Distributed Power Systems

ELCT 908

Instructor: Prof. Yasser G. Hegazy

Email: Yasser.higazi@guc.edu.egOffice: C3, #319

The Course

1. This course introduces IET students to an important engineering topic that’s closely related to their field in real life.

2. Students learn electric power engineering concepts and develop technical expertise in this specialized field.

Power Systems

Power systems are responsible for generating

electrical power, transmitting this power and then distributing it to customers at voltage levels and reliability that are appropriate to various users.

System Layout

Generation

Transmission

Distribution

Customer Service

Different Technologies

Extra High Voltage

Medium and Low voltage

Directions of Research

Power system analysis. Power system planning. Power system control. Power system protection. Power quality. Load management. Distributed generation.

Structure Of The Course

Modeling of system Components

Three Phase andPer-unit systems

System Analysis and Control

System Protection

Course Syllabus

Introduction. [1 lecture ] Modeling of Power system components. [3 lectures] The Per- unit system. [1 lecture ] Power flow analysis and control. [2 lectures] Short circuit analysis [2 lectures] System protection [1 lecture ] Distributed Generation. [1 lecture ]

Marking Scheme

Quizzes (Best 2 of 3) 10Tutorial Assignments 10Reports 15Mid Term Examination 25Examination and Lab. Final 40Total 100

Schedule of Classes

Lectures: Tuesdays , 3rd slot in H10.

► Instructor office hours every Sunday from 11:00 to 1:00 p.m.

Tutorials : Tuesdays , 5th slot in H10 .

References

1. “Electrical Energy Systems”, Mohamed El-

Hawary, CRC Press 2000, ISBN 0-8493-

2191-3.

2. “AC Power Systems Handbook”, Jerry

Whitaker, CRC Press 1999, ISBN 0-8493-

7414-6.

3. Journals and Conferences papers.

Overview

What is a Power System?

What is the function of the system?

Power system includes all parts of an electric system power sources and customers.

The Function of the system is to generate power , transmit this power and to distribute it to customers at voltage levels and reliability that are appropriate to various users.

Thermal Power Station

Gas Power Station

Hydraulic Power Station

System Components

What are the main component of a power system?

Generation plants

HV Substations

Transmission Lines

Bulk power Substations

Distribution system

Single Line Diagram

Voltage levels

Generation: 1kV-30 kV EHV Transmission: 500kV-765kV HV Transmission: 230kV-345kV Subtransmission system: 69kV-169kV Distribution system: 120V-35kV

Overview

Power plants convert the energy stored in the fuel or hydro into electric energy.

The energy is supplied through step-up transformers to the electric network.

Power systems are comprised of 3 basic electrical subsystems.

Generation subsystem Transmission subsystem Distribution subsystem

High Voltage Network

High-voltage networks, consist of transmission lines, connects the power plants and high-voltage substations in parallel.

This network permits load sharing among power plants

The typical voltage of the network is between 240 and 700 kV.

The high-voltage substations are located near the load centers.

Subtransmission Network

The subtransmission system connects the high-voltage substations to the distribution substations.

The typical voltage of the subtransmission system is between 138 and 69 kV.

In high load density areas, the subtransmission system uses a network configuration that is similar to the high voltage network.

In medium and low load density areas, the loop or radial connection is used.

Distribution Network

The distribution system has two parts, primary and secondary.

The primary distribution system consists of overhead lines or underground cables, which are called feeders.

The feeders supply the distribution transformers that step the voltage down to the secondary level.

The secondary distribution system contains overhead lines or underground cables supplying the consumers directly by single- or three-phase power.

One Line Diagram