Gotowe bibliografie tematyczne / Cascaded tripping

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Gotowa bibliografia na temat „Cascaded tripping”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Cascaded tripping"

Nobahar Sadeghi, Amir, Kutluk Bilge Arıkan, Mehmet Efe Özbek i Besim Baranoğlu. "Robust and adaptive control design of a drilling rig during the operating modes". Measurement and Control 52, nr 5-6 (15.04.2019): 702–19. http://dx.doi.org/10.1177/0020294019836121.

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Oil well drilling towers have different operating modes during a real operation, like drilling, tripping, and reaming. Each mode involves certain external disturbances and uncertainties. In this study, using the nonlinear model for the modes of the operation, robust and/or adaptive control systems are designed based on the models. These control strategies include five types of controllers: cascaded proportional–integral–derivative, active disturbance rejection controller, loop shaping, feedback error learning, and sliding mode controller. The study presents the design process of these controllers and evaluates the performances of the proposed control systems to track the reference signal and reject the uncertain forces including the parametric uncertainties and the external disturbances. This comparison is based on the mathematical performance measures and energy consumption. In addition, three architectures are presented to control the weight on bit during drilling process, and also to maintain a preset constant weight on bit, two control approaches are designed and presented.

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Ali El-Sayed, Loai Mohamed, Doaa Khalil Ibrahim, Mahmoud Ibrahim Gilany i Aboul’Fotouh El’Gharably. "An accurate technique for supervising distance relays during power swing". Indonesian Journal of Electrical Engineering and Computer Science 21, nr 3 (10.03.2021): 1279. http://dx.doi.org/10.11591/ijeecs.v21.i3.pp1279-1290.

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Power swing is a power system transient phenomenon that arises due to several reasons including line switching, line outage, sudden increment or decrement in load, faults, etc. Unnecessary tripping during power swing and unnecessary blocking for faults occur during power swing result in distance relay maloperation. Several cascaded outages and major worldwide blackouts have occurred due to maloperation of distance relays. This paper proposes a technique for supervising distance relays during power swing. The proposed online technique discriminates real faults and power swing accurately. It relies on constructing a locus diagram for the current and voltage differences (∆I-∆V) between the two ends of the protected line. The locus is estimated at every power frequency cycle to continuously monitor the state of the line by utilizing the synchrophasor measurements at the sending and receiving ends of the line. The proposed technique is tested for two-area, four-machine power system under faults at different locations of zone-1 and zone-2 regions of distance relays, fault resistances, fault inception angles and slip frequencies using MATLAB software. The simulation results proved the superior improvement of distance relay performance for handling power swing blocking and unblocking actions.

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Abd Shukor, Saiful Firdaus, Ismail Musirin, Zulkifli Abd Hamid, Mohamad Khairuzzaman Mohamad Zamani, Mohamed Zellagui i Hadi Suyono. "Intelligent based technique for under voltage load shedding in power transmission systems". Indonesian Journal of Electrical Engineering and Computer Science 17, nr 1 (1.01.2020): 110. http://dx.doi.org/10.11591/ijeecs.v17.i1.pp110-117.

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<p>The increasing demand of electric power energy and the presence of disturbances can be identified as the factors of voltage instability condition in a power system. A secure and reliable power system should be considered to ensure smooth delivery of electricity to the consumers. A power system may experience undesired event such as voltage instability condition leading to voltage collapse or cascading collapse if the system experiences lack of reactive power support. Thus, to avoid blackout and cascaded tripping, load shedding is the last resort to prevent a total damage. Under Voltage Load Shedding (UVLS) scheme is one of the possible methods which can be conducted by thepower system operators to avoid the occurrence of voltage instability condition. This paper presents the intelligent based technique for under voltage load shedding in power transmission systems. In this study, a computational based technique is developed in solving problem related to UVLS. The integration between a known computational intelligence-based technique termed as Evolutionary Programming (EP) with the under-voltage load shedding algorithm has been able to maintain the system operated within the acceptable voltage limit. Loss and minimum voltage control as the objective function implemented on the IEEE 30-Bus Reliability Test System (RTS) managed to optimally identify the optimal location and sizing for the load shedding scheme. Results from the studies, clearly indicate the feasibility of EP for load shedding scheme in loss and minimum voltage control in power system.</p>

