Synchrophasors Using eloran Timing Source

Transcription

1 Synchrphasrs Using elran Timing Surce Erik Jhannessen 1, Andrei Grebnev 1, Stephen Bartlett 1, Lingwei Zhan 2, Jiecheng Zha 3, Yilu Liu 2, 3 (1. UrsaNav Inc., 2. Oak Ridge Natinal Labratry, 3. the University f Tennessee, Knxville) Mar. 23, 2017 NASPI Grup Meeting

2 Mtivatin Synchrphasrs highly rely n timing surce Accuracy Reliability GPS Vulnerability Antenna needs clear view f the sky Radi frequency interference Jamming & Spfing System failure 2

3 e-lran Timing System Structure Mdern Cntrl Center Mdern Transmitting Sites Differential Reference Statins ASF Maps Perfrmance Accurate (synchrnized t UTC) Precise with differential crrectins(± 100 ns) Rbust t failures f GPS 3

4 e-lran Timing System Independent f GNSS Traceability t UTC < 50 ns Grund prpagatin All-in-view signal Lran Data Channel (LDC) Very high pwer Hard t spf r jam UN-152A e-lran timing receiver 4

5 Using elran fr FDR Frequency Disturbance Recrder (FDR) A distributin level single-phase synchrphasr Sensr fr Frequency Netwrk (FNET/GridEye) 5

6 Testing System Cmpare elran and GPS Use a Cesium atmic clck as time reference Evaluate the PPS accuracy f GPS and elran Stability: ppm Use FDR fr measurement testing Phase angle accuracy: ± Frequency accuracy: ± 0.5 mhz 6

7 Testing System UTK DEMO BLOCK DIAGRAM GPS FDR #1 ETHERNET 1 PPS ETHERNET FDR #2 DATA 1 PPS UN-152A elran INDEPENDENT GPS MONITOR CESIUM 1 PPS TRIMBLE T/BOLT 1 PPS GPS TIC #1 1 PPS TIC #2 PC PC DATA TO UTK UTK DEMO SET INDEPENDENT eloran MONITOR TIC #3 Nte: Cesium 1PPS is synchrnized t UTC via GPS prir t tests PC 7

8 PPS Accuracy GPS (M12+) Shrt term errr < ± 30 ns Lng term errr < ± 75 ns Lst signal several times elran (UN 152A) Shrt term errr < ± 10 ns Lng term errr < ± 75 ns Nt signal lss 8

9 PPS Accuracy ---Nrth Billerica, MA --- With Differential Crrectins 2014 FRP +/- ne micrsecnd as Y-Axis Perid: Octber Nvember 2016 Distance t XMTR: 310 miles Withut Differential crrectins Mean: Std : 54.6 Max : Min : Perid: Octber Nvember 2016 Distance t XMTR: 310 miles With Differential crrectins Mean: Std : 8.1 Max : 38.0 Min :

10 PPS Accuracy Bangr, ME 2014 FRP +/- ne micrsecnd as Y-Axis Perid: April 2016 Distance t XMTR: 500 miles Mean: ns STD: 69.7 ns Max: ns Min: ns 10

11 PPS Accuracy Ocala, FL 2014 FRP +/- ne micrsecnd as Y-Axis Perid: December 2016 Distance t XMTR: 790 miles Mean: 93.0 Std : Max : Min :

12 Cmparisn: Angle Measurement Angle measurements agree with each ther Difference < (0.08% TVE) Unwrap Angle(radian) Angle Cmparisn f GPS-FDR with elran-fdr GPS lss Unwrap Angle(radian) Angle f GPS-FDR Angle f elran-fdr Angle Cmparisn f GPS-FDR with elran-fdr Angle f GPS-FDR Angle f elran-fdr Time (s) Time (s) Angle difference(degree) Angle difference between GPS-FDR and elran-fdr Time (s) 12

13 Cmparisn: Frequency Measurement Frequency measurements agree with each ther Difference < ±0.5 mhz Frequency(Hz) Frequency Cmparisn f GPS-FDR with elran-fdr GPS lss Frequency(Hz) Frequency f GPS-FDR Frequency f elran-fdr Frequency Cmparisn f GPS-FDR with elran-fdr Frequency f GPS-FDR Frequency f elran-fdr Time (s) Time (s) Frequency difference(mhz) Frequency difference between GPS-FDR and elran-fdr Time (s) 13

14 Summary f Result PPS timing errr f bth GPS and elran with differential crrectins is well belw 100 ns Angle difference between GPS-FDR & elran FDR < (0.08% TVE), within FDR s measurement accuracy Frequency difference between GPS-FDR & elran FDR < ± 0.5 mhz, within FDR s measurement accuracy Timing availability in 3 days GPS-FDR: lst 22 times (ttally 63 min) elran-fdr: n timing signal lss elran PPS lng term stability is gd even at ~800 miles 14

15 Cnclusin elran prvides cmparable PPS fr synchrphasrs Frequency and angle accuracy are cmparable by using GPS and elran elran prvides gd signal availability and stability 15

16 Questins?