Study on energy flow calculation of decomposed method for integrated energy system

Abstract:
The coordinated utilization of various energy sources is an important way of green and low-carbon development. The multi energy flow calculation is the basis of planning, operation, optimization and dispatching in integrated energy system. This paper analyses the trend and existing problems of sequential method from three aspects: energy coupling model, energy flow calculation method and solution tool. Finally, an example is used to show the analysis process. The decomposed method is solved by mature software, the calculation of the subsystem is small, and the practicability is better at present. Energy hub is a powerful tool for coupling component modelling. Mode enumeration method is suitable for systems with simple operation mode. Energy bus is an extension of energy hub method, and other methods are not universal. Newton method is a general method for power, gas and heat network calculation. The advanced power flow algorithm can improve the calculation speed, and the heat and gas loop method can improve the system convergence. The cooperative operation of mature software can improve the efficiency of sequential simulation, and the software interface is the key problem. Finally, the shortcomings of decomposed method are summarized, and the future development is prospected.