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Optimal Contribution of Distributed Generation in Medium Voltage Grids: Current Challenges and Future Solutions

This presentation discusses the role of Distributed Generation (DG) in Medium Voltage (MV) grids, highlighting the challenges such as selective tripping, voltage dips, and inadequate grid codes that impact the reliability of power supply. It advocates for smarter protection schemes to enhance grid stability and safety. As DG integration increases, new protective measures are necessary to manage faults effectively and minimize equipment damage. Preparing MV grids for future demands through enhanced protective measures is essential for a secure and resilient power supply.

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Optimal Contribution of Distributed Generation in Medium Voltage Grids: Current Challenges and Future Solutions

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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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