A power flow control strategy for high energy efficient smart LED lighting system powered by PV and MPPT controlled DC grid

In office buildings, the use of LED lighting system to replace the inefficiency of the common lightings like incandescent, fluorescent and halogen lamps presents a wide opportunity to get high efficiency, long life-time, significant cost reduction, and low maintenance. In this paper, a power flow control strategy for high energy efficient smart LED lighting system powered by Maximum Power Point Tracking (MPPT) controlled DC grid in office buildings is proposed. The proposed system architecture is studied in three main aspects, which are the choice and the design of the topology of the whole system, the smart LED lighting driving and dimming, and the control strategy combining the MPPT with the energy management. In addition to that, two targets are taking into account: The CO2 emissions reduction and the power flow reduction from the grid when the PV generation and energy storage capacity are less than the local demand. Several modes of operation are used to achieve these goals, and their strengths and weaknesses are evaluated. In order to verify the effectiveness of the proposed system, a computer simulation is achieved, using DIALUX simulator for lighting system design, MATLAB/SIMULINK simulation package for energy management, and some experiments are carried out on a test room equipped with the smart LED lighting system.