Transmission flexibility concerned economic dispatch of interconnected power grid

Abstract

The interconnected power grid emerges because of the temporal and spatial difference of power generation and power utilization as well as the precondition of considering the complementary resources, safety and reliability. The economic dispatch of multi-area interconnected power grids can realize the effect in scale economies and mutual complementary cooperation in supporting capacities of frequency and voltage, to achieve a wider range of the optimal allocation of resources. Considering the increasing power grid interconnection in the new situation and the trend of resource allocation in the wide range, this paper proposes the economic dispatch method for interconnected power grid considering transmission flexibility. The bus tearing method is applied to split the interconnected power grid, and the decomposition-coordination model is built based on the alternating direction multiplier method. In addition, the alternating direction multiplier idea is introduced to realize the parallel computation of the economic dispatch of each regional power grid. The calculation results of each area are coordinated by the central coordination unit, and the iterative calculation is carried out alternately until the convergence solution is obtained. Numerical example analysis illustrates the effectiveness and economic benefits of the proposed dispatch method.