CN110888014B - Line protection traveling wave distance measurement method and device - Google Patents
Line protection traveling wave distance measurement method and device Download PDFInfo
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- CN110888014B CN110888014B CN201910976745.4A CN201910976745A CN110888014B CN 110888014 B CN110888014 B CN 110888014B CN 201910976745 A CN201910976745 A CN 201910976745A CN 110888014 B CN110888014 B CN 110888014B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/265—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured making use of travelling wave theory
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Abstract
The invention discloses a line protection traveling wave distance measurement method which comprises the steps of carrying out fault detection according to collected power frequency data and traveling wave data, and judging whether protection starting and traveling wave starting are carried out or not; responding to protection starting and traveling wave starting, performing protection ranging, and performing traveling wave head moment calculation according to protection phase selection; performing traveling wave ranging according to the wave head time of the traveling wave at the home terminal, the traveling wave parameters and the collected wave head time of the traveling wave at the opposite terminal of the line; and comparing all the ranging results, and selecting the optimal ranging result as the final ranging result. A corresponding apparatus is also disclosed. According to the invention, protection starting and traveling wave starting are combined, namely, subsequent ranging is carried out only when both are started, so that effective data coverage caused by frequently triggering data storage during starting is effectively prevented; meanwhile, the traveling wave ranging is carried out based on protection phase selection, so that the complexity of the traveling wave ranging is reduced, and the stability is improved.
Description
Technical Field
The invention relates to a line protection traveling wave distance measurement method and device, and belongs to the technical field of relay protection of power systems.
Background
The power transmission line fault location has important significance for rapidly recovering power supply and improving the stability of a power system. At present, the method for measuring the distance of the power transmission line roadblock mainly comprises an impedance method and a traveling wave method, the fault distance measurement of most power transmission lines depends on the impedance method of a protection device, but the method is influenced by various factors to cause larger distance measurement precision error; the traveling wave rule has great advantages in fault location, is not easily influenced by operation modes and fault types, is applied to engineering at present, but is provided with a traveling wave location device, so that work of adding a host, laying a secondary cable, adding a communication channel and the like needs to be completed, and workload of later maintenance is increased.
Therefore, as in patent 201820483792.6 and patent 201820831185.4, the travelling wave ranging and line protection are integrated, but the integrated device has the following problems: the traveling wave starting is too sensitive and is easily interfered by load fluctuation to cause unreliable starting, and the traveling wave starting frequently acts and triggers data storage to easily cause coverage of effective data; the phase selection of the traveling wave ranging needs to compare and analyze a phase mode, a zero mode and a line mode, and the algorithm is complex and has low stability.
Disclosure of Invention
The invention provides a line protection traveling wave distance measurement method and a line protection traveling wave distance measurement device, which solve the problems disclosed in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the line protection traveling wave distance measurement method comprises the steps of,
carrying out fault detection according to the collected power frequency data and traveling wave data, and judging whether protection starting and traveling wave starting are carried out;
responding to protection starting and traveling wave starting, performing protection ranging, and performing traveling wave head moment calculation according to protection phase selection;
performing traveling wave ranging according to the wave head time of the traveling wave at the home terminal, the traveling wave parameters and the collected wave head time of the traveling wave at the opposite terminal of the line;
and comparing all the ranging results, and selecting the optimal ranging result as the final ranging result.
And selecting a corresponding module value according to the protection phase selection, and calculating the wave head moment of the traveling wave by adopting a wavelet transform algorithm.
The protection ranging comprises protection single-ended ranging and protection double-ended ranging, the traveling wave ranging comprises traveling wave single-ended ranging and traveling wave double-ended ranging, the traveling wave double-ended ranging results are compared with the rest ranging results respectively, if the traveling wave double-ended ranging results are consistent with any ranging result, the traveling wave double-ended ranging is selected as a final ranging result, if the traveling wave double-ended ranging results are inconsistent with any ranging result, the ranging result with the largest error in the four ranging results is eliminated, two nearest ranging results in the rest three ranging results are selected to obtain an average value, and the average value is used as the final ranging result.
And the traveling wave parameter is traveling wave speed, and in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, the traveling wave speed is calculated according to the length of the line and the wave head time of the traveling wave at the two ends of the line and used for the subsequent traveling wave ranging calculation.
