Aiming at problem of limited energy of nodes in wireless sensor networks（ WSNs） applied in smart grid

in order to increase sustainability of WSNs

focused on analysis of sustainable wireless rechargeable sensor networks（ SWRSNs） based on the RF wireless charging technology and put forward differentiated RF rechargeable sensor networks（ DRRSNs） which increase the node priority setting

an integer linear programming model is built to determine the location of landmarks. The solved data of integer linear programming model through CPLEX show that obtained energy of node of DRRSNs can be improved by an average of 105 % and the high priority sensor node could receive average 43 % more energy than low priority sensor node. So DRRSNs can effectively improve the lifetime of the nodes and ensure the reliability of WSNs

but the path traversal efficiency is reduced by an average of 14 %.