Izzeldin Idris Abdalla

Three-phase four-leg shunt active power filter to compensate harmonics and reactive power

This paper presents a compensating system for the harmonics and the reactive power using four-leg shunt active power filter (SAPF) in a three-phase four-wire distribution network and aims to minimize the harmonics and neutral current. Two control approaches p-q theory based hysteresis current control and load current detection based hysteresis current control are proposed. To validate the compensation performance of SAPF a distribution network with nonlinear loads is simulated using MATLAB/Simulink software. Simulation results are presented to assess the performance of SAPF to minimize the total harmonics distortion (THD) and neutral current, as well as to compensate the reactive power.

Harmonics mitigation and power factor correction with a modern three-phase four-leg shunt active power filter

In this paper a compensating system using four-leg shunt active power filter (SAPF) in a three-phase four-wire distribution network which will be able to mitigate harmonics, absorb or generate reactive power, and improve the power factor on supply side, is presented. Two control approaches based on p-q theory and load current detection using phase locked loop (PLL) are proposed. To validate the compensation performance of SAPF the distribution network with nonlinear loads is simulated using MATLAB/Simulink software. Simulation results have proved and validated the performance of SAPF minimizing the total harmonics distortion (THD) and neutral current.

A comparative study of Shunt Active Power Filter performance in distribution systems

This paper aims to present a comparative simulation study of Shunt Active Power Filter (SAPF) compensation performance on a three-phase three-wire distribution system supplying a nonlinear load. The SAPF model is developed to generate compensating reference currents by instantaneous reactive power theory based hysteresis current controller. The simulation of the distribution system supplying a three-phase nonlinear load based on MATLAB/SIMULINK and PSCAD/ EMTDC software show the effect on compensating reactive power and harmonic components of the source current. Simulation results show that, MATLAB outperformed over PSCAD to accurately implement and validate the model providing more degrees of freedom and relatively better settings in real time.

Analysis of a Tubular Linear Permanent Magnet Motor for Reciprocating Compressor Applications

This paper describes a design optimization to achieve optimal performance of a two novel single-phase short-stroke tubular linear permanent magnet motors (TLPMMs) with rectangular and trapezoidal permanent magnets (PMs) structures. The motors equipped with a quasi-Halbach magnetized moving-magnet armature and slotted stator with a single-slot carrying a single coil. The motors have been developed for reciprocating compressor applications such as household refrigerators. It is observed that the TLPMM efficiency can be optimized with respect to the leading design parameters (dimensional ratios). Furthermore, the influence of mover back iron is investigated and the loss of the motor is computed. Finite element analysis (FEA) is employed for the optimization, and the optimal values of the ratio of the axial length of the radially magnetized magnets to the pole pitch as well as the ratio of the PMs outer radius-to-stator outer radius (split ratio), are identified.

Design Validation of a Moving-Magnet Tubular Linear Permanent Magnet Motor with a Trapezoidal Permanent Magnet Shape

This paper presents the design validation and optimization of a moving-magnet tubular linear permanent magnet motor (TLPMM) with a trapezoidal permanent magnets shape. The design optimization was implemented by two-dimensional Finite-Element Analysis (2-D FEA) and the validation has been established by using Matlab M-file. The proposed motor has been designed to produce 85 W output power which is enough to operate the linear reciprocating compressor of a household refrigerator system. The purpose of optimization is to achieve maximum efficiency and minimum losses, where the angle of PMs (β) and split-ratio (Rm/Re) after optimization the motor produce the highest efficiency of 93.8 %.

The Fabrication and Characterization of Short-Stroke Tubular Linear Permanent-Magnet Motor

This paper describes the characterization and fabrication of tubular linear permanent-magnet motor (TLPMM). The motor is single-phase moving-magnet with a quasi-Halbach magnetization patterns. The soft magnetic composite (SMC) material, Somaloy 700, has been used for the fabricated stator core of the TLPMM and a single ring coil has been placed in this stator. Meanwhile, the translator consists of permanent-magnet (PM) rings, Neodymium Iron Boron (NdFeB) rode on a supporting tube made of ferromagnetic material. This kind of motor has a simple structure, high force capability, and high efficiency. Therefore, the proposed motor with these characteristics is possible to drive the piston in a reciprocating compressor of the refrigerator applications with more energy saving. Based on the simulation results from the Finite-Element Analysis (FEA), it is possible to fabricate a TLPMM with efficiency more than 94 %. Moreover, it is shown that the proposed motor has a capability to operate the reciprocating compressor in the refrigeration applications.

Influence of Leading Design Parameters on the Performance of a T-Shaped Permanent Magnet Tubular Linear Motor

This paper deduces from Finite-Element Analysis (FEA), the influence of leading design parameters on the performance of a novel T-shaped permanent magnet (PM), quasi-Halbach magnetized tubular linear motor. The proposed motor is designed and developed for small reciprocating applications. In order to obtain the maximum power density, a two-dimensional Finite-Element model is developed to investigate the performance of the proposed machine. The proposed T-shaped PM structure has a higher power density as compared to the conventional rectangular-shaped PM structure. The losses of the motor, such as copper loss and iron loss, as well as the efficiency, are established as functions of a set of motor leading design parameters. It is shown that the developed motor produce satisfactory output power, around 85 W, which is enough to operate the direct-drive reciprocating compressor of a household refrigerator.