Browsing by Subject "Electric power transmission"
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Item Optimizing reactive power flow of HVDC systems using genetic algorithm(2014) Kiliç U.; Ayan K.; Arifoǧlu U.Due to the usage of high voltage direct current (HVDC) transmission links extensively in recent years, it requires more studies in this issue. Two-terminal HVDC transmission link is one of most important elements in electrical power systems. Generally, the representation of HVDC link is simplified for optimal reactive power flow (ORPF) studies in power systems. ORPF problem of purely AC power systems is defined as minimization of power loss under equality and inequality constraints. Hence, ORPF problem of integrated AC-DC power systems is extended to incorporate HVDC links taking into consideration power transfer control characteristics. In this paper, this problem is solved by genetic algorithm (GA) that is an evolutionary-based heuristic algorithm for the first time. The proposed method is tested on the modified IEEE 14-bus test system, the modified IEEE 30-bus test system, and the modified New England 39-bus test system. The validity, the efficiency, and effectiveness of the proposed method are shown by comparing the obtained results with that reported in literature. Thus, the impact of DC transmission links on the whole power systems is shown. © 2013 Elsevier Ltd. All rights reserved.Item Artificial bee colony algorithm based optimal reactive power flow of two-terminal HVDC systems(Turkiye Klinikleri Journal of Medical Sciences, 2016) Kiliç U.; Ayan K.This paper presents a solution technique for the optimal reactive power flow (ORPF) of alternating current- direct current (AC-DC) power systems using the artificial bee colony (ABC) algorithm. A high voltage direct current (HVDC) transmission link is one of the most important network components in AC-DC power systems. In recent years there has been an increasing number of studies related to power systems with HVDC transmission links. One of them is the reactive power flow (RPF) optimization. The aim of ORPF in alternating current (AC) or AC-DC power systems is to minimize transmission line power loss under equality and inequality constraints. The relationships related to the HVDC link are incorporated into AC power system equations considering its power transfer characteristics. This paper contributes to the solution of the problem by using the ABC algorithm for the first time. The proposed method is examined on three test systems and its effectiveness in these kinds of applications is shown by the comparative results. © TÜBİTAK.Item Power infrastructure quality and industrial performance: A panel data analysis on OECD manufacturing sectors(Elsevier Ltd, 2022) Acar P.; Berk I.This paper investigates the effects of power infrastructure quality on the performance of the manufacturing industries in 27 OECD countries over the period from 1995 to 2014. The panel Autoregressive Distributive Lag Approach (ARDL) is employed on annual data of the manufacturing production, of value-added as proxy variables for manufacturing performance, and of electricity power transmission and distribution losses as a proxy for power infrastructure quality. Due to the existence of cross-sectional dependence, second-generation estimators, namely the Common Correlated Effects Mean Group (CCEMG) and the Augmented Mean Group (AMG), are used. The results indicate that the transmission and distribution losses negatively affect both manufacturing production and value-added. The negative effect remains robust even when different sets of control variables are added. Estimations reveal that these losses have a more profound and significant effect on manufacturing production than they do on the value-added. We also found the negative effect to be higher and more significant for the EU-13 subgroup, which explains the particular interest in the issue shown in the recent EU energy efficiency directives. © 2021 Elsevier Ltd