Remote nuclear phase system and method thereof

Abstract

The system comprises a GPS / Beidou time service module A, a GPS / Beidou time service module B, a sampling module A, a sampling module B, a time synchronization module, a wireless communication module, a difference compensation module A, a difference compensation module B, a difference compensation module C, a difference compensation module D, a difference compensation module E, a difference compensation module E, a difference compensation module E, a difference compensation module E, a difference compensation module E, a difference compensation module E and a difference compensation module E, the two are jointly accessed to the master control nuclear phase module; the method comprises the following steps: a main control nuclear phase module automatically starts a difference compensation mechanism to carry out modeling correction on a signal phase difference; and the corrected and compensated data is subjected to phase difference analysis through a main control phase checking module of the phase checking device control device, multi-point phase comparison is carried out, and a phase checking result is judged according to the phase difference. According to the invention, the application distance of the phase checking system is greatly increased, and the phase checking operation in the scene of mixed connection of various lines or long-distance connection of lines of the same type can be realized; the comparison robustness is improved, and the precision and the application range of the nuclear phase system are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power system measurement and detection, and in particular to a long-distance phase nucleation system and method thereof that combines double-ended sampling, time synchronization, wireless communication and a difference compensation algorithm. Background Art

[0002] In power transmission and distribution networks, phase checking is a crucial method for ensuring phase consistency between different lines and equipment. Phase checking results are directly related to the safe operation of the power system, particularly during substation outgoing lines, line maintenance and commissioning, and new line access. Accurate phase checking can effectively prevent accidents such as three-phase short circuits and reverse power transmission.

[0003] Existing phase checking methods and systems can meet some conventional phase checking needs. However, in special phase checking scenarios where cables and overhead lines are mixed, or where the distance between the two ends is long (hundreds of meters to several kilometers), existing phase checking technologies cannot achieve long-distance dual-end phase checking. They lack the ability to compensate for phase differences in mixed cable and overhead line connections, and lack the ability to synchronize phase checking at different locations, collaborate remotely, and upload results in real time. Therefore, it is necessary to propose a phase checking system that can adapt to long-distance phase checking applications. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a long-distance phase kernel system and method that combines double-ended sampling, time synchronization, wireless communication and difference compensation algorithm.

[0005] Technical solution: The long-distance phase checking system described in the present invention includes a GPS / Beidou timing module A, a GPS / Beidou timing module B, a sampling module A, a sampling module B, a time synchronization module, a wireless communication module, a difference compensation module A, a difference compensation module B and a main control phase checking module; the GPS / Beidou timing module A and the GPS / Beidou timing module B are respectively connected to the sampling module A and the sampling module B, the sampling module A and the sampling module B are simultaneously connected to the time synchronization module, the time synchronization module is connected to the wireless communication module, the wireless communication module is respectively connected to the difference compensation module A and the difference compensation module B, and the difference compensation module A and the difference compensation module B are jointly connected to the main control phase checking module.

[0006] Furthermore, the GPS / Beidou timing module A receives GPS or Beidou satellite timing signals to obtain accurate universal time, providing a unified time reference for the waveform data collected by the sampling module A.

[0007] Furthermore, the GPS / Beidou timing module B receives GPS or Beidou satellite timing signals to obtain accurate world unified time, providing a unified time reference for the waveform data collected by the sampling module B.

[0008] Furthermore, after receiving data from the GPS / Beidou timing module A, GPS / Beidou timing module B and the sampling module A, sampling module B, the time synchronization module dynamically corrects the time synchronization error and then outputs the synchronized sampling data to the wireless communication module.

[0009] Furthermore, the wireless communication module transmits the data of the sampling module A and the sampling module B synchronized by the time synchronization module to the main control core module in real time using a 5G network.

[0010] Furthermore, the difference compensation module A and the difference compensation module B perform difference compensation calculation on the transmitted phase data, correct the phase lag caused by cable or overhead line transmission, and output it to the main control phase verification module.

[0011] Furthermore, the main control phase checking module receives the phase data corrected by the difference compensation module A and the difference compensation module B, performs multi-point phase comparison, and determines whether the phase checking results are in phase based on the phase difference.

