Abstract
To alleviate environmental pollution and improve the efficient use of energy, energy systems integration (ESI)—covering electric power systems, heat systems and natural gas systems—has become an important trend in energy utilization. The traditional power flow calculation method, with the object as the power system, will prove difficult in meeting the requirements of the coupled energy flow analysis. This paper proposes a generalized energy flow (GEF) analysis method which is suitable for an ESI containing electricity, heat and gas subsystems. First, the models of electricity, heat, and natural gas networks in the ESI are established. In view of the complexity of the conventional method to solve the gas network including the compressor, an improved practical equivalent method was adopted based on different control modes. On this basis, a hybrid method combining homotopy and the Newton-Raphson algorithm was executed to compute the nonlinear equations of GEF, and the Jacobi matrix reflecting the coupling relationship of multi-energy was derived considering the grid connected mode and island modes of the power system in the ESI. Finally, the validity of the proposed method in multi-energy flow calculation and the analysis of interacting characteristics was verified using practical cases.
Highlights
The energy industry has gone through great change due to the rapid development of technology and the economy in the 21st century
When the energy systems integration (ESI) 2power system operates in grid connected mode, node EB13 is connected to the bulk power gridWhen as the node. system
This paper proposed a generalized energy flow analysis method in energy systems integration
Summary
The energy industry has gone through great change due to the rapid development of technology and the economy in the 21st century. Different energy systems are designed, planning and operating independently of the traditional style, which separates the coupling correlations between different types of energy and largely limits the flexibility of the energy system. In this case, ESI is proposed as it is an important type of new energy system, and covers electric power, heat and natural gas systems with the purpose of coordinating the whole system in the processes of generation, transmission and consumption, which are considered to be the core technology of the “third industrial revolution” [1]. The development of an integrated modeling and analysis framework for ESI represents an essential need for future research.
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