WSCSWireless Substation

Control System

WSCS Team

Faculty Advisor - Dr. Pat DonohoeTeam Leader - Randall HandTeam Members - Dontrae Caldwell

Chris TaylorMichelle Davis

Background

Mid 1960’s - Began to install simple EMS (Energy Management Systems)

Early 1980’s - Technology of microprocessors was implemented in the metering and control of substations

Current Implementations

High speed land leased lines High power radio Power carrier communications

Problems:

•Expensive

•Require Custom Hardware

•Difficult to use and maintain

Problem

The existing automated systems used to monitorand control devices in substations are extremely expensive and complicated.

The Solution

Wireless Substation Control System

Wireless communication in the substation Substation Device Interface - “user-friendly”

Some Design Concerns

Cost Speed Power Reliability Easy use & configuration Easy installation & upgrade

Wireless Solution

Satellite TechnologyShort-range Wireless

Within the last decade, they have become more reliable and cost effective.

WSCSHardware Components

PC

Server

LEO Satellite Transponder

Power UtilityEquipment

Transmitter - Receiver

WSCSSoftware of the System

Host Software

Linux

PHP

Apache Web Server

mySQL

Sendmail & Procmail

Used to control and monitor the system via web page interface

Used to intercept all incoming email destined for the system

Used to store the satellite messages

WSCSSoftware of the System

Receive satellite messages, parsing them, and take appropriate action

Receive signals from devices, building satellite messages, and sending them if necessary

Store all current data points and important program state variables in its flash memory

Transponder softwarewill:

Unilink Wireless Modem

Links power utility equipment to the transponder.

Features:Connects directly to the COM portOperates at 900MHz400 ft. RangeCompact & weather proof

Power Utility Equipment

Monitor data points and operate

critical functions of:Cooper 4c RegulatorsCooper 4c Reclosers

WSCSHardware Components

PC

WSCSHardware Components

PC

Server

LEO Satellite Transponder

WSCSHardware Components

PC

Server

LEO Satellite Transponder

Transmitter - Receiver

WSCSHardware Components

PC

Server

LEO Satellite Transponder

Power UtilityEquipment

Transmitter - Receiver

WSCS

Results: Reliable, prevention outage response strategies Reduce momentary outages React quickly to system disturbances

Future Work

Support additional devicesImplement DNP protocolExpand to other remote monitoring

and control applications

References[1] Marks, John. (1999, November/December) “Substation Monitoring & Diagnostics.” Electrical World, pp. 16-17,

20-21.

[2] Cooper Power Systems. (1999, January/February) “Reliability vs. Liability.” Electrical World, pp. 4-5.

[3] Marks, John. (1999, January/February) “Use of Fiber Optic Cable Grows for T & D Applications.”

Electrical World. pp. 4-5.

[4] Rosi, David - CerlueanTechnology, Inc. (1999 December) “Raising the Service Bar with Wireless Mobile

Communication.” Electric Light & Power, pp. 34-35.

[5] Gordeon, Martin E., John R. Redmon. “Electric Cooperatives and Distribution Automation - A Survey.” 1991

IEEE Rural Electric Power Conference, pp. A1-1 - A1-6.

[6] Landes, Toby. “Load Management using Pole Mounted RTU’s.” 1996 IEEE Rural Electric Power Conference,

pp. A3-1 - A3-4.

[7] Rhyne, V.T. “Field Demonstrations of Communication Systems for Distribution Automation.” Electrical Power Research Institute, 1982.

[8] Bodemann, Leroy J. “The Pre-Implementation Phase of the Gulf States Utilities’ Energy Management

System.” 1982 Control of Power Systems, pp. 17-21.

[9] Ackerman, William J. “Small Substation SCADA Solutions,” 1998 Rural Electric Power conference,

pp.C1-1 - C1-7.

[10] Rudolph, David L. “An integrated Solution to Substation Automation,” 1998 Rural Electric Power Conference, pp. C2-1 - C2-9.

[11] Orbcomm Global Data & Messaging. “Quick Facts.” 21700 Atlantic Boulevard, Dules VA. 1997.

[12] Scientific Atlanta. “Communications and Tracking Systems: Scientific Atlanta LowEarth Orbit Fixed Site Communicator,” 3845 Pleasandale Road, Atlanta GA 1997.

[13] Scientific Atlanta. “East Mississippi Electric Power Association.” 4356 Communications Drive, Norcross GA 1999.

[14] Sakata, Albert T., Smith, Bradford E. “Microprocessor-Based Substation Metering and Control Systems,” 1984 Control of Power System Conference, pp. 10-16.

[15] Wireless Mountain Laboratories, Inc., “Unilink User’s Manual,” 560-A Higuera, San Luis Obispo, CA 93401. Rev 990519

[16] GE Harris, “COOPER 2179 DCA Functional Specification,” Doc. A039-0FS.WES, Version 7.01.