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Kapoor, Mansi, Jaikaran Singh, Arvind Kumar Sharma i Mayur Agarwal. "Protection of Power System Using Sequential Tripping". International Journal of Advance Research and Innovation 2, nr 1 (2014): 89–95. http://dx.doi.org/10.51976/ijari.211417.

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This paper describes a Sequential Tripping Strategy used in an electrical power system to combat situations in which protection relays have maloperated or information is missing. This is an innovative back-up protection scheme designed to prevent the occurrence of widespread blackouts. It evaluates the certainty that transmission lines are likely to be affected by the fault and uses a Sequential Tripping Strategy to isolate the fault if a firm decision is not available due to maloperated relays and/or missing information. The mode of analysis and the Sequential Tripping Strategy ensures that the fault can be cleared at minimum risk to the network. In applications like power stations and continuous process control plants, a protection system is used to trip faulty systems to prevent damages and ensure the overall safety of the personnel and machinery. But this often results in multiple or cascade tripping of a number of subunits. Looking at all the tripped units doesn't reveal the cause of failure. It is therefore very important to determine the sequence of events that have occurred in order to exactly trace out the cause of failure and revive the system with minimal loss of time.

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Régis, Koch, Sanjosé Marlène i Moreau Stéphane. "Aerodynamic investigation of a linear cascade with tip gap using large-eddy simulation". Journal of the Global Power and Propulsion Society 5 (7.04.2021): 39–49. http://dx.doi.org/10.33737/jgpps/133601.

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The flow in a linear compressor cascade with tip gap is simulated using a wall-resolved compressible Large-Eddy Simulation. The cascade is based on the Virginia Tech Low Speed Cascade Wind Tunnel. The Reynolds number based on the chord is 3.88 x 10⁵ and the Mach number is 0.07. The gap considered in this study is 4.0 mm (2.9% of axial chord). An aerodynamic analysis of the tip-leakage flow allow us identifying the main mechanisms responsible for the development and the convection of the tip-leakage vortex downstream of the cascade. A region of high turbulence and vorticity levels is located along an ellipse that borders the top of the tip-leakage vortex. The influence of the airfoil suction side boundary layer development on the tip-leakage vortex is highlighted by tripping the flow. A tripped boundary layer induces a stronger and larger tip-leakage vortex that tends to move further away from the airfoil suction side and from the endwall compared with an untripped flow. The boundary layer turbulent state influences the tip-leakage flow development.

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Pokhrel, Abhishek, Hemlal Bhattarai, Sarda Chuwan, Yeshi Selden, Abiskar Chhetri i Bikram Chhetri. "POWER SYSTEM RESTORATION OF EASTERN GRID OF BHUTAN USING DIGSILENT POWERFACTORY". International Journal of Engineering Applied Sciences and Technology 7, nr 1 (1.05.2022): 147–52. http://dx.doi.org/10.33564/ijeast.2022.v07i01.022.

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Power system repair and restoration is a novel problem in power system as it is concerned with the reliability. However, it is a challenge to achieve a highly reliable power system due to various contingencies occurring in it. These unpredictable events result in overloading of some part of the system and sometimes it even followed by cascade tripping of transmission line, power plant and result in a total shut down of the system. Therefore, it’s very important to have black start plans for the system and prepare a black start operation procedure to recover the system in minimum duration. This report presents some to strategies to restore the eastern grind of Bhutan in the event of total and partial black out.

