The access of distributed generation

energy storage devices and electric vehicle charging piles inevitably aggravate flexible interconnected distribution network and involve the operation optimization control of the distribution network

the introduction of SNOP（soft normally open point

SNOP）effectively improves the ability to dissipate distributed generation and fluctuating loads. Therefore

the study and analysis of flexible interconnected distribution networks with SNOP is also particular of importance. Firstly

the topology offlexible inter connected distribution network system of SNOP at different cases under the condition of detailed introduction of principle and function of SNOP. After that

the constraints and optimization models of multi-terminal SNOP under the consideration and neglect of loss are established

and the key technologies of reactive power optimization of flexible interconnected distribution network with SNOP are analyzed and compared.Finally

both the problem and study direction in reactive power optimization of flexible inter connected distribution networks with SNOP are proposed.