the measured second measured phase value can be corrected. Various other embodiments are possible.

In various embodiments, the reference device and the receiving device periodically synchronize the system time with the reference time, and the reference device and the receiving device synchronize the system time with the reference time and then periodically at a specific time set within a predetermined time. It can be set to measure the phase value as

In various embodiments, the first measurement phase value is transmitted from the reference device to the receiving device through a message further including time information, and the receiving device performs a system based on the time information included in the message. Time is synchronized, and a second measurement phase value based on a specific time determined based on a frequency value included in the first measurement phase value may be measured.

In various embodiments, the receiving device relays and transmits the message received from the reference device to another nearby receiving device, and the other receiving device synchronizes system time based on time information included in the message , Measure a third measurement phase value based on a specific time determined based on the frequency value included in the first measurement phase value, and compare the received first measurement phase value with the measured second measurement phase value Thus, when it is determined that there is an error, the phase value can be corrected.

In various embodiments, the reference device transmits a message requesting time synchronization to the receiving device, and the reference device responds to receiving the message to a radio access network to which the reference device and the receiving device are connected. After confirming that these are different, the reference device can perform time synchronization based on the delay time between the wireless access networks and the sojourn time of the message when the wireless access networks are different.

In various embodiments, the time synchronization may be in accordance with Precision Time Protocol (PTP), Network Time Protocol (NTP) timeline, GPS timeline, Now Playing Time (NPT), and/or Coordinated Universal Time (UTC). .

In various embodiments, the receiving device may transmit information about a result of correcting the phase value to the user device so as to be displayed in the user device.

The above description of the present application is for illustrative purposes, and those skilled in the art will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

In the above, the object to be claimed in the present disclosure has been specifically examined. The subject matter claimed in this disclosure is not limited in scope to the specific implementations described above. For example, in some implementations it may be in the form of hardware operatively used on a device or combination of devices, in other implementations it may be implemented in the form of software and/or firmware, and in still other implementations it may be in the form of a signal bearing medium; It may include one or more items, such as storage media. Here, the storage medium, such as a CD-ROM, a computer disk, a flash memory, etc., when executed by a computing device, such as a computing system, a computing platform, or other system, may cause the corresponding processor to execute according to the implementation described above. can be saved. Such computing devices may include one or more processing units or processors, a display, one or more input/output devices such as a keyboard and/or mouse, and one or more memories such as static random access memory, dynamic random access memory, flash memory and/or hard drives. can include

In the foregoing detailed description, various embodiments of devices and/or processes have been described using block diagrams, flow diagrams, and/or other examples. Such block diagrams, flow diagrams, and/or other examples may include one or more functions and/or operations, and each function and/or operation in a block diagram, flow diagram, and/or other example may be hardware, software, firmware, or or any combination thereof, individually or collectively. In various embodiments, some portions of the subject matter described in this disclosure may be implemented via application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), digital signal processors (DSPs), or other forms of integration. In contrast, some aspects of embodiments of the present disclosure are directed to one or more computer programs running on one or more computers (eg, one or more programs running on one or more computer systems), one or more programs running on one or more processors (eg, one or more programs running on one or more computer systems). for example, one or more programs running on one or more microprocessors), firmware, or substantially any combination thereof, which may be implemented in whole or in part equivalently on an integrated circuit, writing code for software and/or firmware. and/or the design of the circuit is within the skill of those skilled in the art in light of this disclosure. Further, those skilled in the art will understand that the mechanisms of the present disclosure may be distributed in various forms of program product, and the examples of the present disclosure apply regardless of the specific type of signal bearing medium used to actually perform the distribution. will understand

While certain exemplary techniques have been described and illustrated herein using a variety of methods and systems, those skilled in the art will appreciate the possibility of various other modifications or equivalent substitutions without departing from the claimed subject matter. Additionally, many modifications may be made to adapt a particular situation to the teachings of claimed subject matter without departing from the central concept described herein. Thus, it is intended that the claimed subject matter is not limited to the specific examples disclosed, but that such claimed subject matter may also include all implementations falling within the scope of the appended claims and their equivalents.

The scope of the present disclosure is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present application. do.

Claims (7)

In the measurement and correction system on the distribution line,
Substation (S/S, substation);
A plurality of distribution line equipment installed on the distribution line drawn out from the substation; and
Includes a plurality of FRTUs respectively connected to the plurality of distribution line devices,
The plurality of FRTUs establish wireless communication connections with each other;
One of the plurality of FRTUs is set as a reference device, and at least one other is set as a receiving device;
The reference device measures a first measurement phase value using voltage and current on a connected distribution line device, and transmits the first measurement phase value to the receiving device;
The receiving device measures the second measurement phase value using the voltage and current on the connected distribution line device, compares the received first measurement phase value with the measured second measurement phase value, If it is determined that the phase value is corrected,
On-distribution line metering and correction system. According to claim 1,
The reference device and the receiving device periodically synchronize the system time with the reference time;
The reference device and the receiving device are set to periodically measure the phase value at a specific time set within a certain time after synchronizing the system time with the reference time,
On-distribution line metering and correction system. According to claim 1,
The first measurement phase value is transmitted from the reference device to the receiving device through a message further including time information;
The receiving device synchronizes system time based on time information included in the message and measures a second measurement phase value based on a specific time determined based on a frequency value included in the first measurement phase value.
On-distribution line metering and correction system. According to claim 3,
The receiving device relays and transmits the message received from the reference device to other adjacent receiving devices;
The other receiving device synchronizes system time based on the time information included in the message, and measures a third measurement phase value based on a specific time determined based on a frequency value included in the first measurement phase value, and comparing the received first measurement phase value with the measured second measurement phase value and correcting the phase value when it is determined that there is an error.
On-distribution line metering and correction system. According to claim 1,
The reference device transmits a message requesting time synchronization to the receiving device,
In response to receiving the message, the reference device determines whether the wireless access networks to which the reference device and the receiving device are connected are different, respectively;
The reference device performs time synchronization based on the delay time between the radio access networks and the sojourn time of the message when the radio access networks are different.
On-distribution line metering and correction system. According to claim 2,
The time synchronization is according to PTP (Precision Time Protocol), NTP (Network Time Protocol) timeline, GPS timeline, NPT (Now Playing Time) and / or UTC (Coordinated Universal Time),
On-distribution line metering and correction system. According to claim 1,
The receiving device transmits information about a result of correcting the phase value to the user device so that the user device displays it.
On-distribution line metering and correction system.