Research and development of smart LED lighting system: Summary of the doctoral thesis

LED luminaries currently are the key solution aimed at increasing the efficiency of street lighting systems, and with implementation of movement sensors and efficient light regulating algorithms, the smart street lighting systems have high future potential, creating new functions and opportunities for smart cities that would consequently create significant economic benefits. Hypotheses: 1. It is possible to save up to 50 % on electricity with smart street lighting systems equipped with LED luminaires. 2. It is possible to save additional 10 % on electricity with smart street lighting systems equipped with LED luminaires and motion sensors. 3. Smart lighting control system with dynamic control algorithm can improve lighting quality and traffic safety on streets. Aims: 1. Perform analysis of lighting systems and develop their architecture comparison. 2. Develop a new smart LED lighting system. 3. Experimentally prove advantages of smart LED lighting systems. 4. Optimise new smart LED lighting system control methods. MatLab and MS-Excel computer programs were used to simplify the theoretical calculations and graphically represent the obtained results. In addition to modelling and development of electrical circuits, OrCAD and LTspice software were used. The verification of the obtained theoretical results in laboratory conditions was performed with the help of experiments in a laboratory specially adapted for this purpose and in a specially built laboratory stand. Measurements were performed using Hagner digital lux meter EC1, LMK MobileAir lighting photo camera able to take luminance photography, and Avantes VIS-NIR spectrometer. An adjustable DC power supply or autotransformer, function generator (for control signals), power analyser, oscilloscopes, thermal imager Fluke Ti10 and laser temperature meter were used to test the electrical parameters both indoors and outdoors. In the course of the work, in-depth knowledge of intelligent street lighting systems with LED luminaires was acquired, which allowed to provide expertise services to several Latvian municipalities and institutions of Ministry of Environmental Protection and Regional Development of the Republic of Latvia. New product has been developed – dimmable LED luminary with power of 56 W. A novel adaptive control algorithm for maximum energy efficiency increase has been developed which has the necessary lighting quality and traffic safety in terms of lighting parameters. In the course of the work, experimental tests of LED lighting systems were carried out in several Pilot Sites, which allowed to evaluate the reduction of power consumption of large number of lighting luminary in real lighting systems and compliance of lighting quality parameters to regulatory norms and initial results of Dialux modelling programs and overall efficiency of the control system.