CN103236916B - Digital relay protection device SV networking access network time delay dynamic compensation method - Google Patents

Abstract

The invention discloses a kind of method of accurate Calculation SV network delay, overcome the uncertainty of the network delay that SV data cause after switch transmission.Utilize the accurate clock synchronization protocol of optical fiber B coded signal or IEEE1588 Digital reference service, calculate the actual time delay that SV data cause after Internet Transmission in real time, fast and accurately.SV data after compensation meet the cooperation demand of the different SV access way of optical fiber differential protective between Liang Ge transformer station; comprise: SV networking is point-to-point to SV to SV networking, SV networking, SV networking to multiple combinations such as routine samplings, thus can meet the intelligent substation transformation of different phase and the engineering demand of newly-built intelligent substation.

Description

Digital relay protection device SV networking access network time delay dynamic compensation method

Technical field

The invention belongs to relaying protection and automatic field in intelligent substation; being specifically related to a kind of solution when the network delay uncertain problem of sampled value SV signal by causing during Internet Transmission, realizing detecting the actual time delay method that SV causes after Internet Transmission in real time, fast and accurately.

Background technology

Since carrying out intelligent station pilot from State Grid Corporation of China in 2008, have passed through the time of nearly 4 years, complete the intelligent station pilot covering full voltage grade (110kV ~ 500kV), intelligent substation work has entered into batch bidding phase, substantially establishes a set of comparatively perfect intelligent substation system.

Process-level network can transmit SV (sampled data value) message, can adopt point-to-point, independence networking or realize message transmissions with the mode of GOOSE common networking.State Grid Corporation of China and Southern Power Grid Company are continuous has mutually put into effect a series of company standard, has carried out specification to process layer SV transmission means.For 220kV and above intelligent station, SV adopts point-to-point mode to transmit substantially; For 110kV electric pressure intelligent station, Guo Wang company substantially also regulation adopts point-to-point mode to transmit, but still defines SV employing Internet Transmission for some provinces and regions digitizing technique standard a nd norms of south electric network.

Process layer SV network construction form has following several: share two net (as shown in Figure 1), the independent two net (as shown in Figure 2) of two cover or two single net (as shown in Figure 3).

Which kind of networking mode no matter SV adopt, and after have passed through switch, causes the transmission delay of SV to have uncertainty, principal element have following some:

(1) the different network delay caused of the switch quantity of cascade is inconsistent, and current standard regulation switch concatenation progression can not more than 4 grades;

(2) the SV transfer of data that causes of exchange fault is uncertain;

(3) network data is abnormal increases, as: the data blocking that network storm causes.

In view of above some, " the normal delay time " of IEC61850-9-2 message ASDU data centralization is insincere, and this value can not be adopted again to carry out compensation of delay.For transformer and bus differential protection; nondeterministic network transmission delay may cause protection act to slow; malfunction can not be caused; and matching problem between station is related to for circuit optical fiber differential protection; if the time delay of both sides truly can not reflect actual conditions; analog quantity then can be caused to occur phase angle difference, and serious conditions can cause malfunction.

Summary of the invention

In order to solve the problem, this application discloses one method fast and accurately, correct each sampled point actual transmissions time delay of detection, carries out time delay dynamic compensation.

The present invention is concrete by the following technical solutions.

SV networking access network time delay dynamic compensation method in intelligent substation, it is characterized in that, described compensation method comprises the following steps:

(1) when merge cells MU receives the pps pulse per second signal PPS of optical fiber B code or IEEE1588 generation, by the Sample Counter smpCnt zero setting in the IEC61850-9-2 message of output;

(2) when protective device receives the PPS signal of optical fiber B code or IEEE1588 generation, minute book apparatus system time T0;

(3) when to receive Sample Counter smpCnt be the message of zero to protective device, minute book apparatus system time T0 ';

(4) to be the actual transmissions time delay of the message of zero be Sample Counter smpCnt: T0 '-T0;

(5) the Sample Counter smpCnt sent for merge cells MU is the theoretical time of the message of n:

Tn=T0+n×250us；

(6) when to receive Sample Counter smpCnt be the message of n to protective device, minute book apparatus system time Tn ';

(7) to be the actual transmissions time delay of the message of n be Sample Counter smpCnt:

Tn’-Tn=Tn’-(T0+n×250us)。

(8) this side protective device is the time delay dTn-n ' of n according to Sample Counter smpCnt, reduce these data produce time true markers, for completing the data syn-chronization with offside GPF (General Protection False.

Another innovative point of the present invention is: the uncertainty overcoming the network delay that SV data cause after switch transmission.Utilize the accurate clock synchronization protocol of optical fiber B coded signal or IEEE1588 Digital reference service, calculate the actual time delay that SV data cause after Internet Transmission in real time, fast and accurately.

SV data after compensation meet the cooperation demand of the different SV access way of optical fiber differential protective between station, comprising:

(1) SV networking is to SV networking;

(2) SV networking is point-to-point to SV;

(3) SV networking is to routine sampling.

Thus the intelligent substation transformation of different phase and the application demand of newly-built intelligent substation can be met.

