This paper proposes a new dynamic strategy for selecting the optimal cluster head in Stable Election Protocol (SEP). The proposed strategy selects a node as cluster head if it has the maximum energy among all the available nodes in that particular cluster. The maximum energy is that which is calculated at running time of the WSN. The proposed strategy considers heterogeneous nodes and divides nodes among normal, intermediate and advance nodes. To handle the heterogeneity of the nodes, different optimized probability density functions are selected. First node dead time define the network stability period and last node dead define the overall network lifetime. The main emphases is to increase the time when first node dies and also when last node dies. The proposed strategy is designed and implemented in the MATLAB tool using mathematics toolbox. The proposed algorithm is also compared with the some well known protocols like LEACH, E-LEACH, SEP and Extended SEP.
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