The Experts below are selected from a list of 25821 Experts worldwide ranked by ideXlab platform
D P Kothari - One of the best experts on this subject based on the ideXlab platform.
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optimal thermal Generating Unit commitment a review
International Journal of Electrical Power & Energy Systems, 1998Co-Authors: Subir Sen, D P KothariAbstract:Abstract The purpose of economic thermal Unit commitment scheduling is to minimize the cost of operation subject to attainment of a certain level of security and reliability. However, in recent years, owing to environmental considerations, operation at absolute minimum cost cannot be the only objective/basis of optimal thermal Unit commitment. The environmental effect of thermal power generation is also becoming a major concern in most countries. This paper first introduces the general Unit commitment scheduling problem and then discusses various considerations, objective functions and different techniques to solve the problem. A brief critical representative survey of the existing literature available on this topic is presented. Finally, recent trends in research on Unit commitment are also discussed.
Chunlung Chen - One of the best experts on this subject based on the ideXlab platform.
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optimal wind thermal Generating Unit commitment
IEEE Transactions on Energy Conversion, 2008Co-Authors: Chunlung ChenAbstract:As wind power penetrations increase in isolated power systems, more innovative and sophisticated approaches to system operation will need to be adopted due to the intermittency and unpredictability of wind power generation. In this paper, a hybrid approach of combining branch and bound algorithm with a dynamic programming algorithm is developed to coordinate the wind and thermal generation scheduling problem for operating an isolated hybrid power system reliably and efficiently. Several technique constraints are applied to determine the maximum proportion of wind generator capacity that can be integrated into the system. A simplified dispatch based on the direct search method (DSM) is also introduced to relieve the computational burden further. Numerical experiments are included to understand the wind generator capacity in production cost analysis and to provide valuable information for both operational and planning problems.
Subir Sen - One of the best experts on this subject based on the ideXlab platform.
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optimal thermal Generating Unit commitment a review
International Journal of Electrical Power & Energy Systems, 1998Co-Authors: Subir Sen, D P KothariAbstract:Abstract The purpose of economic thermal Unit commitment scheduling is to minimize the cost of operation subject to attainment of a certain level of security and reliability. However, in recent years, owing to environmental considerations, operation at absolute minimum cost cannot be the only objective/basis of optimal thermal Unit commitment. The environmental effect of thermal power generation is also becoming a major concern in most countries. This paper first introduces the general Unit commitment scheduling problem and then discusses various considerations, objective functions and different techniques to solve the problem. A brief critical representative survey of the existing literature available on this topic is presented. Finally, recent trends in research on Unit commitment are also discussed.
Hanoch Ben Haim - One of the best experts on this subject based on the ideXlab platform.
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A multi-state Markov model for a short-term reliability analysis of a power Generating Unit
Reliability Engineering & System Safety, 2012Co-Authors: Anatoly Lisnianski, David Elmakias, David Laredo, Hanoch Ben HaimAbstract:This paper presents a multi-state Markov model for a coal power Generating Unit. The paper proposes a technique for the estimation of transition intensities (rates) between the various Generating capacity levels of the Unit based on field observation. The technique can be applied to such Units where output Generating capacity is uniformly distributed. In order to estimate the transition intensities a special Markov chain embedded in the observed capacity process was defined. By using this technique, all transition intensities can be estimated from the observed realization of the Unit Generating capacity stochastic process. The proposed multi-state Markov model was used to calculate important reliability indices such as the Forced Outage Rate (FOR), the Expected Energy Not Supplied (EENS) to consumers, etc. These indices were found for short-time periods (about 100h). It was shown that these indices are sensibly different from those calculated for a long-term range. Such Markov models could be very useful for power system security analysis and short-term operating decisions.
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a multi state markov model for a short term reliability analysis of a power Generating Unit
Reliability Engineering & System Safety, 2012Co-Authors: Anatoly Lisnianski, David Elmakias, David Laredo, Hanoch Ben HaimAbstract:Abstract This paper presents a multi-state Markov model for a coal power Generating Unit. The paper proposes a technique for the estimation of transition intensities (rates) between the various Generating capacity levels of the Unit based on field observation. The technique can be applied to such Units where output Generating capacity is uniformly distributed. In order to estimate the transition intensities a special Markov chain embedded in the observed capacity process was defined. By using this technique, all transition intensities can be estimated from the observed realization of the Unit Generating capacity stochastic process. The proposed multi-state Markov model was used to calculate important reliability indices such as the Forced Outage Rate (FOR), the Expected Energy Not Supplied (EENS) to consumers, etc. These indices were found for short-time periods (about 100 h). It was shown that these indices are sensibly different from those calculated for a long-term range. Such Markov models could be very useful for power system security analysis and short-term operating decisions.
A. V. Sergeyev - One of the best experts on this subject based on the ideXlab platform.
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Implementation of the Automatics for Switching the Combined-Cycle Plant of Power-Generating Unit No. 5 at Hrazdan Thermal Power Plant to the Steam Power Plant and Gas Turbine Modes
Thermal Engineering, 2019Co-Authors: K. B. Sargsyan, S. Kh. Yeritsyan, V. S. Voskanyan, A. S. Antonyan, G. G. Tokmajyan, L. L. Grekhov, S. V. Ivanova, A. V. SergeyevAbstract:The article describes an automated technology put into practice for switching power-Generating Unit no. 5 at Hrazdan Thermal Power Plant from the combined-cycle plant (CCP) mode to the steam power plant or gas-turbine Unit (SPP and GTU, respectively) modes upon an emergency shutdown of the gas or steam turbine. The layout of the power Unit based on the waste-gas heat utilization scheme enables the thermal power plant to operate with a partial mix of the equipment, viz., without the gas turbine or steam turbine. However, the initial project did not provide for changing the operational mode without the total shutdown of the power Unit. During a sudden shutdown, the considerable Unit output of the power Unit results in considerable disturbances in the entire electric power system of the Republic of Armenia. The maintenance of a partial capacity of the power Unit under emergency shutdown of the equipment reduces unwanted consequences for both the power plant and the electric power system as a whole. A great scope of urgent switching operations and changes in the automatic regulator settings upon sudden shutdown of the gas or steam turbine makes successful actions of the operator under the manual changeover from the CPP mode to the SPP or GTU modes unlikely. Such a changeover can be performed only by the automatics with the operator performing fine correction of the mode upon completion of first-priority switching operations if necessary. The appropriate algorithms for automatic change of the mode when shutting down the gas or steam turbine were implemented in the Automated Process Control System (APCS) of the power Unit. In the article, the basic scope and the sequence of actions performed by the automatic devices upon shutting down the gas or steam turbine, as well as the principles of automatic adjustment of the circuits for automated control of the fuel-to-water and fuel-to-air ratios and the temperature conditions of the boiler, are set forth. The article also provides the results of full-scale tests and an example of the behavior of the basic parameters upon shutting down the gas turbine and switching the power Unit over to the SPP mode.
