Modelling and control of a photovoltaic energy system with battery storage

"This work presents a simulated study of the energy management of an energy system connected to the grid with photovoltaic generation and battery storage. The work proposes a energy management system based on fuzzy logic. It is intended to be used in the hotel industry. The objective of the proposed controller is to maximise the renewable power source but including also economic criteria in the management. The proposal was implemented in simulation considering a 5,1kW peak photovoltaic installation and a set of batteries with a capacity of 384Ah. First results obtained show that the system achieves the specifications proposed. Thus, the study evidences the potential of the proposed control algorithm and demonstrate the suitability of the use of intelligent techniques for the energy management in hotels."

"Hyperspectral data processing and adaptive modelling for the Natural Objects properties detection"

"The article proposes a method for assessing the state of natural objects that is based on the complex use of heterogeneous models and hyperspectral Earth remote sensing data used to estimate the parameters of these models. The base model is an artificial neural network, for the training of which multiparametric models of radiation transfer, gradient search algorithms, as well as regression empirical models supplementing them, can be used and adaptively adjusted. The advantage of the method is the ability to determine the state of water bodies and vegetation under conditions of uncertainty with the possibility of making more precise estimates for the limited volume of ground measurements at reference points. Examples of approbation of the method in determining the state of coastal waters of the Black Sea with the use of hyperspectral imaging materials from “Resurs-P” satellite, as well as in assessing the state of vineyards, are shown."

Corporate sustainability assessment through fuzzy TOPSIS

"The aim of this paper is to propose a decisionmaking methodology that enables the analysis and evaluation of sustainability at the corporate level. The proposed methodology grounds on two tools, namely the technique for order preference by similarity to ideal solution (TOPSIS) approach and fuzzy logic. The integration of these tools offers an effective way to deal with two typical issues of sustainability assessment, i.e.: 1) the fact that the company’s performance should be frequently evaluated against qualitative key performance indicators; and 2) the fact that to be meaningful, the company’s sustainability performance needs to be compared to a reference value, e.g. a threshold or benchmark, to evaluating how the company is distant from a target. The proposed approach has been applied to a real firm, operating in the food machinery industry, for testing purpose. The main pros and cons of the approach are described."

"Simulation of an Isolated Wind Power System with Battery Energy Storage and Dump Load"

"This study presents the modelling and dynamic simulation of an Isolated Wind Power System (IWPS) consisting of a Wind Turbine Generator (WTG), a synchronous machine (SM), consumer load, dump load (DL) and a Battery Energy Storage System (BESS). First the IWPS architecture and the dynamic models of the IWPS components are described. Second, the control requirements for frequency regulation of the IWPS are studied and a PID regulator to govern the active power stored+dumped by the BESS+DL combination or supplied by the BESS along with a power sharing algorithm between the BESS and DL is presented. Finally the IWPS is simulated facing to variations to load and WTG power. The simulation results are given showing graphs of the main electrical variables in the IWPS: system frequency and voltage and active power in each component. The results show how the BESS or BESS+DL combination regulates correctly the isolated system frequency. The results also show that the BESS improves the IWPS reliability when compared with the frequency control obtained using only the DL."

"Investigation of pressure loss coefficient of hot duct break scenario in ALLEGRO reactor using the CATHARE thermohydraulic code"

"Preliminary thermohydraulical calculations carried out for the ALLEGRO 75 MW CEA 2009 design (Mayer and Bentivoglio 2014) pointed out that the peak cladding temperature exceeded the required temperature limit in case of hot duct break scenario, when the aggravation event of the stop of the second blower was taken into account. The value of the pressure loss coefficient used in the hot duct break modeling plays pivotal role in the corresponding peak cladding temperature (PCT). In this study we investigate how this pressure loss value influences the peak cladding temperature in ALLEGRO reactor. We selected the French CATHARE thermohydraulical code as a simulation tool to describe the hot duct break transient and to determine the PCT values. We carried out several transient calculations by varying the pressure loss coefficient and the results confirmed its importance. It was found that if the pressure loss value is less than 1.4 the PCT limit exceeds the criterion of 850 oC."

"Infrastructure linking for E-Mobility – approach to integrative traffic and energy network planning"

"This paper gives an introduction to the strategic research field of the cross-infrastructural planning process and the system operation for charging stations from the traffic and energy network view. In the course of the energy turnaround in Germany (grid and plant expansion, liberalization) as well as changes in the transport sector (increasing traffic volume vs. increasing loss of transport infrastructure [Radke 2017; Daehre 2012]) complex cross-infrastructure solutions and tools (simulation systems) will be needed in order to ensure the technical reliability as well as the economic and ecological orientation of these systems. Based on the current stock of charging points and the forecasted total demand, there is a need for the comprehensive construction of charging infrastructure for electric vehicles. This creates user acceptance and lowers the barriers to electric vehicles in the private and commercial sectors."

"Design methodology considering environmental impact and critical raw materials, application on induction hobs"

"The target of this paper is to show a methodology developed to establish the influence of material composition on the environmental impact, considering the presence of critical and strategic raw materials. A Life Cycle Assessment (LCA) has been performed to calculate the environmental impact, analyzing all the life cycle stages of the product. In order to achieve a more precise environmental impact analysis, EcoInvent database has been updated with primary data from product supplier’s data. Also, a new software tool, “Sustainable Electronics” was developed and used to calculate the environmental impact and raw material consumption. This methodology has been implemented on an induction hob, as it is a multipart product made of several components from electronics boards to metallic and plastic parts. The application of this methodology shows the huge influence of material composition on the environmental impact of the product, helping engineers to design more sustainable products."

"Modeling and simulation of blood flow and vessel stress in human brain during strenuous exercise"

"In order to study the effect of strenuous exercise to human blood flow and vessels stress, the paper takes the central artery in human brain for an example, and carries out a two-way fluid-solid coupling finite element analysis on it. The three-dimensional model is reconstructed, and the calculation was made with Computational Fluid Dynamics software. The simulation results show that, a low velocity vortex region is formed in the sinus of the artery, and the vortex phenomenon is getting weaker with the increase of the acceleration value. The structure shape of blood vessel is the main factor affecting the wall shear stress and Mises stress. With the increase of the exercise acceleration, the maximum of wall shear stress and Mises stress of the vessel wall shows an approximate linear growth."

Modelling of a solar air conditioning pilot plant

"The present work repots the modelling of a solar air conditioning pilot plant to be installed in the Centro de Tecnología Avanzada (CIATEQ) in the city of Queretaro, México. The modelling was carried out by using the software Transient System Simulation Tool-16 (TRNSYS- 16). The pilot plant mainly consists of an absorption cooling system, a solar collector’s field, a hot water storage tank, a cooling tower and an air handler. The office of the CIATEQ were first modelling without an air conditioning unit and then with the proposed solar air conditioning pilot plant. The results showed that without air conditioning, temperatures higher than 28 ºC can be reached between the 12:00 and the 19:00 hours during spring and summer, while with the proposed pilot plant temperatures not higher than 25 ºC can be obtained during the whole year during the working hours."