Stor-Rotliden Transient analysis. 3/31/2017 Chalmers University of Technology, Tarik Abdulahovic

Transcription

1 Stor-Rotliden Transient analysis 3/31/2017 Chalmers University of Technology, Tarik Abdulahovic 1

2 Table of contents Measurements Modelling & Verification Grounding influence Results 3/31/2017 Chalmers University of Technology, Tarik Abdulahovic 2

3 Wind park layout Substation 130/36kV 4 radials at 36 kv Substation Radial A 3/31/2017 Chalmers University of Technology 3

4 Wind park Measurement points At 36kV side of 130/36kV transformer At 36kV side of WT A11 3/31/2017 Chalmers University of Technology 4

5 Voltage and current sensors Expected max voltage (BIL, 150kV) Max current cca 3kA Fastest transients of up to 0.1us rise time (15-20MHz bandwidth) 3/31/2017 Chalmers University of Technology 5

6 System installation WT A11 voltage dividers 3/31/2017 Chalmers University of Technology 6

7 System installation WT A11 Current sensors 3/31/2017 Chalmers University of Technology 7

8 System installation WT A11 Computer & scope 3/31/2017 Chalmers University of Technology 8

9 System installation substation voltage dividers 3/31/2017 Chalmers University of Technology 9

10 System installation WT A11 voltage dividers 3/31/2017 Chalmers University of Technology 10

11 System installation WT A11 Computer & scope 3/31/2017 Chalmers University of Technology 11

12 Oscilloscope interface Program is monitoring trigger chanel and saves data at 40MS/s (80MS/s) at incidents Continous saving of data at intervals at 1-5 min for harmonic analysis. 3/31/2017 Chalmers University of Technology 12

13 Measurement campaign June 2015 Initiall settings showed that sampling speed needs to be increased to max 80MS/s in order to capture the fastest transients!!! 3/31/2017 Chalmers University of Technology 13

14 Measurement campaign June 2015 Initiall settings showed that sampling speed needs to be increased to max 80MS/s in order to capture the fastest transients!!! 4/3/2017 Chalmers University of Technology 14

15 Measurement campaign June 2015 Initiall settings showed that sampling speed needs to be increased to max 80MS/s in order to capture the fastest transients!!! 4/3/2017 Chalmers University of Technology 15

16 Measurement campaign September 2015 Energizing of T1 with 20m cable to substation 3/31/2017 Chalmers University of Technology 16

17 Measurement campaign first results Energizing of T1 with 20m cable to substation 3/31/2017 Chalmers University of Technology 17

18 Measurement campaign first results Energizing of T1 with 20m cable to substation 3/31/2017 Chalmers University of Technology 18

19 Table of contents Measurements Modelling & Verification Grounding influence Results 4/3/2017 Chalmers University of Technology, Tarik Abdulahovic 19

20 Grounding modelling 3/31/2017 Chalmers University of Technology 20

21 Grounding modelling 4/3/2017 Chalmers University of Technology 21

22 Grounding modelling 4/3/2017 Chalmers University of Technology 22

23 0.2537e-3 [uf] 60 [ohm] e-3 [uf] 60 [ohm] Grounding modelling 50mm jordlina 25m i1_left e3 [ohm] i1_right e2 [ohm] e-3 [H] e2 [ohm] e-3 [H] e1 [ohm] e-3 [H] e-3 [ohm] e-5 [H] 4/3/2017 Chalmers University of Technology 23

24 VCB - Modelling 4/3/2017 Chalmers University of Technology 24

25 [ohm] [ohm] 1e6 [ohm] [ohm] Cable and transformer modelling Transformer model includes stray capacitances Cables are modelled using frequency dependent (phase) model BK_T1_130 Vp_T [uf] [uf] [MVA] [kv] / 34.5 [kv] umec #1 #2 1e6 [ohm] 1e6 [ohm] [ohm] Vp_T [uf] A V 20m cable 20m cable 20m cable I_BK_T1_33 BK_T1_33 V_TRV_BK_T [uf] [uf] [uf] V_Sh_T1_ [ohm] + Rg 4/3/2017 Chalmers University of Technology 25

26 Radial A

27 Table of contents Measurements Modelling & Verification Grounding influence Results 4/3/2017 Chalmers University of Technology, Tarik Abdulahovic 27

28 Grounding models comparison 4/3/2017 Chalmers University of Technology 28

29 V [ohm] Grounding transformer comparison 20m cable A V 20m cable I_BK_T1_33 BK_T1_33 20m cable V_TRV_BK_T1 V_Sh_T1_33 + Rg Zig-Zag Transformer abc Ingt BK_G 4/3/2017 Chalmers University of Technology 29

30 Table of contents Measurements Modelling & Verification Grounding influence Results 4/3/2017 Chalmers University of Technology, Tarik Abdulahovic 30

31 Radial energizing 4/3/2017 Chalmers University of Technology 31

32 WT energizing 4/3/2017 Chalmers University of Technology 32

33 WT s closer to substation experience faster transients Fastest transients reach rise times of 100ns and a magnitude of max 2pu Slower transients (3-5us rise time) may reach to about 3.5pu 4/3/2017 Chalmers University of Technology 33

34 Ongoing study Simulation of recorded short circuits that damaged cable terminations Induction generator with added rotor resistance used as WT generator due to complexity of full detail models 4/3/2017 Chalmers University of Technology 34

35

36 Harmonics

37 Lightning strike risk - Lightning strike map Information about lightning strikes was purchased from SMHI SRL 4/3/2017 Chalmers University of Technology 37

38 Lightning strike map Information about lightning strikes was purchased from SMHI 4/3/2017 Chalmers University of Technology 38

39