May 2020 / by
The incomplete information of the future prospects of new renewable energy power generation technology, which is contained in external random events regarding policy, technology and market, together with the technical uncertainty of R&D success will affect the investment decision of renewable electric power enterprises. The critical beliefs, which are necessary for single enterprise and duopoly renewable energy power enterprises for their investment in new power generation technologies, are obtained respectively by taking into consideration the incomplete information, technical uncertainty and competitiveness and construction of decisionmaking model based on real options, and the equilibrium type that may generate in market competition of the two symmetric enterprises and the generation conditions are further analyzed in this paper. The result indicated that the winner take- all privilege granted to the leading innovator and the technical uncertainty to innovative technology by policy will make the following enterprises react in two ways, investment delay or investment advancing. The faster signal arrives, the higher the signal quality is and the higher is the investment belief of the following investor. Moreover, the R&D competition equilibrium among enterprises can result in preemptive equilibrium and simultaneous investment equilibrium.
Keywords: Incomplete information, renewable energy power, R&D, option game, game equilibrium.
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May 2020 / by
In the deregulated regime electricity market is oligopolistically competitive. It is one of the challenging tasks for the power system engineers to maintain security of the power system. The security will be maintained if the system becomes able to operate within system constraints, like limits of bus voltage magnitudes, current and power flow over the lines etc, to name a few, in the event of outage, i.e. contingency, of any component like generator or transmission line. The goal of the contingency analysis is to give the operator about the static security information. Contingency analysis of a power system is a major activity in power system planning and operation. In the present work, the authors have considered a hypothetical 10-Bus system and studied the contingency analysis of the system based on one by one outage of generators and lines using Power World simulator. The results of major violations are shown in the paper. The linear sensitivity factors are the faster techniques to estimate the post contingency values of different quantities of interest. In the present work one sensitivity factor like line outage distribution factor (LODF) has been estimated. Optimal power flow at major violation has been performed to identify the effective system adjustment.
Keywords:Contingency analysis, power world simulator, LODF.
1. Wood A.J, Wollenberg B.F. (1996): Power generation, operation and control. John Wiley & Sons Inc. 2. Kothari D.P., Nagrath I.J. (2011): Modern power system analysis.TMH Publication. 3. Mishra V.J., Khardenvis M. D. (2012): Contingency analysis of power system. In: International Conference on Emerging Frontiers in Technology for Rural Area (EFITRA), pp-31-34. 4. Aliyan E., et al, (2020): Decision tree analysis to identify harmful contingencies and estimate blackout indices for predicting system vulnerability. Electric Power Systems Research 178. 5. Basu A. K., Chowdhury S., Chowdhury S. P., Paul S. (2011): Microgrids: Energy management by strategic deployment of DERs – A comprehensive survey. Renewable and Sustainable Energy Reviews, 15, pp. 4348-4356. 6. Contingency analysis – PowerWorld. available at: https://www.powerworld.com 7. Zhai C., et al, (2019): A model predictive approach to protect power systems against cascading blackouts. Electrical Power and Energy Systems 113, 310–321.
May 2020 / by
In the present study channel confluence movements of two confluence points namely, Chel-Kumlai rivers’ confluence and Chel-Neora rivers’ confluence in the lower Chel-Neora river system has been analyzed using multi temporal Landsat images and topographical sheets. The study area is a part of region popularly known as ‘Dooars’ which falls in the zone of transition between the dissected outer Himalayan hill surface and the gently rolling Teesta-Brahmaputra plains, and is famous for notorious incidents of channel avulsion and river capture activities. This study tries to elucidate various fluvial processes responsible for confluence dynamics. The temporal scale of the study spans 62 years (1955-2017) and establishes the fact that the confluence points of the rivers have shifted both upstream and downstream in much variable rates during the assessment period. Avulsions, cut-offs, aggradations and river capture has been identified as controlling processes for such confluence dynamics.
Keywords: Chel river, aggradation, confluence dynamics, junction angle.
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May 2020 / by
Overhead transmission lines are important parts of a power system; their operation state directly affects the reliability level of the entire power system. With the in-depth development of state maintenance work for power grids, correctly evaluating the reliability of overhead transmission lines is the key to successful maintenance. A maintenance decision model for transmission lines is established in this study based on set pair analysis to achieve human financial control and low maintenance efficiency. Full consideration is provided to the influence of environmental factors, and a theoretical basis for transmission line maintenance decision is established.
Keywords: Overhead transmission line, state maintenance, set pair analysis, reliability.
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