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This paper deals with traction active current-source rectifier (ACSR) developed within the research into a new generation of main traction converters employing medium-frequency transformer dedicated for suburban units operating on both ac electrification systems of 25 kV/50 Hz and 15 kV/162/3 Hz. The new control strategy able to operate under distorted trolley-wire voltage and actively suppress (i)...
This paper deals with two different observers for sensorless DTC-controlled induction motor (IM) drives. First is sliding mode observer (SMO), second is extended Kalman filter (EKF). The main objective of this paper is experimental analysis of limits of these observers and their behavior in challenging low-speed region. Theoretical conclusions presented in this paper are verified by experiments made...
This paper deals with comparison of two different control strategies of traction single-phase current-source active rectifier from the viewpoint of robustness, computation demands, control possibilities, quality and limitations and implementation tasks. Proper function of considered controls has been verified by simulations and experiments on designed laboratory prototype of CSAR.
This paper deals with a developed software for design and optimization of variable speed drives (VSDs) for high-power water pumps and fans in power and heating plants. The paper presents the physical background of modeling and proposed models of a variable speed drive with frequency converter.
This paper introduces a new designed diesel-electric power-supply unit developed for military purposes. The power-supply unit is divided to two main electric parts, (i) input part which is composed of a sensorless controlled active voltage source rectifier supplied by a permanent magnet synchronous generator, and (ii) output part which is composed of a four-leg three-phase voltage source inverter...
The presented research deals with a new configuration of a main traction converter with medium-frequency transformer which is intended for modern multisystem suburban units and locomotives. This paper exactly introduces proposed control of primary voltage source active rectifiers with direct control of trolley-wire current and active damping of low-frequency disturbances at the converter ac side....
This paper deals with an Extended Kalman Filter (EKF). In the paper is described basic theory of filter and a functionality is proved on real laboratory prototypes. EKF is used for parameter identification of synchronous motor with permanent magnets on the rotor surface (PMSM) and for induction motor.
This contribution deals with a competitive control of the single-phase voltage source active rectifier based on a hybrid delta modulation. Main advantages of the presented control are a constant switching frequency of the converter, a direct control of the grid ac current and a harmonic grid current independent from waveform of the grid voltage. Proposed control is verified by simulations as well...
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