14-11-2012, 02:48 PM
Security-Constrained Unit Commitment Based on Hybrid Benders Decomposition and Mixed Integer Non-Linear Programming
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INTRODUCTION
The principal objective of Unit Commitment (UC) in conventional power systems is scheduling the status of generation units in order to serve the load demand at minimum operating cost while all plants and system constraints are met.
While in electricity power market environments the financial aspect is one of the most important objects in the power generation scheduling, while secure operation of the system is the main concern in Independent System Operator (ISO) point of view. Therefore in competitive electricity markets, generation scheduling is determined through a Security Constrained Unit Commitment (SCUC) which provides a financially viable UC that is physically feasible [1].
Decomposition of the problem is a good simplification technique to divide the main complex problem of SCUC into a master problem (UC) and network security check sub-problems [1], [2].
SCUC FORMULATION
The objective of SCUC discussed in this paper is to obtain an UC scheduling at minimum production cost without compromising the system reliability. The reliability of the system is interpreted as satisfying two functions: adequacy and security. In several power markets, the ISO plans the day-ahead schedule using SCUC.
SCUC decomposes the scheduling formulation into a master problem (UC) and a sub-problem based on the Benders decomposition. Sub-problem contains two sub-systems that corresponding to transmission and voltage constraints [1].
CONCLUSION
Security-Constrained Unit Commitment Based on Hybrid Benders Decomposition and Mixed Integer Non-Linear Programming and proposed method are used in this paper. The example on IEEE 30-Bus system showed the effectiveness of the proposed method. Simulation results performed IEEE 30-Bus test system, showed that the proposed methodology can successfully compete with the other methods.