Wireless Substation Control System WSCS Team Dontra Caldwell Team Leader UniLink Modem Chris Taylor I/O board Randall Hand Host Software Michelle Davis Transponder Software Dr. Donahoe Faculty Adviser Design Objectives Cost Speed Accuracy and Reliability Easy to use & configuration Easily installed & upgraded Wireless Solution Satellite Technology Short-range Wireless Modem Within the last decade, they have become more reliable and cost effective. WSCS Hardware Components PC Server LEO Satellite Transponder Power Utility Equipment Transmitter - Receiver WSCS Hardware Components PC WSCS Software 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 incomingdestined for the system Used to store the satellite messages WSCS Hardware Components PC Server LEO Satellite Transponder WSCS Transponder Firmware Receive satellite messages, parse them, and take the appropriate action. Receive signals from devices, build satellite messages, and send them if necessary. Store all current data points and important program state variables in its flash memory. The Transponder will: Transponder Tests Transmission Times Flash Memory Firmware Data compression RS-232 communication interpretation Outgoing message composition Complete Oct. 15 Oct. 30 Transmission Times WSCS Hardware Components PC Server LEO Satellite Transponder Transmitter - Receiver Unilink Wireless Modem Provides a link from the transponder to nearby devices. Features: Connects directly to the COM port Operates at 900MHz 400 ft. Range ?? Compact & weather proof Unilink Tests Maximum Range Distance Orientation Addressing Static Dynamic Complete Oct. 30 Unilink Test Results Maximum range is 255 feet line-of- sight with antennas up. Static Addressing allows exclusive communication. WSCS Hardware Components PC Server LEO Satellite Transponder Power Utility Equipment Transmitter - Receiver Variables being Monitored Voltage Power Supervisory Status Non-Reclose Ground-trip block Instantaneous Current Phase and Neutral Currents Points being Controlled Trip & Close Non-Reclose Ground-Trip Block Alternative Minimum Trip Clear Malfunctions Raise/Lower Tap Position Hardware Interface RS-232 port to Transponder 8 Discrete Inputs 8 Analog Inputs 8 Outputs to Drive Relays Hardware Tests Analog Inputs Conversion Accuracy Firmware Discrete Inputs Logic Levels Dry Contacts Discrete Outputs No Load With Relays RS-232 Port Power Supply Complete Oct. 13 Complete Complete Oct. 16 Complete Oct. 30 Hardware Test Results System Integration Tests Host to Transponder Transponder to I/O Board I/O Board to Device Nov. 8 Future Work Support additional devices. Build a transceiver to replace the Unilink. Expand to other remote monitoring and control applications. Investigate other long range communication systems. Demonstration References [1] Marks, John. (1999, November/December) Substation Monitoring & Diagnostics. Electrical World, pp , [2] Cooper Power Systems. (1999, January/February) Reliability vs. Liability. Electrical World, pp [3] Marks, John. (1999, January/February) Use of Fiber Optic Cable Grows for T & D Applications. Electrical World. pp [4] Rosi, David - CerlueanTechnology, Inc. (1999 December) Raising the Service Bar with Wireless Mobile Communication. Electric Light & Power, pp [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 RTUs. 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, [8] Bodemann, Leroy J. The Pre-Implementation Phase of the Gulf States Utilities Energy Management System. 1982 Control of Power Systems, pp [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. Atlantic Boulevard, Dules VA [12] Scientific Atlanta. Communications and Tracking Systems: Scientific Atlanta LowEarth Orbit Fixed Site Communicator, 3845 Pleasandale Road, Atlanta GA [13] Scientific Atlanta. East Mississippi Electric Power Association. 4356 Communications Drive, Norcross GA [14] Sakata, Albert T., Smith, Bradford E. Microprocessor-Based Substation Metering and Control Systems, 1984 Control of Power System Conference, pp [15] Wireless Mountain Laboratories, Inc., Unilink Users Manual, 560-A Higuera, San Luis Obispo, CA Rev [16] GE Harris, COOPER 2179 DCA Functional Specification, Doc. A039-0FS.WES, Version 7.01.