Model Identification and Equivalence Method for Grid Optimal Operation

Abstract

In this paper, on the basis of simplification idea of external transfer consistence of internal power flow in power grid, the network identification method was used to find the local power grid with equivalent value, and WARD equivalent value was used to equalize the local power grid to the boundary node, because the power transfer relationship between internal nodes and boundary nodes of equivalent power grid is basically consistent, equivalent unit could reflect the overall output characteristics of equivalent power grid, there was no need to concern the power distribution of internal node of equivalent power grid, furthermore, the schedulable capacity and cost curve of schedulable resources of equivalent power grid could be calculated, on this basis, the dispatching optimization of power generation of large power grid were conducted. The example analysis showed that the equivalent method in this paper could maintain higher model equivalent accuracy, and the overall optimal solution of power generation dispatching of large-scale power grid was realized.