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This paper presents a novel structure of high step-up DC/DC converters intended for distributed generation systems such as fuel cells and photovoltaic (PV) systems. Proposed topologies integrate the classical Y-source impedance network with different step-up cells to acquire strong boost ability which is unmatched by existing impedance networks. Compared to Y-source, proposed converters reserve versatile...
In this paper, the structure of indirect matrix converter (IMC) is presented and the space vector pulse width modulation method (SVPWM) is analyzed to apply for this converter. The advantage point of IMC is directly connected a load to a three-phase power source using six bidirectional switches and twelve unidirectional switches without using any intermediate energy storage element. IMC stands out...
In this paper, a hybrid topology of series-connected passive-active rectifiers is proposed for offshore wind energy conversion systems (WECSs). In particular a combined structure of a voltage-source converter (VSC) and a diode rectifier (DR) is connected to a double-star permanent magnet synchronous generator (2S-PMSG) reducing cost and losses. Nonetheless, the current harmonics due to diodes behavior...
In this paper, selection of optimum DC link capacitor for Integrated Modular Motor Drives (IMMD) is presented. First, a review of IMMD technologies is given and current research and future prospects are studied. Inverter topologies and gate drive techniques are evaluated in terms of DC link performance. The urge for volume reduction in IMMD poses a challenge for the selection of optimum DC link capacitor...
A novel integrated dual-Mosfets Forward micro-inverter is proposed in this paper to overcome the shortcomings in the existing photovoltaic micro-inverter. An inductor is connected in series to the primary side of the transformer and the leakage of transformer can be viewed as a part of the inductor. The performance of proposed micro-inverter is compared with the classical Flyback and Forward micro-inverter...
This paper presents two configurations of dual-input (DI) or three-port (TPC) isolated dc-dc converters for hybrid renewable energy systems such as photovoltaics and batteries. These two converters are derived by integrating an interleaved boost converter and a single-active bridge converter with an ac inductor as a power interfacing element or phase-shift soft-switching converter with an output dc...
In this paper three different magnet configurations, e.g. single V-shape, double V-shape and delta-shape are investigated in the integer-slot 48/8 and fractional slot 36/8 interior permanent magnet synchronous machines (IPMSM). An optimization procedure for maximizing torque per ampere is used to compare these six motor models under the same output torque levels. The torque qualities at both low-...
One main target in modern design of mobile working machines is the reduction of hydraulic oil in the on board actuator systems. This results in making the systems more environmentally friendly and leads to the idea of replacing the hydraulic actuators by electric actuators. Here this approach is presented by implementing electrical tubular linear actuators in a sickle bar, which is coupled with a...
The slotless BLDC motor is one of the most efficient motor in the fractional horse power range. However, the demand for higher performance, incessantly growing, asks for break-through improvements. A solution to achieve better performances is to use windings printed on a flexible PCB, allowing more elaborated winding shapes and topologies. In this paper, a new winding topology is introduced and compared...
In this paper an analytical model is presented to demonstrate the performance of a dual wound three phase surface permanent magnet synchronous machine. In addition to normal operating conditions, the model is extended to explain various fault scenarios of the machine. Self and mutual inductances of a dual wound machine with double layer winding are analytically calculated from winding function and...
The switched reluctance machine (SRM) has seen a lot of interest due to its simplicity and ruggedness. Much attention have been paid in academia to improve on some of the disadvantages of the technology such as torque ripple, acoustic noise and low torque density. In this paper a topology, namely the double U-core SRM, is reviewed. This topology improves on some of the disadvantages of the regular...
Although windings with various numbers of turns per coil have been presented in several papers in the past, a closed theory on applying different turn ratios in electrical machine windings has not been published yet. Conditions under which different turn ratios can be used to improve the MMF spectrum of electrical machines are therefore discussed in this paper. Analytical expressions for winding factors...
A family of DC/DC step-down converters with quadratic voltage transformation rate with only one low-side active switch is presented. The most promising topology using coupled inductors with pronounced step-down ratio is analyzed in detail. The circuit is especially useful for higher input voltages when diodes are used, which have lower losses than the active switch. The current and voltage waveforms...
The 3-phase diode bridge rectifier has the least line current distortion among 6-pulse rectifiers; however, its total harmonic distortion (THD) of 31.08% violates power quality standards. This paper reports distortion reduction by lowering magnitudes of harmonics in the line currents using a delta-wye transformer between the 3-phase utility and the diode bridge rectifier. The leakage inductances of...
The brushless doubly-fed generator (BDFG) has the advantages of brushless structure, variable-speed constant-frequency operation, flexibly controllable active and reactive powers, low converter capacity and cost, and so on, which is very suitable for the wind power generation, especially the large wind turbines and offshore wind farm [1].
Variable flux reluctance machines (VFRM) are an interesting candidate to substitute permanent-magnet synchronous machines in many applications, mainly owing to the absence of rare-earth permanent magnets and improved field weakening capability.
Permanent magnet synchronous machines (PMSMs) have been best choice for the applications which require high torque density, efficiency and performance.
Soft magnetic composite (SMC) material is a new soft magnetic material, now it is popular in the designing of permanent magnet machine where high operation frequency and 3-D flux path required, due to its advantages of low eddy current loss and magnetic isotropy.
This paper proposes an axial flux magnetically geared (AFMG) permanent magnet (PM) machine for power split application in hybrid electric vehicles (HEVs). The proposed AFMG machine has the merits of simple structure and improved torque density by combining a magnetic gear (MG) with a PM machine. The machine can realise power split without changing the function of MG and PM machines. The input mechanical...
This paper presents two techniques to monitor the voltage of the submodules of the cascaded high-frequency AC link (CHFAL) system. The first proposed technique is using the adaptive linear neuron (ADALINE) algorithm, and the second proposed technique is using the recursive least square error (RLSE) technique. Both of the two submodule voltage monitoring techniques need only one voltage sensor per...
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