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 presents a novel design for double conversion UPS systems that results in higher power density, higher efficiency and more flexible parallelism for higher reliability. This design comprises a three-level circuit topology, a customized power semiconductor module and a cross current sensorless parallel control. The innovative circuit topology results in an UPS with higher efficiency and dramatic...
One kind of variable reactor is proposed. It consists of variable reactance converter and electronic power inverter. The topology and the impedance conversion mechanism of variable reactor are illustrated. And the variable reactor is simulated using Matlab/Simulink. The simulation results prove that the impedance of variable reactor can be adjustable smoothly and its higher harmonic content is small...
Efficiency and recuperation capabilities of modern electrical drives have become very important features within variable speed drive applications. Regenerative electrical drives are therefore usually equipped with cost extensive pulsed active front end topologies for the recuperation mode. Contrarily, the much cheaper fundamental frequency switched front end is used. It has no electrolytic capacitor...
The regulation of the output voltage waveform of a three phase inverter-filter system is ensured with a special compensation algorithm based on the instantaneous phase current and a pre-defined mathematical model. This algorithm compensates for inverter blanking time, zero-current clamping, and the cross-coupling inductive terms of the filter. Experimental results are observed for 50, 60, and 400...
Resistance welding is commonly used in many branches of industry. To perform the welding process high welding currents up to about 100 kA are required which are supplied by dedicated power electronic converters in pulsed power operation. Concerning electromagnetic compatibility (EMC) aspects of such equipment the new European standard EN 50240 has to be taken into account. In the paper adapted noise...
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.