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Optimal Location of Upfc to Improve Power System Voltage Stability Using Artificial Bee Colony Algorithm
Issue:
Volume 8, Issue 2, March 2019
Pages:
42-49
Received:
17 January 2019
Accepted:
7 March 2019
Published:
9 April 2019
Abstract: In this paper a heuristic technique based optimal location of UPFC to improve the performance of power system is proposed. Here, the maximum power loss bus is identified as the most suitable location for fixing the UPFC. Generator outage affects the power flow constraints such as power loss, voltage, real and reactive power flow. Generator outage at different buses is introduced and the performance of the system is analyzed. The optimum location has been determined using the Artificial Bee Colony Algorithm (ABC) under this condition. By connecting UPFC at optimal location given by ABC algorithm, the power loss in the system is reduced and voltage profile is improved. Proposed work is implemented in the MATLAB and tested on IEEE 30 bus system. Initially the single generator outage is introduced at different buses in the system and afterwards double generator outage is introduced. In these conditions, the voltage profile and the power loss is analyzed at normal condition, outage condition and after connecting UPFC whose location given by proposed ABC algorithm. Performance of this algorithm is evaluated by comparing the results with those of different techniques. The comparison results demonstrate the superiority of the proposed approach and confirm its potential to solve the voltage stability problem.
Abstract: In this paper a heuristic technique based optimal location of UPFC to improve the performance of power system is proposed. Here, the maximum power loss bus is identified as the most suitable location for fixing the UPFC. Generator outage affects the power flow constraints such as power loss, voltage, real and reactive power flow. Generator outage a...
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Application of Power Electronic Circuitry for Elimination of Flywheel in Process Machines
Vasant Jape,
Hiralal Suryawanshi,
Jayant Modak
Issue:
Volume 8, Issue 2, March 2019
Pages:
50-55
Received:
16 February 2019
Accepted:
25 March 2019
Published:
22 April 2019
Abstract: It is felt highly probable to eliminate flywheel from the design of any process machine in general and for process machines with a certain demand torque characteristics in particular. It is felt that by proper interfacing of power electronic devices this may be possible. Elimination of flywheel from process machines helps reducing torsional vibrations in the power transmission system of any process machine. This should reduce fatigue in the components of power transmission system thereby prolonging equipment functional failure. Down time will be much less and profit earnings through uninterrupted production would be high. This paper proposes a convenient power electronic circuitry with reasonable control approach for the flywheel replacement of an induction motor for which it is necessary to generate supply torque at motor shaft exactly equal to demand torque. To meet this requirement, demand torque characteristic is sampled at 25 msec. In proposed solution to this problem, the torque requirement at every sample is met by adjusting the firing angle of thyristors which in turn adjusts the supply voltage at motor terminals. Depending on supply frequency the sampling period for demand torque characteristic may be varied. The present paper has a focus of evolving the details of functional feasibility of this concept only.
Abstract: It is felt highly probable to eliminate flywheel from the design of any process machine in general and for process machines with a certain demand torque characteristics in particular. It is felt that by proper interfacing of power electronic devices this may be possible. Elimination of flywheel from process machines helps reducing torsional vibrati...
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Example Application of LGGH High-efficiency Coal-fired Flue Gas Treatment Technology in Yudian Dabu Power Plant
Liao Zeng’an,
Luo Rusheng,
Lin Xiang,
Xie Qingliang
Issue:
Volume 8, Issue 2, March 2019
Pages:
56-61
Received:
21 February 2019
Accepted:
15 April 2019
Published:
17 May 2019
Abstract: This paper describes the severe air pollution and ultra-low emission process route in China today, based on which it studies and analyzes the LGGH high-efficiency coal-fired flue gas treatment technology applicable to the upgrading of the ultra-low emission with respect to its origin, composition, characteristics and advantages. Then this paper gives a case study on the application of this technology in Yudian Dabu Power Plant where ultra-low emission is required, in particular the project profile of Yudian Dabu Power Plant, and specific proposal, process layout, main design parameters, technical features and operating result of the technology in the power plant. According to the testing, after this technology is put into use in the plant, the dust and SO3 emissions of Unit 2# chimney drop to 2.3mg/m3 and 2.4 mg/m3 respectively, much lower than the national ultra-low emission limits. All these can demonstrate that the large-scale coal-fired power units can achieve a significant result by adopting the optimized LGGH high-efficiency coal-fired flue gas treatment technology, this technology provides higher precipitation efficiency, energy conservation and emission reduction, and high-efficiency SO3 removal, solves the problem of "Gypsum rain" and visual pollution, and realizes dry chimney discharge, indicating that this technology deserves promotion and has great potential to become a popular post-combustion flue gas treatment technology.
Abstract: This paper describes the severe air pollution and ultra-low emission process route in China today, based on which it studies and analyzes the LGGH high-efficiency coal-fired flue gas treatment technology applicable to the upgrading of the ultra-low emission with respect to its origin, composition, characteristics and advantages. Then this paper giv...
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Multi-Functionality Control, Power Filtering Single-Phase Grid-Connected Photovoltaic System
Arckarakit Chaithanakulwat
Issue:
Volume 8, Issue 2, March 2019
Pages:
62-70
Received:
26 February 2019
Accepted:
12 April 2019
Published:
17 May 2019
Abstract: This research proposes the control power filtering single-phase grid-connected photovoltaic system using a single stage converter with active and reactive power filter functionality (ARPFF). The proposed system offers multi-functionality, namely the excessive power transfer from the nonlinear load on the grid, simultaneously acting as an active power filter to compensate for reactive power and to mitigate harmonics of the grid current resulting in nearly unity grid power factor, the capability of reactive power control and maximum power point tracking of the photovoltaic modules. The implemented system tested under various conditions such as power transfer with different current command throughout maximum power point transfer at different insolation, a step change in nonlinear load level, and reactive power control supplied to the grid. The experimental results are in accordance showing the correctness of the proposed technique.
Abstract: This research proposes the control power filtering single-phase grid-connected photovoltaic system using a single stage converter with active and reactive power filter functionality (ARPFF). The proposed system offers multi-functionality, namely the excessive power transfer from the nonlinear load on the grid, simultaneously acting as an active pow...
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