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FERRELLJR, J. "Tripping the switch fantastic: how a protein kinase cascade can convert graded inputs into switch-like outputs". Trends in Biochemical Sciences 21, nr 12 (grudzień 1996): 460–66. http://dx.doi.org/10.1016/s0968-0004(96)20026-x.

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Gajare, Swaroop, J. Ganeswara Rao, O. D. Naidu i Ashok Kumar Pradhan. "Wide-area measurement system-based supervision of protection schemes with minimum number of phasor measurement units". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, nr 2100 (10.07.2017): 20160295. http://dx.doi.org/10.1098/rsta.2016.0295.

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Cascade tripping of power lines triggered by maloperation of zone-3 relays during stressed system conditions, such as load encroachment, power swing and voltage instability, has led to many catastrophic power failures worldwide, including Indian blackouts in 2012. With the introduction of wide-area measurement systems (WAMS) into the grids, real-time monitoring of transmission network condition is possible. A phasor measurement unit (PMU) sends time-synchronized data to a phasor data concentrator, which can provide a control signal to substation devices. The latency associated with the communication system makes WAMS suitable for a slower form of protection. In this work, a method to identify the faulted line using synchronized data from strategic PMU locations is proposed. Subsequently, a supervisory signal is generated for specific relays in the system for any disturbance or stressed condition. For a given system, an approach to decide the strategic locations for PMU placement is developed, which can be used for determining the minimum number of PMUs required for application of the method. The accuracy of the scheme is tested for faults during normal and stressed conditions in a New England 39-bus system simulated using EMTDC/PSCAD software. With such a strategy, maloperation of relays can be averted in many situations and thereby blackouts/large-scale disturbances can be prevented. This article is part of the themed issue ‘Energy management: flexibility, risk and optimization’.

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Goldstein, R. J., H. P. Wang i M. Y. Jabbari. "Darryl E. Metzger Memorial Session Paper: The Influence of Secondary Flows Near the Endwall and Boundary Layer Disturbance on Convective Transport From a Turbine Blade". Journal of Turbomachinery 117, nr 4 (1.10.1995): 657–65. http://dx.doi.org/10.1115/1.2836585.

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A naphthalene sublimation technique is used to investigate convective transport from a simulated turbine blade in a stationary linear cascade. In some of the tests undertaken, a trip wire is stretched along the span of the blade near the leading edge. The disturbance produced by tripping the boundary layers on the blade near the leading edge causes early boundary layer transition, creates high mass transfer rate on the pressure side and in the laminar flow region on the suction side, but lowers the transfer rate in the turbulent flow region on the suction side. Comparison is made with other heat and mass transfer studies in the two-dimensional region far from the endwall and good agreement is found. Near the endwall, flow visualization indicates a strong secondary flow pattern. The impact of vortices initiated near the endwall on the laminar–turbulent transition extends three-dimensional effects to about 0.8 chord lengths on the suction side and to about 0.2 chord lengths on the pressure side away from the endwall. The effect of the passage vortex and the new vortex induced by the passage vortex on mass transfer is clearly seen and can be traced along the suction surface of the blade. Close to the endwall the highest mass transfer rate on the suction surface is not found near the leading edge. It occurs at about 27 percent of the curvilinear distance from the stagnation line to the trailing edge where a strong main flow and the secondary passage flow from the pressure side of the adjacent blade interact. The influences of some small but very intense corner vortices and the passage vortex on mass transfer are also observed on both surfaces of the blade.

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"ANALYSIS OF CASCADE TRIPPING & BLACKOUT AND MODERN DEFENSE SYSTEM". International Journal of Advance Engineering and Research Development 3, nr 02 (28.02.2015). http://dx.doi.org/10.21090/ijaerd.ncrretee04.

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Rozprawy doktorskie na temat "Cascaded tripping"

Li, Juan. "Identification of cascaded generator over-excitation tripping events". [Ames, Iowa : Iowa State University], 2007.

