Economic characteristics of highway self-consistent energy system planning

To promote the integrated development of transportation and energy, an architecture of highway self-consistent energy system was constructed, with wind-photovoltaic-storage as the power supply side and highway electricity equipment as the demand side. The architecture was equipped with reasonable operation rules. Besides, a planning model for the self-consistent energy system was built with the number of wind-photovoltaic-storage equipment as the planning variable, the equivalent annual cost of system as the optimization objective, the probability of power shortage and the amount of curtailed wind and photovoltaic power as the constraints. Simulations were performed with wind and solar historical data and load demand data in a certain western region as inputs after the operation rules being transformed into specific strategies. Research results indicate that the upper limit increase in microgrid interconnection power can significantly reduce the cost of the self-consistent energy system. When the upper limit of microgrid interconnection power increases from 0 to 1 000 kW, the equivalent annual cost of the system decreases by 8. 53%. A new energy accommodation rate increase will lead to rising cost. Too high pursuit of new energy accommodation rates can even result in a sharp cost rise. The strengthening of constraints on curtailed wind and photovoltaic power leads to a 9. 05% increase in new energy accommodation rate, while the equivalent annual cost increases by 73. 86%. The application of hierarchical load management can significantly reduce the economic cost of the system. When the upper limit of the loss of load probability for primary load remains unchanged, and tertiary loads change respectively from 0 to 0. 05 and 0. 20, the equivalent annual cost of self-consistent energy system even reduces by 90. 97%. Based on these findings, it can be concluded that the application of microgrid interconnection and hierarchical load management, and the appropriate new energy accommodation rate requirements can make the cost of highway self-consistent energy system planning more reasonable. 10 tabs, 11 figs, 46 refs. © 2024 Chang'an University. All rights reserved.