Accompanying drawing explanation

Fig. 1 is that in prior art, process layer SV shares two net schematic diagram;

Fig. 2 is the independent two net schematic diagram of the two cover of process layer SV in prior art;

Fig. 3 is the two single net schematic diagram of process layer SV in prior art;

Fig. 4 is function application connection diagram of the present invention;

System schematic when Fig. 5 is the present invention couple;

Fig. 6 is B code of the present invention access hardware handles schematic diagram;

Fig. 7 is that Time Transmission of the present invention and time delay calculate schematic diagram.

Embodiment

Below in conjunction with Figure of description, technical scheme of the present invention is described in further detail.

Accompanying drawing 4 is function application connection diagrams of the present invention, and in figure, M, N are that CSC-103 high-voltage line protection device is all installed at two ends, and protection is connected with adopting optical cable between communication terminal device.Protection sidelight terminal is contained on the backboard of protective device.For N cover be digitized sampling, M cover illustrates for routine sampling; the protection of M cover is owing to being sampled as routine sampling mode, and AD is sampled as without time delay, and N cover protects SV data after MU and switch; create network delay, method of the present invention therefore must be adopted to realize both sides data syn-chronization.

Accompanying drawing 5 be the inventive method pair time system schematic; timing device from satellite obtain GPS or dipper system pair time information; and output to protective device in the mode of optical fiber B code, ensure the synchronism between the wall protection at full station, measure and control device and process layer devices.

Accompanying drawing 6 is hardware module schematic diagrames of optical fiber B code of the present invention access protective device; the hardware configuration of optical fiber B code access protective device comprises Ethernet physical interface PHY, on-site programmable gate array FPGA, SV plug-in unit, 485 chips for direction controlling; inventor please write annexation between above element and functional relationship exactly, write the course of work being realized the access of B code by this hardware configuration exactly.This hardware module achieves the reception of IRIGB code, parsing, time adjustment function and pps pulse per second signal PPS and interrupts controlling, and the key step of the hardware module of B code access protective device is as follows:

Ethernet physical layer interface PHY, realize the access of B coded signal and the controlling functions of pps pulse per second signal PPS, ethernet physical layer interface PHY sends the data to SV plug-in unit after stamping time stab information to B coded signal.

Programming logic gate array FPGA realizes data link layer functions, the data transmit-receive completing Ethernet data and the direction controlling exported pps pulse per second signal PPS.

SV plug-in unit completes decoding and the logical process of B coded signal, and B coded signal is converted to absolute time information: date Hour Minute Second, and obtains B code edge second and export PPS pulse per second (PPS) by Ethernet physical interface PHY.

When SV plug-in unit receives PPS pulse signal, obtain system current time index T0, the Time Transmission in Fig. 3 is all based on this time.

Accompanying drawing 7 is that Time Transmission of the present invention and time delay calculate schematic diagram, with Sample Counter SampCnt=0, SampCnt=1

For example calculates real network time delay.

(1) T0: device receives markers when PPS interrupts;

(2) T0 ': device receives the markers of the message of SampCnt=0;

(3) T1: the theoretical markers of the message of the SampCnt=1 of device conversion, T1=T0+1*250us;

(4) T1 ': device receives the markers of the message of sample counter SampCnt=1;

(5) the real network transmission delay of SampCnt=0 is: dT0-0 '=T0 ’ – T0;

(6) the real network transmission delay of SampCnt=1 is: dT1-1 '=T1 ’ – T1=T1 '-(T0+1*250us);

(7) the real network transmission delay of SampCnt=n is: dTn-n '=Tn ’ – Tn=Tn '-(T0+n*250us);

(8) for Fig. 4, N side digitized sampling protection, be the time delay dTn-n ' of n by Sample Counter smpCnt, reduce these data produce time true markers, for completing the data syn-chronization with M side GPF (General Protection False.

Claims (1)

1. sampled data value SV networking access network time delay dynamic compensation method in intelligent substation, it is characterized in that, described compensation method comprises the following steps:

(1) when merge cells MU receives the pps pulse per second signal PPS of optical fiber B code or IEEE1588 generation, by the Sample Counter smpCnt zero setting in the IEC61850-9-2 message of output;

(2) when protective device receives the pps pulse per second signal PPS of optical fiber B code or IEEE1588 generation, minute book apparatus system time T0;

(3) when to receive Sample Counter smpCnt be the message of zero to protective device, minute book apparatus system time T0 ';

(4) to be the actual transmissions time delay of the message of zero be Sample Counter smpCnt: T0 '-T0;

(5) the Sample Counter smpCnt sent for merge cells MU is the theoretical time of the message of n:

Tn＝T0+n×250us；

(6) when to receive Sample Counter smpCnt be the message of n to protective device, minute book apparatus system time Tn ';

(7) to be the actual transmissions time delay of the message of n be Sample Counter smpCnt:

dTn-n’＝Tn’-Tn＝Tn’-(T0+n×250us)；

(8) this side protective device is the time delay dTn-n ' of n according to Sample Counter smpCnt, reduce these data produce time true markers, for completing the data syn-chronization with offside GPF (General Protection False.