CN114337892B - Multi-equipment clock synchronization method based on low-voltage distribution network - Google Patents
Multi-equipment clock synchronization method based on low-voltage distribution network Download PDFInfo
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Abstract
The application belongs to the field of power system automation, and particularly discloses a multi-equipment clock synchronization method based on a low-voltage power distribution network, which comprises the steps of selecting one equipment on a power distribution line as a master equipment, and selecting other equipment as slave equipment; the master equipment and the slave equipment monitor the phase angle of the power frequency A phase current signal and obtain a corresponding first monitoring value and a corresponding second monitoring value; according to the judgment of the first monitoring value and the second monitoring value, the master equipment and the slave equipment mutually finish the sending of the time setting command, and record each moment at the same time; detecting the distance between the master device and the slave device, and generating a corresponding distance value; and correcting the propagation time from the slave device to the master device and the time deviation of the slave device according to each recorded moment and the generated distance value. According to the scheme, the phase of the phase current signal is used as a reference value for time adjustment between devices, so that the accuracy of clock time synchronization between the devices is greatly increased, and the time synchronization error between the devices is also greatly reduced.
Description
Technical Field
The application belongs to the field of power system automation, and particularly relates to a multi-equipment clock synchronization method based on a low-voltage power distribution network.
Background
At present, low-voltage distribution lines are widely spread in industry and agriculture, service industry and resident daily life, and due to the wide application range, the low-voltage distribution lines are used in different groups, so that not only are professionals in contact, but also more non-professionals are unaware of the low-voltage distribution lines, and meanwhile, the expertise is lacking as a guide, so that the records of faults of a low-voltage distribution power grid are greatly increased.
In specific fault judgment, time accurate synchronization is one of key technologies, and related application functions such as fault identification, impedance estimation, power quality diagnosis and the like can be realized through time accurate synchronization.
In the time synchronization method, there are methods of network time synchronization and global navigation system time synchronization. However, the existing method has some disadvantages, such as inaccurate corresponding time setting precision, easy influence of external environment, etc., so that the whole time setting process cannot be smoothly and accurately performed.
Disclosure of Invention
The application aims to provide a multi-device clock synchronization method based on a low-voltage power distribution network, which can improve the clock synchronization precision between devices and greatly reduce the synchronization error between the devices.
In order to achieve the above purpose, the technical scheme of the application provides a multi-device clock synchronization method based on a low-voltage power distribution network, which comprises the following steps:
selecting, namely selecting one device as a master device and other devices as slave devices on a power distribution line;
the detection step, the main equipment and the auxiliary equipment monitor the phase angle of the power frequency A phase current signal and obtain a corresponding first monitoring value and a corresponding second monitoring value;
a time setting step, namely according to the judgment of the first monitoring value and the second monitoring value, the master equipment and the slave equipment mutually finish the sending of a time setting command, and simultaneously record each moment;
a distance monitoring step, namely detecting the distance between the master equipment and the slave equipment and generating a corresponding distance value;
and a first correction step of correcting the propagation time from the slave device to the master device and the time deviation of the slave device according to each recorded moment and the generated distance value.
The principle and effect of this scheme are: the phase angle of the power frequency A phase current signal on the line is monitored by installing equipment on a power distribution line, then a certain equipment is selected as a master equipment, namely a standard clock source, other equipment is slave equipment, the master equipment and the slave equipment send time synchronization commands according to a first monitoring value and a second monitoring value of the phase angle, each time is recorded at the same time, then the distance between the master equipment and each slave equipment is detected, and finally the time deviation of the transmission time and the slave equipment is corrected according to each recorded time and distance value, so that the time of the slave equipment is consistent with that of the master equipment, and the clock synchronization of multiple equipment is realized.
According to the application, the phase angle of the power frequency A phase current signal on the power distribution line is used as a reference value for time adjustment between devices, so that the precision of clock time alignment between the devices is greatly increased, and the time alignment error between the devices is also greatly reduced.
Further, the first correction step includes:
a propagation time correction step, namely matching the time threshold value without correction according to each recorded moment and the generated distance value, calculating the propagation time of each slave device, and correcting the propagation time through judgment;
and a time correction step of calculating time deviation of each slave device and correcting time.
