Background: The energy router based on power electronic technology is the core equipment
of energy internet. Energy router can control the voltage of the port and regulate the power injected
into the network flexibly. It is of great significance to study how the capability of the energy
router can be used to improve characteristics of the power system.
Methods: Based on the analysis of energy router, we construct a unified AC-DC power flow model
for energy router considering its different control modes. Then, we establish an optimal power flow
formulation for the energy router incorporated AC-DC network and propose the multi-objective
function to optimize the comprehensive performance of the network. Several cases are observed and
analyzed on a modified IEEE-57 system.
Results: The result verifies that the optimal power flow formulation can optimize the control values
of ports of the energy router and improve the operating state of the power system. The optimal target
presented in this paper can improve the characteristics of the grid better than a single optimal target.
Conclusion: Energy router will play a vital role in the energy internet based on the power system.
The characters of the power system can be improved and the operating costs can be reduced by utilizing
the functionality of energy router in regulating power flow.