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.
Development of Hall thrusters for nano, small and low-power satellites below 100W is expected. In lowering Hall thruster power, the cylindrical-type Hall thruster is more advantage than conventional coaxial-type Hall thrusters. In this study, a very low power cylindrical Hall thruster was designed, and the thruster performance was measured. As a result, a stable operation was achieved even with 10W...
An alternating-current light-emitting diode (AC-LED) driver is implemented between the grid and lamp to eliminate the disadvantages of a directly grid-tied AC-LED lamp. In order to highlight the benefits of AC-LED technology, a single-stage converter with few components is adopted. A high power-factor (PF) single-stage bridgeless AC/AC converter is proposed with higher efficiency, greater power factor,...
A high-frequency photovoltaic pulse charger (PV-PC) for lead-acid battery (LAB) guided by a power-increment-aided incremental-conductance maximum power point tracking (PI-INC MPPT) is proposed. The PV-PC implemented by a boost current converter (BCC) is to eliminate sulfating crystallization on the electrode plates of the LAB and to prolong the battery life. The BCC associated with the PV module is...
This paper explores important characteristics of multiple-input converters (MIC) serving as a power electronic interface for renewable energy applications. Advantages of MICs are explained through an example with a photovoltaic (PV) system. Feasible MIC topologies for renewable energy applications are discussed and classified into four different MIC families. According to their different configurations,...
Energy consumption is rapidly increasing with advancing technology. For this reason, solar energy from one of the renewable energy sources should be laid on. Because it can produce electrical energy, such as solar energy, photovoltaic conversion could also be utilized as a source of direct heat. Photovoltaic energy from sunlight most of the systems, the modules are collected by means of, converted...
This paper presents a basic sensitivity analysis of the conversion losses in a dc microgrid by varying the system parameters. A simple residential apartment with 20 units with a photovoltaic (PV) system is taken for the analysis. The conversion losses are calculated with the measured electricity consumption and the estimated output of the PV system. Modelica, an object-oriented modeling language,...
Recently, owing to the savings of resource and energy, the use of microchannel chips in micro total analysis systems has attracted attention in the medical field. Generally, microchannel chips are composed of plastic or glass. Glass is stronger than plastic in terms of heat and chemical erosion resistance. However, currently, dies for manufacturing glass microchannel chips are not viable because they...
Recently, the use of microchannel chips in micro total analysis systems, which can provide savings of natural resources and energy, has attracted attention in the medical field. Generally, the photolithography technology employed in semiconductor manufacturing is used to manufacture microchannel chip dies. However, it involves several processes such as mask fabrication and the application of a photoresist...
So far, the operating characteristics of asymmetry type current resonant converter as LLC converter are discussed in detail. However, the detail operating characteristics discussions of symmetry type resonant converter have not been carried out. This paper investigates the AC characteristics of symmetry type bi-directional current resonant converter, and their soft-switching regions are also investigated.
Since the Great East Japan Earthquake, many people had been worried about power shortages in Japan. There has been more focus to installation of Renewable Energy Sources (RES). In Japan, PV system introduction is promoted by national policy of the government in 2012. However, the large amount of distributed generator causes voltage deviation beyond the statutory range in distribution system. Furthermore,...
Efficient utilisation of Storage Devices (SD) among multiple sources of dispatch within a typical microgrid have a substantial impact on reducing the economic and environmental generation costs in that particular microgrid. Eventually, managing the multiple sources that supply energy simultaneously is a big engineering challenge. The complexity rises due the uncertainty of demand, generation cost,...
In order to solve problems of global warming and depletion of energy resources, renewable energy systems such as wind generation is getting attention. However, wind power fluctuates due to variation of wind speed, and it is difficult to wind power forecast perfectly. Therefore, wind power developers should follow the strict condition for output power smoothing when wind turbine generators (WTG) are...
This paper clarifies the principle of the surge voltage in the diode rectifier that is connected to the transformer in the isolated DC-DC converter. In addition, the design method of the RC snubber circuit is discussed by using the equivalent circuit that is consisting of the transformer, the snubber circuit and the diode. Finally, the experimental results are provided to validate the design method.
This paper deals with a cost effective IPT wireless EV battery charger for smart house, which incorporates the simplest quasi -resonant soft switching pulse modulated inverter using the latest SiC-MOSFET into high-frequency isolated DC-DC converter.
Distribution power systems are radial in nature. Power flows in one direction from the utility to the load. Most protection, monitoring, and control devices are designed based on this unidirectional flow of power. Distributed generators (DGs) which are specifically renewable energy technologies, such as photovoltaic, wind-turbine and fuel cells are entering a stage of fast expansion. Hence, integrating...
This paper discusses suitability of a novel tapped-inductor converter for home DC power supply system. Advantages such as high efficiency, compact size, low cost and high reliability are achieved by the characteristics like the buck converter. A laboratory prototype of a coin size (34mm × 26mm × 5mm), which can convert the voltage from 48V input to 1.2V/30A output, was tested. As a result, maximum...
Physical meaning of the instantaneous space vector of salient permanent magnet synchronous machine is studied. For this purpose, we define real physical space vectors. The electromagnetic torque is derived by current and flux densities. A space vector diagram in transient state is derived and discussed.
This paper presents the development of hydraulic performance in a high head Francis pump-turbine runner which is adopted at pumped storage power plant. In order to achieve the improvements of turbine efficiency, pump efficiency and cavitation performance for turbine and pump mode throughout a wide operating range, a new runner was designed by the latest Computational Fluid Dynamics (CFD) analysis...
The European Commission is supporting many projects in the field of energy saving, with the aim to improve inhabitants behavior and to help Europe to meet emission targets. The objective of the Balanced European Conservation Approach - ICT services for resource saving in social housing (BECA) Project is to enable consumption reduction of key resources in European Social Housing by providing usable...
This paper presents the integration of the Fuel Cell (FC) and the SuperCapacitors (SC) in the distributed energy generation system such as the transport applications. This proposal is due to the present trend in the transport applications, knowing that the major drawback for these applications is the energetic autonomy problem. In this context, using the Fuel Cell and the SuperCapacitors with a performing...
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.