CN104360594A - Method for acquiring trusted time service of extra-high voltage transformer substation - Google Patents
Method for acquiring trusted time service of extra-high voltage transformer substation Download PDFInfo
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- CN104360594A CN104360594A CN201410653556.0A CN201410653556A CN104360594A CN 104360594 A CN104360594 A CN 104360594A CN 201410653556 A CN201410653556 A CN 201410653556A CN 104360594 A CN104360594 A CN 104360594A
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- satellite
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- time service
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R40/00—Correcting the clock frequency
- G04R40/02—Correcting the clock frequency by phase locking
Abstract
The invention provides a method for acquiring a trusted time service of an extra-high voltage transformer substation. The method includes the following steps that S1, time service satellite information is acquired, and the time service satellite information includes a satellite serial number, a satellite ID and a satellite ephemeris message; S2, the time service satellite identity is recognized according to the time service satellite information, time service satellites are determined, and the time service satellites comprise the GPS satellite and the Beidou satellite; S3, the time information of the determined time service satellites is received, the phase of the time information is measured in real time, and the time information with large phase deviation is removed; S4, after the time information with large phase deviation is removed, the remaining time information is receptive time information, the phase of the receptive time information is measured, a time information phase abnormal value is removed again, the phase of the remaining time information is subjected to normalization processing, and non-disturbance time information is output; the non-disturbance time information can be output, and reliable and safe operation of a power grid is guaranteed.
Description
Technical field
The present invention relates to a kind of power domain, particularly relate to a kind of method obtaining the credible time service of ultra-high voltage transformer station.
Background technology
For extra-high voltage grid, the transformer station's very reliability service in electrical network must be guaranteed, once break down, cascading trip, stability disruption will be caused, disintegrate the chain reaction of collapse, cause massive blackout disaster, therefore, the operation of each subsystem to ultra-high voltage transformer station is needed to carry out reliable time unification, guarantee extra-high voltage grid safe and reliable operation.
The time synchronized of traditional extra-high voltage grid adopts gps time or big-dipper satellite time as time base source, that is the synchronous transformer station time is carried out by GPS time service or big-dipper satellite time service, but but there are the following problems: for extra-high voltage grid, there is higher electric pressure, therefore the electromagnetism running environment in transformer station is more complicated, the signal stabilization of time dissemination system is poor, and the reliability of time service is affected, it is high that satellite-based space Service of Timing has time service precision, the advantage that time service scope is large, but satellite system is run by tellurian control land station, the false navigation message of a malice just may bring the large saltus step of a time, thus export the incredible time to extra-high voltage grid, this is unallowed for requiring reliable and stable extra-high voltage grid, particularly in the wartime, satellite deception is the attack means that opponent commonly uses, thus cause the temporal information of satellite time transfer and unreliable, for traditional time synchronism apparatus, although common transformer station can be applicable to, but can not extra-high voltage grid be applicable to.
Therefore, what need to propose a kind of satellite-based space Service of Timing can the method for the credible time service of Obtaining Accurate ultra-high voltage transformer station, can effectively propose on the one hand to obtain false time signal in satellite time information, fraudulent time source is avoided to cause extra-high voltage grid operation troubles, on the other hand, can output time information be stablized, thus ensure extra-high voltage grid safe and reliable operation.
Summary of the invention
The object of this invention is to provide a kind of method obtaining the credible time service of ultra-high voltage transformer station can effectively propose on the one hand to obtain false time signal in satellite time information, fraudulent time source is avoided to cause extra-high voltage grid operation troubles, on the other hand, can output time information be stablized, thus ensure extra-high voltage grid safe and reliable operation.
A kind of method obtaining the credible time service of ultra-high voltage transformer station provided by the invention, comprises the steps:
S1. obtain the information of time service satellite, the information of time service satellite comprises satellite number, satellite ID and satellite ephemeris message;
S2. according to the information of time service satellite, identify the identity of time service satellite, and determine time service satellite wherein, time service satellite comprises gps satellite and big-dipper satellite, and wherein, time service satellite comprises gps satellite and big-dipper satellite;
S3. the temporal information of the time service satellite determined is received, and the phase place of real-time Measuring Time information, reject the temporal information that phase deviation is larger;
S4. after rejecting the large temporal information of phase deviation, excess time, information was the temporal information of receiving, and measured the temporal information phase place of receiving, and again rejected temporal information phase anomaly value, and to excess time information phase place be normalized, export undisturbed temporal information.
Further, in step S1, the ephemeris message of satellite comprises the message kind received and the time of arrival receiving often kind of message and interval time.