[0012] The remote phase nucleation method of the present invention comprises the following steps: Step 1: Connect the sampling unit of the device to the A-end and B-end lines respectively to ensure that the voltage signal can be stably collected; Step 2: Start the main control device and enter the line parameters of end A and end B in the setting interface, including line type, line length and environmental compensation parameters; Step 3: Sampling device A and sampling device B synchronously sample their respective lines and dynamically estimate and compensate for the sampling clock error using the built-in algorithm in the time synchronization module; Step 4: Send the real-time sampling data to the main control core module through the built-in wireless communication module; Step 5: The main control phase module will automatically activate the difference compensation mechanism to model and correct the signal phase differences caused by inconsistent line lengths and transmission delays, and compensate for the actual physical differences in real time; Step 6: The corrected and compensated data is subjected to phase difference analysis by the main control phase module of the phase detector control device, and then multi-point phase comparison is performed to determine the phase difference result.

[0013] Furthermore, the step 3 of dynamically estimating and compensating the sampling clock error includes the following steps: Step 3.1: Model the offset between the local clock of the measuring end and the standard time as a state vector. , in, i k is the local clock offset, oh kis the clock frequency offset, T is the transposed matrix, is the state vector; Step 3.2: Use the first-order linear model to predict the offset and drift state at the next moment. , in, is the sampling interval, is the next state vector; Step 3.3: Use high-precision PPS pulses to compare the GNSS standard time with the event timestamps generated by the local acquisition clock to form the observation value satisfy: , in: is the Gaussian white noise measurement error, i k is the local clock offset, is the formed observation value; Step 3.4: By introducing the Kalman gain , update the predicted state according to the actual observation value: , in, is the observed offset, is the actual observed value, is the predicted observation value; Step 3.5: Update the offset estimate As a time correction amount, the original sampling timestamp Make corrections to obtain waveform timestamps under the standard time base , , in, is the offset estimate, is the original sampling timestamp, It is the standard waveform timestamp.

[0014] Furthermore, the step 5 of signal phase difference modeling correction includes the following steps: Step 5.1: Set the cable length L , get the cable velocity coefficient , calculate the cable signal propagation speed: , in, c is the speed of light, is the cable signal propagation speed; Step 5.2: Calculate the transmission time delay: , Calculate the phase delay: , Sampling the cable phase Make corrections: , in, is the transmission time delay; is the phase delay; is the cable sampling phase.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) Apply GPS / Beidou timing module to add time tags to the sampling data, dynamically correct the time synchronization error of the sampling data, and output the synchronized sampling data to the wireless communication module, which greatly improves the application distance of the phase nucleation system; (2) Phase compensation calculation is performed for long-distance cable lines and overhead lines, which can realize phase verification operations in scenarios where multiple lines are mixed or the same type of lines are connected over long distances; (3) Multi-point phase comparison of data under the same standard time reference improves the robustness of the comparison and greatly enhances the accuracy and application range of the phase nuclear system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a system structure diagram of the present invention; Figure 2 This is an operational logic diagram of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, the long-distance phase correlation system described in the present invention includes a GPS / Beidou timing module A, a GPS / Beidou timing module B, a sampling module A, a sampling module B, a time synchronization module, a wireless communication module, a difference compensation module A, a difference compensation module B and a main control phase correlation module; the GPS / Beidou timing module A and the GPS / Beidou timing module B are respectively connected to the sampling module A and the sampling module B, the sampling module A and the sampling module B are simultaneously connected to the time synchronization module, the time synchronization module is connected to the wireless communication module, the wireless communication module is respectively connected to the difference compensation module A and the difference compensation module B, and the difference compensation module A and the difference compensation module B are jointly connected to the main control phase correlation module.

[0019] The GPS / Beidou timing module A receives GPS or Beidou satellite timing signals, obtains accurate universal time, and provides a unified time reference for the waveform data collected by the sampling module A. The GPS / Beidou timing module B receives GPS or Beidou satellite timing signals, obtains accurate universal time, and provides a unified time reference for the waveform data collected by the sampling module B.

[0020] The sampling module A performs high-precision sampling on the voltage / current waveform of the local power line to obtain the original phase data. The sampled data is marked with a time tag (provided by the timing module A) and then output to the time synchronization module.

[0021] The sampling module B performs high-precision sampling on the voltage / current waveform of the local power line to obtain the original phase data. The sampled data is marked with a time tag (provided by the timing module B) and then output to the time synchronization module.

[0022] After receiving data from GPS / Beidou timing module A, GPS / Beidou timing module B and sampling module A, sampling module B, the time synchronization module dynamically corrects the time synchronization error and then outputs the synchronized sampling data to the wireless communication module.

