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A novel quadratic buck-boost DC/DC converter is presented in this study. The proposed converter utilizes only one active switch and can step-up/down the input voltage, while the existing single switch quadratic buck/boost converters can only work in step-up or step-down mode. First, the proposed converter is analyzed in steady-state. Then, its performance is validated using simulations in MATLAB/Simulink...
This work presents a research on creation new career opportunities in the electrical engineering education. The new generation of qualified engineers from EU and EU Neighborhood regions will bring up economics not only in Latvia, but also in EU and EU Neighborhood regions. The creation of innovation based training modules for electrical engineers in energy saving technologies in cooperation with Central...
The application of Gallium Nitride (GaN) power transistors in a single phase inverter for photovoltaic (PV) systems is presented inverter. The power of the system is 2 kW. For both stages (DC boost stage and inverter stage), a very high switching frequency of 250 kHz is used. By this, a highly compact design for the inverter (200 × 150 × 80 mm3 / 2.4 l) was reached. The power to weight ratio corresponds...
Modern power semiconductor devices have low capacitances and can therefore achieve very fast switching transients under hard-switching conditions. However, these transients are often limited by parasitic elements, especially by the source inductance and the parasitic capacitances of the power semiconductor. These limitations cannot be compensated by conventional gate drivers. To overcome this, a novel...
This paper is focused on the analysis of the geometrical deviation of a variable reluctance (VR) resolver and its impact to the inverter losses for automotive applications. Therefore a VR resolver model is introduced, verified with measurements at a sensor test bench and the additional inverter losses are investigated.
This paper presents a special two-phase transverse flux machine with disc rotor. Because of the noncomplex construction and by using simple 2D flux path and 3D printing methods the manufacturing costs are hold low. A design criterion is proposed for maximizing the torque density in the low speed range. To prove the concept and analyse the potential of this construction a first direct driven prototype...
Interior permanent magnet synchronous motors (IPMSMs) are currently widely utilized as traction motors. The permanent magnets used in IPMSMs are an important factor; thus, high-coercivity permanent magnets with lesser rare-earth elements are in development. This paper proposes two modified versions of double-layered IPMSMs containing a strong magnet to improve their efficiency and reduce their size...
This paper proposes a novel approach to photovoltaic (PV) module level power electronics (MLPE). Functionally, it is a hybrid of PV power optimizer and microinverter with such key features as shade-tolerant (or global) maximum power point tracking (MPPT), galvanic isolation, direct AC connectivity, PV module level monitoring and safety cut-off, flexibility of installation and PV power system sizing...
In this paper, DC-DC power converter based on Galium Nitride Gate Injection Transistors (GaN GIT) is presented. The use of such power devices allows to increase of switching frequency and to reach high efficiency. Efficiency measurements of power conversion were carried out for two switching frequencies (100 kHz, 200 kHz, 400 kHz).
Energy saving is arguably the most important factor in issues regarding energy and carbon emission. For electric vehicles in particular, saving energy extends the driving range. This can be achieved with a highly efficient variable-speed drive that can cover a wide speed range, and changing the number of poles is one way of realizing such a drive. In addition, electric vehicles must be fault tolerant...
This paper is focused on the analysis of voltage source inverter (VSI) loss model for automotive applications. The converter is generally integrated in a thermally challenging environment and requires therefore a reliable, modular and accurate model for their evaluation. This work analyses first the current methods for the evaluation and the calculation of the losses and then present different solutions...
The article deals with power density analysis for machine tool multi-machine system power converter through the definition of recuperated energy returned to the DC link. Recuperated energy absorption in different operation modes was shown. Power density improvement is shown in case of active voltage rectifier implementation.
The very high voltage ratio has been achieved by introducing the switched-coupled-inductor to the quadratic boost converter and combining it with the diode-capacitor Dickson multiplier. The operating principles and steady-state analyses of continuous conduction mode are performed. The formulas to calculate the maximal voltage stresses on the transistor and on the diodes are provided. Simulation and...
A MIMO1 current-control approach for 3-phase grid connected inverter systems in the abc-frame is proposed. Redundant states are eliminated and the system is controlled via an explicit MPC2-approach. To achieve steady-state accuracy, the system-model is augmented by a simplified grid-model to obtain a high dynamic control structure, which supersedes the use of resonant controllers and coordinate transformations...
This paper presents an interleaved multiphase hybrid buck-boost DC/DC converter. This converter type provides high efficiency and can be used for applications with wide voltage conversion ratio. At the beginning, the circuit function and the design of a single-phase converter is described. With a multiphase design, the filter circuit effort can be significantly reduced. In these circuits the different...
In this paper, a novel bridgeless Flyback power factor correction rectifier is presented. Two active power switches, rather than the line-voltage diode bridge, are used to provide the bidirectional power flow. In comparison with the existing Flyback rectifiers, the proposed topology uses less number of transformer windings which simplifies the complexity of implementation in terms of magnetic utilization...
Storage is an important domain of the energy sector, with its traditional, classical solutions for smaller and larger amounts of energy. Energy storage has become of higher importance in relation with the development of alternative energy sources, called also renewable sources. The future energy systems will be based more and more on accumulation in the context of the development of so-called smart...
Supplying 25 kV, 50 Hz railway systems is a challenging task due to the load characteristics of those systems. Hence, several approaches are developed to improve their grid integration with the static frequency converter based substations. However, this supply system can be further refined by the application of a dc grid. Hence, this paper presents and discusses one possible approach to enhance the...
Comparative tests for efficiency of a drive equipped with reluctance synchronous motor and induction motor is the subject of the paper. Efficiency was determined for drives operating with constant torque. Test results indicate that use of the drive equipped with reluctance synchronous motor offer lower consumption of electric power in relation to the drive equipped with induction motor of the same...
Interior permanent magnet synchronous motors (IPMSMs) are used in various applications. Because of concerns about environmental problems such as global warming, IPMSMs are investigated to improve the efficiency to save energy. Magnetic steel sheets are commonly used in IPMSMs, and the use of low-iron-loss materials in IPMSMs to improve their performance has recently been examined. In this study, the...
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