Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May 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

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Objectives Assessing the impact of new DG units in Distribution Systems Power flow study Short circuit study Consideration of subtransmission and primary distribution networks

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May DG units in the Distribution System

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

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May 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.

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

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

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

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Short Circuit Calculations Complete networkEquivalent network

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Short Circuit Calculations

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

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Subtransmission network

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Primary Distribution Network Network reduction

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Load flow study

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May Short circuit study

Nelson Kagan BR Session 4 – Block 3 – Planning – Paper #66 Barcelona May 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