By correcting the propagation time and correcting the time deviation, the time error between the slave device and the master device is greatly reduced, and the correction accuracy is improved.
Further, the step of setting time includes:
a time setting starting step, namely recording the moment as a first moment when a first monitoring value generated by the master equipment reaches a preset angle value, and simultaneously, transmitting corresponding starting broadcast information to the slave equipment by the master equipment;
a first time setting step, when the slave device receives the starting broadcast information of the master device, recording the time as a second time, judging a second monitoring value after the second time, recording the time as a third time when the second monitoring value reaches a preset angle value, and sending a time setting request command to the master device;
a second time setting step, after receiving a time setting request command of the slave device, the master device records the time as a fourth time, simultaneously records the latest time when the monitoring value reaches a preset angle value before the fourth time as a fifth time, simultaneously judges the first monitoring value after the fourth time, records the time as a sixth time when the monitoring value reaches the preset angle value, and sends a time setting response command to the corresponding slave device;
and a feedback step, after the slave device receives the time setting response command of the master device, recording the time as a seventh time, and recording the optimal time when the second monitoring value reaches the preset angle value before the seventh time as an eighth time.
By accurately recording each moment, the calculation of the transmission time and time deviation is more accurate, and the problem of high correction error caused by unclear recording of each moment is avoided.
Further, the propagation time correction step includes:
matching, namely matching time thresholds of each slave device without correction according to the generated distance value;
a first calculation step of calculating the propagation time of the corresponding slave device according to each time recorded by the slave device;
and a first judging step, comparing and judging the propagation time with a time threshold value, and correcting the propagation time between each device and the main device according to the judging result.
The time threshold value which is not required to be corrected is reasonably matched through the distance value, so that the judgment of the whole propagation time is more diversified and changeable, and the whole propagation time is corrected more reasonably and accurately.
Further, the propagation time correction step further includes: and a sequencing step, namely sequencing the propagation time of each slave device from small to large.
The propagation conditions of the slave devices can be known more intuitively through sequencing the propagation times of the slave devices.
Further, the time correction step includes:
a time acquisition step of acquiring eighth time, sixth time, third time and fifth time of the slave devices arranged in front according to the sequence of the slave devices;
a time deviation calculation step of calculating the time deviation of the slave device based on the eighth time, the sixth time, the third time, and the fifth time;
and correcting the time of the slave device according to the time deviation, and then executing the time acquisition step.
The time deviation correction is carried out on each slave device in sequence, so that the processing capacity of the whole system can be greatly reduced, and meanwhile, the time correction is carried out one by one, so that the processing speed of single slave device is greatly increased.
Further, the method further comprises a second correction step, wherein the secondary equipment which does not need to be corrected in the propagation time from the secondary equipment to the primary equipment is matched according to the recorded time and the generated distance value, the secondary equipment is corrected in time deviation, then the selection step is executed, and the secondary equipment is selected as the primary equipment.
The slave equipment with the transmission time without correction is matched, then the time deviation is corrected, the slave equipment is taken as the master equipment, then the other slave equipment with the transmission time without correction is continuously matched, and the clock synchronization time of the equipment on the whole line is greatly reduced in a circulating mode, so that the whole clock synchronization work can be completed more rapidly.
Further, the method further comprises the following steps:
a data acquisition step, after all slave devices finish time correction, synchronously acquiring current values on a distribution line by using each device;
analyzing, namely analyzing and judging the current value of each device at the same time to judge the device with abnormal corresponding current value;
and a fault positioning step, namely calling out position information corresponding to the equipment from a database according to the equipment with abnormal current value.
After clock synchronization of each device is completed, current values collected by each device are analyzed at the same time, devices with abnormal current values are analyzed, and then position information of the devices is called out from a database, so that accurate positioning and accurate judgment of faults are realized.
Drawings
Fig. 1 is a flowchart of a multi-device clock synchronization method based on a low-voltage distribution network according to an embodiment of the present application.
Detailed Description
The following is a further detailed description of the embodiments:
embodiment one:
embodiment one is substantially as shown in fig. 1: a multi-device clock synchronization method based on a low-voltage power distribution network comprises the following steps:
selecting, namely selecting one device as a master device and other devices as slave devices on a power distribution line; in this embodiment, these devices are distribution automation terminals installed on distribution lines for detecting the operation conditions of the distribution lines, and each distribution terminal performs information transmission through a communication system. The choice of master device is arbitrary in this embodiment.
