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Today's three-phase Adjustable Speed Drive (ASD) systems still employ Diode Rectifiers (DRs) and Silicon-Controlled Rectifiers (SCRs) as the front-end converters due to structural and control simplicity, small volume, low cost, and high reliability. However, the uncontrollable DRs and phase-controllable SCRs bring side-effects by injecting high harmonics to the grid, which will degrade the system...
Customers may have different power quality requirements, thus, the economic operational strategy can try to provide them with distinctive quality levels as customized service. An optimization based method is proposed in this paper to realize this functionality, offering the possibility that the customers can flexibly set and adjust their requirements. Converter interfaced distributed generators are...
The objective of this project is the performance optimization of an electrical drive system, which consists of a two-level Voltage Source Inverter (VSI) and a Permanent Magnet Synchronous Motor (PMSM) with high magnetic anisotropy. To this end, the concept of Synchronous Optimal Modulation (SOPWM) is employed for inverter control and the optimal inverter switching angles are defined for an isotropic...
This paper presents an optimization approach based differential search algorithm (DSA) for amplitude and phase estimation of time varying power signal in electrical power systems. Proposed method has been tested for two well-known literature problems that include fundamental, sub- and inter-harmonic estimation cases. The performance of the suggested DSA method has been compared with those of the Genetic...
This paper focuses on the computation time and precision of a linear 2-D magnetic gear analytical model. Two main models of magnetic gears are studied: 1) the first with an infinite relative permeability of yokes and 2) the second with a finite relative permeability of yokes. These models are based on the subdomain resolution of Laplace and Poisson equations. To accurately compute the magnetic field...
The harmonic problem is as a consequence of nonlinear power electronic devices in powering industrial distribution systems. A filter is a necessary equipment in the power system to reduce or eliminate harmonics.In this paper, the optimal design of filters to reduce total harmonic distortion (THD) has been investigated using the Matlab/Simulink. Bee Colony Optimization (BCO) is applied as optimization...
This paper presents a model predictive strategy to generate optimal reference signals for single-phase inverters. The reference signal is obtained from an optimisation problem, which can hold multiple objectives and constraints over a defined time horizon. Specifically, the proposed strategy is designed to trade off harmonic distortion for instantaneous DC bus voltage ripple regulation without exceeding...
Transverse flux machines can be a torque dense solution for applications requiring a relatively low speed such as electrically assisted bicycles or scooters. Common drawbacks include a high torque ripple caused by a high cogging torque and high back electromotive force harmonics. Cogging torque is of particular importance as it can be felt even when the system is disengaged and the bicycle is being...
As an almost standardized configuration, Diode Rectifiers (DRs) and Silicon-Controlled Rectifiers (SCRs) are commonly employed as the front-end topology in three-phase Adjustable Speed Drive (ASD) systems. Features of this ASD configuration include: structural and control simplicity, small volume, low cost, and high reliability during operation. Yet, DRs and SCRs bring harmonic distortions in the...
In large wind farms, the mutual interactions between the power converter control systems and passive components may result in harmonic instability and resonance frequencies at a various frequency range. This paper presents an optimized parameter design of the power converter controllers in large wind farms in order to reduce the resonance probability and guarantee harmonic stability. In fact, a general...
Today non-linear loads are inevitably used in industrial, commercial and domestic facilities have risen to harmonic problems. Harmonics affect the loads connected at Point of Common Coupling (PCC). Shunt Active power Filter (SAPF) is implemented for harmonics elimination in the distribution system. The SAPF performance depends upon the controller adopted for SAPF. Recently by the inspiration of the...
In this paper, an effective closed loop reference current extraction topology for single phase active power filter applications, is proposed. The main idea of the proposed topology is based on the Adaptive Transversal Filter (ATF) principle. The adaptive filter is designed and optimized using genetic algorithm (GA). The proposed methodology is simulated and tested in MatLab software. The results indicate...
Passive shunt harmonic filters are a convenient means of power quality preservation as well as effective reactive power compensators. The problem formulation for the optimization of passive filters has been addressed using various approaches as a single-objective or a multi-objective optimization problem. The present paper considers a new multi-objective formulation for the multiple passive filters...
The increase in the number of power electronic applications has led to harmonic pollution of the power grid. Harmonic resonance that can result in severe voltage distortion is a well documented problem. Several suppression techniques have been proposed to solve this problem. This paper proposes a technique to cooperatively operate multiple Active Power Line Conditioner (APLC) installed in the same...
An optimization problem of calculating optimal parameters of the third-order passive filter for centralized reduction of harmonic voltages in a radial network with distributed nonlinear loads is formulated. In order to solve the problem a two-stage algorithm is developed on the basis of particle swarm optimization and interior point techniques. The application of the suggested algorithm is exemplified...
In the present work Selective Harmonic Elimination Pulse Width Modulation (SHE-PWM) based on Particle Swarm Optimization is proposed for the enhancement of the H-Bridge multilevel inverter output voltage quality. The problem of the SHE-PWM is presented by a constrained nonlinear objective function which has to be minimized. The main aim is the calculation of the switching angles vector solution representing...
Distributed generations (DGs) play an important role in distribution networks. Among many of their merits, loss and THD reduction and voltage profile improvement can be the salient specifications of DG. Studies show that non-optimal locations and non-optimal sizes of DG units may lead to losses increase, together with bad effect on voltage profile and harmonics. So, this paper aims at determining...
In this paper a new method for magnetic circuit design using the knowledge of corresponding harmonics in the magnetic field and the cogging torque is presented. At the beginning, different approaches to reduce cogging torque for machines with embedded permanent magnets which were presented in the last years are investigated and compared qualitatively. Afterwards, the new developed method is introduced...
Due to the presence of large number of reactive power compensators at different voltage levels in a typical industrial network, many combinations of the settings of compensators are possible, all of which are not appropriate in terms of harmonic conditions in the network. Thus, it is rather hard for an operator to make an optimal decision how to operate and predict all of the potentially dangerous...
In this paper optimal control strategies for active power filters working under non-sinusoidal voltage are approached using Pareto Optimal based multi-objective optimization. Where the voltages are distorted, there is some conflict between power factor improvement, current harmonics mitigation, and cost issues. The Strength Pareto multi objective optimization approach is used to simultaneously optimize...
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