Further, in step S3, comprise the steps:
S31. the temporal information of gps satellite and the temporal information of big-dipper satellite is received;
S32. phase measurement is done to the temporal information of gps satellite received and/or the temporal information of big-dipper satellite, and adopt local frequency reference source to be measuring unit and with the phase place of pulse reference time of this locality for fixed phase;
The phase place of the temporal information of the gps satellite S33. obtained side and/or the temporal information of big-dipper satellite compares with fixed phase, reject the temporal information that phase place is outstanding, and the time service satellite determining to send this temporal information is malicious event source.
Further, in step S4, comprise the steps:
S41. phase measurement is carried out to the temporal information of gps satellite of receiving and/or the temporal information of big-dipper satellite, and matching intermediate curve, and reject the temporal information corresponding to the large phase place of phase deviation;
S42. to excess time information phase place be weighted normalized:
Wherein p
ifor the output phase place of moment i, a
kfor the normalized factor of time base source k, p
k,ifor time base source k is in the phase measurement in i moment;
S43. utilize least square method and Kalman filtering algorithm to process normalized temporal information phase place, export undisturbed temporal information.
Beneficial effect of the present invention: method provided by the invention, what the satellite that can identify as time base source exactly sent has fraudulent time message information, and rejected, and can the disturbance temporal information in the temporal information of receiving be proposed effectively, thus export undisturbed temporal information, and then the Complete Synchronization of each subsystem of guarantee ultra-high voltage transformer station, ensure the reliable and secure operation of electrical network.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is process flow diagram of the present invention.
Fig. 2 is the particular flow sheet of step S3 in the present invention.
Fig. 3 is the particular flow sheet of step S4 in the present invention.
Embodiment
Fig. 1 is process flow diagram of the present invention, and Fig. 2 is the particular flow sheet of step S3 in the present invention, and Fig. 3 is the particular flow sheet of step S4 in the present invention, and as shown in the figure, a kind of method obtaining the credible time service of ultra-high voltage transformer station provided by the invention, comprises the steps:
S1. obtain the information of time service satellite, the information of time service satellite comprises satellite number, satellite ID and satellite ephemeris message, and wherein, time service satellite comprises gps satellite or big-dipper satellite, and time service satellite is referred to as time source;
S2. according to the information of time service satellite, identify the identity of time service satellite, and determine time service satellite, wherein, time service satellite comprises gps satellite and big-dipper satellite;
S3. the temporal information of the time service satellite determined is received, and the phase place of real-time Measuring Time information, reject the temporal information that phase deviation is larger, that is, for the time message information that time service satellite sends, the phase place of real-time these temporal informations of measurement, no matter be gps satellite or big-dipper satellite, the temporal information exported should be consistent, the phase deviation of the temporal information of each satellite output is also little in other words conj.or perhaps, the phase place of such as temporal information should concentrate near a certain fixed phase, but for the phase place of respective time information, depart from this fixed phase far away, therefore, rejected, and the temporal information regarded as corresponding to this phase place is false temporal information, temporal information (phase place near fixed phase corresponding to temporal information) for other then regards as the temporal information of receiving,
S4. after rejecting the large temporal information of phase deviation, excess time, information was the temporal information of receiving, the temporal information phase place of receiving is measured, again reject temporal information phase anomaly value, and to excess time information phase place be normalized, export undisturbed temporal information, by the phase measurement to the temporal information of receiving, and after rejecting the temporal information of SPA sudden phase anomalies, can guarantee that the final temporal information exported is undisturbed temporal information, be beneficial to the time synchronized of each subsystem of ultra-high voltage transformer station; Method provided by the invention, what the satellite that can identify as time base source exactly sent has fraudulent time message information, and rejected, and can the disturbance temporal information in the temporal information of receiving be proposed effectively, thus export undisturbed temporal information, and then the Complete Synchronization of each subsystem of guarantee ultra-high voltage transformer station, ensure the reliable and secure operation of electrical network.
In the present embodiment, in step S1, the ephemeris message of satellite comprises the message kind received and the time of arrival receiving often kind of message and interval time, for real each satellite in orbit, owing to being independently smart machine, frequency and the kind of the ephemeris message that it sends earthward have difference, if send undesired signal from the attack equipment on ground, thus the information that compacting normal satellite sends, that is the signal of normal satellite is disturbed, false satellite message is launched to local reception equipment, obviously its statistical property is difficult to imitate true satellite in-orbit completely, therefore, according to these statisticss, the false satellite-signal that major part attack equipment sends is got rid of.
