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Automatic Generation Control for Contract Based Regulation

Abstract

Our project deals with designing an AGC module that can be used as a teaching tool. This includes using current AGC schemes that must analyze the performance of a control area under different operating conditions. This project necessitates that text and diagrams be integrated into a single module. MATLAB will also be used to identify the process’ ability to regulate within NERC guidelines.

Background

Below is a block diagram of a typical AGC controller. The system measures the output of the all electrical generators. It also measures the frequency at a satellite location in the system. Finally, it measures the tie flows between interconnected systems. Taking all those measurements, the AGC calculates the amount of power increase needed at each generator to supply the customer load. The power is increased by opening steam valves at the generator and resetting the governor of the turbine. The process runs continuously in real time.

http://www.hsb.com/thelocomotive/Story/FullStory/TOOPF1.jpg

Proposed Approach

Functional requirements

Automatic generation control is the center control for power output of the generators, and shall have three major requirements:

Frequency: To maintain system frequency at or nearest to 60 Hz

Power Flow: To monitor and maintain a balance of input and output power between control areas

Economic Dispatch: To keep each unit’s generation at the least cost. The economic dispatch calculations must carry out once every few minutes

Technical Approach

This project will require heavy research into automatic generation control. Included in this will be research from the internet, library, and academic writing. The main goal here is to keep the frequency at a nominal value with constraints considerations. The system is receiving input signals from measurements and sending signals to the generators. Steady state differential equation(s) will be derived that describe the relationship between input and output. This equation then can be testing by using SimuLink and MATLAB.

Testing Requirements

The system testing approach shall be based off of the data provided to us the author of Power Generation, Operation, & Control. The tests shall include the discovery of system problems. The testing shall involve system response to a change in frequency. How fast the system can bring the frequency back to nominal with the most economic conditions will be analyzed. Testing of the MATLAB code will be done by the team members.

Power Generation, Operation, & Control Allen J. Wood

Introduction

  • Problem Statement
  • The general problem of this project is to produce a PowerLearn Module for training or educational purposes. A useable model for AGC will be produced. It will be integrate text, diagrams, and MATLAB instructions into a complete learning experience for the reader.
  • Intended Users
    • Electrical engineering student
    • Electrical engineering professors
  • Intended Use
    • Electrical engineering student
    • Electrical engineering professors
  • Assumptions
    • We will assume a model of a combined cycle generation plant
    • A system with a maximum of 3 generators
    • A system comprised of 2 interconnected areas

Deliverables

    • MATLAB Controller
    • PowerLearn Module

Resource Requirement

Personal Effort

Financial Resources

Team Members

Client

Mark Tiemeier Cam Bui

Team Leader Team Member

Electrical Engineer Electrical Engineer

mtiemeie@iastate.edu camqb@iastate.edu

Chanh Bui Peter Rufino

Team Member Team Member

Electrical Engineer Electrical Engineer

bjosh@iastate.edu prufino@iastate.edu

Department of Electrical and Computer Engineering

Iowa State University

Advisor

Gerald Sheble

Professor of Electrical Engineering

gsheble@iastate.edu