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This paper introduce a design strategy that utilizes the passivity concept in order to develop a combined controller-observer system for Permanent-Magnet synchronous Motor (PMSM) speed control using only rotor position measurement and voltage applied to stator windings. The load torque is unknown, therefore it must be estimated. To this end, first a desired energy function for the closed loop system...
Modern micro-grid needs to integrate all possible and economically attractive renewable energy resources. In many cases these generations are not smooth in nature and are situated in remote locations where regular maintenance is difficult. This paper proposes a brushless generation system using a dual stator winding induction generator (DSWIG). The power winding of the DSWIG is connected to the grid...
With increasing demand for energy, there is a growing tendency to employ renewable sources such as wind energy. Using large amounts of energy from wind arouses critical issues such as voltage variation and poor quality power supply. Several papers have been published on suggestions to improve performance of wind turbines during grid fault; however, to the authors' knowledge only a few papers address...
This paper proposes a hybrid parallel three-level converter topology for large wind turbine generation (WTG) systems and its control method. The proposed topology focuses on a machine side of a back-to-back converter. It consists of one conventional three-level neutral-point clamp (NPC) converter and numerous reduced-part converters, which are connected in parallel depending on rated power of a WTG...
Permanent magnet (PM) vernier machines have shown promise in electric vehicle applications as they offer high torque density and low speed/high torque operation by introducing flux-modulation poles that modulate the high-speed armature rotating field and the low-speed PM rotor field. The non-overlap single layer windings provide a cost-effective design variation that eases manufacturing, reduces torque...
Combined Star-Delta windings in electrical machines result in a higher fundamental winding factor and cause a smaller harmonic content. This leads to lower I2R losses in the stator and the rotor winding and thus to an increased efficiency. In this paper, a calculation method is presented to determine these I2R losses for three-phase induction machines with combined star-delta windings. An important...
Design of modern Wind Energy Conversion Systems (WECSs) must take into account two crucial aspects: efficient control strategies and reliable monitoring and diagnosis techniques. Wind turbine generators based on Wound Rotor Induction Machine (WRIM) is actually the preferred technology mainly because of the lower rating of the power converter connected to the rotor side. With the association of a back-to...
Control of phase current is an integral part of operation in Switched Reluctance Generators (SRG). Since machine windings experience a substantial back-emf during generation, stator phase currents tend to increase even after the phase is turned off. This in turn necessitates an oversized converter, thereby increasing the cost and overall size of the system. Moreover, due to variations in speed of...
A novel 12/10 axial field SRM with segmental rotor and single teeth stator is investigated, which is proposed for high torque performance within reducing copper volume. This paper presents the machine topology, which base on the axial field to permits use of short pitched windings placed around a single teeth stator. This concept improves the torque capability of the previous design, but uses much...
A high frequency injection (HF) based sensorless Sliding Mode Control (SMC) for Permanent Magnet Synchronous Machines (PMSMs) is designed. An analytical analysis, which demonstrates that the HF band is perturbed under sensorless operation, is addressed. Further increase of the sensorless control dynamics is achieved by removing the perturbed signals by means of compensation terms, which also estimate...
The measurement of induction motor air-gap flux and rotor speed using flux search coils along with stator windings is a known technique used for variable speed operation of three phase induction motor. The use of stator windings as search coils for sensing air-gap flux was not well received in the industry due to difficulties in signal processing of the sensed rotor voltage signals. This paper discusses...
A new topology for integrated on-board battery charging is proposed in this paper. A symmetrical six-phase machine and inverter, which are used for propulsion, are incorporated into the charging process. The configuration achieves power transfer through the machine without developing an average torque in it during the charging mode. Additional degrees of freedom of six-phase machines are explained...
Many attempts have been made on fault diagnosis of induction motors based on frequency and time domain analysis of stator current. In this paper, first the Park's vector transformation and frequency analysis for fault detection of induction motors are introduced. Then a smart approach using Adaptive Neuro Fuzzy Inference System (ANFIS) is proposed. This approach uses the time domain features derived...
Dual stator winding induction generators (DSWIG) can provide controlled excitation and hence offer a brushless alternative to traditional synchronous machines or doubly fed induction machines (where a 2nd supply is injected to the rotor through a converter-inverter systems). These generators are a potential candidate for extraction of power from renewable energy resources such as wind, micro-hydro...
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