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The presented paper deals with modulation strategy of the matrix converter. Attention is paid to the indirect space vector modulation (ISVM) that is based on the virtual dc link concept. The 3D space for selection of the modulation index is being often overlooked. In this article it is discussed in detail.
This paper deals with a complex energy harvesting system which generates electric energy from its surroundings. The source of an ambient energy can be available in the form of solar, thermal or mechanical energy. The paper is focused on the energy harvesting from mechanical energy of vibrations. The mechatronic approach was used for development of the energy harvesting source which harvests electrical...
Distributed power generation systems (DPGS) such as wind and solar become more and more widely spread. As a consequence grid operating companies demand system services. As part of the general fault ride through (FRT) requirements this paper deals with low voltage ride through (LVRT) capability of a three-phase-four-wire grid-tied solar inverter. The standard system will be described and necessary...
Extended Kalman Filter (EKF) has been a popular approach in localization of a mobile robot. However, the performance of the EKF and the quality of the estimation depends on the correct a priori knowledge of process and measurement noise covariance matrices (Qk and RK, respectively). Imprecise knowledge of these statistics can cause significant degradation in performance. In this paper, the Adaptive...
Modern electrical induction machine drives demand highest torque dynamic with well-defined guidance of the stator flux at the same time. The stator-flux-oriented Indirect Stator-Quantities Control (ISC) satisfies these criteria in the full operating range. Actual control systems with high processing power are able to utilize all advantages of ISC.
This paper compares and analyzes two control methods (pulse width and phase shift modulation) for a new type of step-up DC/DC converters with galvanic isolation - the quasi-Z-source inverter (qZSI) based DC/DC converter. The proposed converter is suitable for applications, where the wide range of voltage gain is demanded, e.g. with renewable energy sources (fuel cells, photovoltaic cells), in telecom,...
This paper presents the selection and the implementation of a model based predictive speed control - the Generalized Predictive Control - for a drive system with torsional loads. In drive applications where long or thin drive shafts are used torsional oscillations can occur due to the finite torsional stiffness of the shafts material. These unwanted oscillations can stress both mechanical and electrical...
This paper presents the required steps for the multiphysics acoustic simulation of electrical machines to evaluate its noise behaviour. The proposed scheme is of particular interest for the design and development of electrical drives for full electric vehicles (FEV), because it allows predicting the acoustic characteristic before building a prototype. This numerical approach starts with the electromagnetic...
This paper proposes a solution to tune an observer keeping robust closed loop performances for the sensorless motion control of an uncertain mechanical load directly driven by a PMSM through a flexible axis. An evolutionary algorithm optimizes the observers degrees of freedom. Experiments show that performances are effectively maintained.
This paper presents a new method to improve the DC voltage response on the load change of a three-phase power converter space vector PWM with current regulator. The line current reference is generated from the load current referred to as control-side and the output of PI controller driven by DC voltage error. The load current estimation can be obtained by using the Luenberger observer. A simplified...
In order to implement magnetic guidance in a long primary linear motor, the measurement of the airgap and yaw angle is required. Usual gap sensors deliver the signal and require power supply in the moving part. In this case, a power and data transmission system is necessary between the mover and the stationary controller. In addition to the magnetic guidance, a new type of capacitive sensor system...
The unbalanced magnetic forces which act upon the rotor of a salient-pole synchronous generator due to eccentric motion of the rotor shaft in the presence of magnetic field originating from the field current in no-load operation have been calculated using finite-element method. The displacement of the rotor has been modeled using the actual shaft orbit recorded on a 5 MVA salient-pole generator driven...
If a Predictive Torque Controller neglects the saliency of a machine the resulting prediction error contains the rotor angle information. A scheme to extract this information is derived in linear theory and extended for the nonlinear effects of a real reluctance synchronous machine. Measurement results confirm that this saliency based approach without signal injection is able to operate in the entire...
Regenerative brake of railway electric vehicles is effective only when the electrical load exist near the regenerating train on the same line. To avoid regeneration cancellation, hybrid energy source with energy storage is effective solution. In this paper, the effective use of regenerating braking and the expected electricity storage technology for further energy conservation in the electric railway...
This paper presents an analysis of planar magnetic element configurations in order to reduce capacitive couplings between the windings. The investigation and simulation results, both 2D and 3D Finite Element (FE) show the effect of shifting the planar layers in reduce the capacitive couplings. The simulation results are compared with test results to validate the proposition.
This paper surveys some basics of the electric vehicle and battery charging technology. The focus is on battery charging technology and battery modelling for application in electric vehicle. Two different modelling methods are surveyed in the paper: steady state modelling and dynamic modelling of the batteries. Consequence of fast charging on the round trip efficiency is shown on steady state and...
This paper proposes the theory and application of a new designing method of the Fractional Order PID (FOPID) controller for boost converters. FOPID is a PID where the derivation and integration orders are of fractional order rather than integer. A FOPID is an extension to classic integer order PID controllers, that potentially promises better results. The method is based on the use of a Multi-Objective...
This paper presents a new topology for a high voltage 50kV, high frequency (HF) 20kHz, multi-cored transformer. The transformer is suitable for use in pulsed power application systems. The main requirements are: high voltage capability, small size and weight. The HV, HF transformer is the main critical block of a high frequency power converter system. The transformer must have high electrical efficiency...
The paper deals with the behavior of a rectifier with thyristors as part of a power group. Data acquisition systems and original software are used. Information on the standards used for the equipment construction and numerical processing are provided. Two distinct power-related theories are discussed when applied to distorting and/or unsymmetrical regimes. The harmonic decompositions based on Fast...
In the paper a concept of generator for ship electric network based on squirrel cage machine driven by propeller shaft is proposed. Electric energy generated by a squirrel cage machine is double converted because of variable shaft speed. Problems of sensorless control of generator as well as specific starting and initial excitation procedure were analyzed. Presented results of simulation investigations...
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