Managing Harmonics – a case study Jim Bridgeman pfc engineering Introduction



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Managing Harmonics – A case study Jim Bridgeman PFC Engineering

Introduction

  • Basics of harmonic resonance
  • Effects of harmonic resonance
  • Typical solutions applied to resonant Power Systems
  • Harmonic magnification case study

The Basics of Harmonic Resonance

Effects of Harmonic Resonance

Effects of Harmonic Resonance

Effects of Harmonic Resonance

  • Increased voltage distortion, possibly resulting in equipment malfunction
  • Loss of transformer output due to increased heating
  • Interference with communication systems
  • Premature failure of motors
  • Premature failure of power factor correction capacitors

Typical Solutions Applied to Resonant Power Systems

  • Detuning reactors
  • Partial harmonic filtration
  • Full harmonic filtration

Typical Solutions Applied to Resonant Power Systems – Detuning Reactors

Typical Solutions Applied to Resonant Power Systems – Partial Filtration

Typical Solutions Applied to Resonant Power Systems – Full Filtration

Comparison of Harmonic Resonance Solutions

Comparison of Harmonic Resonance Solutions

Case Study – Harmonic Magnification at a Car Battery Factory

  • Large 5th harmonic magnification excited by 600 kVAr of capacitors
  • Costly installation of detuning reactors appeared to be the only solution
  • A more cost effective solution involving reconfiguration of the existing plant was found

Case Study – Initial System Configuration (Transformer T1)

Case Study – Initial System Configuration (Transformer T2)

  • Nearly all linear loading
  • Significant load damping

Case Study – Effects of 5th Harmonic Voltage Magnification

Case Study – Effects of 5th Harmonic Voltage Magnification

Case Study – Reasons for severity of 5th harmonic voltage magnification

  • High base level of harmonics due to all non-linear load being connected to this supply
  • Connection of plain capacitor banks
  • Total lack of harmonic damping from linear loading

Case Study – Proposed Solution to Problem of Harmonic Magnification

Case Study – Improvement in Harmonic Performance with Re-configured Load

Case Study – Effects of 5th Harmonic Voltage Magnification

Conclusions

  • Harmonic resonance can be caused by connection of Power Factor Correction equipment
  • Various methods of avoiding this scenario involving blocking / filtration systems are available
  • Careful examination of the problem and more appropriate load configuration can provide more cost effective solution to the problem
  • Questions?

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