SEL Power System Model

Communication Flow Chart


Sponsors	Schweitzer Engineering Laboratories University of Idaho, College of Engineering
Team Name	Industrial Power Psychiatrists
Duration	Fall 2013 - Spring 2014
Faculty Advisor	Dr. Brian Johnson
Mentor	Scott Manson
Students	Adel Al Mater, David Eldredge, Chris Foiles, Ann McConnell
http://www.selinc.com/en

This project will create a mathematical model of an industrial facility's electrical power system. Schweitzer Engineering Laboratories will donate equipment to this project. The SEL control hardware in conjunction with a Real Time Digital Simulator (RTDS) will simulate faults and load shedding for this industrial power model.

Design Task

Create an industrial power system model with utility inter-tie using RSCAD and Runtime software. Utility and generators will be connected to buses with various loads. The model will be limited by the size and processing power of the Real Time Digital Simulator (RTDS).

The power system will be comprised of the following components:

Combustion Gas Generator
Steam Turbine Generator
Utility Power
Variable Speed Drive (VSD)
Synchronous Motor
Induction Motor
Exciter
Governor
Transformer

Each component will be validated then simulated with RTDS. Once everything is validated, the components will be connected into one system. The system will be validated and controls will be added.

An SEL Real-Time Automation Controller (RTAC) will be used for the control algorithms. This piece of equipment will be connected to the RTDS and RSCAD equipped computer.

Detailed Solution

Industrial Power System

This single line diagram was created in RSCAD 4.0. The RSCAD library had some built-in models we used for components. We had to modify parameters to make the components fit our needs. Other components had to be created by modifying built-in models.

System Monitoring and Manual Controls

This single line diagram is used in RSCAD Runtime 4.0 to control breakers throughout the system. There are various gauges that monitor frequency, voltage, and real and reactive power.

Control Algorithm

This diagram illustrates the control algorithm for the power system. Voltage, frequency and power are monitored at designated breakers. When either parameter falls below a threshold value, the control system checks the values again. If it is still below threshold, then the breaker trips and the rest of the load shedding is engaged. The controls algorithm measures six system parameters:

Imported power
Power consumed by the loads
Utility breaker status
Voltage amplitude
Phase angles
System electrical frequency

These analog signals are fed into functions that output a binary signal to indicate if the system might need to shed load to maintain stability. There are two paths that can trigger load shedding. If the utility breaker opens or imported power goes below a certain threshold, the system checks to make sure that adequate local generation is available to carry the loads. If there is not enough local generation the load shedding algorithm is triggered. This path can act very rapidly, but does not measure all possible failure modes. The second path to trigger load shedding measures voltage, phase balance, and system frequency and triggers load shedding if any are outside normal operating parameters. This second branch typically has a much slower response time than is necessary to prevent system failure in the case of a sudden loss of power.

Validation

Validation reports for each synchronous and induction motor can be viewed at this link [[1]]. This link will connect you with a dropbox folder where the files are kept.

Team Members

Ann, David, Adel, Chris


	*David Eldredge*	Experience: Mechanical Engineering student specializing in instrumentation and controls. Hobbies and Interests: David enjoys a wide variety of games such as board, card, video and table top games. Plan for Future: Obtain a job that will pay well enough to pay for his expensive hobbies.
	Mechanical Engineering Student
	Hometown: Idaho Falls, Idaho
	Email: david.r.eldredge@gmail.com

	*Chris Foiles*	Experience: Electrical Engineering student specializing in power. Interested in being an engineer who works to bridge the gap between engineering design and business implementation. Hobbies and Interests: Chris enjoys hiking, camping, skiing, wake-boarding, and swimming. Plan for Future: Work on the marketing and sales side of engineering at a company involved in electric power distribution. Learn Spanish, Japanese and hopefully additional languages.
	Electrical Engineering Student
	Hometown: Moscow, Idaho
	Email: chrisfoiles@gmail.com
	*Ann McConnell*	Experience: Electrical Engineering student specializing in power and energy systems. Gained research experience with superconductive power leads and fault current limiters through an internship with University of Idaho. Hobbies and Interests: Ann enjoys swimming, knitting, scrapbooking, and hanging out with her daughters. Plan for Future: Begin building a career in electrical engineering upon graduating.
	Electrical Engineering Student
	Hometown: Potlatch, Idaho
	Email: catt0300@vandals.uidaho.edu

	*Adel Al Mater*	Experience: Electrical Engineering student specializing in energy systems, and power protection and automation. Hobbies and Interests: Adel enjoys soccer, hiking, and spending time with his family. Plan for Future: Build a career in power protection and automation in his home country, Saudi Arabia.
	Electrical Engineering Student
	Hometown: Alkhubar, Eastern Province, Saudi Arabia
	Email: alma6471@vandals.uidaho.edu

Meetings

Team Meetings:	Tuesdays at 4:00, GJ 218
Team Workshops with Sponsor:	Thursdays at 6:00, BEL G10

Meeting minutes [[2]] and Design Review notes and Presentations [[3]] available on dropbox.