[54] POWER CONTROL SYSTEMS AND PROCESSES
[75] Inventors: Edwin Martin Cooley, Rowlett;
Donald Tucker, DeSoto; Ray
Cumpton, Dallas; John Carlson,
Grapevine, all of Tex.
[73] Assignee: Basic Resources, Inc., Dallas, Tex.
[21] Appl. No.: 08/962,309
[22] Filed: Oct. 31, 1997
[51] Int. C I. G05D 11/00
[52] U.S. CI 700/295; 700/286; 700/22
[58] Field of Search 700/22, 286, 295
[56] References Cited
U.S. PATENT DOCUMENTS
4,620,283 10/1986 Butt et al 700/286
5,631,843 5/1997 Munday et al 700/286
5,696,695 12/1997 Ehlers et al 700/295
Primary Examiner—-William Grant
Assistant Examiner—Kidest Bahta
Attorney, Agent, or Firm—Worsham Forsythe Wooldridge
LLP
[57] ABSTRACT
A control system comprises a utility power line; a first meter, a first generator, a second meter and a programmable logic
controller. The utility power line provides power. The first meter is positioned to measure power provided by a utility company via the utility power line. The first generator generates additional power. The second meter is positioned to measure power generated by the first generator. The programmable logic controller is in communication with the first meter and the second meter to receive input information. The programmable logic controller is also in communication with the first generator to selectively control the first generator in response to the input information. The programmable logic controller controls the first generator to keep power provided by the utility company via the utility power line below a first amount at a first time. The programmable logic controller also controls load bearing equipment that consumes the power provided via the utility power line and from the first generator. A process of managing power usage of a plant comprises receiving energy pulses; determining actual kWh being delivered by a utility company, during a demand interval; comparing the actual kWh to a preset kWh amount to determine whether actual kWh is greater than the preset kWh amount; and, if the actual kWh is greater than the preset kWh amount, then reducing the amount of power consumed by load bearing equipment. Also, if the actual kWh is greater than the preset kWh amount, then the process increases power generated a generator.
18 Claims, 5 Drawing Sheets
Microfiche Appendix Included
(3 Microfiche, 153 Pages)
