In order to meet the requirements of flexible multi-state switch access strategy planning in multi-terminal interconnected power distribution systems

a reliability evaluation method for multi-terminal flexible interconnected power distribution systems with flexible multi-state switches is proposed in this paper. Firstly

based on the physical structure of the flexible multi-state switch and its control operation strategy

the reliability evaluation model of the flexible multi-state switch is established. Secondly

based on the system operation mode and network structure change brought by the flexible multi-state switch access system

the load recovery strategy for disconnected side is designed and the factors affecting the system reliability are refined. Finally

a reliability evaluation method based on sequential sampling and fault analysis decoupling is proposed

and the influence of different access strategies of flexible multi-state switches on system reliability is quantitatively analyzed. The simulation results show that after the flexible multi-state switch is connected

the SAIFI is increased by about 38.2%

the SAIDI is increased by about 49.6%

the ASAI is increased by about 1.1%

and the reliability of the distribution network system is improved significantly. The research results can provide theoretical supports for the research of flexible multi-state switch access strategy

and provide references for the planning and design of flexible interconnected power distribution network in the future.