On Optimal Cost Planning of Low Voltage Direct Current Power Distribution Networks

In this article, optimal planning problem of large-scale urban power distribution network, in the presence of low-voltage direct current (LVDC) distribution technology, is formulated. The problem is modeled as a minimization of cost function comprising construction and loss costs. Simulations are performed on an urban test-case; spatial load forecasting is adopted and imperialist competitive algorithm (ICA) is utilized to find the optimal solution. Results show that the smaller sizes (large numbers) of MV substation (distribution transformer and rectifier) give the optimal solution. MV substations have standard sizes up to 2500 kVA; the proposed planning approach opted substations of size up to 315 kVAfor a total cost function comprising costs of LV feeders and MV substations.