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Journal articles on the topic 'Crowbar Operation'

Author: Grafiati

Published: 6 September 2023

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1

Ling, Yu, Zhenlan Dou, Qiang Gao, and Xu Cai. "Improvement of the Low-Voltage Ride-through Capability of Doubly Fed Induction Generator Wind Turbines." Wind Engineering 36, no. 5 (2012): 535–51. http://dx.doi.org/10.1260/0309-524x.36.5.535.

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So far, active crowbars are a preferred technique for doubly fed induction generator (DFIG) wind turbines, which is used to protect the power converter against over-current and undesirably high dc link voltage during voltage dip. However, its main drawbacks are that (1) the DFIG absorbs reactive power from the grid during grid voltage dips, (2) the crowbar activation increases the acceleration of the rotor and so, deteriorates the dynamic stability of DFIG, and (3) the control is not flexible for long-time voltage sags. In the paper, three different initiating logic control methods of crowbar

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2

Rihan, Mahmoud, Mahmoud Nasrallah, Barkat Hasanin, and Adel El-Shahat. "A Proposed Controllable Crowbar for a Brushless Doubly-Fed Reluctance Generator, a Grid-Integrated Wind Turbine." Energies 15, no. 11 (2022): 3894. http://dx.doi.org/10.3390/en15113894.

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Brushless doubly fed reluctance generators (BDFRGs) are hopeful generators for using inside variable speed wind turbines (VSWTs), as these generators introduce a promising economical value because of their lower manufacturing and maintenance costs besides their higher reliability. For integrating WT generators, global networks codes require enabling these generators to stay connected under grid disturbances. The behavior of the BDFRG is strongly affected by grid disturbances, due to the small rating of the used partial power converters, as these converters cannot withstand high faults currents

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3

Li, Yin Xing, Peng Hui Liu, and Jun Li Zhang. "Research on Low Voltage Ride-Through Technique in DD-PMSG Wind Power Generator System." Applied Mechanics and Materials 300-301 (February 2013): 108–11. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.108.

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In order to achieve the power grid voltage default ride-through, the permanent magnet direct-drive type wind power generator system is employed. The Crowbar resistance and the STATCOM operation mode are two effective methods to control the DC capacitor voltage not to rise and to help the power grid voltage restoration. The power grid voltage default is little and the STATCOM operation mode is applied. The Crowbar resistance is invested to the wind power generator system when the voltage default is large. The methods introduced in this paper are applied in other variable speed fixed frequency w

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4

Zhang, Dahai, Ying Chen, Jing Yang, Ming Tan, Xiandong Ma, and Wei Li. "Fault Ride-Through Analysis and Protection of a 2-MW DFIG Tidal Current Turbine." Marine Technology Society Journal 49, no. 5 (2015): 49–57. http://dx.doi.org/10.4031/mtsj.49.5.1.

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AbstractThe purposes of this article are to report on a study of fault ride-through (FRT) capability improvements of a tidal current turbine with a doubly fed induction generator (DFIG) and to investigate protection schemes for power electronic converters without disconnection during grid faults. A dynamic model of a DFIG tidal current turbine is described in the article, taking into account the effect of crowbar protection on the system when subjected to disturbances, such as short circuit faults. Investigations into the dynamic behavior of tidal current turbines are made through extensive si

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5

Su, Yinsheng, Sijia Tu, Guanghu Xu, et al. "Short-circuit Current Engineering Calculation Method Considering Crowbar Operation Priority Degree of DFIG." Journal of Physics: Conference Series 2496, no. 1 (2023): 012031. http://dx.doi.org/10.1088/1742-6596/2496/1/012031.

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Abstract When fault occurs in high wind power proportion grid, the control strategy and external characteristics of the wind power plant are affected by voltage drop of grid, so the traditional short-circuit current engineering calculation is difficult to converge. A short-circuit current engineering calculation method for high wind power proportion grid, considering grid node importance evaluation and crowbar protection of DFIG(double-fed induction generator), is proposed. This paper proposes the external equivalent model of the DFIG when fault occurs in grid, considers voltage drop degree an

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6

G, SENTHIL KUMARAN, KUMAR V J F, and DIVAKER DURAIRAJ C. "Bio-mechanical analysis on selected agricultural hand tools." Madras Agricultural Journal 91, March (2004): 5–9. http://dx.doi.org/10.29321/maj.10.a00056.

