MELENDEZ_ALPHA5_Q23

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AuthorVilcahuaman.Melendez

CountryPE

SessionV

Block2 Question

23

Barcelona 12-15 May 2003

1

THREE-PHASEDISTRIBUTION POWER FLOW

WITH A

GEOGRAPHIC INFORMATION SYSTEM

Ral

VILCAHUAMN(1,2)Joaquim

MELNDEZ(1)Ivn

MEDINA(3)Josep Ll

DE LA ROSA(1)

(1) Universitat de Girona

Spain

(2) Universidad Nacional

del Centro del Per

(3) IANSA EIRL, Peru


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CountryPE

SessionV

Block2 Question

23


2

INTRODUCTION A software for computing three-phase distributionpower flow(1J, 2J, 3J) has been integrated with aGeographic Information System (GIS) FLUDIS GIS

It takes into account : Lines, transformers, shunt varelements and loads modeled by a load windowconsidering load composition.

FLUDIS GIS has been used for analysis and planning ofdistribution systems.


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CountryPE

SessionV

Block2 Question

23


3

POWER FLOW INDISTRIBUTION SYSTEMS

EDS normally operate in radial configurations.

It makes necessary to consider power flow analysis

with convergence characteristics (speed andreliability).

Some methods:

Ladder

Current Summation

Power Summation(computationally efficient) Maximum error = 10-4


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CountryPE

SessionV

Block2 Question

23


4

Load and loses modelingLoad window Lines: Eq. imp. Transformers

Residential winter load

Incand. Lights

15%

Fluor. Lights

7%

Space Heating

33%

Clothes Dryer

10%

Refrigerator

14%

Elec.

7%

TV

5%

Other

9%

- Overhead and

underground.

- Neutral and grounded

- Series leakage impedance

- Shunt core loss function

User profiles (location, time)

- industrial,

- residential,

- holiday, etc.


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SessionV

Block2 Question

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Load modeling A pictorial (static) representation showing

percentages of the total load has been used. It is

called load window.

Each portionhas its impedance model

Example:Residential winter load

Incand. Lights

15%

Fluor. Lights

7%

Space Heating

33%Clothes Dryer

10%

Refrigerator

14%

Elec.

7%

TV5%

Other

9%


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CountryPE

SessionV

Block2

Question23


6

Lines and cables

Distribution circuits are

modeled per-phase using the

equivalent impedance.

Lines:

overhead and underground. Neutral and grounded are also

considered.


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Author Vilcahuaman.Melendez Country PE Session V Block 2 Question

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7

Distribution Transformers (1J) Loses in single-phase

transformers are represented

by series leakage impedanceand shunt core loss function

on the secondary terminal.

Real and reactive power corelosses in per unit can be

approximated by:

$

$

22

22

)(

)(

VF

core

VCcore

EVDbaseSystem

ratingkVApuQ

BVAbaseSystem

ratingkVApuP

I

I

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


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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.


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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.NOproblem Power

Summation method.


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FLUDIS GIS (III) Power flow example : Power by phase, load factor,

separate losses


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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)


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Load forecasting An hybrid system for

electric load forecasting

using CBR and expertsystem called FUTURA is

connected to FLUDIS GIS


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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

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MELENDEZ_ALPHA5_Q23