Optimal hydro generation and interchange scheduling with flow-dependent channel constraints

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:438714

Grubauer, W ^[1]; Underwood, R; Telgenhoff, M ^[2]; Frowd, R ^[3]

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1. Siemens AG, Vienna (Austria)
2. Seattle City Light, WA (United States)
3. EMCA, Inc., Minnetonka, MN (United States)

This paper describes the mathematical formulation, algorithm and some sample results of the advanced short-term Hydro Scheduling function that has been developed as part of SCL`s new Energy Management System, which has been implemented by Siemens AG. An approach to consider non-linear, non-continuous constraints in linear optimization problems, is presented in this paper. The SCL hydro generation and interchange is scheduled to maximize the profit from buying and selling energy while meeting these hydro operating constraints. This problem has been successfully solved for up to a 168 hour time frame using Mixed Integer Linear Programming (MILP). This method is well suited to solving this optimization problem with the complete set of hydro constraints, including the flow dependent ramp limits. This paper includes some details of results obtained by SCL for some actual operational scenarios, where it can be clearly demonstrated that the new algorithm produces hydro and interchange schedules which maximize the generation over the heavy load hours (in which the energy can be sold at a higher price) and minimize generation over the light load hours while meeting all constraints on the hydro system.

• OSTI ID: 438714
• Report Number(s): CONF-951136--; ISBN 0-7803-2981-3
• Country of Publication: United States
• Language: English

Related Subjects

13 HYDRO ENERGY
24 POWER TRANSMISSION AND DISTRIBUTION
ENERGY MANAGEMENT SYSTEMS
HYDROELECTRIC POWER PLANTS
OPERATION
POWER GENERATION
POWER SYSTEMS