Harmonic vsd-lamps

852 views

Published on

PQ Forum 2011 proceedings http://www.leonardo-energy.org/power-quality-forum-2011-tue-eindhoven

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
852
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
32
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Harmonic vsd-lamps

  1. 1. 31/01/2011 Leonardo ENERGY Power Quality Forum 2011 Case study of harmonic current interaction: VSD and Lamps Vladimir Ćuk Eindhoven University of Technology Electrical Energy Systems Introduction Problem outline: • Current transients noticed in the factory lighting system (peaks increasing three times) • A Variable Speed Drive (VSD) is causing voltage notches (voltage harmonics) on the same busbar • Possible resonance?/ Electrical Energy Systems 27.01.2011. PAGE 1 1
  2. 2. 31/01/2011 Schematic diagram/ Electrical Energy Systems 27.01.2011. PAGE 2 Measurement results (1) Current of lamps in phase 1 during one recording/ Electrical Energy Systems 27.01.2011. PAGE 3 2
  3. 3. 31/01/2011 Measurement results (2) Voltage waveform in three regimes/ Electrical Energy Systems 27.01.2011. PAGE 4 Measurement results (3) Current waveform in three regimes/ Electrical Energy Systems 27.01.2011. PAGE 5 3
  4. 4. 31/01/2011 Processed results (1) THDs measured with a PQ analyzer 0 100 200 300 400 500 600 5 50 Voltage THD 4.5 Current THD 45 4 40 3.5 Voltage THD [%] Current THD [%] 3 35 2.5 30 2 25 1.5 20 1 0.5 15 0 100 200 300 400 500 600 Time [s]/ Electrical Energy Systems 27.01.2011. PAGE 6 Processed results (2) THDs calculated over 20 ms periods 0 0.5 1 1.5 2 2.5 3 7 90 Voltage THD 6 Current THD 80 70 5 Voltage THD [%] Current THD [%] 60 4 50 3 40 2 30 1 20 0 10 0 0.5 1 1.5 2 2.5 3 Time [s]/ Electrical Energy Systems 27.01.2011. PAGE 7 4
  5. 5. 31/01/2011 Processed results (3) Voltage harmonics in all three regimes/ Electrical Energy Systems 27.01.2011. PAGE 8 Processed results (4) Current harmonics in all three regimes/ Electrical Energy Systems 27.01.2011. PAGE 9 5
  6. 6. 31/01/2011 Sliding window recursive DFT (1) 29th voltage and current harmonic 3 25 20 2 15 10 29th current harmonic [A] 29th voltage harmonic [V] 1 5 0 0 -5 -1 -10 -15 -2 -20 -3 -25 8 8.5 9 9.5 8 8.5 9 9.5 time [s] time [s]/ Electrical Energy Systems 27.01.2011. PAGE 10 Sliding window recursive DFT (2) 29th voltage and current harmonic 50 40 30 20 Current [A] Current [A] 10 0 -10 -20 -30 4 -40 4 -50 13th 3 3 25th 11th 2 2 23rd 7th 1 19th 1 Time [s] Time [s] 17th Harmonic 0 Time [s] 5th Harmonic 0/ Electrical Energy Systems 27.01.2011. PAGE 11 6
  7. 7. 31/01/2011 Calculated impedance of lamps 0.5 0.45 Load impedance [Ohm] 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 500 1000 1500 2000 2500 frequency [Hz]/ Electrical Energy Systems 27.01.2011. PAGE 12 Laboratory measurements on a lamp (1) Current waveform with a clean voltage/ Electrical Energy Systems 27.01.2011. PAGE 13 7
  8. 8. 31/01/2011 Laboratory measurements on a lamp (2) Current spectrum with a clean voltage 3rd 5th/ Electrical Energy Systems 27.01.2011. PAGE 14 Laboratory measurements on a lamp (3) Simulated low voltage distortion/ Electrical Energy Systems 27.01.2011. PAGE 15 8
  9. 9. 31/01/2011 Laboratory measurements on a lamp (4) Simulated higher voltage distortion/ Electrical Energy Systems 27.01.2011. PAGE 16 Laboratory measurements on a lamp (5) Simulated highest voltage distortion/ Electrical Energy Systems 27.01.2011. PAGE 17 9
  10. 10. 31/01/2011 Harmonic fingerprint of the lamp (1) Voltage – 3rd harmonic Current – 3rd harmonic/ Electrical Energy Systems 27.01.2011. PAGE 18 Harmonic fingerprint of the lamp (2) Voltage – 17th harmonic Current – 17th harmonic/ Electrical Energy Systems 27.01.2011. PAGE 19 10
  11. 11. 31/01/2011 Calculated lamp impedance Measured lamp impedance and a fitted function Fitted curve – C = 47.7 μF/ Electrical Energy Systems 27.01.2011. PAGE 20 Conclusions • Differences in measurements – Scope and PQ analyzer • A parallel resonance is not being excited • Peaks are caused buy harmonic distortion - similar response without notches • These lamps create harmonics, but react linearly to voltage harmonics – parallel capacitance • Solution – electrical separation/ Electrical Energy Systems 27.01.2011. PAGE 21 11

×