In recent years

the increasing occurrence of extreme events has posed a serious threat to the safe and stable operation of distribution networks (DNs)

an urgent need to take effective measures to improve the resilience is on the way. Meanwhile

the wide access of electric vehicles (EVs) and energy storage devices has provided new ideas for enhancing the emergency support and safeguard capability of DNs. For this reason

the maturity and superiority of EV battery swapping technology are analyzed firstly in this paper

and a post-disaster power supply scheme using EV replaceable batteries as emergency sources is proposed. Secondly

a two-layer optimal configuration model of DN multi-type emergency resources considering line reinforcement

mobile energy storage systems and EV replaceable batteries is developed

in which the upper-layer model decides the number and capacity of the three emergency resources targeting at minimizing overall investment during the programming period

and the lower-layer model determines the scheduling plan of the above-mentioned emergency resources

as well as the gas turbines

distributed generators

and stationary energy storage systems that are already available in the DN

with the goal of minimizing the operation costs of the system under disaster scenarios. Finally

a case study based on the improved IEEE 33-node system is carried out. The results show that the proposed strategy can fully utilize the complementary advantages of multi-type resources

and truly improve the DN resilience while minimizing the financial investment.