CN102904663B - IEC 61850-9-2 standard-based cross-interval point-to-point communication synchronous-sampling method - Google Patents
IEC 61850-9-2 standard-based cross-interval point-to-point communication synchronous-sampling method Download PDFInfo
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Abstract
The invention discloses an IEC 61850-9-2 standard-based cross-interval point-to-point communication synchronous-sampling method which comprises an IEC 61850-9-2 standard-based cross-interval point-to-point communication synchronous-sampling device, wherein the IEC 61850-9-2 standard-based cross-interval point-to-point communication synchronous-sampling device comprises a protection and monitoring device and a plurality of merging units, and the merging units communicate with the protection and monitoring device through a fiber optic Ethernet channel. The method provided by the invention is simple and easy to achieve, and has high practical applicability and good synchronization accuracy, timing synchronization by a GPS (Global Position System) or synchronization by other hardware is not needed, the cross-interval sampling cost is saved, and the safety of a power system is improved.
Description
Technical field
The present invention relates to power system automatic field, particularly a kind of based on the IEC61850-9-2 standard across spaced points point to-point communication synchronous sampling method.
Background technology
The sampled value of the merge cells in intelligent substation/digital transformer substation is all to carry by fiber optic Ethernet at present; when the protection measure and control device will receive data from the merge cells of different interval; just require to carry out synchronously through GPS or other hardware unit across the merge cells at interval; when the GPS synchronizer breaks down, will lose efficacy across the protective device of interval sampling.Not only to increase GPS or other hardware synchronizer across interval sampling, when increasing cost, also stay hidden danger for safe operation of power system.
Summary of the invention
Technical problem to be solved by this invention is, not enough for prior art, provide a kind of simple, be easy to realize, practical and have synchronization accuracy preferably based on the IEC61850-9-2 standard across spaced points point to-point communication synchronous sampling method, saving improves power system security across the interval sampling cost.
For solving the problems of the technologies described above; the technical solution adopted in the present invention is: a kind of based on the IEC61850-9-2 standard across spaced points point to-point communication synchronous sampling method; comprise based on the IEC61850-9-2 standard across the Intelligent protection measuring controller of spaced points point to-point communication synchronized sampling with based on several merge cellses that the fiber optic Ethernet passage sends sampled data that pass through of IEC61850-9-2 standard, the method is:
1) sample data frames from the different interval merge cells that the different fiber ethernet channel is received deposits in its corresponding buffering area, and the time value that sample data frames arrives is preserved;
2) the protection measure and control device according to the sampling time-delay of the time of advent, Internet Transmission time-delay and the merge cells of merge cells sample data frames, calculates the sampling time of this sample data frames in merge cells; Described sampling time computing formula is as follows:
Ts?=?Tr?–?Td?–?Tn，
Tn?=?L?/?M?*?8，
Wherein: Ts: the sampling instant of sample data frames in merge cells; Tr: sample data frames arrives the moment of protection measure and control device; Td: merge cells sampling time-delay; Tn: the Internet Transmission time-delay calculates according to Frame length and network rate; L: sampled data frame length (Byte number); M: Ethernet transmission rate (Bit/s);
3) protect measure and control device to calculate each fiber optic Ethernet passage poor with respect to the sampling time of reference channel, and will the sampling time differ from the difference that converts corresponding sample count value smpCnt1 to; The difference computing formula of described sample count value smpCnt1 is as follows:
Dn?=?Kn?–?Kb?+?(Tsn?–?Tsb)/Fm，
Wherein, Dn: the difference of the sample count value of n passage relative datum passage; Kn: the sample count value smpCnt2 in n passage latest data frame; Kb: the sample count value smpCnt3 in reference channel latest data frame; Tsn: the n passage latest data sampling time of frame in merge cells; Tsb: the sampling time of reference channel latest data frame in merge cells; Fm: the sample frequency of merge cells (Hz).
