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In this paper, a novel sensorless boost-type DC/AC motor drive is proposed. Based on a generalized zero vector technique, the proposed drive has several advantages such as higher output voltage to increase motor efficiency, reduced weight and space of the battery etc. The magnitude, phase and frequency of air-gap flux can be obtained by adopting 120?? control strategy for motor coil. Therefore, using...
In this paper, a half-bridge single-stage power converter is used as a fundamental study object. The half-bridge single-stage power converter proposed in this thesis has inherent gift of high power factor correction (PFC) even when the PFC inductor operates in discontinuous conduction mode (DCM). It is revealed that if the proposed converter is operating in DCM, it not only inherently has high power...
A new fast hybrid control approach of the pq control theory applied to the 3 phase 4 wire active power filter is proposed. The mathematical model developed is based on the direct power control theory using the pq theory. This technique inherits not only the simplicity of the conventional direct power control but also offers a good dynamic response in active filtering. The analysis is verified using...
This paper presents and analyses a new dynamic adaptive space vector PWM algorithm for four-switch three-phase inverters (FSTPI) fed induction motor under DC-link voltage ripple. By using reasonable mathematical transform, Space Vector PWM technique for FSTPI under DC-link voltage imbalance or ripples has been proposed, which is based on the establishment of basic space vectors and modulation technique...
A direct power control (DPC) scheme for three-phase PWM rectifier based on sliding-mode variable structure control theory is presented. Compared with the traditional PI controller, the proposed scheme is much more robust with better transient performance, lower total harmonic distortion (THD) and simpler tuning of parameters. Modeling and simulation done in MATLAB/SIMULINK environment shows that the...
It is well known that transition current mode control for power factor corrector can reduce the reversal recovery loss for the diode. This method can be realized using discrete control integrated circuit which requires zero-crossing detection circuit. In this paper, a novel control technique for digital-controlled power factor corrector to achieve transition current mode control is proposed. The switching...
This paper presents a unique implementation of the recursive Gauss-Newton, (GN), algorithm operated by maximum likelihood estimation for tracking and extracting the common current quality problems such as current harmonics. Moreover, this paper proves that the utilization of the ramp-comparison current controller, (the linear current controller), for the operation of the shunt power conditioner is...
This paper proposes a universal large-capacity capacitor simulator consisting of a chemical capacitor and three-leg converter. One of three legs performs a bi-directional dc-to-dc converter. The others are used for a single-phase PWM rectifier. In the charging operation of the proposed large-capacity simulator, one-leg is used as a boost converter. Most power, which is stored in the proposed simulator,...
In this paper, the advantages/disadvantages of several commonly used maximum power point tracking algorithm (Perturb & Observe, Incremental Conductance, Three Points Weighting, and Improved Perturb & Observe) are firstly discussed. Then, a Modified Perturb & Observe (MPO) method is proposed to achieve maximum power point tracking (MPPT) for a PV (photovoltaic) system and to improve the...
A systematic analysis for the multi-phase voltage source inverter (VSI) is illustrated in this paper. By applying the singular value decomposition, the instantaneous output voltage of VSI can be categorized into two complementary groups with the same magnitude and different sign to each other. The switching strategy for minimum conduction time which yields the maximum linear modulation index is proposed...
When a low voltage DC power source is used, a DC-DC converter with a high step-up voltage gain is required to raise the voltage to more applicable levels. This is typically achieved in classical converters which often have to be driven by pulse width modulation (PWM) waves with extremely high duty cycles. Although theoretically step-up converters can achieve an infinite gain as the duty cycle approaches...
This article is concerned about the analysis, design, and simulation of an electric power steering (EPS). The article begins by introducing the EPS system concept and comparing the technical and commercial benefits with existing technologies. Being more versatile than conventional hydraulic power steering, EPS systems excel in engine efficiency, space saving, and environmental friendly. The remainder...
This work presents a new artificial neural network (ANN) Controller for implementing the Direct control method (DCM) for Matrix converters (MC) to decrease the time of calculation of the conventional DSP control system. To avoid the difficult calculation of ANN-DCM, the design uses the individual training strategy with the fixed weight and the supervised models. A computer simulation program is developed...
This paper presents a method using motor vibration signal spectrums and applying the extension method for discriminating different types of motor rotor malfunctions. Firstly, this paper establishes an extension model for motor rotor malfunction types and spectrum characteristics based on the test data of motor rotor malfunctions, employing it as a basis for extension theory and using extension engineering...
The auxiliary converter (AXC) has been presented as a cost-effective solution to retrofit the conventional diode rectifier into a unity-power-factor and regeneration-enabled front-end. However, the pulse width modulation (PWM) switching of the AXC often causes circulating current between the AXC and diode rectifier. The zero vectors of each PWM cycle induce zero sequence current, which results in...
Digital controller platforms for power electronic converters have typically been based on a single high performance digital processor, often coupled with a programmable logic gate array. The digital processor is usually a digital signal processor (DSP). Often, a highly optimized real-time operating system provides multitasking features for the controller code execution on a single processor core....
A methodology, utilizing loop gain of circuitry to extract the main features for providing the useful indexes being able to come out the evaluation of light-load operation efficiency for power supply design, is proposed herein. A DC-to-DC converter scheme for adaptor application is adopted for demonstrating the relation between switching device conduction duty cycle ratio, loop gain, and efficiency...
This paper investigates the potential savings using improved motor and power electronic technology and improved motor control, for different heating ventilation and air-conditioning load profiles. Different energy labels (eff1-eff3) and different voltage/frequency (V/Hz) control have been investigated. The general conclusion is that economical savings will be made, both for an induction motor (IM)...
This paper presents a coupled-buck converter with active-clamp circuits. The active switches in the converter can sustain a long enough duty cycle while it operates with a high step-down voltage ratio, reducing current stress significantly. In the converter, the active-clamp circuits provided can have benefits of recycling the leakage energy, while minimum ringing voltage is across the active switches...
We explore the passivity-based control (PBC) for robust UPFC controller design. Under this framework, the dynamical model of UPFC will be represented by a Euler-Lagrangian (EL) system with a set of EL parameters. The energy-dissipative properties of system model are fully retained. The proposed nonlinear UPFC controller consists of two feedback loops. In the inner loop, the so-called passivity controller...
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