Research on Interaction and Coupling of Various Energy Flows in Micro Energy Internets

Abstract

Multi-Energy Flow (MEF) system is the physical core of Micro Energy Internets (MEIs). Steady-state and dynamic coupling among different energy networks and devices are new characteristics of future energy systems. As the basis of many problems, increasing attention are paid to it. This paper proposes a timescale-based qualitative description method of the dynamic coupling of state variables, after discussing the dynamic processes occurred in an MEF system. A model of microturbine generation system (MTGS) is built in PSCAD / EMTDC for a dynamic simulation to illustrate the proposed method. Furtherly, the simulation shows that the power grid and the fuel network is decoupled over a 10ms timescale, and coupled over a 1s timescale.