The detection step, the main equipment and the auxiliary equipment monitor the phase angle of the power frequency A phase current signal and obtain a corresponding first monitoring value and a corresponding second monitoring value;
a time setting step, namely according to the judgment of the first monitoring value and the second monitoring value, the master equipment and the slave equipment mutually finish the sending of a time setting command, and simultaneously record each moment;
the step of setting time comprises the following steps:
a time setting starting step, namely recording the moment as a first moment when a first monitoring value generated by the master equipment reaches a preset angle value, and simultaneously, transmitting corresponding starting broadcast information to the slave equipment by the master equipment;
a first time setting step, when the slave device receives the starting broadcast information of the master device, recording the time as a second time, judging a second monitoring value after the second time, recording the time as a third time when the second monitoring value reaches a preset angle value, and sending a time setting request command to the master device;
a second time setting step, after receiving a time setting request command of the slave device, the master device records the time as a fourth time, simultaneously records the latest time when the monitoring value reaches a preset angle value before the fourth time as a fifth time, simultaneously judges the first monitoring value after the fourth time, records the time as a sixth time when the monitoring value reaches the preset angle value, and sends a time setting response command to the corresponding slave device;
and a feedback step, after the slave device receives the time setting response command of the master device, recording the time as a seventh time, and recording the optimal time when the second monitoring value reaches the preset angle value before the seventh time as an eighth time.
A distance monitoring step, namely detecting the distance between the master equipment and the slave equipment and generating a corresponding distance value; in this embodiment, the master device and the slave device are both provided with GPS positioning, and the distance between the master device and the slave device is detected by the GPS positioning.
And a first correction step of correcting the propagation time from the slave device to the master device and the time deviation of the slave device according to each recorded moment and the generated distance value.
In this embodiment, the preset angle value is 0 degrees, that is, the master device and the slave device both transmit the timing command at the time when the phase angle of the power frequency a-phase current signal is monitored to be 0 degrees. For example, the master device is a, the slave device includes B, C, D, and the like, and when the phase angle of the power frequency a-phase current signal is detected to be 0 ° (the time is denoted as T0), the a sends a start broadcast message to all the upper power distribution terminals (B, C, D) on the same power distribution line, notifying that a is a standard clock source on the current line, and the power distribution terminals B, C, D on the line perform time synchronization with a as a standard clock;
b, the equipment receives the starting broadcast information of A at the moment T1 and prepares to time;
b, monitoring the moment (marked as T2) when the phase of the alternating current signal A is 0 DEG, and sending a time synchronization request command to A;
a receives a time setting request of B at the moment T3, and marks the latest moment when the phase of the current signal detected by the A before the moment T3 is 0 DEG as T4;
a, monitoring the moment (marked as T5) when the phase angle of the alternating current signal A is 0 DEG, and sending a time synchronization response command to B;
b receives the time setting feedback signal of A at the time T6, and the latest time when B detects that the current signal phase is 0 DEG before the time T6 is marked as T7.
The first correction step includes:
a propagation time correction step, namely matching the time threshold value without correction according to each recorded moment and the generated distance value, calculating the propagation time of each slave device, and correcting the propagation time through judgment;
the propagation time correction step includes:
a first matching step of matching time thresholds of each slave device without correction according to the generated distance value;
a first calculation step of calculating the propagation time of the corresponding slave device according to each time recorded by the slave device;
and a first judging step, comparing and judging the propagation time with a time threshold value, and correcting the propagation time between each device and the main device according to the judging result.
And a sequencing step, namely sequencing the propagation time of each slave device from small to large.
And a time correction step of calculating time deviation of each slave device and correcting time.
In this embodiment, the propagation time between the slave device and the master device is | (T3-T4) - (T6-T7) |, for example, when the time threshold corresponding to the distance value between the master device a and the slave device B is 10ms, when the specific judgment is made, if | (T3-T4) - (T6-T7) | < 10ms does not need to be corrected; if (T3-T4) - (T6-T7) |is greater than or equal to 10ms, if (T3-T4) >10, T7=T7-20 ms; if (T6-T7) >10, t4=t4-20 ms.
