“…Energies 2018, 11, 3296 6 of 22 set, N, composed with an arc set, A ⊂ (m, j), joining the trading node m and j as presented in [25]. Two different nodes in L, namely N a : = {1, 2, …, Na} and N r : = {1, 2, …, Nr}, corresponding for the DR aggregator and DR purchaser (as see Figure 2).…”