[0023] The difference compensation module A and the difference compensation module B perform difference compensation calculation on the transmitted phase data, correct the phase lag caused by cable or overhead line transmission, and output it to the main control phase verification module.

[0024] The wireless communication module transmits the data of sampling module A and sampling module B synchronized by the time synchronization module to the main control core module in real time using a 5G network.

[0025] like Figure 2 As shown in the figure, the long-distance phase checking system is suitable for phase checking operations in scenarios where multiple lines are mixed, such as cable lines and overhead lines, cable lines and cable lines, and overhead lines and overhead lines, or where the same type of lines are connected over long distances. It is especially suitable for phase checking applications between the two ends of lines that are far apart (such as hundreds of meters to several kilometers).

[0026] The specific operation logic is as follows: Step 1: Connect the sampling unit of the device to the A-end and B-end lines respectively to ensure that the voltage signal can be stably collected; Step 2: Start the main control device and enter the line parameters of end A and end B in the setting interface, including line type, line length and environmental compensation parameters; Step 3: Sampling device A and sampling device B synchronously sample their respective lines and dynamically estimate and compensate for the sampling clock error using the built-in algorithm in the time synchronization module; The time synchronization error dynamic correction dynamically estimates and compensates the sampling clock error through real-time Kalman filtering and adaptive drift prediction, including the following steps: Step 3.1: Model the offset between the local clock of the measuring end and the standard time as a state vector. , in, i k is the local clock offset, oh k is the clock frequency offset, T is the transposed matrix, is the state vector; Step 3.2: Use the first-order linear model to predict the offset and drift state at the next moment. , in, is the sampling interval, is the next state vector; Step 3.3: Use high-precision PPS pulses to compare the GNSS standard time with the event timestamps generated by the local acquisition clock to form the observation value satisfy: , in: is the Gaussian white noise measurement error, i k is the local clock offset, is the formed observation value; Step 3.4: By introducing the Kalman gain , update the predicted state according to the actual observation value: , in, is the observed offset, is the actual observed value, is the predicted observation value; Step 3.5: Update the offset estimate As a time correction amount, the original sampling timestamp Make corrections to obtain waveform timestamps under the standard time base , , in, is the offset estimate, is the original sampling timestamp, It is the standard waveform timestamp.

[0027] Step 4: Send the real-time sampling data to the main control core module through the built-in wireless communication module.

[0028] Step 5: The main control phase module will automatically activate the difference compensation mechanism to model and correct the signal phase differences caused by inconsistent line lengths and transmission delays, and compensate for the actual physical differences in real time; The cable line difference compensation calculation includes the following steps: Step 5.1: Set the cable length L , get the cable velocity coefficient , calculate the cable signal propagation speed: , in, c is the speed of light, take 300,000,000 m / s, is the cable signal propagation speed; Step 5.2: Calculate the transmission time delay: , Calculate the phase delay: , Sampling the cable phase Make corrections: , in, is the transmission time delay; is the phase delay; is the cable sampling phase.

[0029] When the length of the overhead line exceeds 5 kilometers, the overhead line adopts differential compensation and sets the length of the overhead line. L , get the overhead line speed coefficient , calculate the overhead line signal propagation speed:

[0030] Where c is the speed of light, which is 300,000,000 m / s. Calculate the transmission time delay: , Calculate the phase delay: , Sampling phase of overhead lines Make corrections: .

[0031] Step 6: The corrected and compensated data is subjected to phase difference analysis by the main control phase module of the phase detector control device, and then multi-point phase comparison is performed to determine the phase difference result.

[0032] The main control phase check module receives the phase data corrected by the difference compensation module A and the difference compensation module B, performs multi-point phase comparison, and determines whether the phase check results are in phase based on the phase difference;

[0033] Assume that the phases at both ends are measured in N consecutive cycles as follows: ,

[0034] Calculate the phase difference in each cycle: ,

[0035] Correct the phase difference so that it falls within Within the range: , ,

[0036] Calculate the phase difference in each cycle: ,

[0037] Correct the phase difference so that it falls within Within the range: , Judgment logic, judgment threshold , calculate the average phase difference: ,

[0038] The conditions for judging whether the phase difference results are in phase are as follows: If more than 80% of the phase difference is less than , then it is judged to be in the same phase; If more than 80% of the phase difference is greater than , it is judged as reverse phase; Otherwise it is uncertain or requires manual review.

