Research on stability control strategy of electricity-gas coupling network based on dynamic model of natural gas network

Abstract

With the rapid reform of the terminal energy system, the interdependency between the natural gas and the electricity networks is increasing. Gas-fired generating units can respond quickly to the uncertainty of the output of renewable energy, and cause great fluctuations in the natural gas networks at the same time. Therefore, this paper proposes an effective model and method to analyze the interaction of electricity-gas coupling network dynamically. First of all, this paper improves the partial differential equation model, which becomes a state equation model that can effectively reflect the characteristics of natural gas pipeline ports. Compared with the traditional model, this model can significantly reduce the complexity and calculation. Also, it is more suitable for online analysis of electricity-gas coupling networks. Based on this, taking into account the dynamic characteristics of the compressor, a stabilization control method based on variable compression ratio for the electricity-gas coupling network is proposed, which ensures safe and stable operation of the electricity-gas coupling network. Finally, through the simulation example, the accuracy of the proposed model and the effectiveness of the control method are verified.