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Bio-mechanical analysis of agricultural hand tools viz. crowbar, hand hoc, spade and sickle was conducted. Pertinent anthropometric parameters of male and female farm workers of the southern districts of Tamil Nadu were measured. A bio- mechanical analysis on the work posture indicated that the reaction force on neck. for the operation of crowbar, different spades, hand hoes and sickle were 21.8, 24- 26, 17-21 and 18.9 kg respectively. The crowbar and spade caused 21.8 kg and 88- 110 kg of reaction forces respectively on biceps. The same for hand hoe and sickle was 41 and 2.6 kg respectively.

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7

Le, Thai Hiep, and Duong Hoang Phuc Tran. "Study on operating modes of doubly fed induction generator with a short circuit fault on grid near the wind power plant." Journal of Science, Quy Nhon University 15, no. 1 (2021): 37–44. http://dx.doi.org/10.52111/qnjs.2021.15104.

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In this paper, the operating mode of a doubly fed induction generator (DFIG) wind turbine is studied in order to evaluate its fault ride-through and transient stability with a grid’s short circuit fault at near the wind power plant. Based on the structure of DFIG, external resistors are directly connected to rotor windings, then the generator operates as a wound rotor induction generator (WRIG) when there is a short circuit fault on the grid. According to the simulation results in Matlab, the active power is consumed on the crowbar resistor, causing the active power characteristic of generator

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8

Yang, Xi Yun, Li Xia Li, and Ya Min Zhang. "Control for Dc-Bus Voltage Using Grid Voltage Feed-Forward and Crowbar Circuit." Applied Mechanics and Materials 448-453 (October 2013): 1727–31. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1727.

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The DC bus voltage is key variable for the operation of converter system in a wind power system. When grid voltage drops, a control of the DC bus voltage is needed to keep the smoothness of DC bus voltage for avoiding generator cutting off grid. A combined control method based on the grid voltage information feedforward with a crowbar circuit is proposed for a direct-drive wind power system in the paper. The unbalanced energy of the DC bus can be unleashed by the crowbar circuit during the dropping of grid voltage. At the same time, the output power of motor-side converter can be controlled to

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9

Chen, Jiming, Yuanhao Wang, Mingxiao Zhu, Qianyu Yu, and Jiacai Li. "Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault." Energies 12, no. 10 (2019): 1994. http://dx.doi.org/10.3390/en12101994.

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This paper introduces an improved rotor braking protection circuit configuration and the corresponding self-adaptive control strategy to enhance the low voltage ride-through (LVRT) capability of the doubly-fed induction generator (DFIG). The proposed protection circuit consists of a crowbar circuit and a series rotor braking resistor array, which guarantees the safe operation of wind generators under the LVRT. Moreover, to adapt the proposed protection and further enhance the performance of the improved configuration, a corresponding self-adaptive control strategy is presented, which regulates

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10

Onishi, Koji, Yingxiao Li, Kenta Koiwa, Fang Liu, Tadanao Zanma, and Kang-Zhi Liu. "Analysis on the operation of crowbar in doubly fed induction generators." Electric Power Systems Research 215 (February 2023): 108950. http://dx.doi.org/10.1016/j.epsr.2022.108950.

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11

Meng, Yan Feng, Shu Ju Hu, and Hong Hua Xu. "Research on an Improved Control Strategy for Enhancing LVRT Ability of DFIG System." Applied Mechanics and Materials 291-294 (February 2013): 467–71. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.467.