4) the protection measure and control device is according to the difference Dn of the above-mentioned sample count value smpCnt1 that calculates, calculate the sample count value smpCnt5 of each fiber optic Ethernet passage interpolation sampling point, and find out its position in buffering area, then utilize Lagrangian three point interpolation method to carry out interpolation arithmetic, extract sampled value Vsn, complete sampling process; Described sample count value smpCnt5 computing formula is as follows:
Ksn?=?i?*?(Fm?/?Fs)?+?Dn，
Wherein: Ksn: the sample count value smpCnt5 of the i time resample points of n passage; I: the i time sampling; Fm: the sample frequency of merge cells; Fs: resampling frequency; Dn: the difference of the sample count value of n passage relative datum passage.
Compared with prior art, the beneficial effect that the present invention has is: method of the present invention is simple, be easy to realize, and is practical, and has synchronization accuracy preferably, do not need GPS to the time synchronous or other hardware synchronization, saved across the interval sampling cost, improved power system security.
Description of drawings
Fig. 1 be one embodiment of the invention based on the IEC61850-9-2 standard across spaced points point to-point communication synchronized sampling apparatus structure block diagram;
Fig. 2 is sampling time Ts schematic diagram calculation of the present invention;
Fig. 3 is the difference schematic diagram calculation of sample count value smpCnt1 of the present invention;
Fig. 4 is that sample count value smpCnt5 of the present invention calculates schematic diagram calculation.
Embodiment
As shown in Figure 1, one embodiment of the invention comprises the protection measure and control device and several merge cellses by the fiber optic Ethernet tunneling traffic with described protection measure and control device based on the IEC61850-9-2 standard across spaced points point to-point communication synchronized sampling device.Described protection measure and control device is the HZP500 Intelligent protection measuring controller; Described merge cells model is HZP501.
Method step of the present invention is as follows:
1) sample data frames from the different interval merge cells that the different fiber ethernet channel is received deposits in its corresponding buffering area, and the time value that sample data frames arrives is preserved;
2) the protection measure and control device according to the sampling time-delay of the time of advent, Internet Transmission time-delay and the merge cells of merge cells sample data frames, calculates the sampling time of this sample data frames in merge cells, as shown in Figure 2; Described sampling time computing formula is as follows:
Ts?=?Tr?–?Td?–?Tn，
Tn?=?L?/?M?*?8，
Wherein: Ts: the sampling time of sample data frames in merge cells; Td: merge cells sampling time-delay; Tn: the Internet Transmission time-delay calculates according to Frame length and network rate; L: sampled data frame length; M: Ethernet transmission rate;
3) protect measure and control device to calculate each fiber optic Ethernet passage poor with respect to the sampling time of reference channel, and will the sampling time differ from the difference that converts corresponding sample count value smpCnt1 to, as shown in Figure 3; The difference computing formula of described sample count value smpCnt1 is as follows:
Dn?=?Kn?–?Kb?+?(Tsn?–?Tsb)/Fm，
Wherein, Dn: the difference of the sample count value of n passage relative datum passage; Kn: the sample count value smpCnt2 in n passage latest data frame; Kb: the sample count value smpCnt3 in reference channel latest data frame; Tsn: the n passage latest data sampling time of frame in merge cells; Tsb: the sampling time of reference channel latest data frame in merge cells; Fm: the sample frequency of merge cells.
4) the protection measure and control device is according to the difference of the sample count value smpCnt1 that calculates, calculate the sample count value smpCnt5 of each fiber optic Ethernet passage interpolation sampling point, and find out its position in buffering area, then utilize Lagrangian three point interpolation method to carry out interpolation arithmetic, extract sampled value, complete sampling process, as shown in Figure 4; Described sample count value smpCnt5 computing formula is as follows:
Ksn?=?i?*?(Fm?/?Fs)?+?Dn，
Wherein: Ksn: the sample count value smpCnt5 of the i time resample points of n passage; I: the i time sampling; Fm: the sample frequency of merge cells; Fs: resampling frequency; Dn: the difference of the sample count value of n passage relative datum passage.
