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Technical Assessment for the Installation of Dispersed Generation in Distribution Networks

Technical Assessment for the Installation of Dispersed Generation in Distribution Networks. N. Kagan, C.C.B. Oliveira, J.C.B. Silva Enerq/University of São Paulo C. R. Benedik, A. Conceição Elektro – Eletricidade e Serviços SA. Objectives.

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Technical Assessment for the Installation of Dispersed Generation in Distribution Networks

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  1. Technical Assessment for the Installation of Dispersed Generation in Distribution Networks N. Kagan, C.C.B. Oliveira, J.C.B. Silva Enerq/University of São Paulo C. R. Benedik, A. Conceição Elektro – Eletricidade e Serviços SA

  2. Objectives • Assessing the impact of new DG units in Distribution Systems • Power flow study • Short circuit study • Consideration of subtransmission and primary distribution networks

  3. DG units in the Distribution System

  4. Power Flow Study • Subtransmission networks • Newton Raphson Method • Medium voltage networks • Radial/three-phase load flow method • Integration of above methods

  5. Subtransmission Networks - Swing bus (or slack bus): voltage magnitude and angle are known (multiple supply busses connected the transmission grid). - PV or generation bus: active power and voltage magnitude are known (representing DG units). • PQ or load bus: active and reactive power are known.

  6. Newton Raphson Formulation Reactive power are then obtained in DG units to be used as an input to MV network load flow

  7. Medium Voltage Networks • Radial networks (usually) P+jQ

  8. Medium Voltage Networks • Three-phase modelling • Load flow is based on ordering network busses and branches Network branch

  9. Short Circuit Calculations Complete network Equivalent network

  10. Short Circuit Calculations

  11. Computational System • Integrated (subtransmission + primary distribution network) analysis • Interface with the company’s corporative data base • Friendly user interface

  12. Subtransmission network

  13. Primary Distribution Network Network reduction

  14. Load flow study

  15. Short circuit study

  16. Conclusions • computational tool to evaluate technical aspects related to the installation of DG units in electric power distribution systems • DG units in the reduced MV network for conventional load flow and short circuit methods • DG injected power flows are determined for different load levels and the MV network is analysed in detail by a specifically designed three-phase load flow algorithm

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