DC Nano grid Control in the Residential Energy Router with the Presence of Constant Power Loads

Abstract

Increasing penetration of DC-based electronics loads has highlighted the idea of DC -grid which is more efficient. Furthermore, DC -grid provides the distributed generators utilization that mostly is DC -based. As a result, in this study, we propose the combination of DC nano grid to the traditional AC-nano grid to the distribution system of a house using a power-electronics-interface called an energy router. However, interactions of multiple DC - DC and AC - DC converters in the nano grid make challenges in the stability of the system and control of it. Constant power loads are one of the main challenges since they are highly nonlinear and they behave as negative resistor from the feeder-side point of view. Consequently, we propose a nonlinear control technique to control the DC nano grid with the presence of constant power load in a residential application.