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The following topics were dealt with: power semiconductors, passive components and packaging technologies; switching static power converters; switch-mode power supplies and UPS; application of power electronics in power systems and generation; power quality issues, harmonic analysis, design, control and applications of electrical machines and drives; aerospace applications; power electronics education...
The interest in adopting electric actuation in defense applications such as surface ships and submarines, as well as in a host of "more electric" applications, usually founders on the issue of the mass and volume of electric actuators, which are perceived to be significantly worse than those of competing technologies. Certainly looking at the volume, mass, power and torque of a typical 3...
Controlled AC motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. To replace the sensor, the information on the rotor speed is extracted from measured stator currents and from the voltages at the motor terminals. Vector controlled drives require estimating the magnitude and spatial orientation of the fundamental magnetic flux waves...
The paper gives a survey of the electric power utility industry, its background and culture together with the challenges that it has to be face. Just as the ubiquitous operational amplifier (or OP-AMP) plays an important role in low power engineering, the advance of high power electronics has at its disposal megawatt OP-AMPs which can be useful to the electric power utility industry in meeting the...
In recent years, high efficiency electric motors are demanded to meet the challenges of energy hungry world with limited fossil fuel sources. Interior permanent magnet (IPM) motors have been increasingly developed and widely used to meet the high efficiency and performance requirements. It is because; an IPM is a highly efficient synchronous motor with built-in advantageous features. This is due to...
A digital control technique for voltage regulation module (VRM) is investigated, which is based on a predictive current regulator. Due to the adaptive-voltage-positioning (AVP) of the VRM, the controlled variable includes a combination of output voltage and inductor current. Besides the predictive regulator, a disturbance observer is used for compensation of input voltage variations and any other...
In this paper, a simple and perfect speed tracking of direct torque controlled-induction motor drive using fuzzy logic is proposed. The fuzzy logic controller solves the problem of nonlinearities and parameter variations of induction motor. Unlike the conventional standard fuzzy logic controllers, the proposed controller has much less computationally demanding. The direct torque control scheme of...
This paper describes a simple control structure and dual outputted power conditioning system for indirect vector controlled stand-alone three-phase induction generator (IG) used to operate under variable speeds. The required reactive power for the three-phase IG system is supplied by means of a capacitor bank and a voltage-source PWM converter. Using a capacitor bank to transfer the reactive power...
Compared with DC traction application, AC electric traction is known to provide robust and low cost solution with high dynamic performances for an industrial vehicle. This embedded, compact and autonomous system is composed of a low voltage and high current induction motor (IM) fed by PWM voltage source inverter (PWM-VSI) supplied by an independent DC source (DCS battery). The authors propose the...
This paper presents a new adaptive rotor flux observer for speed sensorless induction motor (IM) drives which provides the rotor speed, stator and rotor resistances estimations simultaneously. The rotor speed and rotor flux controllers are designed based on combination of input-output feedback linearizing, sliding-mode (SM) control and linear quadratic (LQ) feedback control. It is shown that the composite...
In this paper, the torque ripples in low speed range of conventional direct torque control are analysed, and the strategy of predictive control of torque and/or stator flux is presented. A new vector selection table based on area voltage is proposed to control the torque and flux. In this case, two predictive control schemes are presented to reduce torque ripples and improve the steady and dynamic...
This paper presents a new complete artificial neural network (ANN) of direct-torque control (DTC) for the system matrix converter (MC)- induction motor (IM) to decrease the time of calculation of the conventional control system. To avoid the difficult calculation of DTC, the design uses the individual training strategy with the fixed weight and the supervised models. A computer simulation program...
The technique of decomposition of space vectors in the four-switch voltage source inverter fed three-phase induction motor is presented in this paper. The analytical results of the machine are accomplished in alphabeta complex plane by space vector decomposition and by using mixed p-z approach. Two possible modes of six step operation, utilizing in different ways only four voltage vectors are investigated...
This paper explores the possibility of applying natural commutation technique to center-tapped HF link inverter. Natural commutation technique has been applied to bridge-type HF link inverter to solve the problems of switching loss and voltage surge across transformer secondary. The condition of natural commutation mechanism in HF link inverter is investigated to enable the design of modified switching...
This paper presents a comparative study between an improved full-bridge (FB) zero-voltage and zero-current switching (ZVZCS) phase-shifted pulsewidth modulation (PS-PWM) DC-DC converter and an improved three-level (TL) ZVZCS PS-PWM DC-DC converter. Both converters operate at fixed frequency and achieve zero-voltage-switching on the leading leg of FB or outer switches of TL, and also achieve zero-current-switching...
This paper presents a cost effective edge-resonant soft-switching PWM high frequency inverter with minimum circuit components. This inverter can achieve wider soft commutation, simpler circuit configuration, smaller volumetric size, lower cost and wider power regulation range, higher-efficiency as compared to single ended quasi-resonant ZVS-PFM and active voltage clamped quasi-resonant ZVS-PWM inverters...
A new fully soft-switched boost-converter is proposed here, using only one auxiliary switch. All switches used in this converter turn on and turn off under fully soft-switched condition. The diodes also commutate softly. The converter uses minimum number of components in the auxiliary circuit without additional current stress of the main switch. The circuit conduction losses are also minimised, since...
This paper presents a new circuit topology of DC bus line switch-assisted half-bridge soft switching PWM inverter type DC-DC converter for arc welder. The proposed power converter is composed of typical voltage source half-bridge high frequency PWM inverter with a high frequency transformer link in addition to DC bus line side power semiconductor switching devices for PWM control scheme and capacitive...
In this paper, we propose a modeling based scheme to study the practical characteristics of buck zero-voltage switching quasi-resonant converters (buck ZVS-QRC's). Instead of assuming the unity power efficiency and/or having the ideal characteristics of all the circuit components in the most existing studies, a novel model taking the equivalent intrinsic resistance of each circuit component and the...
This paper presents a novel circuit topology of isolated DC-DC power converter, which includes stable and efficient zero voltage soft switching (ZVS) full bridge inverter in the high frequency planner transformer primary-side and zero current soft switching rectifier in its secondary side. This power converter incorporates zero current soft switching (ZCS) phase-shifted PWM controlled two active power...
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