1,720,958 research outputs found
Kaedah megawatt mile menggunakan pendekatan berasaskan faktor kuasa untuk caj perkhidmatan penghantaran
Get PDFDeregulation of the electricity energy market has changed many aspects of utility industry, including transmission pricing. The main problem in transmission pricing is the determination of transmission cost according to actual power flow and the load power factor. In fact, poor power factor will cause a decrease in electrical power delivery capability. Therefore, it needs an accurate method to determine the transmission cost according to the actual power flow ang load characteristic that can satisfy costumer of transmission line. This thesis proposes a novel method through an improved Megawatt Mile (MW-Mile) method using the power factor-based approach for pricing the transmission services. In the proposed method, the power factor correction coefficient is introduced as a price parameter to determine the additional or reduction of transmission cost due to the difference between the average load power factor and the reference power factor set by a regulator. This method is incorporated with the distribution factor method to trace the power flow in the network. The proposed method as tested on the IEEE-14 bus system and the IEEE 30-bus system to illustrate the effectiveness of the proposed method in allocating the transmission pricing to a user in a fair manner. The results have indicated that there were differences in the cost of transmission utilization which in reality, depends on the power factor of the load. For power factor reference is 0.9, the user with an average power factor of 0.85 will be charged at 5.88% higher, while the user with power factor of 0.95, the payment will be decrease by 5.2% as compared to the existing methods. The advantage of the proposed method lies in the incentive given to the users due to power factor improvement. This method is also able to solve the problem of the reactive power charges and the transmission loss share for the users
PENINGKATAN EFISIENSI BAHAN BAKAR PADA PEMBANGKIT TENAGA DIESEL (PLTD) MELALUI PERBAIKAN FAKTOR DAYA BEBAN: (Alternatif baru pengurangan emisi CO2)
Get PDFThe contribution of the thermal power plant for CO2 emissions was a crucial problem of global warming all over theworld. Therefore, the emission reduction commitments continued to effort through treatments and technology to improvethe efficiency of power plant including the diesel power plant. This paper proposes the power factor improvement toreduce the emission of the diesel power plant output. This Proposal has shown a relationship between the power factorimprovement and the reduction of CO2 emissions from a diesel engine. From the results obtained by using the IEEE 30-bus test system (modified) proved that there was a emissions reduction significantly especially on the rate of the powerfactor with power factor > 0.97 (lagging)
PENENTUAN BIAYA SALURAN TRANSMISI MENGGUNAKAN METODE MW-MILE BERDASARKAN KUALITAS DAYA
No full textIssu utama dalam tarif daya listrik adalah penentuan pemanfaatan saluran transmisi yang sesuai dengan aliran daya yang sebenranya. Formulasi metode yang tepat dalam menentukan tarif listrik berdasarkan aliran daya yang sesuai dengan karakteristik beban sangat diperlukan. Salah satu metode yang banyak digunakan dalam biaya transmisi adalah metode MW-Mile. Namun, metode ini belum pernah diterapkan dalam penentuan tarif listrik serta metode ini pula belum mencerminkan karakteristik sesungguhya dari pelanggan (industri atau bisnis). Oleh karena itu, dalam penelitian ini akan diusulkan sebuah formulasi tarif listrik dengan memodifikasi metode MW-Mile dengan mempertimbangkan karaktersitik sesungguhnya pelanggan listrik terutama pelanggan industri dan bisnis.Kata kunci : Deregulasi sistim tenaga, kualitas daya, saluran transmis
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Impact of micro hydro power plants on transient stability for the micro grid 20 kV system
Get PDFTransient stability analysis is conducted to determine the ability of the electric power system in maintaining the operating stability after a major disturbance. The disturbance can be trigger an impact on the stability of the rotor angle, voltage, and system frequency which can cause loss of synchronization. In this paper, the impact of the interconnection of the Tombolo-Pao mini hydro power plant (MHPP) on the stability of the system was analyzed by several scenarios to determine the behavior of system parameters in a 20 kV system interconnection network. This research is an implementation of regulatory provisions relating to the study of the connection to the PLN distribution network through by regulator. Based on the result of simulation study, transient stability of generators at TomboloPao power plant about 0.1 second, will not occur with network configuration according to modeling activation of anti-islanding protection of Tombolo Pao Power Plant which is set by 2 second. The simulation results show that the location of the disturbance in the electric power system has been influenced by the behavior of the power plant (synchronous generator) which can lead to the instability of the micro-hydro connected to the micro-grid system 20 kV
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