Multi-time-scale scheduling of integrated port logistics-energy system considering piecewise linearization of high-order equations

Port area usually possesses a high percentage of fluctuating energy sources (wind turbine and photovoltaic systems and fluctuating load. How to rationally dispatch port resources and arrange equipment operation plan is crucial in the development of environmentally-friendly ports. Producing hydrogen using renewable energy sources is an important technical method to promote the utilization of renewable energy. In order to balance the high electricity consumption and unstable output of renewable energy sources, previous studies have proposed a scheduling model for the port logistics-energy integrated system. However, inaccurate modelling of hydrogen storage devices has impacted the security of system operation. Considering the temperature and pressure of hydrogen in the high-pressure hydrogen storage tank, this paper established the multi-time scale scheduling model of the port logistics-energy integrated system. The excessive electrical energy is stored using electrolytic water hydrogen production technology. On this basis, the electricity and hydrogen load demands are coordinated. Then, a piecewise-linearization method is proposed to efficiently solve the high-order nonlinearity temperature-pressure equation. Finally, the feasibility and accuracy of the proposed method is verified by testing on a standard port integrated energy system.