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A comparative analysis between a DC power transformer and a DC power gyrator on equal bases of operation is presented. Both approaches are used to solve the problem of maximum power transference from a PV panel to a DC load. An outdoor measurements system has been implemented and comparative experiments have been carried out during six hours. Results show that both approaches are practically equivalent...
This paper examines the system design of a range of RF amplifiers for Science and Industry that are in an advanced stage of development at e2v. It describes how traditional industrial motor drive power electronics and modern industrial high voltage converter design have been integrated into a compact modular unit and how system control and monitoring is achieved via a new generation of embedded, real...
Pseudo sensorless permanent magnet synchronous motor torque and flux tracking control algorithm is presented. Proposed approach addresses the problem of operation at zero, low and up to nominal speed. The information of flux is extracted using a nonlinear closed loop rotor flux observer combined with the information obtained from hall sensors, which allows operation at zero speed. The analysis of...
The rapidly increasing computation-capability, data-density and functionality of electronic systems are the driving forces for high-efficiency high power-density converters. Electronic systems are continuously increasing the demand for power, while simultaneously available space and cooling capability stays constant. This requires smaller form factors of the individual converter, higher efficiencies...
Coupled simulation environment is presented, where electrical machines are modeled by the finite element method (FEM) with circuit equations and coupled to converter models in a system simulator. The method is based on weak coupling, providing possibility for multiple time step levels in the system model. Examples concerning the analysis of current and voltage harmonics, additional losses and tooth...
The paper presents the combination of a lowspeed model ("INFORM method") and a specially adapted high speed model ("Voltage model or EMF model") for covering the full speed range of sensorless permanent magnet (PM-) synchronous motor drives. Both models generate "measuring information" for a linear observer, modelling the mechanical structure of the motor. A special feedback...
In this paper, the authors propose an approach with problems of electricity production in isolated sites for tropical countries. Indeed, the geographical context implies often that many populations live in rural areas and are in the majority located at the edge of the rivers. The originality of this work is hybridization with a photovoltaic system via a common direct current bus and a maximum power...
The paper presents an application of direct current control (DCC) method in a three-phase parallel active power filter. The power filter is employed to compensate fundamental reactive power and harmonic distortion of non-linear loads and due to its inverter-like topology with known parameters in filter branch, the predictive DCC method was implemented to reduce the filter's commutation frequency....
The paper deals with the new method of analysis of single-phase power electronic systems. Using a new particular transform theory the ordinary single-phase system can be transformed into equivalent two-axes orthogonal one. The new original thought is based on the idea that ordinary single-phase quantity can be complemented by fictitious second phase so that both of them will create orthogonal and...
This paper presents results of the analysis and design of a multi-phase buck converter with integrated filter inductor when operated with a wide range of voltage conversion ratios. Included are the analysis of the converter input and output currents to optimize the required filter capacitors, the analysis and design of the integrated filter inductor and results of a state-space controller that provides...
For reduction of the switching power losses developer of three-phase inverters thinks increasingly about discontinuous modulation strategies. This applies in particular for high power inverters such as for starter generator - or hybrid drive systems. The dc-link current of these discontinuous modulated voltage source inverter are analyzed in this paper. First the dc- and the rms-current of the dc-link...
This paper studies the approach of derivation of three-level (TL) half-bridge (HB) topology from conventional full bridge DC/DC topology. The derived TL HB topology has same device count and performance as the corresponding full bridge topology, and it is more suitable for high voltage applications. The derivation approach for different control method, i.e. PWM control, frequency control and phase...
This paper presents a design optimization of an axial flux permanent magnet synchronous machine (AFPMSM). The design optimization is performed using separately two different algorithms: a deterministic algorithm and a stochastic algorithm. The used DIRECT algorithm and genetic algorithm (GA) are described and tested separately to optimize a 10 kW/130 rpm AFPMSM. The obtained results by the two algorithms...
A kind of speed sensorless sliding - mode observers for induction motors has been developed. In this paper a new topology of such observer is investigated in order to determine its feasibility, robustness to parameter changes and practical applicability on digital signal processor. The positive feature of the proposed scheme is that it doesn't require the rotor speed feedback or adaptation, only measured...
Based on the conventional forward converter, the transformer's magnetizing inductance is made small, and a reset winding of the transformer is moved to the secondary side, and furthermore, the anode terminal of the freewheeling diode is connected at a different point. Then a novel topology of DC-DC converter is proposed, and its power efficiency is predicted to be improved. This converter has both...
This paper describes a hybrid fuzzy-conventional control technique of a linear induction motor. This technique, based on the use of the vector control method associated to a choice of combined analogical and fuzzy controllers, is proposed to ameliorate the dynamics of the secondary flux and the thrust force. The results of the numeric simulation are also presented and discussed
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