Institute of Electrical Power Systems SMART GRIDS CONSIDERATIONS

Institute of Electrical Power Systems SMART GRIDS – CONSIDERATIONS REGARDING PROTECTION OF ELECTRICAL INSTALLATIONS AND SAFETY IN CASE OF DECENTRALIZED POWER SUPPLY This project is supported by means of the Climatic and Energy Fund accomplished within the framework of the program „NEW ENERGIES 2020“. Dipl. -Ing. Maria Aigner Dipl. -Ing. Christian Raunig Dipl. -Ing. Dr. Ernst Schmautzer Univ. -Prof. Dipl. -Ing. Dr. Lothar Fickert Institute of Electrical Power Systems University of Technology Graz www. ifea. tugraz. at

Institute of Electrical Power Systems Content • Background information • Objectives • Test setup • Neutral point treatment (DG) • Conclusion & Outlook A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 2

Institute of Electrical Power Systems Background • Smart Grids - involvement of distributed (small, renewable) power sources - information- and communications technolgies (ICT) • Increased integration of distributed (renewable) energy systems - reduction of CO 2 emissions - reduction of transmission losses - increased supply security • Smart Grids enable a more - efficient - secure and - ecological power supply A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 3

Institute of Electrical Power Systems Objectives • Bidirectional short circuit currents - changing of the direction and the magnitude - incompatibility of existing protection systems • Neutral point treatment of the decentralized generator (DG) - missing defined neutral point to earth connection (grounding) - defined neutral point to earth connection • Goal: Ø providing of personal safety in each operation mode A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 4

Institute of Electrical Power Systems Test setup A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 5

Institute of Electrical Power Systems Missing neutral point to earth connection of the decentralized source A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 6

Institute of Electrical Power Systems Defined neutral point to earth connection of the decentralized source A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 7

Institute of Electrical Power Systems Conclusion & Outlook • Neutral point treatment (DG) - defined neutral point to earth connection Ø protection devices are speaking sufficient - missing defined neutral point to earth connection Ø protection devices are not speaking sufficient • Operation mode (parallel and islanding) - dimensioning of phase conductor and protective earth conductor - position of fuses - personal safety in case of islanding opertion mode • Experiments in the laboratory • Field tests A Professor Maria Aigner Horst Cerjak, 19. 12. 2005 Maribor, 12. 05. 2010 Komunalna Energetika 8

Institute of Electrical Power Systems SMART GRIDS – CONSIDERATIONS REGARDING PROTECTION OF ELECTRICAL INSTALLATIONS AND SAFETY IN CASE OF DECENTRALIZED POWER SUPPLY Dipl. -Ing. Maria Aigner Dipl. -Ing. Christian Raunig Dipl. -Ing. Dr. Ernst Schmautzer Univ. -Prof. Dipl. -Ing. Dr. Lothar Fickert This project is supported by means of the Climatic and Energy Fund accomplished within the framework of the program „NEW ENERGIES 2020“. University of Technology Graz Institute of Electrical Power Systems Inffeldgasse 18 -I / A-8010 Graz Tel. : ++43/(0)316 / 873 7551 Fax. : ++43/(0)316 / 873 7553 email: http: //www. ifea. tugraz. at http: //portal. tugraz. at