Transactions on Energy Systems and Engineering Applications

End-use energy indicator approach to improve energy performance at the National University of Colombia Bogotá, under the parameters of the ISO 50001 standard

2022-10-29T13:58:18+00:00

The university belongs to the services sector, which is why it cannot implement traditional industry indicators such as energy consumption per unit produced. For this reason, we propose indicators for the final use of energy. The indicators were developed through an energy review process of the information in the database of advanced energy meters with the support of the Specialist in Geographic Information Systems of the Environmental Management Office (EMO). Additionally, we considered several existing reports that characterized the final use of energy for some buildings and essential data for defining the percentages each final use will have within the conglomerate of loads registered. Continuity was also given to this process by collecting face-to-face information with the support of each building’s environmental manager. This article shows the behavior of two buildings of the National University Bogotá, the Uriel Gutiérrez building and the Roberto Franco Station, to propose an indicator of final energy use. This approach enabled determining in which end-use the load has the highest consumption, taking into account that this may contribute to the management system energy of the university. This article uses the guidelines implemented in the ISO 50001 standard.

Methodology for characterization and planning of electricity demand in an isolated zone: Mitú Approach

2022-09-05T14:43:44+00:00

This paper aims a model for the characterization and planning of electricity demand in isolated networks when there is no information from the measurement system, a typical scenario in the Colombian Non-Interconnected Zone. This research is based on Arvidson method of the publication entitled: "Diversified demand method of estimating residential distribution transformer loads". This study proposes consumption indices for typical household appliances based on a statistical analysis of load censuses. Then, a timely contrast is made between the curves of the Arvidson study and the generation curves of the isolated network because there is no direct measurement in the end-users and by macrometers associated with the transformers. With this information, we proceed to complement the validated Arvidson curve with its own index; this index allows the proposed curve to be readjusted to a similar curve, per unit, with the generation profile. The main contribution is to propose a new factor, in order to, contextualizes and diversifies the Arvidson method to specific case studies to building daily electricity demand and diversified demand curves as tools for planning the electrical system and managing the electrical infrastructure.

Union by Co-Lamination of Aluminum and Magnetic alloy obtained by Rapid Solidification

2022-11-30T02:27:33+00:00

The aim of this work is to analyze the possibility of producing a joint by lamination of an Al-1050 plate and Fe₇₈Si₉B₁₃(%at.) soft magnetic ribbons material obtained by a rapid solidification process by using the Melt Spinning (MS) technique. The lamination conditions are studied on the characteristics of the joint, the microstructure, and the magnetic properties. Mainly the surface preparation, temperature, and reduction of thickness. The material is characterized by X-Ray Diffraction, Optical, and Scanning Electron Microscopy, showing a completely amorphous structure before and after the collamination, the typical defects caused by this rapid solidification technique in ribbons (bubbles, dust particles, roughness imperfections and oxides) and the joint between materials. The microhardness Vickers has been determined in both, the ribbons as quenched and collaminated samples, to observe quantitatively the hardening suffered during colamination and find a possible cause. The Differential Scanning Calorimetry and Compositional Analysis by EDS techniques were also used to determine the crystallization temperatures and chemical exact chemical composition of the ribbons as received. The magnetic hysteresis curve of the amorphous ribbons showed a Hc and Ms around 3.8 A/m and 1.44 T correspondingly.

High-speed 3D optical sensing for manufacturing research and industrial sensing applications

2022-12-05T03:14:37+00:00

This paper presents examples of high-speed 3D optical sensing for research and applications in the manufacturing community. Specifically, this paper will focus on the fringe projection technique as a special technology that can be extremely beneficial to manufacturing applications, given its merits of simultaneous high-speed and high-accuracy 3D surface measurements. This paper will introduce the basic principles of 3D optical sensing based on the fringe projection technique as well as the enabled manufacturing research applications, including both in-situ/in-process monitoring and post-process quality assurance.

Visualization Proposal for Power System Control Rooms Based on Situational Awareness

2022-08-18T02:56:24+00:00

Due to the increasing size of electric power systems and its monitoring and operation needs, people at control rooms face complex situations, analyzing great amounts of information, protocols, operation states, alarms, and control parameters. Additionally, new renewable energy sources data is taking its place nowadays, hindering the process of quickly reading and interpreting information. This is known as the loss of Situational Awareness, SA, of system operators. This work presents proposals for displaying useful information in control rooms and visualization techniques to support accurate SA. Grid data displays, maps, trending graphics, lists, bars graphics, table plots, hierarchical levels, proximity regions, and connections are also proposed and analyzed, presenting an application case in a microgrid control room.

Applications of Digital Twins in Power Systems: A Perspective

2022-11-04T00:58:51+00:00

Data science-based digital twin models of renewable energy system technologies developed in a real-time data-rich environment help develop better decisions and predictions than those in the present environment. Based on this real-time analysis of countrywide data, digital twin contributes to effective and reduced cost-based power system control at the localised level. Developing digital twin models from the collection of relevant data is an innovative technology. The challenge is how to leverage all the operational data and analyse the use of data from across transmission and distribution networks to help achieve the objectives. This paper presents an overview of the existing applications of digital twins in power systems.

Recent Developments

2023-01-12T20:39:26+00:00

Editor-in-Chief Andres Marrugo discusses the latest developments in the journal.