Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
This paper introduces a concept for bringing dependability into the area of building automation. The proposed approach is able to extend existing building automation networks with dependability features. For this purpose, the communication stack of a particular system is extended by adding an intermediate layer. This so-called dependability layer is transparent to allow seamless integration. Thereby,...
In a DC-AC system, some problems may threaten the reliability of the whole system, such as the shoot through issue and the failure of reverse recovery. Some methods are proposed to improve the reliability of the converters. The dual buck inverters can solve the above problems without adding dead time but the dual buck topology has a main drawback of low magnetic utilization which increases the volume...
An improved bidirectional medium voltage AC-DC converter based on 10kV silicon carbide (SiC) MOSFETs for SST (Solid State Transformer) application is presented in this paper. Avalanche breakdown of the reverse blocking silicon diode and bridge arm shoot-through problems in traditional high voltage bridge-type AC-DC converters are solved. Shoot-through currents are limited to low di/dt events that...
In an inversion system, high reliability is one of the main targets pursuing. Some problems will threaten the reliability of the system, such as the shoot through issue and the failure of reverse recovery. The dual buck inverters can solve the above problems without adding dead time but the low magnetic utilization increases the volume and weight of the system. This paper firstly reviews the traditional...
In the smart-grid era, distribution power systems are undergoing a great deal of renovation. Utilities, more than ever before, are adopting technologies that aim primarily at enhancing the reliability of the power delivery systems in a safe and sustainable manner. In this paper, we analyze the reliability enhancements that distribution automation technologies bring to power distribution systems. We...
This paper considers the problem of network monitoring and management in distributed wireless industrial control systems. The urgency of the implementation of management and monitoring systems in such networks is stated. The possibility of using network management architectures known from general purpose networks is shown. Usage of a mixed approach to realize monitoring and management system in wireless...
Module Integrated Converters (MICs) are one of the most reliable solutions for the partial shading effects problem in Photovoltaic (PV) systems. There are number of converters employed as DC-DC converters in MIC structures. Among them, buck and boost converters are more favorable because of their simple implementation, reduced part counts, high efficiency and easy control. In this paper a comparison...
In recent days, the quality of power has become more important to the most of the customer load. The unified power quality conditioner (UPQC) is the ultimate solution to provide the quality of power irrespective of the type of power quality problems. The UPQC can improve the quality of power for all end users, but it will not provide the power quality at different demand levels. Another topology Open...
Today's important industrial energy seeks maximum benefit with maximum reliability. In order to achieve this goal, design engineers depend on reliability optimization techniques. This work uses an ant colony algorithm (ACO) meta-heuristic optimization method to solve the problem of wind power system design optimization. We consider the case where redundant electrical components are chosen to achieve...
The electric power distribution system of solar system delivers power to the customers from a set of distribution substations. While the transmission lines are configured in a meshed network, the distribution feeders are configured radially in almost all cases. The proposed problem in this work is to determine the optimal topology among a various alternatives. This problem is known as a problem of...
Modular Multilevel Converters (MMC) have been considered an attractive option for medium/high-power applications due to their reliability and power quality. The MMC operation relies on voltage balancing. Consequently, many researchers have addressed the issue of voltage balancing and developed several schemes and controlling methods for this issue. This paper presents two approaches to control the...
Growth of elderly population induces the increasing demands for high-quality healthcare services, wireless body area networks (WBANs) has emerged as a promising solution for monitoring of patients vital life signs parameters. Reliability and extending the lifetime are considered amongst the important and challenging issues in WBANs. The standard IEEE 802.15.4 is considered as the most used MAC protocol...
A novel iterative algorithm for designing the architecture of broadband wireless networks along the long highways is considered. The mathematical problems were formulated and solved for every step of the iterative method. An example is given of designing a broadband wireless network along the highways in one of the regions of Russia.
Distribution network reconfiguration is a multi- objective and discrete nonlinear combinatory optimization problem. In this paper, a novel multi-object distribution network reconfiguration method is proposed based on system homogeneity. Firstly, the relationship between power loss and reliability of systems with different homogeneity is analyzed. Then, to enhance system reliability and homogeneity,...
Bulk electrolytic capacitors are used in single phase inverters to reduce the ripple in dc link voltage which is due to the pulsating nature of the instantaneous power. The reliability of an inverter is limited by the lower lifetime of these capacitors. In addition, the switching devices also deteriorate the reliability, due to their significant failure rate. In order to improve the overall reliability...
This paper investigates the reliability of different topologies of grid connected photovoltaic (PV) systems. The topologies considered in this study are centralized topology, string topology and multi-string topology. The reliability of each topology is evaluated by using suitable reliability indices that are based on calculating the probability of different operating states. These states are evaluated...
DC distribution network will be widely used in the future with more integration of distributed generation. However, development of DC distribution is hindered by lack of appropriate circuit protection technologies. Certain protection schemes are studied in this paper, and used to detect and isolate the fault on the distribution lines and bus-tie line. The instantaneous overcurrent protection and the...
Photovoltaic plants are complex systems operating in variable conditions. Their performances can be deteriorated by many factors such as shadows and mismatch phenomena. In this case, a suitable device able to control and condition the produced power is needed. A power optimizer could represent an adequate solution since it is capable of regulating the PV generator output impedance to reach the maximum...
The concept of creating of the embody reliability in design of cyber-physical systems, using novel techniques based on the combinatorial configurations, including two- and multidimensional Ideal Ring Bundles (IRB)s is developed. These design techniques make it possible to configure cyberphysical systems with fewer elements than at present, while maintaining or improving on resolving ability, structural...
We describe the design, implementation and testing of the Component-Based Reusable Adaptive Mitigation (COBRAM) system, which is designed to mitigate attacks against control plane protocols at the MAC and routing layers of mobile wireless networks. The main parts of the COBRAM system are: (1) a set of extensible mitigation techniques that modify or extend a node's protocol components to resist attacks;...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.