Claims

1. A remote nuclear phase system, characterized in that: It includes GPS / Beidou timing module A, GPS / Beidou timing module B, sampling module A, sampling module B, time synchronization module, wireless communication module, difference compensation module A, difference compensation module B and main control core phase module; GPS / Beidou timing module A and GPS / Beidou timing module B are connected to sampling module A and sampling module B respectively, sampling module A and sampling module B are simultaneously connected to the time synchronization module, the time synchronization module is connected to the wireless communication module, the wireless communication module is respectively connected to difference compensation module A and difference compensation module B, and difference compensation module A and difference compensation module B are jointly connected to the main control core phase module.

2. The remote phase nucleation system according to claim 1, characterized in that: The GPS / Beidou timing module A receives GPS or Beidou satellite timing signals, obtains accurate universal time, and provides a unified time reference for the waveform data collected by the sampling module A.

3. The remote phase nucleation system according to claim 1, characterized in that: The GPS / Beidou timing module B receives GPS or Beidou satellite timing signals, obtains accurate universal time, and provides a unified time reference for the waveform data collected by the sampling module B.

4. The remote phase nucleation system according to claim 1, characterized in that: After receiving data from GPS / Beidou timing module A, GPS / Beidou timing module B and sampling module A, sampling module B, the time synchronization module dynamically corrects the time synchronization error and then outputs the synchronized sampling data to the wireless communication module.

5. The remote phase nucleation system according to claim 1, characterized in that: The wireless communication module transmits the data of sampling module A and sampling module B synchronized by the time synchronization module to the main control core module in real time using a 5G network.

6. The remote phase nucleation system according to claim 1, characterized in that: The difference compensation module A and the difference compensation module B perform difference compensation calculation on the transmitted phase data, correct the phase lag caused by cable or overhead line transmission, and output it to the main control phase verification module.

7. The remote phase nucleation system according to claim 1, characterized in that: The main control phase checking module receives the phase data corrected by the difference compensation module A and the difference compensation module B, performs multi-point phase comparison, and determines whether the phase checking results are in phase based on the phase difference.

8. A remote phase nuclear method, characterized in that: The steps include: Step 1: Connect the sampling unit of the device to the A-end and B-end lines respectively to ensure that the voltage signal can be stably collected; Step 2: Start the main control device and enter the line parameters of end A and end B in the setting interface, including line type, line length and environmental compensation parameters; Step 3: Sampling device A and sampling device B synchronously sample their respective lines and dynamically estimate and compensate for the sampling clock error using the built-in algorithm in the time synchronization module; Step 4: Send the real-time sampling data to the main control core module through the built-in wireless communication module; Step 5: The main control phase module will automatically activate the difference compensation mechanism to model and correct the signal phase differences caused by inconsistent line lengths and transmission delays, and compensate for the actual physical differences in real time; Step 6: The corrected and compensated data is subjected to phase difference analysis by the main control phase module of the phase detector control device, and then multi-point phase comparison is performed to determine the phase difference result.

9. The remote phase nucleation method according to claim 8, characterized in that: The step 3 of dynamically estimating and compensating the sampling clock error comprises the following steps: Step 3.1: Model the offset between the local clock of the measuring end and the standard time as a state vector. ， in, θ k is the local clock offset, ω k is the clock frequency offset, T is the transposed matrix, is the state vector; Step 3.2: Use the first-order linear model to predict the offset and drift state at the next moment. ， in, is the sampling interval, is the next state vector; Step 3.3: Use high-precision PPS pulses to compare the GNSS standard time with the event timestamps generated by the local acquisition clock to form the observation value satisfy: ， in: is the Gaussian white noise measurement error, θ k is the local clock offset, is the formed observation value; Step 3.4: By introducing the Kalman gain , update the predicted state according to the actual observation value: ， in, is the observed offset, is the actual observed value, is the predicted observation value; Step 3.5: Update the offset estimate As a time correction amount, the original sampling timestamp Make corrections to obtain waveform timestamps under the standard time base , ， in, is the offset estimate, is the original sampling timestamp, It is the standard waveform timestamp.

10. The remote phase nucleation method according to claim 8, characterized in that: The step 5 of signal phase difference modeling correction includes the following steps: Step 5.1: Set the cable length L , get the cable velocity coefficient , calculate the cable signal propagation speed: ， in, c is the speed of light, is the cable signal propagation speed; Step 5.2: Calculate the transmission time delay: ， Calculate the phase delay: , Sampling the cable phase Make corrections: ， in, is the transmission time delay; is the phase delay; is the cable sampling phase.

Images