Journal•ISSN: 2172-038X
Renewable energy & power quality journal
Elsevier BV
About: Renewable energy & power quality journal is an academic journal published by Elsevier BV. The journal publishes majorly in the area(s): Renewable energy & Photovoltaic system. It has an ISSN identifier of 2172-038X. Over the lifetime, 2881 publications have been published receiving 11692 citations. The journal is also known as: RES & renewable energy source.
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TL;DR: The preliminary results indicate that the recovered energy is not sufficient to directly power devices but could be stored in a super-capacity or micro-batteries.
Abstract: In this paper, we present a study of ambient RF energy harvesting techniques. The measurement of the ambient RF power density is presented. The average of the density in broadband (1GHz3.5GHz) is in the order of -12dBm/m2 (63μW/m2). Two systems have been studied to recover the RF energy. The first is a broadband system without matching circuit. The second is a narrow band system (1.8-1.9GHz) with a matching circuit. The rectifier circuit RF / DC and the choice of the load to optimize the DC power recovered are presented. The preliminary results indicate that the recovered energy is not sufficient to directly power devices but could be stored in a super-capacity or micro-batteries.
150 citations
TL;DR: In this paper, a technical review of power quality problems associated with the renewable based distributed generation systems and how custom power devices (CPD) such as STATCOM, DVR and UPQC play an important role in power quality improvement is presented.
Abstract: This paper presents a technical review of power quality problems associated with the renewable based distributed generation systems and how custom power devices (CPD) such as STATCOM, DVR and UPQC play an important role in power quality improvement. IEEE and IEC standards for grid connected renewable energy systems are one of the critical points of interest for the selection of custom power devices. PV and wind energy systems integration issues and associated PQ problems are discussed. The role of CPDs in enhancing the integration of renewables and providing quality power through custom power park are described.
148 citations
TL;DR: The paper shows an approved concept that combines inverter technology and synchronous machine properties that guarantees the stable highly parallel grid operation, automatic power balancing and damping.
Abstract: Up to now, the electromechanical synchronous machine rules the domain of electrical power generation devices and that way the public power grids. Its specific characteristics guarantee the stable highly parallel grid operation, automatic power balancing and damping. Not least the rotating mass is related to some dynamic properties and the condition for the grid short time frequency stability. The progressive integration of renewable sources is accompanied by questions concerning the loss of these features using inverters for grid feeding. The paper shows an approved concept that combines inverter technology and synchronous machine properties.
131 citations
TL;DR: A new method is developed to implement the VISMA by using a current-to-voltage model on the currently widely applied PWM controlled inverter, called VISMA-Method 2 in this paper and will be compared with the VISma-Method 1 by simulation results.
Abstract: Virtual Synchronous Machine also called VISMA [1] is a control algorithm to make an inverter operated as a conventional electromechanical synchronous machine. It is a promising solution to overcome the problems of the grid stability and quality, which have been exacerbated by increasing integration of distributed generation units into the grid. Compared to the conventional power plants, in which the synchronous machine dominate, the distributed generation units have either significantly smaller or no rotating mass and damping effect. These weaknesses can be compensated by using the VISMA concept and thus the power system quality will be improved. Furthermore, the penetration level of the DG sources won’t be restricted any more. Up to now the VISMA was implemented by using a voltage-tocurrent model on a hysteresis controlled inverter [1][2][3]. This method will be called VISMA-Method 1 here. Since the most products of inverters in the market are PWM controlled, the VISMA-Method 1 cannot be easily applied on these inverters. Therefore, a new method is developed to implement the VISMA by using a current-to-voltage model on the currently widely applied PWM controlled inverter. This new method is called VISMA-Method 2 in this paper and will be compared with the VISMA-Method 1 by simulation results.
131 citations
TL;DR: In this paper, the effect of voltage sags in industrial systems on adjustable speed drives is investigated. But the authors focus on the effects of sags on the power system protections and in order to improve the susceptibility of the adjustable speed drive under sags.
Abstract: This paper presents results relating to the effect of voltage sags in industrial systems on adjustable speed drives. The influence of the source impedance, dc link capacitor, characteristics of voltage sags and the effect of the utility is computed. The results from the analysis can be used during the design task of the power system protections and in order to improve the susceptibility of the adjustable speed drives (ASD ́s) under sags. Simulation and experimental results are provided.
106 citations