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In this paper, the new method for computation of a minimal realisation of a given proper transfer function of all-pole and all-zero continuous-time fractional linear systems using one-dimensional digraphs theory D(1) has been presented. For the proposed method, an algorithm was constructed. The proposed solution allows minimal digraphs construction for any one-dimensional fractional system. The proposed...
This paper sets forth the design of a soft-switched bi-directional DC-DC converter for charge balancing control of Electric Vehicle (EV) application-specific Li-ion battery strings. A high efficiency phase shifted full bridge converter steps down the pack voltage in order to charge one cell at a time, while a push-pull converter boosts the voltage of one individual cell to meet the charging voltage...
This paper presents energy management improvement for a Hybrid Electric Boat (HEB) applications using frequency approach. A variable speed Diesel-Permanent Magnet Generator (Diesel-PMG) is assisted by the lithium-battery to satisfy energetic demand of HEB. The lithium-battery module is connected to DC-bus through a buck-boost converter, and that of the variable speed Diesel Generator, it is connected...
Worldwide nowadays there is a serious tendency of passing from internal combustion engines to electrical or hybrid propulsion systems. On this trend, the paper details the itinerary from concept to numerical validation of an electrical propulsion unit, dedicated for a light electric vehicle which is equipped with a switched reluctance machine (SRM). Starting from the design concept, analysis via complex...
The paper is focused on a detailed dynamic study for an axis belonging to a serial robot structure. It contains an analytical study for the driving moments for a translational robot axis based on ball screw transmission. The study of transmission gearing, and implicit a rigorous determination of the driving moments, along the cinematic chain of the mechanical robotic system is a fundamental aspect,...
The energy consumed by buildings is the most important component of the total energy consumption in the developed countries, but also worldwide. There are several important international programs which aim at developing innovative ways for reducing the consumption of energy related with buildings. Producing and consuming locally the energy is the most effective way of harnessing the maximum benefit...
A modulation technique based on mathematical chaos is introduced and investigated with respect to suppress electromagnetic inference (EMI) in power electronics converters with replacing or complementing traditional filtering and schielding technologies in mind. The technique allows for parameter modulation and for chaos-based pulse width modulation (PWM). The latter can be implemented both in analogue...
The paper describes the dynamic behavior of STATCOM device and a SVC device connected in the National Grid and shows simulation results. The operation principle of the two devices will be presented. The simulations were made using specialized software Eurostag. Various operation scenarios were simulated in order to show the impact on the transmission power grid.
A new method of high-level test generation for control faults in digital systems is proposed. High-level faults of any multiplicity are assumed to be present, however, there is no need to enumerate them. A novel concept of test groups which has the goal to prove the correctness of a part of the system's functionality instead of keeping track of fault coverage during test generation as in the traditional...
A hierarchical model predictive control for the biological treatment process of an activated sludge wastewater treatment plant is presented. On the basis of a previously developed PI control for the dissolved oxygen concentration and air pressure in the aeration system, an improved optimization strategy based on Model Predictive Control (MPC) is added. The MPC based control loop keeps the output substrate...
Accurate prediction of flood extents in river catchments happen to be a challenging issue. Paper exposes numerical simulation techniques of flooding circumstances, induced by flash floods, dams/ dykes breaking. The results reveal that the Computational Fluid Dynamics approach for floods modeling is skillful to adequately replicate the foremost aspects of the floods routing. Supplying warnings with...
Present paper presents an approach related to the question of structuring a federation of SCADA systems, associated with the integrated water resource exploitation, from a certain catchment area. Utilized instruments for federation development there are: (i) DESCRIPTOR component, achieving topology description — resources (roots) associated with protocols, functionality and governance rules, combined...
This paper presents an Internet based SCADA platform for monitoring the structures of a hydropower plant. The remote monitoring system communicates through TCP/IP sockets with the embedded gateway module interfacing the sensor network, facilitating configuration of the sensors, acquisition and archiving of the measurements, visualization of the data in real-time or of the archived data, as well as...
Since 1950s, the surface electromyographic signals are used by most of the electrically powered prostheses. These signals are collected from the skin surface and used indirectly as reference signals for the controller of the prostheses. Due to the nature of these signals it is impractical to feed these signals as inputs directly into the controller. The signals should be processed first, by segmentation,...
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