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Aiming at operation problems of DFIG under grid fault condition, the improved control strategy of coordinating control rotor converter and Crowbar circuit switching logic for enhancing LVRT ability is proposed. The over-current cause on the stator and rotor of DFIG under grid fault is analyzed and complete improved control strategy flow chart is given during entire voltage dip. Experimental verification results show that adopting this improved control strategy can effectively suppress the generator stator and rotor over-current and over-voltage, enhance wind turbine operation ability, and prov

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12

Xing, Zuo Xia, Lei Chen, Li Chen Xue, and Yong Xing Zhang. "The Research of Verifying Low Voltage Ride through of Double-Fed Wind Turbine Generator System and Voltage Dropping Simulation." Advanced Materials Research 347-353 (October 2011): 2380–85. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.2380.

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In order to maintain the stable operation of grid system, the grid company requires wind turbine generator system with low-voltage ride through (LVRT) capability. With this issue, the article builds a double-fed wind turbine generator system model, Crowbar circuit strategy model to protect rotor-side inverter and fault pitch control strategy model to inhibition rotor speed during grid fault. Then all the models and strategies are verified by the simulation of grid low voltage. The simulation results show that these models can complete LVRT.

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13

Xie, Zhen, and Xue Li. "The Virtual Resistance Control Strategy for HVRT of Doubly Fed Induction Wind Generators Based on Particle Swarm Optimization." Mathematical Problems in Engineering 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/350367.

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Grid voltage swell will cause transient DC flux component in the doubly fed induction generator (DFIG) stator windings, creating serious stator and rotor current and torque oscillation, which is more serious than influence of the voltage dip. It is found that virtual resistance manages effectively to suppress rotor current and torque oscillation, avoid the operation of crowbar circuit, and enhance its high voltage ride through technology capability. In order to acquire the best virtual resistance value, the excellent particle library (EPL) of dynamic particle swarm optimization (PSO) algorithm

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14

Kalyani, V. Mohana, J. Preetha Roselyn, C. Nithya, and D. Devaraj. "Enhanced Crowbar Protection for Fault Ride through Capability of Wind Generation Systems." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 4 (2016): 1366. http://dx.doi.org/10.11591/ijpeds.v7.i4.pp1366-1376.

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Due to increasing demand in power, the integration of renewable sources like wind generation into power system is gaining much importance nowadays. The heavy penetration of wind power into the power system leads to many integration issues mainly due to the intermittent nature of the wind and the desirability for variable speed operation of the generators. As the wind power generation depends on the wind speed, its integration into the grid has noticeable influence on the system stability and becomes an important issue especially when a fault occurs on the grid. The protective disconnection of

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15

Sadara, Wara, and Bunlung Neammanee. "Dynamic Behavior of Flexible Drive Train Models and Back-to-Back Converter for DFIG Wind Turbines during Voltage Sags." Applied Mechanics and Materials 704 (December 2014): 170–79. http://dx.doi.org/10.4028/www.scientific.net/amm.704.170.

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This paper proposes an accurate complete model of a DFIG wind turbine composed of the flexible drive train model, the DFIG, the back-to-back converter, the protection systems, and the control techniques. The simulations use the Matlab/Simulink program to investigate the dynamic behavior of these parts on the 2 MW wind turbine. The simulations show the complete dynamic behavior of electrical and mechanical under normal operation, and voltage sags. Moreover the control logic of an active crowbar protection during high rotor current, and the control logic of a DC-chopper protection during high DC

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16

YAMADA, Manabu, Masaki HAYATSU, Kouichi KAJIWARA, Yasutaka TAGAWA, and Daisuke YAMAGUCHI. "2P2-D11 Development of rescue devices designed for citizen : Development of power-assisted hoist and crowbar jack for rescue operation." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2006 (2006): _2P2—D11_1—_2P2—D11_4. http://dx.doi.org/10.1299/jsmermd.2006._2p2-d11_1.

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17

Qin, Kaina, Shanshan Wang, and Zhongjian Kang. "Research on Zero-Voltage Ride Through Control Strategy of Doubly Fed Wind Turbine." Energies 14, no. 8 (2021): 2287. http://dx.doi.org/10.3390/en14082287.

