Showing papers by "Nursyarizal Mohd Nor published in 2015"
01 Oct 2015
TL;DR: In this article, the authors reviewed different energy storage systems (ESS) and their sizing techniques, used in power system and recommended that current energy models used for sizing of energy storage should be reconsidered and re-designed.
Abstract: The increasing penetration of renewable energy sources in electrical grids mandates to utilize some energy storage to overcome the variations of intermittent power outputs. The energy storage technologies can help in balancing the generation and demand by storing unused electricity and then supplying it back to grid when required. In future grids, energy storage technologies are expected to become a major source of electricity; a collaborator to those distributed generations (DG) resources. The objective of this research was to review different energy storage systems (ESS) and their sizing techniques, used in power system. Study focused on Mechanical Energy Storage (MES), Electric and Magnetic Energy Storage (EMES) and Electro-Chemical Energy Storage (ECES) systems. Through this review, it is known that most of the research regarding energy storage sizing for large PV plants follow similar techniques as used for standalone PV systems. Additionally some authors have proposed energy models which considered only daily or yearly energy demand without considering certain network constraints. Estimating energy storage capacity without considering the electrical networks constraints may pose a threat to future energy balance predictions leading to a huge loss of investment due to unplanned storage sizing. Therefore it is recommended that current energy models used for sizing of energy storage should be reconsidered and re-designed.
38 citations
TL;DR: In this paper, the authors presented the design validation and optimization of a moving-magnet tubular linear permanent magnet motor (TLPMM) with a trapezoidal permanent magnets shape.
Abstract: 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 %.
3 citations
TL;DR: In this article, the authors proposed a portable linear permanent magnet generator for the wave energy conversion system that suits with the local wave parameters. But the generator is not suitable for the use in the underwater environment due to its low maintenance cost.
Abstract: Malaysia is a small country surrounded by numerous oceans that can provide sufficient renewable energy for utilization. This work is to propose a design and modeling of a portable linear permanent magnet generator for the Wave Energy Conversion system that suits with the local wave parameters. Linear generator is preferable as compared to the rotary generator due to the direct drive technology that promises low maintenance cost. Three linear permanent magnet generator designs with different types of permanent magnet layout have been proposed as the permanent magnet used can provide better flux density compared to other topologies. Preliminary results for the air gap flux distribution and open-circuit flux distribution are demonstrated and discussed are shown to be as expected.
2 citations
TL;DR: In this article, a design methodology for a single-phase, tubular, linear permanent magnet generator which drives linear motion of wave energy for Wave Energy Conversion (WEC) system application is presented.
Abstract: This paper illustrates a design methodology to accomplish optimum performance for a single-phase, tubular, linear permanent magnet generator which drives linear motion of wave energy for Wave Energy Conversion (WEC) system application. It is shown that the linear generator performance can be optimized with respect to three leading dimension ratios. Existence of copper loss in the linear generator also can be reduced by performing the optimization process. Results for the linear generator efficiency, copper loss and output power are demonstrated and discussed are shown to be as expected.
1 citations
TL;DR: In this paper, the influence of leading design parameters on the performance of a novel T-shaped permanent magnet (PM), quasi-Halbach magnetized tubular linear motor was deduced from finite element analysis (FEA).
Abstract: 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.