The line protection traveling wave distance measuring device comprises,
a protection module:
carrying out fault detection on the collected power frequency data, and judging whether protection starting is carried out or not;
responding to the protection starting, sending a protection starting signal to the traveling wave module, and performing protection ranging;
receiving a traveling wave head moment started by a traveling wave and sending the traveling wave head moment to the opposite end of the line;
receiving the traveling wave head time of the opposite end of the line, and performing traveling wave ranging according to the traveling wave head time of the local end, the traveling wave parameters and the traveling wave head time of the opposite end of the line;
comparing all the ranging results, and selecting the optimal ranging result as a final ranging result;
a traveling wave module:
carrying out fault detection on the collected traveling wave data, and judging whether traveling wave starting is carried out or not;
and responding to the traveling wave starting and receiving a protection starting signal, calculating the traveling wave head moment according to protection phase selection, and sending the traveling wave head moment to the protection module.
The traveling wave parameter is traveling wave speed, and the function of protection module still includes: and in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, calculating the traveling wave speed according to the length of the line and the traveling wave head moments at two ends of the line, and using the traveling wave speed for the subsequent traveling wave distance measurement calculation.
The traveling wave module comprises a first ADC, a first FPGA and a first DSP;
a first ADC: sampling traveling wave data according to the sampling evaluation rate;
a first FPGA: sending sampling frequency to the first ADC, receiving sampling traveling wave data and sending the sampling traveling wave data to the first DSP;
a first DSP: receiving sampled traveling wave data to perform fault detection, and judging whether traveling wave starting is performed or not; and responding to the traveling wave starting and receiving a protection starting signal, calculating the traveling wave head moment according to protection phase selection, and sending the traveling wave head moment to the protection module.
The protection module comprises a second ADC, a second FPGA and a second DSP;
a second ADC: sampling power frequency data according to the sampling evaluation rate;
a second FPGA: sending out a sampling frequency to a second ADC;
a second DSP: receiving sampled power frequency data, carrying out fault detection, and judging whether protection starting is carried out or not; responding to the protection starting, sending a protection starting signal to the traveling wave module, and performing protection ranging; receiving a traveling wave head moment started by a traveling wave and sending the traveling wave head moment to the opposite end of the line; receiving the traveling wave head time of the opposite end of the line, and performing traveling wave ranging according to the traveling wave head time of the local end, the traveling wave speed and the traveling wave head time of the opposite end of the line; comparing all the ranging results, and selecting the optimal ranging result as a final ranging result; and in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, calculating the traveling wave speed according to the length of the line and the traveling wave head moments at two ends of the line, and using the traveling wave speed for the subsequent traveling wave distance measurement calculation.
The second DSP communicates with the peer through the OTM plug-in.
And all data generated by the traveling wave module and the protection module are stored in the ARM through the second FPGA to form a traveling wave recording file.
The invention achieves the following beneficial effects: according to the invention, protection starting and traveling wave starting are combined, namely, subsequent ranging is carried out only when both are started, so that effective data coverage caused by frequently triggering data storage during starting is effectively prevented; meanwhile, the traveling wave ranging is carried out based on protection phase selection, so that the complexity of the traveling wave ranging is reduced, and the stability is improved.
Drawings
FIG. 1 is a block diagram of the structure of the apparatus;
FIG. 2 is a data interaction diagram;
FIG. 3 is a diagram of startup logic;
FIG. 4 is a flow of calculation of wave head time;
FIG. 5 is a preferred flow;
fig. 6 is a traveling wave velocity calibration.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the line protection traveling wave ranging method includes the following steps:
step 1, acquiring power frequency data and traveling wave data, performing fault detection, and judging whether protection starting and traveling wave starting are performed; the power frequency data is used for judging whether protection starting is carried out, and the traveling wave data is used for judging whether traveling wave starting is carried out.
And 2, responding to the protection start and the traveling wave start, performing protection ranging, and performing traveling wave head time calculation according to protection phase selection.
Because the traveling wave is started sensitively, the traveling wave is started earlier than the protection, after the traveling wave is started for a plurality of time periods, the protection is detected to be started, namely, both the traveling wave and the protection are started, the protection ranging is carried out, the traveling wave head time is calculated according to the protection phase selection, and meanwhile, a storage mechanism is also triggered.
Protection ranging is a function that the existing protection device has, and mainly comprises protection single-ended ranging and protection double-ended ranging.
After protection phase selection, selecting a corresponding module value according to the protection phase selection, and calculating the wave head moment of the traveling wave by adopting a wavelet transform algorithm; such as: the protection phase selection is A phase, and then the phase mode is selected in the traveling wave rangingaCalculating; protecting the selected phase as B phase, and selecting phase modebCalculating; protecting the selected phase to be C phase, and selecting phase modecCalculating; if the protection phase selection is AB phase, selecting a line mode alpha for calculation; if the protection phase is BC phase, then the linear mode beta is selectedCalculating; and if the protection phase selection is the CA phase, selecting a linear modulus gamma for calculation.
