A Static Equivalent Model of Natural Gas Network for Electricity–Gas Co-Optimization

Abstract

For the privacy concern, the data exchange between the electricity network and the natural gas network is not always possible. It brings challenges for the co-operation of electricity-gas systems. This paper proposes a static equivalent model that replaces the natural gas network, which lays the foundation for electricity-gas co-operation between separate electricity and gas companies. The influence of the natural gas network on the electricity network is represented in this equivalent model, which consists of a constraint equivalent model and a loss equivalent model. In the constraint equivalent model, a set of optimization models is formulated to approximate the feasible region of natural gas-fired units (NGUs) imposed by the operational constraints of the natural gas network. In the loss equivalent model, the natural gas consumption of compressors contributed by NGUs is considered based on the “shortest path principle” using the gas loss as the weight. The proposed static equivalent model is applied in the optimal power flow of electricity-gas systems. Case studies demonstrate the desired accuracy of the proposed method.