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With the rapid increase in the proportion of the installed wind power capacity in the total grid capacity, the state has put forward higher and higher requirements for wind power integration into the grid, among which the most difficult requirement is the zero-voltage ride through (ZVRT) capability of the wind turbine. When the voltage drops deeply, a series of transient processes, such as serious overvoltage, overcurrent, or speed rise, will occur in the motor, which will seriously endanger the safe operation of the wind turbine itself and its control system, and cause large-scale off-grid ac

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18

Tuka, Milkias. "Investigation of Voltage Dip Problems during Faults on a Grid-Tied Doubly Fed Induction Generator in a Wind Energy System." Jordan Journal of Electrical Engineering 9, no. 2 (2023): 209. http://dx.doi.org/10.5455/jjee.204-1669028936.

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A voltage dip is a sudden drop of voltages - generally between 10 and 90 % of the rated RMS value - during a period lasting from half a cycle to a few seconds on the phases of the power lines. It is one of the most important power quality problems affecting the stability of the Doubly Fed Induction Generator (DFIG) in Wind Energy Conversion System (WECS) and hence needs to be analyzed for a given machine for its performance analysis under grid disturbances. When a voltage dip problem happens in the given power as of faults, the magnitude of the rotor and stator currents of DFIG get increased,

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19

Nduwamungu, Aphrodis, Etienne Ntagwirumugara, Francis Mulolani, and Waqar Bashir. "Fault Ride through Capability Analysis (FRT) in Wind Power Plants with Doubly Fed Induction Generators for Smart Grid Technologies." Energies 13, no. 16 (2020): 4260. http://dx.doi.org/10.3390/en13164260.

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Faults in electrical networks are among the key factors and sources of network disturbances. Control and automation strategies are among the key fault clearing techniques responsible for the safe operation of the system. Several researchers have revealed various constraints of control and automation strategies such as a slow dynamic response, the inability to switch the network on and off remotely, a high fault clearing time and loss minimization. For a system with wind energy technologies, if the power flow of a wind turbine is perturbed by a fault, the intermediate circuit voltage between th

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20

Loulijat, Azeddine, Najib Ababssi, and Mohammed Makhad. "DFIG use with combined strategy in case of failure of wind farm." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 3 (2020): 2221. http://dx.doi.org/10.11591/ijece.v10i3.pp2221-2234.

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In the wind power area, Doubly Fed Induction Generator (DFIG) has many advantages due to its ability to provide power to voltage and constant frequency during rotor speed changes, which provides better wind capture as compared to fixed speed wind turbines (WTs). The high sensitivity of the DFIG towards electrical faults brings up many challenges in terms of compliance with requirements imposed by the operators of electrical networks. Indeed, in case of a fault in the network, wind power stations are switched off automatically to avoid damage in wind turbines, but now the network connection req

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21

Jawaid, Saad, and Dan Cody. "Crowbar impalement: the PHEM perspective." BMJ Case Reports 11, no. 1 (2018): e227293. http://dx.doi.org/10.1136/bcr-2018-227293.

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A man in his 50s suffered an impalement on a crowbar after falling from the roof of a domestic shed. A helicopter-based prehospital emergency medical service team was called to assist in the patient’s care. The crowbar had entered from the left-upper quadrant and was tenting the skin of the right iliac fossa. Analgesia and prehospital sedation were provided to facilitate extrication. A series of improvisations were carried out to support the logistics of transferring the patient using an air ambulance to the regional major trauma centre with the crowbar in situ. The patient was taken to the op

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22

Zhai, Jia Jun, Bu Han Zhang, Kui Wang, Wen Shao, and Cheng Xiong Mao. "Symmetrical Short Circuit Current Characteristics of Doubly Fed Induction Generator Wind Turbine with Crowbar Protection." Advanced Materials Research 512-515 (May 2012): 782–87. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.782.

