Sensitivity coordination method for hierarchical optimization of economic dispatching of hydrothermal power system

The method of coordination level of hierarchical structures for non-linear large system is studied. The dual decomposition method has been considered more efficient for optimization problem of hydrothermal power systems. But the method applied to the λ coordination level influences the convergence rate very much. Therefore, a sensitivity coordination method is presented instead of the conventional subgradient algorithm, and a new concept of the sensitivity relating to the output of lower-level subsystems versus coordination variable is developed. The convergence rate can be accelerated. This method has been applied to the economic dispatching software package for a large hydrothermal power system, including the pumped-storage station and unit commitment, and its effectiveness has been verified.