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Jena, Manas Kumar. "Application of synchrophasor measurements for enhanced back-up protection and situational awareness". Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7613.

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Streszczenia konferencji na temat "Cascaded tripping"

Badrzadeh, B., R. C. Wilson i K. S. Smith. "Investigation of a cascaded tripping incident". W 2012 IEEE Power & Energy Society General Meeting. New Energy Horizons - Opportunities and Challenges. IEEE, 2012. http://dx.doi.org/10.1109/pesgm.2012.6343935.

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Saad, Saad M., Haytham Yousef Mustafa, Naser El Naily, A. Alagori, M. Kasail i Faisal A. Mohamed. "An Improved Overcurrent-Distance Coordination Strategy to Minimize Cascaded Tripping Problem in Protection of Distribution Systems: A Case Study for The Libyan Distribution System". W 2021 IEEE 1st International Maghreb Meeting of the Conference on Sciences and Techniques of Automatic Control and Computer Engineering MI-STA. IEEE, 2021. http://dx.doi.org/10.1109/mi-sta52233.2021.9464464.

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Grippo, Eugenio, i Edmond Jonckheere. "Anticipation of Line Tripping Cascade by Grid Curvature and Entropy". W 2021 International Conference on Electrical, Computer and Energy Technologies (ICECET). IEEE, 2021. http://dx.doi.org/10.1109/icecet52533.2021.9698526.

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Mishra, Chetan, James S. Thorp, Virgilio A. Centeno i Anamitra Pal. "Transient Stability Assessment of Cascade Tripping of Renewable Sources Using SOS". W 2018 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2018. http://dx.doi.org/10.1109/pesgm.2018.8586291.

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Jeevitha, A., i S. Devi. "Symmetrical fault detection of distance relay to prevent cascade tripping during power swing". W 2015 Online International Conference on Green Engineering and Technologies (IC-GET). IEEE, 2015. http://dx.doi.org/10.1109/get.2015.7453801.

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Min, Byung-Young, Jongwook Joo, Jomar Mendoza, Jin Lee, Guoping Xia i Gorazd Medic. "Large-Eddy Simulation of Corner Separation in a Compressor Cascade". W ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77144.

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In this paper, wall-resolved LES computations for a compressor cascade from Ecole Centrale de Lyon [1] are presented. A computational grid containing about 600 million computational cells was used in these simulations. This grid resolves the details of tripping strips used in the experiments, located near the leading edge of the blade on both suction and pressure sides. Endwall turbulent boundary layer at cascade inlet was measured to be at a momentum thickness based Reynolds number of about 7000 to 8000, with quite a bit of variation in the pitchwise direction. In order to avoid the cost of simulating the entire duct upstream of the cascade, and any auxiliary flat plate boundary layer simulations, the inlet fluctuations for LES computations were generated using digital filtering method for synthetic turbulence generation [27]. Turbulence statistics from a database of high fidelity eddy simulations of flat plate boundary layers (at similar Reynolds numbers) from KTH Royal Institute of Technology in Stockholm [28] were used to fully define the properties of the cascade inlet boundary layer. In this paper, time-averaged results from three LES computations for this configuration are presented — one with no inlet fluctuations at the cascade endwall at the domain inlet, and then two computations with inlet fluctuations and boundary layers at Reθ of 7000 and 8183. These provide a sensitivity of LES predictions of corner separation in the cascade to the boundary layer thickness at cascade inlet. A comparison of these simulations with prior DDES (and RANS) simulations from UTRC [26], as well as existing LES results from Ecole Centrale de Lyon [12], allows to further the understanding of critical elements of the endwall flow physics. More specifically, it provides more insight into which phenomena need to be sufficiently resolved (e.g. horseshoe vortex) in order to capture both the average behavior of the corner separation, as well as its unsteady dynamics. In addition, it provides new information which will help define best practice guidelines for the use of eddy simulations to resolve endwall features in compressors at off-design conditions.

