Scheduling of hydrothermal power systems

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:5676502

Yan, Houzhong; Luh, P B; Guan, Xiaohong ^[1]; Rogan, P M ^[2]

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1. Univ. of Connecticut, Storrs, CT (United States)
2. Northeast Utilities Service, Berlin, CT (United States)

This paper presents a method for scheduling hydrothermal power systems based on the Lagrangian relaxation technique. By using Lagrange multipliers to relax system-wide demand and reserve requirements, the problem is decomposed and converted into a two-level optimization problem. Given the sets of Lagrange multipliers, a hydro unit subproblem is solved by a merit order allocation method, and a thermal unit subproblem is solved by a merit order allocation method, and a thermal unit subproblem is solved by using dynamic programming without discretizing generation levels. A subgradient algorithm is used to update the Lagrange multipliers. Numerical results based on Northeast Utilities data show that this algorithm is efficient, and near-optimal solutions are obtained. Comparing with the authors previous work where thermal units were scheduled by using the Lagrangian relaxation technique and hydro units by heuristics, the new coordinated hydro and thermal scheduling generates lower total costs and requires less computation times.

• OSTI ID: 5676502
• Journal Information: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (United States) Vol. 8:3; ISSN ITPSEG; ISSN 0885-8950
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240100* -- Power Systems-- (1990-)
DEMAND
ENERGY SYSTEMS
FUNCTIONS
HYDROELECTRIC POWER PLANTS
LAGRANGIAN FUNCTION
OPTIMIZATION
PLANNING
POWER DEMAND
POWER GENERATION
POWER PLANTS
POWER SYSTEMS
SCHEDULES