In the present embodiment, in step S3, comprise the steps:
S31. the temporal information of gps satellite and the temporal information of big-dipper satellite is received;
S32. phase measurement is done to the temporal information of gps satellite received and/or the temporal information of big-dipper satellite, and adopt local frequency reference source to be measuring unit and with the phase place of pulse reference time of this locality for fixed phase;
The phase place of the temporal information of the gps satellite S33. obtained side and/or the temporal information of big-dipper satellite compares with fixed phase, reject the temporal information that phase place is outstanding, and the time service satellite determining to send this temporal information is malicious event source.
In the present embodiment, in step S4, comprise the steps:
S41. phase measurement is carried out to the temporal information of gps satellite of receiving and/or the temporal information of big-dipper satellite, and matching intermediate curve, and reject the temporal information corresponding to the large phase place of phase deviation;
S42. to excess time information phase place be weighted normalized:
Wherein p
ifor the output phase place of moment i, a
kfor the normalized factor of time base source k, p
k,ifor time base source k is in the phase measurement in i moment;
S43. utilize least square method and Kalman filtering algorithm to process normalized temporal information phase place, export undisturbed temporal information.
Local frequency reference source in above-mentioned refers to that time synchronism equipment can configure a rubidium atomic clock or at least configure a highly stable crystal, and its can carry a local 10MHz frequency to system.
Local reference pulse: the pulse per second (PPS) 1PPS signal freely shaken produced with local frequency source 10MHz frequency division, this signal is as other outside input pulse benchmark of measurement.
Phase measurement process: for each time base source, it can export a pulse per second (PPS).Utilize the frequency multiplication of local frequency for digit (usual frequency multiplication is to 100MHz), measure the umber of pulse to 100MHz local 1PPS rising edge from tested pulse per second (PPS) rising edge, this numerical value is exactly the phase differential (unit was 10 nanoseconds) measured.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. obtain a method for the credible time service of ultra-high voltage transformer station, it is characterized in that: comprise the steps:
S1. obtain the information of time service satellite, the information of time service satellite comprises satellite number, satellite ID and satellite ephemeris message;
S2. according to the information of time service satellite, identify the identity of time service satellite, and determine time service satellite, wherein, time service satellite comprises gps satellite and big-dipper satellite;
S3. the temporal information of the time service satellite determined is received, and the phase place of real-time Measuring Time information, reject the temporal information that phase deviation is larger;
S4. after rejecting the large temporal information of phase deviation, excess time, information was the temporal information of receiving, and measured the temporal information phase place of receiving, and again rejected temporal information phase anomaly value, and to excess time information phase place be normalized, export undisturbed temporal information.
2. obtain the method for ultra-high voltage transformer station credible time service according to claim 1, it is characterized in that: in step S1, the ephemeris message of satellite comprises the message kind received and the time of arrival receiving often kind of message and interval time.
3. obtain the method for the credible time service of ultra-high voltage transformer station according to claim 1, it is characterized in that: in step S3, comprise the steps:
S31. the temporal information of gps satellite and/or the temporal information of big-dipper satellite is received;
S32. phase measurement is done to the temporal information of gps satellite received and the temporal information of big-dipper satellite, and adopt local frequency reference source to be measuring unit and with the phase place of pulse reference time of this locality for fixed phase.
The phase place of the temporal information of the gps satellite S33. obtained side and/or the temporal information of big-dipper satellite compares with fixed phase, reject the temporal information that phase place is outstanding, and the time service satellite determining to send this temporal information is malicious event source.
4. obtain the method for the credible time service of ultra-high voltage transformer station according to claim 1, it is characterized in that: in step S4, comprise the steps:
S41. phase measurement is carried out to the temporal information of gps satellite of receiving and/or the temporal information of big-dipper satellite, and matching intermediate curve, and reject the temporal information corresponding to the large phase place of phase deviation;
S42. to excess time information phase place be weighted normalized:
Wherein p
ifor the output phase place of moment i, a
kfor the normalized factor of time base source k, p
k,ifor time base source k is in the phase measurement in i moment;
S43. utilize least square method and Kalman filtering algorithm to process normalized temporal information phase place, export undisturbed temporal information.
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| CN107064963A (en) * | 2017-04-13 | 2017-08-18 | 中国人民解放军理工大学 | A kind of detection method of false satellite ephemeris |
| CN107247405A (en) * | 2017-04-14 | 2017-10-13 | 广州北极瑞光电子科技有限公司 | A kind of satellite navigation time service is kept time the solution in clock system |
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| CN104360594B (en) | 2017-03-01 |
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