And 3, performing traveling wave ranging according to the wave head time of the traveling wave of the home terminal, the traveling wave parameters and the collected wave head time of the traveling wave of the opposite terminal of the line.
The traveling wave ranging comprises traveling wave single-end ranging and traveling wave double-end ranging; the traveling wave parameter is traveling wave speed, and at the beginning, the traveling wave speed is a preset value, but after the method is operated, the traveling wave speed needs to be automatically calibrated, namely, the traveling wave speed is calculated according to the length of the line and the time of the traveling wave head at the two ends of the line in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, and is used for the subsequent traveling wave distance measurement calculation. By means of the automatic calibration, the subsequent distance measurement precision is improved.
Step 4, comparing all the distance measurement results, and selecting the optimal distance measurement result as the final distance measurement result; and a more reasonable distance measurement result is obtained through preference, and the distance measurement precision is improved.
And respectively comparing the traveling wave double-end ranging result with the rest ranging results, selecting the traveling wave double-end ranging as a final ranging result if the traveling wave double-end ranging result is consistent with any ranging result, eliminating the one with the largest error in the four ranging results if the traveling wave double-end ranging result is inconsistent with any ranging result, and selecting the two closest ranging results from the rest three ranging results to calculate an average value to be used as the final ranging result.
According to the method, protection starting and traveling wave starting are combined, namely, subsequent ranging is carried out only when both are started, so that effective data coverage caused by frequent data storage triggering during starting is effectively prevented; meanwhile, the method carries out traveling wave ranging based on protection phase selection, reduces the complexity of traveling wave ranging and improves the stability.
As shown in fig. 1 and 2, the line protection traveling wave ranging apparatus includes a protection module, a traveling wave module, a second ADC, and an OTM card.
The traveling wave module comprises a first ADC, a first FPGA and a first DSP which are connected in sequence.
The first ADC is externally connected with the CT, traveling wave data sampling is carried out according to sampling evaluation, the low-pass cut-off frequency is 6kHz, and sampling interruption (namely sampling evaluation) is 2 MHz.
The sampling frequency of the first ADC is sent by the first FPGA, and the first FPGA also receives sampled traveling wave data and sends the sampled traveling wave data to the first DSP.
The first DSP functions as follows:
1. receiving sampled traveling wave data to perform fault detection, and judging whether traveling wave starting is performed or not;
2. responding to the traveling wave starting and receiving a protection starting signal, calculating the traveling wave head moment according to protection phase selection, and sending the traveling wave head moment to a protection module;
3. and receiving an interrupt instruction sent by the protection module.
As shown in fig. 3, the traveling wave start is sensitive, so the traveling wave start is generally earlier than the protection start, and after the traveling wave start for a certain period of time, the protection start is detected, that is, both the traveling wave start and the protection start are started, then protection ranging is performed, traveling wave head time calculation is performed according to protection phase selection, and a storage mechanism is also triggered.
After the protection phase selection as shown in fig. 4, a corresponding module value is selected according to the protection phase selection, and the traveling wave head time is calculated by adopting a wavelet transform algorithm.
The protection module comprises a second ADC, a second FPGA, a second DSP and an ARM.
And the second ADC is externally connected with a CT and a PT, and is used for sampling power frequency data according to the sampling evaluation rate, the low-pass cut-off frequency is 450Hz, and the sampling interruption (namely the sampling evaluation rate) is 1.2 kHz.
The sampling frequency of the second ADC is sent by the second FPGA, and the second FPGA sends an interrupt instruction to the second DSP and the first DSP so as to control the synchronous interrupt of the whole device.
The second DSP functions as follows:
1. receiving sampled power frequency data, carrying out fault detection, and judging whether protection starting is carried out or not;
2. responding to the protection starting, sending a protection starting signal to the traveling wave module, and performing protection ranging;
3. receiving a traveling wave head moment started by a traveling wave and sending the traveling wave head moment to the opposite end of the line;
4. receiving the traveling wave head time of the opposite end of the line, and performing traveling wave ranging according to the traveling wave head time of the local end, the traveling wave speed and the traveling wave head time of the opposite end of the line;
5. comparing all the ranging results, and selecting the optimal ranging result as a final ranging result;
as shown in fig. 5, the traveling wave double-end ranging results are respectively compared with the remaining ranging results, if the traveling wave double-end ranging results are consistent with any ranging result, the traveling wave double-end ranging is selected as the final ranging result, if the traveling wave double-end ranging results are not consistent with any ranging result, the ranging result with the largest error in the four ranging results is eliminated, and two nearest ranging results in the remaining three ranging results are selected to be averaged and used as the final ranging result.