In step 4), find the position of interpolation point in its corresponding buffering area according to the Ksn value of each passage that calculates, and extract before and after it sampled value of 3, Y parameter as Lagrangian three point interpolation computing, extract the sample count value smpCnt of 3 of its front and back, as the X parameter of Lagrangian three point interpolation computing, the Ksn value can calculate the sampled value of insertion point as the insertion point X parameter of Lagrangian three point interpolation computing.
Claims (2)
- One kind based on the IEC61850-9-2 standard across spaced points point to-point communication synchronous sampling method; comprise based on the IEC61850-9-2 standard across spaced points point to-point communication synchronized sampling device; describedly comprise the protection measure and control device and several merge cellses by the fiber optic Ethernet tunneling traffic with described protection measure and control device based on the IEC61850-9-2 standard across spaced points point to-point communication synchronized sampling device; it is characterized in that, the method is:1) sample data frames from the different interval merge cells that the different fiber ethernet channel is received deposits in its corresponding buffering area, and the time value that sample data frames arrives is preserved;2) the protection measure and control device according to the sampling time-delay of the time of advent, Internet Transmission time-delay and the merge cells of merge cells sample data frames, calculates the sampling time of this sample data frames in merge cells; Described sampling time computing formula is as follows:Ts?=?Tr?–?Td?–?Tn，Tn?=?L?/?M?*?8，Wherein: Ts: the sampling time of sample data frames in merge cells; Tr: sample data frames arrives the moment of protection measure and control device; Td: merge cells sampling time-delay; Tn: Internet Transmission time-delay; L: sampled data frame length; M: Ethernet transmission rate;3) protect measure and control device to calculate each fiber optic Ethernet passage poor with respect to the sampling time of reference channel, and will the sampling time differ from the difference that converts corresponding sample count value smpCnt1 to; The difference computing formula of described sample count value smpCnt1 is as follows:Dn?=?Kn?–?Kb?+?(Tsn?–?Tsb)/Fm，Wherein, Dn: the difference of the sample count value of n passage relative datum passage; Kn: the sample count value smpCnt2 in n passage latest data frame; Kb: the sample count value smpCnt3 in reference channel latest data frame; Tsn: the n passage latest data sampling time of frame in merge cells; Tsb: the sampling time of reference channel latest data frame in merge cells; Fm: the sample frequency of merge cells.4) the protection measure and control device is according to the difference of the sample count value smpCnt1 that calculates, calculate the sample count value smpCnt5 of each fiber optic Ethernet passage interpolation sampling point, and find out its position in buffering area, then utilize Lagrangian three point interpolation method to carry out interpolation arithmetic, extract sampled value, complete sampling process; Described sample count value smpCnt5 computing formula is as follows:Ksn?=?i?*?(Fm?/?Fs)?+?Dn，Wherein: Ksn: the sample count value smpCnt5 of the i time resample points of n passage; I: the i time sampling; Fm: the sample frequency of merge cells; Fs: resampling frequency; Dn: the difference of the sample count value of n passage relative datum passage; Find the position of interpolation point in its corresponding buffering area according to the Ksn value of each passage that calculates, and extract before and after it sampled value of 3, Y parameter as Lagrangian three point interpolation computing, extract the sample count value smpCnt of 3 of its front and back, X parameter as Lagrangian three point interpolation computing, the Ksn value can calculate the sampled value of insertion point as the insertion point X parameter of Lagrangian three point interpolation computing.
- According to claim 1 based on the IEC61850-9-2 standard across spaced points point to-point communication synchronous sampling method, it is characterized in that, described protection measure and control device is the HZP500 Intelligent protection measuring controller; Described merge cells model is HZP501.
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