The time correction step includes:
a time acquisition step of acquiring eighth time, sixth time, third time and fifth time of the slave devices arranged in front according to the sequence of the slave devices;
a time deviation calculation step of calculating the time deviation of the slave device based on the eighth time, the sixth time, the third time, and the fifth time;
and correcting the time of the slave device according to the time deviation, and then executing the time acquisition step. In this example, the time deviation to the slave device was [ (T7-T5) + (T2-T4) ]/2.
In this embodiment, the time offset is calculated by a formula and then corrected, that is, subtracted, from the time of the slave B, because the time offset is corrected according to the order of the propagation times corresponding to the slave B, which is specifically B, D, C.
The embodiment also comprises a data acquisition step, wherein after all the slave devices complete time correction, each device is utilized to synchronously acquire the current value on the distribution line;
analyzing, namely analyzing and judging the current value of each device at the same time to judge the device with abnormal corresponding current value;
and a fault positioning step, namely calling out position information corresponding to the equipment from a database according to the equipment with abnormal current value.
For example, after the device B, C, D completes clock synchronization with the device a, the device A, B, C, D collects current values at corresponding positions, and then when the current values are analyzed, the analysis of the fault point is performed at the same time, so that the analysis of the fault point can be performed at the same time, the obtained result can be more accurate, and after the device with abnormal current values is analyzed, for example, the position information of the device B is called out from the database, so that the position of the fault point can be accurately and rapidly found through the position information, and maintenance work can be performed in time.
Embodiment two:
compared with the first embodiment, the present embodiment is different in that: the method also comprises a second correction step, wherein the secondary equipment which does not need to be corrected in the propagation time from the secondary equipment to the primary equipment is matched according to the recorded moments and the generated distance values, the secondary equipment is corrected in time deviation, then the selection step is executed, and the secondary equipment is selected as the primary equipment.
When the propagation time between the slave device and the master device is calculated, the corresponding slave device without correction is matched, then the slave device is corrected for time deviation, so that the slave device and the corresponding master device are in clock synchronization, the time synchronization of one slave device is completed, then the slave device is taken as the master device, the matching of the slave device without correction is continued, and then the slave device completes the time synchronization. For example, initially, device a is selected as a master device, device B, C, D and the like are slave devices, when slave devices without correction match, the slave devices match to device B, then correction of time offset is performed on device B so that device B is clock-synchronized with device a, then device B is selected as a corresponding master device, device C, D is a slave device, then slave devices without correction match in device C, D, then the slave devices are matched to device D, and then correction of time offset is performed on device D until clock synchronization is completed for all devices.
The foregoing is merely an embodiment of the present application, the present application is not limited to the field of this embodiment, and the specific structures and features well known in the schemes are not described in any way herein, so that those skilled in the art will know all the prior art in the field before the application date or priority date of the present application, and will have the capability of applying the conventional experimental means before the date, and those skilled in the art may, in light of the present application, complete and implement the present scheme in combination with their own capabilities, and some typical known structures or known methods should not be an obstacle for those skilled in the art to practice the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (7)
1. The multi-equipment clock synchronization method based on the low-voltage distribution network is characterized by comprising the following steps of: the method comprises the following steps:
selecting, namely selecting one device as a master device and other devices as slave devices on a power distribution line;
the detection step, the main equipment and the auxiliary equipment monitor the phase angle of the power frequency A phase current signal and obtain a corresponding first monitoring value and a corresponding second monitoring value;
a time setting step, namely according to the judgment of the first monitoring value and the second monitoring value, the master equipment and the slave equipment mutually finish the sending of a time setting command, and simultaneously record each moment;
a distance monitoring step, namely detecting the distance between the master equipment and the slave equipment and generating a corresponding distance value;
a first correction step of correcting propagation time from the slave device to the master device and time deviation of the slave device according to each recorded time and the generated distance value;
the method also comprises a second correction step, wherein the secondary equipment which does not need to be corrected in the propagation time from the secondary equipment to the primary equipment is matched according to the recorded moments and the generated distance values, the secondary equipment is corrected in time deviation, then the selection step is executed, and the secondary equipment is selected as the primary equipment.
