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OPTIMAL CONTRIBUTION OF DISTRIBUTED GENERATION

OPTIMAL CONTRIBUTION OF DISTRIBUTED GENERATION. IN MEDIUM VOLTAGE GRIDS DURING A FAULT, NOW AND IN THE FUTURE. Alliander: S. van Loon, F. Volberda, F. Provoost Enexis: J. Morren Session 3 – 0092. Introduction. Distribution System Operators (DSO) within The Netherlands:. Session 3 – 0092.

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OPTIMAL CONTRIBUTION OF DISTRIBUTED GENERATION

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  1. OPTIMAL CONTRIBUTION OF DISTRIBUTED GENERATION IN MEDIUM VOLTAGE GRIDS DURING A FAULT, NOW AND IN THE FUTURE Alliander: S. van Loon, F. Volberda, F. Provoost Enexis: J. Morren Session 3 – 0092

  2. Introduction Distribution System Operators (DSO) within The Netherlands: Session 3 – 0092

  3. Introduction Increasing DG in MV-grids: • Connected by step-up transformer • Direct connection MV LV Gen Gen Session 3 – 0092

  4. Introduction Conflicts: • Selective tripping  time grading (>300ms) • Voltage dips  unwanted disconnection of DG • No support grid codes (MV and < 5 MVA) • E.ON grid code FRTHV-grids, <150 ms Session 3 – 0092

  5. Introduction Is there a need for smarter protection schemes in MV-grids? Session 3 – 0092

  6. Present protection scheme • A voltage dip / frequency change  disconnect DG • More DG  more power lost • Over-/under- voltage  damage to equipment Session 3 – 0092

  7. 2F Present protection scheme 150/10 kV substation Example: • 2 phase fault: • DG protection • DSO protection 21 27 27 27 G1 G2 G3 Undervoltage 27 Distance relay 21 Session 3 – 0092

  8. Present protection scheme DG disconnect Fault Example: • Duration fault: 1060 ms Network protection Session 3 – 0092

  9. Present protection scheme Example: • Power swing HV/MV transformer +12 MW -6 MW Session 3 – 0092

  10. Expectations DSO • Stability • Reliability • Fully selective protection scheme: • Safety of personnel • Security of supply • Prevent damage to equipment • Worst case: • Under- and/or over-voltage Session 3 – 0092

  11. DG must stay connected DG must disconnect Non-dedicated feeders Dedicated feeders G1 G2 G3 Smarter grids • A smart grid needs a smart protection Session 3 – 0092

  12. Conclusions • Increasing DG  new protection scheme • Fast disconnection of faults • Shorter voltage dips • Prepare the MV-grid now for future grids • Change protection of dedicated feeders • Allow contribution of large DG Session 3 – 0092

  13. “A smart grid needs a smart protection!” E = M * C2 Energy = Measurement * Control * Communication Session 3 – 0092

  14. Scenario 1 DG must stay connected DG must disconnect Session 3 – 0092

  15. F1 Scenario 1 HV/MV substation Undervoltage 27 27 27 27 G1 G2 G3 Non-dedicated feeders Dedicated feeders Session 3 – 0092

  16. Scenario 2 DG must stay connected DG must disconnect Session 3 – 0092

  17. ? ? ? F1 Scenario 2 HV/MV substation 87 Undervoltage 27 27 27 27 Differential 87 G1 G2 G3 LOM LOM LOM Loss of mains LOM Bi-directional Non-dedicated feeders Dedicated feeders Session 3 – 0092

  18. ? ? F1 Scenario 3 HV/MV substation 87 Undervoltage 27 27 27 27 Differential 87 G1 G2 G3 LOM LOM Loss of mains LOM Bi-directional Non-dedicated feeders Dedicated feeders Session 3 – 0092

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