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Jin, Yan. "Parameter Extension Simulation of Turbulent Flows in a Compressor Cascade With a High Reynolds Number". W ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14809.

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Abstract The turbulent flow in a compressor cascade is calculated by using a new simulation method, i.e., parameter extension simulation (PES). It is defined as the calculation of a turbulent flow with the help of a reference solution. A special large-eddy simulation (LES) method is developed to calculate the reference solution for PES. Then, the reference solution is extended to approximate the exact solution for the Navier-Stokes equations. The Richardson extrapolation is used to estimate the model error. The compressor cascade is made of NACA0065-009 airfoils. The Reynolds number 3.82 × 105 and the attack angles −2° to 7° are accounted for in the study. The effects of the end-walls, attack angle, and tripping bands on the flow are analyzed. The PES results are compared with the experimental data as well as the LES results using the Smagorinsky, k-equation and WALE subgrid models. The numerical results show that the PES requires a lower mesh resolution than the other LES methods. The details of the flow field including the laminar-turbulence transition can be directly captured from the PES results without introducing any additional model. These characteristics make the PES a potential method for simulating flows in turbomachinery with high Reynolds numbers.

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Funazaki, Ken-ichi, Nozomi Tanaka, Takahiro Shiba, Haruyuki Tanimitsu i Masaaki Hamabe. "Studies on Two-Dimensional Contouring of High-Lift Turbine Airfoil Suction Surface as Separation-Control Device: Separation Suppression Under Steady-State Flow Conditions". W ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45156.

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The study the present authors have been working on is to develop a new method to increase aerodynamic loading of low-pressure turbine airfoils for modern aeroengines to a great extent, which is to achieve drastic reduction of their airfoil counts. For this purpose, this study proposes two-dimensional contouring of the airfoil suction surface as a device to suppress the separation bubble that causes large aerodynamic loss, especially at low Reynolds number condition. The main objective of this paper is to show how and to what extent the surface contouring without any other disturbances affects the suction surface boundary layer accompanying separation bubble. For comparison, rather conventional tripping wire technique is also employed as “local 2D surface contouring” to generate flow disturbances in order to suppress the separation bubble. All measurements are carried out under steady-state flow conditions with low freestream turbulence. It turns out from the detailed experiments and LES analysis that the newly proposed two-dimensional contouring of the airfoil surface can effectively suppress the separation bubble, resulting in significant improvement of cascade aerodynamic performance.

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Goldstein, R. J., H. P. Wang i M. Y. Jabbari. "The Influence of Secondary Flows Near the Endwall and Boundary Layer Disturbance on Convective Transport From a Turbine Blade". W ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-165.

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A naphthalene sublimation technique is used to investigate convective transport from a simulated turbine blade in a stationary linear cascade. In some of the tests undertaken a trip wire is stretched along the span of the blade near the leading edge. The disturbance produced by tripping the boundary layers on the blade near the leading edge causes early boundary layer transition, creates high mass transfer rate on the pressure side and in the laminar flow region on the suction side, but lowers the transfer rate in the turbulent flow region on the suction side. Comparison is made with other heat and mass transfer studies in the two dimensional region far from the endwall and good agreement is found. Near the endwall, flow visualization indicates a strong secondary flow pattern. The impact of vortices initiated near the endwall on the laminar-turbulent transition extends three dimensional effects to about 0.8 chord lengths on the suction side and to about 0.2 chord lengths on the pressure side away from the endwall. The effect of the passage vortex and the new vortex induced by the passage vortex on mass transfer is clearly seen and can be traced along the suction surface of the blade. Close to the endwall the highest mass transfer rate on the suction surface is not found near the leading edge. It occurs at about 27% of the curvilinear distance from the stagnation line to the trailing edge where a strong main flow and the secondary passage flow from the pressure side of the adjacent blade interact. The influences of some small but very intense corner vortices and the passage vortex on mass transfer are also observed on both surfaces of the blade.

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