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Dual stator winding induction generator, being brush-less and magnet-less, has been found to be suitable for remotely located wind-electrical systems where maintenance becomes a key issue. Since this generator has a squirrel cage rotor and two distributed stator windings, manufacturing process is simple and system becomes rugged. Both the windings may contribute active and reactive power when operated...
This paper presents a Lorentz actuator, which generates repulsive levitation and propulsion forces using only one permanent magnet. It provides a compact and cost-effective solution for magnetically levitated planar systems. Based on the proposed Lorentz actuator, a novel six degrees-of-freedom (6-DoF) magnetically levitated planar positioning system will be presented. The main advantage of the proposed...
Inter-turn insulation failure in induction motor results in complete or developing winding short circuit. Stator winding fault leads to an unbalance in the three phases of the motor leading to a faulty induction motor with increased time and space harmonics of flux. This can lead to uneven distribution of air gap flux and increase in torque ripple. The condition is worsened due to an unbalance in...
In recent days, the necessity to condition monitoring and maintenance has increased to a greater extent. Even though there are various main components available in the induction motor, bearing is something crucial where we need to concentrate. Hence the fault occurs in the bearing has to be paid more intention. In most of the cases, holes had been formed in the bearing of the induction motor for fault...
Current control method for single phase LCL grid connected inverters is presented. The controller is designed as a combination of feed-forward and sliding mode control. While feed-forward will play the main role in the steady state, the sliding mode controller will be active in case of parameters uncertainties and/or disturbances. The pulsed nature of the pulse width modulator is taken into account...
In today's portable devices, major DC-DC topologies are mixed and matched to provide multiple DC rails to power point of load (POL) rails. The traditional high frequency DC converter approaches to achieve high efficiency have their strengths and draw backs, and none of them could be considered ideal solution to energy efficiency and battery run time issues of modern portable devices. Supercapacitor...
The high frequency voltage oscillation on the DC/DC gate driver of a H-bridge created during the turn-off intervals of the power switches has critical impact on component reliability and control quality. This noise can propagate freely in the low power plane to other functional circuits of the converter due to the performance degradation of EMI filter in high frequency range above 30MHz. In this paper,...
The fuel cell systems are considered as current intensive sources with low output voltage, so power electronic converters are essential part of fuel cell applications. A dc/dc converter with high voltage ratio and low stress is developed in this paper. The inductors of the output series interleaved boost converter (OS-IBC) are interleaved in parallel at input which can reduce the input current ripple...
A new one-switch three phase power factor corrected (PFC) rectifier is presented in this paper. The proposed 3-phase ac-dc converter is based on Ĉuk topology. Proper feedback control of the circuit can maintain high power factor and low input current total harmonic distortion (THD). Use of minimum number of control switch in the proposed power conversion circuit reduces components, drivers drive isolation...
Solar energy is a promising alternative energy source for a sustainable pollution-free future. Due to the requirements of high efficiency, reliability, power density and low cost, transformerless PV inverters can be utilized in a grid-connected solar energy system. However, this suffers from no galvanic isolation and leakage currents through the stray capacitances between the PV array and the ground...
This paper discusses a cost-effective technique for dynamic testing of DC-DC power supplies, based on the injection of a signal into the feedback loop of a DC-DC regulator, which makes it operating as a dynamic source or a dynamic load. The theoretical background and the practical implementation of the technique are investigated. Guidelines are provided to determine the static set-up and the bandwidth...
An input switch based modular Single Ended Primary Inductor (SEPIC) three phase AC-DC converter is proposed in this paper. The proposed rectifier has the advantage of step-up/down voltage gain with boost input stage. Input boost stage allows input current shaping accompanied by power factor correction. The topology will also provide possible capacitive isolation of input/output sides of the converter...
The synchronous reluctance motor (SynRM) is gaining popularity for general purpose drivers, where the sensorless operation is important. It is well known that, at low-speed, the saliency of these machines can be exploited for sensorless control down to stand-still through high-frequency (HF) signal injection. Nevertheless, the use of a separate HF model makes more complex the integration with the...
Accurate state of charge (SOC) is critical for battery energy management system in electric vehicle (EV) application. Overcharge and over discharge will shorten battery's lifespan and induce potential safety problem, which may even permanently damage the lithium-ion battery. Thus, a data driven model is proposed for improving the accuracy of SOC estimation in this paper. A preliminary mathematic model...
Several factors affect the power generation efficiency of wind energy extracted from wind turbines. One of them is dust accumulation resulting in roughness of the blade surface and resulting in power loss. To overcome this problem, wind turbine blades need to be cleaned frequently. There are some existing techniques of cleaning but not very efficient and economically viable. In this paper, we have...
This paper presents the modeling and control of wind system using the permanent magnet synchronous generator (PMSG) connected with the grid via a three phase converter AC/DC/AC through LCL filter. The objectives of the control are: (i)forcing the generator speed to track a varying reference signal, (ii)assuring a satisfactory power correction (PFC) respecting to the power supply grid, (iii) regulating...
A novel single phase ac-ac converter with no LC input/output filters is presented in this paper. The proposed converter has all the advantages of the previous single phase impedance source ac-ac converters; it can operate in buck/boost and in-phase/out-of phase with the input voltage, that makes it appropriate for voltage sags/swells compensator without any dc storage. A coupled transformer based...
This paper shows implementation of an explicit linear model predictive control (MPC) of surface mounted permanent magnet synchronous motor (SMPMSM) on field-programmable gate array (FPGA) and dual-core processor. The most notable advantage of an MPC algorithm, in comparison with standard field oriented control (FOC), is the correct constraints handling and natural way of control objective definition...
The paper presents a method to estimate the rotor position, speed and load torque of the PMSM drive. Estimation is based on an extended dynamic model of the PMSM and is done using sequential observers. A first observer estimates the EMFs of the motor; these are used to compute the rotor position angle. The EMFs along with the angle are used as inputs to a second observer which estimates the speed...
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