1. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 1 THREE-PHASE DISTRIBUTION POWER FLOW WITH A GEOGRAPHIC INFORMATION SYSTEM Raúl VILCAHUAMÁN (1,2) Joaquim MELÉNDEZ (1) Iván MEDINA (3) Josep Ll DE LA ROSA (1) (1) Universitat de Girona Spain (2) Universidad Nacional del Centro del Perú (3) IANSA EIRL, Peru

2. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 2 INTRODUCTION A software for computing three-phase distribution power flow(1 , 2 , 3  ) has been integrated with a Geographic Information System (GIS)  FLUDIS GIS It takes into account : Lines, transformers, shunt var elements and loads modeled by a load window considering load composition. FLUDIS GIS has been used for analysis and planning of distribution systems.

3. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 3 POWER FLOW IN DISTRIBUTION SYSTEMS EDS normally operate in radial configurations. It makes necessary to consider power flow analysis with convergence characteristics (speed and reliability). Some methods: –Ladder –Current Summation –Power Summation (computationally efficient) Maximum error = 10 -4

4. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 4 Load and loses modeling Load windowLines: Eq. imp.Transformers Residential winter load - Overhead and underground. - Neutral and grounded - Series leakage impedance - Shunt core loss function User profiles (location, time) - industrial, - residential, - holiday, etc.

5. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 5 Load modeling A pictorial (static) representation showing percentages of the total load has been used. It is called load window. Each portion has its impedance model Example: Residential winter load

6. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 6 Lines and cables Distribution circuits are modeled per-phase using the equivalent impedance. Lines: –overhead and underground. –Neutral and grounded are also considered.

7. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 7 Distribution Transformers (1  ) Loses in single-phase transformers are represented by series leakage impedance and shunt core loss function on the secondary terminal. Real and reactive power core losses in per unit can be approximated by: Typical values of A, B, C, D, E, F are: A = 0.00267, B = 0.734E-9, C = 13.5 D = 0.00167, E = 0.2683E-13 F = 22.74

8. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 8 FLUDIS GIS FLUDIS GIS: Software for planning design and operation study of electrical distribution systems. FLUDIS GIS inegrates software modules in MapInfo, Delphi and MS SQL. Basic features: –Open: input and append data –Data base management –Modular Power flow computing. Network drawing facilities. File manager capabilities. Load forecasting :FUTURA.

9. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 9 FLUDIS GIS (II) FLUDIS GIS has been tested in real networks without problems. It supports until 5000 nodes. Data in GIS should be logically complete. With lines with O Km. NO problem  Power Summation method.

10. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 10 FLUDIS GIS (III) Power flow example : Power by phase, load factor, separate losses

11. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 11 Network data can be actualized when desired without conflicts. The load flow always uses data form the updated Data Base. FLUDIS GIS is used for planning and design: – It incorporates a package for optimal allocation of shunt elements (size, place and control). –FLUDIS GIS is also linked with FUTURA, a load forecasting package. FLUDIS GIS (IV)

12. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 12 Load forecasting An hybrid system for electric load forecasting using CBR and expert system called FUTURA is connected to FLUDIS GIS

13. Author Vilcahuaman.Melendez Country PE Session V – Block 2 – Question 23 Barcelona 12-15 May 2003 13 CONCLUSIONS We report FLUDIS GIS. Integration of the GIS and a three-phase distribution load flow program. Transformer and line losses are identified. State of the Art tool for the analysis, design and planning of electrical distribution systems