On-Line Digital Computer Application Techniques for Complex Electric System Dispatch

The design, the implementation of, and the operating experience with a large-scale digital computer system used for optimum scheduling and on-line control of a complex hydro-thermal electric utility system is discussed. Dispatch techniques are outlined which produce optimal scheduling of steam, stored hydro, pumped hydro, and run-of-river hydro generation and economy interchange over a 32-hour period with full consideration given to unit selection and pumped hydro storage incremental cost-worth evaluation. Dispatch policy that results in the minimum practical dollars system power source cost within the framework of physical limitations and operational constraints is discussed. Operational features, including dispatcher-computer communication, scheduling program to on-line control program data interface, digital computer-analog load-frequency control interface, alarm-logging-monitoring programs, and off-line study mode programs are discussed.