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.
Single-phase grid-connected converters need to be synchronized with voltage/current fundamental component. This paper investigates and deeply evaluates four real-time estimators based on DFT, adaptive filter, least squares and SOGI, designed for high-quality 1st harmonic extraction. Presented theoretical results are confirmed by extensive experimental research made on developed converter prototypes.
This paper deals with two estimators designed for real-time fundamental component grid current extraction which is a critical task in control of single-phase active power filters (APF). An adaptive and predictive FIR filter and discrete Fourier transform have been employed in order to achieve proper APF operation, and thus, high-quality compensation of a distorted current drawn by a nonlinear load...
This paper deals with a main traction converter containing a medium-frequency transformer determined primarily for a new generation of suburban units operating on both ac electrification systems of 15 kV/ 16.7 Hz and 25 kV/ 50 Hz. The paper introduces proposed control of primary (trolley-wire connected) converters based on a predictive mathematical model and proportional-resonant controllers. A control...
This paper focuses on comparison of adaptive and predictive FIR filter-based and discrete Fourier transform-based current reference estimation for active power filters. Both estimation methods as well as a control algorithm of the single-phase shunt-type active power filter which is able to suppress harmonic currents drawn by nonlinear load are discussed. Performance and filtering quality are presented...
This contribution deals with a shunt-type active power filter designed mainly for railway applications (50-Hz and 16.7-Hz electrification systems) which is able to compensate undesired harmonic currents as well as reactive power. Its control algorithm employs an optimized DFT-based fundamental current and voltage estimator generating an accurate control reference signal. The APF configuration, the...
This contribution deals with a new configuration of traction converter with medium-frequency transformer for multi-system suburban units and locomotives. This paper introduces control of primary voltage source active rectifiers with direct control of trolley current, presents simulation and experimental results of designed low-voltage laboratory prototype of traction converter of rated power of 12...
This paper introduces control of single-phase voltage-source active rectifier with direct control of trolley-wire current and presents simulation and experimental results of designed low-voltage laboratory prototype of traction converter. The proposed control strategy combines PR controller with predictive model for trolley-wire current control loop.
This contribution deals with a new configuration of main traction converter for locomotives containing a medium-frequency transformer. The main emphasis is given on the proposed control of the converters around the medium-frequency transformer which transmits power using 400-Hz square-wave voltage. This paper describes designed control algorithms and presents theoretical conclusions, which are verified...
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.