Optimal Dispatch of Integrated Electricity and Natural Gas Energy Systems with Long-Distance Pipeline Networks

Abstract

With the large-scale application of gas turbines in power system and the development of P2G technology, integrated electricity and natural gas energy systems is the development trend of future. However, in the case of long-distance natural gas network, the dynamic characteristics of natural gas network can’t be neglected in joint dispatch due to the calculation errors under the steady model and the neglect of natural gas network’s storage capacity, which leads to the adjustment space of gas well output to reduce. In order to describe the dynamic characteristics, based on the fluid equations of natural gas flow, the equations are simplified, and in order to avoid the influence of large time step selection on numerical stability, the central implicit difference method is used to difference partial differential equations. Therefore, an optimal dispatch model of integrated electricity and natural gas energy systems with long-distance natural gas network is proposed in this paper. Finally, the rationality and correctness of the proposed model are verified by IEEE-39 nodes and Belgian natural gas 20-node example.