Wind turbine modelling for grid code analysis

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Wind turbine modelling for grid code analysis
Alan Mullane Mark OMalley Electricity Research
Centre (ERC) http//ee.ucd.ie/erc/
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Grid code - Fault ride through

• Stay connected in shaded region
• Provide active power in proportion to retained
  voltage
• Maximise reactive current to transmission NW for
  at least 600ms or until voltage recovery
• Provide 90 of max achievable power within 1s of
  recovery

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Grid code wind model

• Wind farm model designed according to grid code
  specifications
• Comparison with 300MVA conventional plant
• Steam turbine with governor
• IEEE Type 1 Exciter model
• Round rotor synchronous machine
• Response to fault on 220kV Transmission System

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Voltage comparison for conventional 300MVA
station and wind power station (20kV Bus)
Wind
Voltage (pu)
Conventional
Time (s)
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Reactive Power comparison for conventional 300MVA
station wind power station
Conventional
Reactive Power (MVAr)
Wind
Time (s)
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Conclusions

• Wind grid codes difficult to design
• Dynamic models which map wind grid codes are
  useful for code refinement
• No mapping of physical characteristics
• Use with care
• Not suitable for connection studies
• Generic approach should nonetheless be considered