Multi-objective Optimal Load Distribution Based on Decomposition-Coordination Method of Large Scale Systems

摘要

This paper divides a model of complicated system which includes numbers of fossil-fueled power plants into a two-tier structure model with coupled subsystems, using decomposition-coordination method of large scale systems. The method consists of Lagrangian relaxation, sub-gradient algorithm and particle swarm optimization (PSO). First, an optimal load distribution model on economy and pollution is proposed. Second, the model is decomposed via Lagrangian relaxation, and PSO is adopted to obtain the optimal solution of each subsystem. Third, the sub-gradient algorithm is used to update the Lagrangian multiplier to coordinate the coupling relation among subsystems. Finally, through iteration of sub-gradient algorithm and PSO, the simulation example realizes the goal that the power plants can obtain the maximum economic efficiency in the case of the minimum pollutant emissions.