Danijel Topić

Exploitation of public lighting infrastructural possibilities

Paper deals with the possibility for exploitation of public lighting infrastructure for multiple purposes. Public lighting infrastructure is not fully utilized. Therefore there is a great potential to reduce electricity and operational costs by establishing smart public lighting. The first step in that intention is to replace existing lamps with LED-based technology that will result with reduction of energy and operational costs. By connecting those LED lamps municipalities can additionally cut energy costs which is result of real time intelligent management and faster response. Smart public lighting includes many functional units such as remote management system, sensors for traffic monitoring, traffic counter, digital traffic signs, integrated electric vehicle charging stations and much more. The combination of all these features makes public lighting system smarter and more exploited. At the same time this is a good way to establish the smart lighting system and an intelligent traffic system. The paper presents public lighting operational profiles with analysis of dimming possibilities of LED lighting lamps.

Influence of distributed generation from renewable energy sources on distribution network hosting capacity

The influence of distributed generation (DG) from renewable energy sources on the distribution network (DN) hosting capacity was analyzed in this paper. The analysis was conducted on the simulation model which represents a real DN with the DG consisting of medium size biogas combined heat & power (CHP) and small size household photovoltaic (PV) systems. Main goal of this paper was to analyze how the different voltage regulation methods and network topology manipulations like the integration of a new substation near the DG and adding new power lines affects the DN hosting capacity for the DG. Power flow simulations of different cases in this paper were analyzed by monitoring the voltage or current limitation levels of the elements into the network. Effect of the amount of power injected by the DG into the network on power losses was also studied.

Comparison of the Shading Influence on PV Modules of Different Technologies

The characteristics of different PV modules are provided in this paper. The influence of shading on PV module characteristics of different technologies (different crystalline silicon and thin film technologies) is investigated. The study also took into account the orientation of PV modules (portrait or landscape), a by-pass diode number and a type of connections. An inter-row shading factor for different PV modules has also been determined. A comparison of shading influence on PV module characteristics of different technologies has been drawn. A shading factor comparison of different technology PV modules has also been made. The influence of shading on PV system electricity production has been modelled based on a study which examined the influence of shading on characteristics of different technology PV modules.