6. In response to detecting that the fault is outside the zone or caused by manual closing, as shown in fig. 6, the traveling wave speed is calculated according to the length of the line and the time of the traveling wave head at both ends of the line for later traveling wave ranging calculation.
And the OTM plug-in is used for realizing the communication between the second DSP and the opposite terminal device and carrying out the transmission of the traveling wave head at any time.
And the ARM stores all data generated by the traveling wave module and the protection module to form a traveling wave recording file.
The traveling wave ranging of the device is realized by an independent module, an independent ADC is configured, sampling interruption is completely independent, only a small amount of signals are interacted between the traveling wave DSP plug-in and the protection CPU plug-in to form the slave device, decoupling operation of traveling wave ranging and protection functions is realized on the software and hardware architecture level, and the traveling wave ranging function is guaranteed not to influence protection stability.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The line protection traveling wave distance measurement method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
carrying out fault detection according to the collected power frequency data and traveling wave data, and judging whether protection starting and traveling wave starting are carried out;
in response to the protection initiation and the traveling wave initiation,protection ranging is carried out, and traveling wave head time calculation is carried out according to protection phase selection; wherein, the protection phase selection is A phase, and then the phase mode is selected in the traveling wave rangingaCalculating; protecting the selected phase as B phase, and selecting phase modebCalculating; protecting the selected phase to be C phase, and selecting phase modecCalculating; if the protection phase selection is AB phase, selecting a line mode alpha for calculation; if the protection phase selection is BC phase, selecting a linear mode beta for calculation; if the protection phase selection is a CA phase, selecting a linear mode gamma for calculation;
performing traveling wave ranging according to the wave head time of the traveling wave at the home terminal, the traveling wave parameters and the collected wave head time of the traveling wave at the opposite terminal of the line;
comparing all the ranging results, and selecting the optimal ranging result as a final ranging result;
the protection ranging comprises protection single-ended ranging and protection double-ended ranging, the traveling wave ranging comprises traveling wave single-ended ranging and traveling wave double-ended ranging, the traveling wave double-ended ranging results are compared with the rest ranging results respectively, if the traveling wave double-ended ranging results are consistent with any ranging result, the traveling wave double-ended ranging is selected as a final ranging result, if the traveling wave double-ended ranging results are inconsistent with any ranging result, the ranging result with the largest error in the four ranging results is eliminated, two nearest ranging results in the rest three ranging results are selected to obtain an average value, and the average value is used as the final ranging result.
2. The line protection traveling wave ranging method according to claim 1, wherein: and selecting a corresponding module value according to the protection phase selection, and calculating the wave head moment of the traveling wave by adopting a wavelet transform algorithm.
3. The line protection traveling wave ranging method according to claim 1, wherein: and the traveling wave parameter is traveling wave speed, and in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, the traveling wave speed is calculated according to the length of the line and the wave head time of the traveling wave at the two ends of the line and used for the subsequent traveling wave ranging calculation.
4. Line protection travelling wave range unit, its characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a protection module:
carrying out fault detection on the collected power frequency data, and judging whether protection starting is carried out or not;
responding to the protection starting, sending a protection starting signal to the traveling wave module, and performing protection ranging;
receiving a traveling wave head moment started by a traveling wave and sending the traveling wave head moment to the opposite end of the line;
receiving the traveling wave head time of the opposite end of the line, and performing traveling wave ranging according to the traveling wave head time of the local end, the traveling wave parameters and the traveling wave head time of the opposite end of the line;
comparing all the ranging results, and selecting the optimal ranging result as a final ranging result;
the protection ranging comprises protection single-ended ranging and protection double-ended ranging, the traveling wave ranging comprises traveling wave single-ended ranging and traveling wave double-ended ranging, the traveling wave double-ended ranging results are compared with the rest ranging results respectively, if the traveling wave double-ended ranging results are consistent with any ranging result, the traveling wave double-ended ranging is selected as a final ranging result, if the traveling wave double-ended ranging results are inconsistent with any ranging result, the ranging result with the largest error in the four ranging results is removed, two nearest ranging results in the rest three ranging results are selected to obtain an average value, and the average value is used as the final ranging result;
a traveling wave module:
carrying out fault detection on the collected traveling wave data, and judging whether traveling wave starting is carried out or not;
responding to the traveling wave starting and receiving a protection starting signal, calculating the traveling wave head moment according to protection phase selection, and sending the traveling wave head moment to a protection module; wherein, the protection phase selection is A phase, and then the phase mode is selected in the traveling wave rangingaCalculating; protecting the selected phase as B phase, and selecting phase modebCalculating; protecting the selected phase to be C phase, and selecting phase modecCalculating; if the protection phase selection is AB phase, selecting a line mode alpha for calculation; if the protection phase selection is BC phase, selecting a linear mode beta for calculation; and if the protection phase selection is the CA phase, selecting a linear modulus gamma for calculation.
