Harmonic filter design for impact study Filter design electrified - - PowerPoint PPT Presentation
Introduction Harmonic Harmonic filter design for impact study Filter design electrified railways EMT study Conclusion DIgSILENT USER GROUP Sydney 5 September 2013 M Jansen, S Hagaman, T George Introduction Introduction Harmonic
Introduction Harmonic impact study Filter design EMT study Conclusion
Sydney — 5 September 2013
M Jansen, S Hagaman, T George
Introduction Harmonic impact study Filter design EMT study Conclusion
◮ Railway electrification project ◮ Adds significant unbalanced non-linear load to the grid ◮ PowerFactory used for
◮ Harmonic emission/compliance ◮ Filter design/rating ◮ EMT review ◮ Protection design
Introduction Harmonic impact study Filter design EMT study Conclusion
TNSP Network 132 kV RL1 RL2 RL3 HF1 RL4 RL5 RL6 HF2 50 kV (AB) (BC) T1 T2
Note: (AB)/(BC) phasing is typical
◮ Requires single phase compensation ◮ Limited output power
Introduction Harmonic impact study Filter design EMT study Conclusion
Emission limit (% of V1) 0.5 1.0 1.5 Harmonic order THD 7 13 19 25 31 37 43 49
Introduction Harmonic impact study Filter design EMT study Conclusion
Network impedance (Ω) 10 100 1000 Frequency (× 50 Hz) 5 10 15 20 25 30 35 40 45 50
Introduction Harmonic impact study Filter design EMT study Conclusion
Measured Expanded Used Current emission (% of V1) 0.001 0.01 0.1 1 10 Harmonic order THD 7 13 19 25 31 37 43 49
Introduction Harmonic impact study Filter design EMT study Conclusion
PoC voltage distortion (% of V1) 0.001 0.01 0.1 1 10 Harmonic order THD 7 13 19 25 31 37 43 49
Introduction Harmonic impact study Filter design EMT study Conclusion
Shunt Third Fifth Ninth Phase A Phase B From 50 kV switchroom
Introduction Harmonic impact study Filter design EMT study Conclusion
PoC voltage distortion (% of V1) 0.001 0.01 0.1 1 Harmonic order THD 7 13 19 25 31 37 43 49
Introduction Harmonic impact study Filter design EMT study Conclusion
Rating C L Rp Tuned to Branch Type (Mvar) (µF) (mH) (Ω) (Hz) Shunt — 20 — 398 — — Third Single tuned 7 7.92 142 — 150 Fifth Damped 5 6.11 66.3 800 250 Ninth Damped 18 22.6 5.53 50 450
Introduction Harmonic impact study Filter design EMT study Conclusion
Capacitor VN Reactor IRMS Resistor PR (kV) (A) (kW) Third 78.2 178.78 – Fifth 64.8 117.21 16 Ninth 61.0 414.45 80
Introduction Harmonic impact study Filter design EMT study Conclusion
◮ Design for electromagnetic transient (EMT) phenomena
◮ Peak voltage across capacitor banks ◮ Peak currents ◮ Protection setting stability
◮ Studies for switching transients and lightning surges ◮ Specification of mitigation measures
Introduction Harmonic impact study Filter design EMT study Conclusion
TNSP Network 132 kV RL1 RL2 RL3 HF1 RL4 RL5 RL6 HF2 50 kV T1 T2 Stray capacitance Surge arrester
Introduction Harmonic impact study Filter design EMT study Conclusion
◮ Operational scenarios to define different switching
◮ 1 or 2 transformers online ◮ 1 or 2 filters online ◮ Several different track feeder arrangements ◮ Lightning strike points
◮ Study cases for each switching/lightning case ◮ Analysis of different point on wave switching ◮ DPL scripts to automate study cases, print plots and
Introduction Harmonic impact study Filter design EMT study Conclusion
VC3 VC5 VC9 Capacitor voltage (kV) 200 Time (s) 0.02 0.04 0.06 0.08 0.10 I3 I5 I9 Branch current (kA) −1 1 Time (s) 0.02 0.04 0.06 0.08 0.10
Introduction Harmonic impact study Filter design EMT study Conclusion
◮ Switching transient
◮ Surge arresters specified across the 3rd tuned branch
capacitor bank (approaching IEC 60871-1 peak limit)
◮ Overcurrent protection graded to avoid spurious trips on
filter energisation
◮ Lightning surge
◮ Surge arresters specified for the filter busbars
Introduction Harmonic impact study Filter design EMT study Conclusion
175.4 kV
IEC 60871 voltage withstand limit VC3 (kV) −200 200 Time (s) 0.005 0.010 0.015 0.020
Introduction Harmonic impact study Filter design EMT study Conclusion
PoW time 6 ms, Ipeak = -380 A IMOV (kA) −0.4 −0.2 Time (s) 0.005 0.010 0.015 0.020 0.025 0.030
Introduction Harmonic impact study Filter design EMT study Conclusion
Current (kA) 10 Time (ms) −0.1 0.1 0.2 Energy (kJ) 20 Time (ms) −0.1 0.1 0.2
Introduction Harmonic impact study Filter design EMT study Conclusion