ABSTRACT
With the promising development of Direct Current (DC) distribution networks, load control problems in DC networks need great attention. In this paper, we focus on the optimisation of energy use in DC networks. We first model the Power Electronic Load (PEL) units as the controllable impedance, and establish the voltage model of the distribution network. By applying this model, we formulate the underlying load control problem as an optimisation problem that coordinates the bus voltage by minimising the system costs, consisting of the line losses costs and the deviation costs of PELs. Compared with the traditional optimal power flow problems, our model involves one control variable only, i.e. voltage, which makes it easier to solve. Nevertheless, as the resulting optimisation problem is non-convex, we use a Particle Swarm Optimisation (PSO) algorithm to solve it, and the developed results are demonstrated via a numerical example.
