Intelligent distribution substation improves power quality

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Intelligent Distribution Substation improves
power quality
Irina Melnik the Netherlands Session S2 0665
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Need for new technologies
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Intelligent distribution substation (IntDS)

• Developed by a consortium of Dutch industries

• Installed and tested in the grid of DSO Alliander

• Additional functions of the IntDS
• Monitoring
• Control
• Improving Power Quality

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Intelligent components of IntDS
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IntDS implementation

• District with large amount ofmicro Combined Heat
  Powerat customers

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Test program
Power Quality improvement by the IntDS

• Voltage control
• Reduction of harmonic distortion
• Reduction of flicker
• Mitigation of voltage dips

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Voltage control

• Performed by Smart Transformer
• Electronic tap changer ensuresa constant voltage
  level on the LV rail of the IntDS.
• The voltage control set-pointhas to be
  determined to achievethe optimal voltage level
  on PCCsof all LV customers.

Smart Transformer
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Voltage control test results
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Harmonic distortion reduction

• Performed by ESI(Electricity storage inverter)
• Resistive harmonic damping
• Passive harmonic dampingThe filter capacitors of
  the ESI take part in the filtering of harmonics.

Electricity storage systemwith bidirectional
inverter
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Harmonic distortion reduction test results
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Voltage dips mitigation

• Can be performed bythe Smart Transformerthe
  ESI (Electricity storage inverter)
• Voltage dips occur only a few times per yearon
  an LV bus-bar of Dutch distribution
  substations.Thats why this functionality is not
  actively tested.

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Flicker reduction (LV side)

• Performed by
• The electronic tap changer of the Smart
  Transformer
• The flicker reduction control of the
  bidirectional inverter (ESI) of the storage
  system.

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Flicker reduction test results
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Conclusions

• The Intelligent substation has proved to be safe
  in operation.
• The first field test results demonstrate a
  significant reduction of voltage variations,
  harmonic and THD levels both at the LV bus-bar of
  the IntDS and at the LV customers.
• Further metering and test programs will be
  performed to set optimal set-points for control
  equipments.
• The proved principles can be used for areas with
  high levels of PQ distortions.

Irina Melnik the Netherlands Session S2 0665