1. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 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. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 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. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 3 DG units in the Distribution System

4. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 4 Power Flow Study Subtransmission networks –Newton Raphson Method Medium voltage networks –Radial/three-phase load flow method Integration of above methods

5. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 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. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 6 Newton Raphson Formulation Reactive power are then obtained in DG units to be used as an input to MV network load flow

7. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 7 Medium Voltage Networks Radial networks (usually) P+jQ

8. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 8 Medium Voltage Networks Three-phase modelling Load flow is based on ordering network busses and branches Network branch

9. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 9 Short Circuit Calculations Complete networkEquivalent network

10. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 10 Short Circuit Calculations

11. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 11 Computational System Integrated (subtransmission + primary distribution network) analysis Interface with the company’s corporative data base Friendly user interface

12. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 12 Subtransmission network

13. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 13 Primary Distribution Network Network reduction

14. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 14 Load flow study

15. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 15 Short circuit study

16. Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona 12-15 May 2003 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