Power consumption analysis on an IoT network based on wemos: a case study

On Internet of Things network (IoT), connections established among every device that connected to the Internet. An IoT uses different communication method instead to that, the Internet uses. Internet of Things (IoT) applications, use a light weight protocol Message Queue Telemetry Transport (MQTT). In this article an Internet of Things (IoT) system is presented, an advanced solution of monitoring the temperature and luminosity at different locations in a data centre of MQTT Server, measuring power consumption in 2 types of time of capturing data (every 0,5 min and every 1 min) making temperature and luminosity data visible over internet through cloud based dashboard. The quality of service (QoS) in some application is very crucial because the data collection is essential. This research focus on QoS in terms of power consumption as well as the battery life of the system. The results show that the battery life span is proportional to the QoS and the longevity of the battery and respectively the IoT network life depends on it

Optimal Excitation Controller Design for Wind Turbine Generator

An optimal excitation controller design based on multirate-output controllers (MROCs) having a multirate sampling mechanismwith different sampling period in each measured output of the system is presented. The proposed H∞ -control techniqueis applied to the discrete linear open-loop system model which represents a wind turbine generator supplying an infinite busthrough a transmission line

Non destructive testing of medium and high voltage cables with a transportable radiography system

A power cable is the most important part in a power transmission system. The cables must be total quality dedicated andcertified for development, manufacturing and installation, however are exposed to a corrosive environment. The purpose ofthis paper is to show that the fast neutron radiography with a transportable system is a solution to find defects in the cablesand reduce the cost of inspection. The design, regarding the materials considered, was compatible with the European UnionDirective on “Restriction of Hazardous Substances” (RoHS) 2002/95/EC, hence excluding the use of cadmium and lead.Wide width values for the collimator ratio were calculated. With suitable collimator design it was possibly to optimize theneutron radiography parameters. Finally the shielding design was examined closely. The proposed system has been simulatedusing the MCNPX code

Study of a Wind/PV/Battery hybrid system – Case study at Plaka in Greece

The primary objective of this study is to determine the optimum hybrid system able to supply the necessary electrical load of a typical community in a remote location in Greece. The renewable energy systems were comprised of different combinations of PV modules and wind turbines supplemented with battery storage. A software tool, HOMER is used for the analysis. The hybrid system analysis has showed that the minimum cost of energy is 0.268 $/kWh with 10% annual capacity of shortage. The optimum hybrid system is comprised of 1.5 kW PV array, 1 wind generator, 3 kW power converter and 14 storage batteries

Wind Turbine Blade Nondestructive Testing with a Transportable Radiography System

Wind turbines are becoming widely used as they are an environmentally friendly way for energy production without emissions; however, they are exposed to a corrosive environment. In addition, as wind turbines typically are the tallest structures in the surrounding area of a wind farm, it is expected that they will attract direct lightning strikes several times during their operating life. The purpose of this paper is to show that the radiography with a transportable unit is a solution to find defects in the wind turbine blade and reduce the cost of inspection. A transportable neutron radiography system, incorporating an Sb–Be source, has been simulated using the MCNPX code. The simulated system has a wide range of radiography parameters

AN EVALUATION OF THE FACTORS INFLUENCE THE ELECTRIC POWER PRODUCTION FROM BIOMASS IN THE CERTAIN AREA OF KAVALA-GREECE

ABSTRACT This paper deals with the issue of whether then are benefits in establishing an electric power production plant (EPPP) using biomass as fuel in a certain geographical area (prefecture of Kavala/ Greece) taking into account nine certain factors that strongly influence and determine the final decision about the capacity/size and viability/feasibility of the EPPP unit proposed. Using the M. Falia Model we concluded that a certain capacity's EPPP can be established in prefecture of Kavala being viable and profitable. The nine factors used in the model are: 1. The extent of area capable to produce the biomass required for the EPPP operation; 2. The quantity of biomass required; 3. The plant mix of biomass; 4. The quality of biomass defined international standards; 5. The net thermal value 6. The ex-factory total unit cost of biomass used as «fuel»; 7. The environmental benefits quantified by us; 8. The total investment cost for the EPPP; 9. The real discount rate or International Rate of Return (IRR). The model uses the EPPP capacity as dependent variable and the nine factors as independent ones, resulted in an optimal solution about the feasibility of establishing an EPPP unit in the certain area of Kavala prefecture