5. The line protection traveling wave ranging apparatus according to claim 4, wherein: the traveling wave parameter is traveling wave speed, and the function of protection module still includes: and in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, calculating the traveling wave speed according to the length of the line and the traveling wave head moments at two ends of the line, and using the traveling wave speed for the subsequent traveling wave distance measurement calculation.
6. The line protection traveling wave ranging apparatus according to claim 4, wherein: the traveling wave module comprises a first ADC, a first FPGA and a first DSP;
a first ADC: sampling traveling wave data according to the sampling frequency;
a first FPGA: sending sampling frequency to the first ADC, receiving sampled traveling wave data and sending the sampled traveling wave data to the first DSP;
a first DSP: receiving sampled traveling wave data to perform fault detection, and judging whether traveling wave starting is performed or not; and responding to the traveling wave starting and receiving a protection starting signal, calculating the traveling wave head moment according to protection phase selection, and sending the traveling wave head moment to the protection module.
7. The line protection traveling wave ranging apparatus of claim 5, wherein: the protection module comprises a second ADC, a second FPGA and a second DSP;
a second ADC: sampling power frequency data according to the sampling frequency;
a second FPGA: sending out a sampling frequency to a second ADC;
a second DSP: receiving sampled power frequency data, carrying out fault detection, and judging whether protection starting is carried out or not; responding to the protection starting, sending a protection starting signal to the traveling wave module, and performing protection ranging; receiving a traveling wave head moment started by a traveling wave and sending the traveling wave head moment to the opposite end of the line; receiving the traveling wave head time of the opposite end of the line, and performing traveling wave ranging according to the traveling wave head time of the local end, the traveling wave speed and the traveling wave head time of the opposite end of the line; comparing all the ranging results, and selecting the optimal ranging result as a final ranging result; and in response to the fact that the fault is detected to be located outside the area or caused by manual switching-on, calculating the traveling wave speed according to the length of the line and the traveling wave head moments at two ends of the line, and using the traveling wave speed for the subsequent traveling wave distance measurement calculation.
8. The line protection traveling wave ranging apparatus according to claim 7, wherein: the second DSP communicates with the peer through the OTM plug-in.
9. The line protection traveling wave ranging apparatus according to claim 7, wherein: and all data generated by the traveling wave module and the protection module are stored in the ARM through the second FPGA to form a traveling wave recording file.
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| CN201910976745.4A CN110888014B (en) | 2019-10-15 | 2019-10-15 | Line protection traveling wave distance measurement method and device |
| PCT/CN2019/120476 WO2021072913A1 (en) | 2019-10-15 | 2019-11-25 | Line protection traveling wave distance measurement method and apparatus |
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| CN111679153A (en) * | 2020-06-16 | 2020-09-18 | 南京南瑞继保电气有限公司 | Power distribution network fault location method and system and integrated traveling wave location device |
| CN113406441B (en) * | 2021-07-27 | 2022-07-05 | 天津大学 | Flexible direct-current power grid fault location method based on clustering and iterative algorithm |
| CN114089104B (en) * | 2021-11-12 | 2022-12-09 | 西安交通大学 | Fault direction judging method and system based on line boundary line side voltage |
| CN114675227A (en) * | 2022-04-06 | 2022-06-28 | 昆明理工大学 | Method for checking traveling wave recording integrated device based on measured data reconstruction |
| CN117031382B (en) * | 2023-10-10 | 2024-02-20 | 云南电力试验研究院(集团)有限公司 | Single-ended traveling wave device verification method based on signal-to-noise ratio and sine fitting method |
| CN117728586B (en) * | 2024-02-07 | 2024-05-07 | 南方电网数字电网研究院股份有限公司 | Fault traveling wave identification method and device based on power special main control chip |
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| SE442920B (en) * | 1984-06-15 | 1986-02-03 | Asea Ab | METHOD AND DEVICE FOR DETECTION AND LOCATION OF A FAILURE ON A POWER CORD |
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