The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper reviews briefly the current scenarios where power electronics converters are being applied. In the paper, the main focus moves towards the high power applications, reviewing the different alternatives and topologies. The multilevel approach is studied in more depth, showing that is a good solution to the challenges that medium voltage-high power applications pose. Several industry examples...
Micro-grid can be defined as a low voltage distribution system to which small modular generation systems are to be connected. In some sense, a micro-grid corresponds to an association of electrical loads and small generation systems through a LV distribution network. This means that loads and sources are physically close so that a micro-grid can correspond for instance to the network of a small urban...
The global electrical energy consumption is still rising and there is a demand to double the power capacity within 20 years. The production, distribution and use of energy should be as technological efficient as possible and incentives to save energy at the end-user should also be set up. Deregulation of energy has in the past lowered the investment in larger power plants, which means the need for...
Undergraduate courses in electromechanical systems are usually oriented toward circuits representation of electrical and mechanical components of the system, being the materials reduced to the rigid body cases. However, the common use of personal computers and the availability of user friendly numerical software tools to solve partial differential equations provide the opportunity to generalize a...
An overview of various neural network architectures is presented. Depending on applications some of these architectures are capable to perform very complex operations with limited number of neurons, while other architectures, which use more neurons, are easy to train. There are neural network architectures which have very limited requirements for training or no training is required. The importance...
This keynote lecture overviews the modeling techniques for computer simulation of ground electrodes behavior, and discusses the design of tower footing and substation grounding systems. Their performance as regards safety as well outage rate is discussed. A comprehensive bibliographical survey is provided.
In this paper is proposed the implementation of a novel structure for a Class D amplifier based on a robust closed loop control. The proposed control it is based on a multi level sliding mode controller. This allows of being able to converge to a stable status in spite of unknown or nonlinear elements present in the amplifier. The methods and systems proposed are also described. Several simulation...
The modeling of grid connected voltage source converters results in a MIMO system with cross coupling between the two inputs and the two outputs. The usual approach is to design the two compensation controllers for the direct path and use a feed forward component to compensate the coupling. However, this term can lead to significant errors since the associated parameters can change in time. A controller...
Nowadays, high frequency waves have a so vital role in the industry. Cooking, pasteurization, defrosting, wood drying, etc. are some of the high frequency industrial applications. In this paper, an 800 W, 13.56 MHz radiofrequency heater has been designed, simulated and implemented. Variable loading is one of the major RF heaters problems. Usually, heaters have an optimum load in which they have their...
A detailed design procedure for a contactless power transmission system with high efficiency is presented in this paper. A phase-shift full-bridge converter is used in order to control output power and adjust frequency precisely at the desired value of resonance to gain soft switching advantages. In addition, it will be discussed how to use performance factor curves of ferrite cores to select the...
Energy systems are frequently based on imported fossil fuels, and this is a problem in different dimensions including, the environmental, the economic and the security of supply, the latter being particularly relevant for any isolated system, like Islands. Renewable energy is regarded as a solution to this problem, particularly considering its transformation in electricity but this does not include...
In recent years the possibility of incorporating type II high temperature superconductors (HTS) into power applications such as electrical motors, generators, bearings and fault current limiters has attracted much attention. Hysteresis superconducting motors offer the simplest construction and in this paper a drum and disc type configuration are considered. Comparison in terms of specific torque produced...
In this paper, an analytical approach is used to determine the Flux-linkage characteristic of regular Switched Reluctance Machines (SRMs) considering simple geometry aspects. The proposed method is derived from an 8/6 SRM magnetic characteristic obtained by experimental tests and validated by FEM results. In order to reduce calculation time and expense, regarding simulation and implementation proposes,...
This paper describes a mathematical model to determine the equivalent circuit parameters of Axial Flux Disc Machines (AFDMs) of whatever configuration. Once fixed the dimensions of the machine (magnet width, winding lengths, axial thickness, etc.), the equivalent inductance and resistance and finally the current are calculated, for a generator operation mode. The model has been implemented in a software...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.