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Chapter 9 Case Studies

Tutorial on Harmonics Modeling and Simulation. Chapter 9 Case Studies. Contributors: J. Wikston, E. Gunther, and M. Grady. Case 1. Simulation of the potential harmonic impacts caused by DC motor drives of ski lifts in a ski area. Single Line Diagram. Scenarios.

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Chapter 9 Case Studies

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  1. Tutorial on Harmonics Modeling and Simulation Chapter 9Case Studies Contributors: J. Wikston, E. Gunther, and M. Grady

  2. Case 1 Simulation of the potential harmonic impacts caused by DC motor drives of ski lifts in a ski area

  3. Single Line Diagram

  4. Scenarios • Scenario SKIA. No Corrections. • Scenario SKIB. 30° phase shifting transformers added at Apollo and BigBoss ASDs. • Scenario SKIC. Case SKIB, plus 1800 kVAr of filters.

  5. SKIA, Voltage Waveform and Spectrum at Bus #1, Substation 12.5 kV (THDV = 12.2%)

  6. SKIB, Voltage Waveform and Spectrum at Bus #6, Base (THDV = 8.7%)

  7. SKIC, Voltage Waveform and Spectrum at Bus #6, Base (THDV = 2.7%)

  8. Case 2 Harmonics and interharmonics, the filter design, and design verification measurements associated with an industrial load

  9. Introduction • The load and compensation • Measurements • Filter design • Performance measurements

  10. Load and Compensation • 6 pulse load • Characteristic harmonic orders are n*p +/- 1 • Initial design 5th and 7th on MV bus

  11. Measurements - Voltage Distortion

  12. Measurements – 200 ms window

  13. Measurements - Interharmonics

  14. Filter Design • Type of filter • Location of filter

  15. Filter Types

  16. Filter Location • Utility bus • Secondary of customers step-down • Fault level reduced to ½ • Utility bus impedance 100% variation • Secondary of customer step-down 50%

  17. Performance Measurements

  18. Case 3 Analysis of harmonic impacts of variable frequency drives to the system

  19. SuperHarm model one-line diagram

  20. Predicted voltage waveform distortion without filters

  21. Predicted voltage waveform distortion at Bus I with power factor correction capacitors

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