2. The low voltage power distribution network-based multi-device clock synchronization method according to claim 1, wherein: the first correction step includes: a propagation time correction step, namely matching the time threshold value without correction according to each recorded moment and the generated distance value, calculating the propagation time of each slave device, and correcting the propagation time through judgment;
and a time correction step of calculating time deviation of each slave device and correcting time.
3. The low voltage power distribution network-based multi-device clock synchronization method according to claim 2, wherein: the step of setting time comprises the following steps:
a time setting starting step, namely recording the moment as a first moment when a first monitoring value generated by the master equipment reaches a preset angle value, and simultaneously, transmitting corresponding starting broadcast information to the slave equipment by the master equipment;
a first time setting step, when the slave device receives the starting broadcast information of the master device, recording the time as a second time, judging a second monitoring value after the second time, recording the time as a third time when the second monitoring value reaches a preset angle value, and sending a time setting request command to the master device;
a second time setting step, after receiving a time setting request command of the slave device, the master device records the time as a fourth time, simultaneously records the latest time when the monitoring value reaches a preset angle value before the fourth time as a fifth time, simultaneously judges the first monitoring value after the fourth time, records the time as a sixth time when the monitoring value reaches the preset angle value, and sends a time setting response command to the corresponding slave device;
and a feedback step, after the slave device receives the time setting response command of the master device, recording the time as a seventh time, and recording the optimal time when the second monitoring value reaches the preset angle value before the seventh time as an eighth time.
4. A multi-device clock synchronization method based on a low voltage distribution network according to claim 3, wherein: the propagation time correction step includes:
a first matching step of matching time thresholds of each slave device without correction according to the generated distance value;
a first calculation step of calculating the propagation time of the corresponding slave device according to each time recorded by the slave device;
and a first judging step, comparing and judging the propagation time with a time threshold value, and correcting the propagation time between each device and the main device according to the judging result.
5. The multi-device clock synchronization method based on the low-voltage distribution network according to claim 4, wherein: the propagation time correction step further includes: and a sequencing step, namely sequencing the propagation time of each slave device from small to large.
6. The low voltage power distribution network-based multi-device clock synchronization method according to claim 5, wherein: the time correction step includes:
a time acquisition step of acquiring eighth time, sixth time, third time and fifth time of the slave devices arranged in front according to the sequence of the slave devices;
a time deviation calculation step of calculating the time deviation of the slave device based on the eighth time, the sixth time, the third time, and the fifth time;
and correcting the time of the slave device according to the time deviation, and then executing the time acquisition step.
7. The low voltage power distribution network-based multi-device clock synchronization method of claim 6, wherein: further comprises:
a data acquisition step, after all slave devices finish time correction, synchronously acquiring current values on a distribution line by using each device;
analyzing, namely analyzing and judging the current value of each device at the same time to judge the device with abnormal corresponding current value; and a fault positioning step, namely calling out position information corresponding to the equipment from a database according to the equipment with abnormal current value.
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| CN104396180A (en) * | 2012-06-19 | 2015-03-04 | 日本电气株式会社 | Clock synchronization system, clock synchronization method, and storage medium whereupon clock synchronization program is stored |
| CN108267638A (en) * | 2016-12-30 | 2018-07-10 | 钜泉光电科技(上海)股份有限公司 | Power frequency synchronous communication signal supervisory instrument, system and method based on power frequency distortion |
| CN108762048A (en) * | 2018-06-01 | 2018-11-06 | 齐鲁工业大学 | A method of realizing distribution terminal clock synchronization using power frequency current signal |
| CN109921871A (en) * | 2018-12-20 | 2019-06-21 | 清华大学 | A kind of method for synchronizing time, device and network system |
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Patent Citations (4)
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| CN104396180A (en) * | 2012-06-19 | 2015-03-04 | 日本电气株式会社 | Clock synchronization system, clock synchronization method, and storage medium whereupon clock synchronization program is stored |
| CN108267638A (en) * | 2016-12-30 | 2018-07-10 | 钜泉光电科技(上海)股份有限公司 | Power frequency synchronous communication signal supervisory instrument, system and method based on power frequency distortion |
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