Research on Optimal Configuration of Energy Hub Considering System Flexibility

Abstract

The energy hub with renewable energy integrated with cold, heat, electricity and gas can improve energy efficiency, demand side flexibility and environmental benefits. To deal with the fluctuation of net load and promote the accommodation of renewable energy, an optimal configuration scheme of energy hub considering system flexibility is presented. In this paper, the mathematical model of the energy hub structure considering the integrated demand response is firstly established. Then, the flexibility demand of the energy hub is obtained according to wind power output, photovoltaic output and load characteristic curves of typical days in different seasons. Meanwhile, two sets of flexibility indexes, system upward/downward flexibility supply and upward/downward system flexibility potential, are proposed. Furthermore, an optimal capacity configuration model of energy hub aimed at annual total cost consisting of economic cost, inadequate system flexibility penalty cost and environmental protection cost is established. In this model, the system flexibility adequacy constraints are introduced and integrated demand response is taken into account. Finally, different energy supply modes and demand response strategies under flexibility adequacy constraints are simulated and analyzed. The results show that the integrated demand response can significantly improve the economy of the configuration scenarios, and the proposed model can effectively improve the flexibility of the integrated energy system.