Short-term scheduling of electric power systems under minimum load conditions

Short-term scheduling of electric power systems under minimum load conditions

Thermal unit operating constraints, hydro spill conditions, must-take resources and inflexible demand can all contribute to an electric power system's minimum load, or "backdown", problem's severity. We present two approaches to addressing minimum load constraints in the unit com...

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Bibliographic Details
Published in:IEEE transactions on power systems Vol. 14; no. 1; pp. 280 - 286
Main Authors: Greif, C., Johnson, R.B., Chao an Li, Svoboda, A.J., Uemura, K.A.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01-02-1999
Institute of Electrical and Electronics Engineers
Subjects:
Applied sciences
Chaos
Cost engineering
Costs
Economics
Electric power generation
Electric power systems
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Job shop scheduling
Lagrangian functions
Marketing and sales
Operation. Load control. Reliability
Operational research and scientific management
Operational research. Management science
Power generation economics
Power industry
Power networks and lines
Power system stability
Production systems
Pumps
Scheduling
Scheduling, sequencing
Spills
Thermal loading
Unit commitment
Short term
Agreement
Relaxation
Lagrangian
Electric energy
Theoretical study
Power supply
Energy demand
Minimum energy
Scheduling
Surplus
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Summary:Thermal unit operating constraints, hydro spill conditions, must-take resources and inflexible demand can all contribute to an electric power system's minimum load, or "backdown", problem's severity. We present two approaches to addressing minimum load constraints in the unit commitment problem. The first, traditional approach is to perform a unit commitment without considering the minimum load constraints, and then make the solution feasible by applying a predetermined "noneconomic" backdown order to curtail must-take resources. The second approach considers minimum load constraints as system constraints similar to operating capacity constraints, and characterizes resources to be backed as having both a decremental cost and an incremental value to the system, where these are not necessarily equal and so impact the decision to make economy sales or pump with pumped-storage resources.
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ISSN:0885-8950
1558-0679
DOI:10.1109/59.744544