Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4060
Author(s):  
Artur Kozłowski ◽  
Łukasz Bołoz

This article discusses the work that resulted in the development of two battery-powered self-propelled electric mining machines intended for operation in the conditions of a Polish copper ore mine. Currently, the global mining industry is seeing a growing interest in battery-powered electric machines, which are replacing solutions powered by internal combustion engines. The cooperation of Mine Master, Łukasiewicz Research Network—Institute of Innovative Technologies EMAG and AGH University of Science and Technology allowed carrying out a number of works that resulted in the production of two completely new machines. In order to develop the requirements and assumptions for the designed battery-powered propulsion systems, underground tests of the existing combustion machines were carried out. Based on the results of these tests, power supply systems and control algorithms were developed and verified in a virtual environment. Next, a laboratory test stand for validating power supply systems and control algorithms was developed and constructed. The tests were aimed at checking all possible situations in which the battery gets discharged as a result of the machine’s ride or operation and when it is charged from the mine’s mains or with energy recovered during braking. Simulations of undesirable situations, such as fluctuations in the supply voltage or charging power limitation, were also carried out at the test stand. Positive test results were obtained. Finally, the power supply systems along with control algorithms were implemented and tested in the produced battery-powered machines during operational trials. The power systems and control algorithms are universal enough to be implemented in two different types of machines. Both machines were specially designed to substitute diesel machines in the conditions of a Polish ore mine. They are the lowest underground battery-powered drilling and bolting rigs with onboard chargers. The machines can also be charged by external fast battery chargers.


2009 ◽  
Vol 42 (11) ◽  
pp. 393-398
Author(s):  
S. Bittanti ◽  
L. Calloni ◽  
S. Canevese ◽  
A. De Marco ◽  
V. Prandoni

2010 ◽  
Vol 47 (4) ◽  
pp. 430-447 ◽  
Author(s):  
D. U. Campos-Delgado ◽  
Diego R. Espinoza-Trejo

In this paper, the design of a d.c. switched power supply is proposed as a hands-on educational tool in power electronics and classical control theory. The project's importance rests primarily in its position as part of the curricula of a Bachelors programme in electronics engineering. The core of the d.c. power supply is a d.c./d.c. switched converter, where a feedforward-feedback control loop is in charge of adjusting the switching pattern to compensate disturbances and voltage drops in the circuit. The project is structured in four major steps: d.c./d.c. converter analysis, controller design, d.c./d.c. converter construction and closed-loop implementation. All these steps are detailed in the paper, and the mathematical derivations needed by the students are clearly explained. In addition, the paper includes a full description of the electronics circuits employed in the project, with synthesis expressions that help the students to select the implementation elements.


2018 ◽  
Vol 44 ◽  
pp. 00180
Author(s):  
Grzegorz Trzmiel ◽  
Maciej Łopatka ◽  
Dariusz Kurz

The paper touches upon the current issues related to the use of visualisation, control and archiving systems (SCADA) in hybrid power supply systems, based on the example of an installation that uses the energy of the sun and wind. The article contains an exemplary design of an autonomous hybrid power supply system and the SCADA system implemented in the Vijeo Citect environment. The major focus is on the presentation of the essential and the most frequently used SCADA system functionalities in terms of the monitoring and control of this type of power supply systems.


Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2871
Author(s):  
Maarten Wolsink

The transformation of a power supply, a social-technical system suffering from a heavy lock-ins, requires structural adaptations which are extremely complex. All actors in social acceptance processes have either strong vested interests in the current system or are challenging these. In strategies developed by those actors, so-called ‘frames’ play a key role. These are biased problem definitions and mental shortcuts, tools to affect the course of decision-making processes. Examples are “clean coal”, “smart grid”, “base-load”, or “decentralized”. Framing is fundamental to political processes, including those of decision making on renewables. This review presents a glossary of significant frames used in social acceptance processes of renewables’ innovation in power supply systems. The identified frames are classified and presented with, in each entry, one significant frame discussed and analyzed in relation to its most associated frames. Overall, the contrast comes to the fore between the paradigm of the current heavy centralized and hierarchically managed power supply system, on the one hand, and the newly emerging concepts around distributed generation on the other hand. Within these two clusters and in between, certain frames are focused on issues of ownership and control of infrastructures, while others concern allocation of space for establishing infrastructure.


2021 ◽  
Vol 31 (31) ◽  
pp. 57-84
Author(s):  
Željko Despotović

Power electronics devices and modules that are most often used in power supply systems when compared to the passive components usually exhibit a very poor ability to withstand surge voltages. These surge voltages can be of different origins, and in most cases are transient surges. The recorded surge voltages even at low levels can lead to a damage of the mentioned power electronics devices or power converter components. Consequently, it is very important to implement a number of measures to increase the insulation level of the entire system. In this paper the two representative examples of insulation coordination are elaborated: i) an industrial AC drive and ii) photovoltaic inverter used in solar grid-connected power systems.


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