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Doubly fed induction generator (DFIG) is now becoming one of most widely used wind turbines in global market for wind power generation, due to its outstanding advantages. However, the DFIG is sensitive to grid faults. The DFIG will have to be removed from the grid if there’s no protection appliance in it. Therefore, the crowbar protection is widely used in the world for improving the low voltage ride-through ability of wind turbines. This paper analysed the operating characteristics and short-circuit current of DFIG under symmetrical short-circuit fault with respect to different sags to grid v

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23

Loulijat, Azeddine, Hamid Chojaa, Mouncef El marghichi, et al. "Enhancement of LVRT Ability of DFIG Wind Turbine by an Improved Protection Scheme with a Modified Advanced Nonlinear Control Loop." Processes 11, no. 5 (2023): 1417. http://dx.doi.org/10.3390/pr11051417.

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One of the problems with the doubly-fed induction generator (DFIG) is its high vulnerability to network perturbations, notably voltage dips, because of its stator windings being coupled directly to the network. As the DFIG’s stator and rotor are electromagnetically mated, the stator current peak occurs during a voltage dip causing an inrush current to the critical converter back-to-back and an overload of the DC-link capacitor. For this purpose, a series of researchers have achieved a linear and non-linear controller with a crowbar-based protection scheme. With this type of protection, the Rot

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24

Butkus, Paulius, Sonata Tolvaišienė, and Sebastjanas Kurčevskis. "Validation of a SPICE Model for High Frequency Electroporation Systems." Electronics 8, no. 6 (2019): 710. http://dx.doi.org/10.3390/electronics8060710.

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In this paper, we present an analysis and a validation of a simulation program with integrated circuit emphasis (SPICE) model for a pulse forming circuit of a high frequency electroporation system, which can deliver square-wave sub-microsecond (100–900 ns) electric field pulses. The developed SPICE model is suggested for use in evaluation of transient processes that occur due to high frequency operations in prototype systems. A controlled crowbar circuit was implemented to support a variety of biological loads and to ensure a constant electric pulse rise and fall time during electroporation to

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25

Memon, Ahsanullah, Mohd Wazir Mustafa, Shadi Khan Baloch, Attaullah Khidrani, and Touqeer Ahmed. "Dynamic response enhancement of BDFIG using vector control scheme based internal model c ontrol." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 1 (2021): 90. http://dx.doi.org/10.11591/ijeecs.v23.i1.pp90-97.

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Doublefed induction generator(DFIG) has shown tremendous success inwind turbines due to its flexibility and ability to regulate the active andreactive power. However, the presence of brushes and slip rings affects itsreliability, stability, and power quality. Furthermore, itdoes not providepromising outcomes in case of faults even in presence of the crowbar circuit.In contrast, thebrushless doubly fed induction generator(BDFIG) is a morereliable option for wind turbines than its mentioned counterpart due to theabsence of the brushes and slip rings. This research work as such attempts toimprove

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26

Verma, Rishi, J. M. V. V. S. Aravind, Pankaj Deb, et al. "Modular electromagnetic railgun accelerator for high velocity impact studies." Review of Scientific Instruments 93, no. 12 (2022): 124703. http://dx.doi.org/10.1063/5.0104365.

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A modular electromagnetic railgun accelerator facility named “RAFTAR” (i.e., Railgun Accelerator Facility for Technology and Research) has been commissioned and its performance has been characterized for high velocity impact testing on materials in a single-shot mode. In the first tests, RAFTAR demonstrated an acceleration of more than 1000 m/s for an 8 g solid aluminum-7075 armature projectile. The current fed was 220 kA, having a muzzle time of about 1.75 ms. It is a single pulse breech-fed rectangular bore (14 × 13 mm2) railgun, and its 1.15 m long barrel assembly consists of two parallel c

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27

Kelevišius, Kęstutis, Jonas Amšiejus, and Šarūnas Skuodis. "THE INFLUENCE OF CHANGING SHAFT FRICTION OF THE PILE TO WAVE PROPAGATION." Engineering Structures and Technologies 3, no. 2 (2011): 64–71. http://dx.doi.org/10.3846/skt.2011.08.

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In most cases, the bearing capacity of the pile under natural conditions can be determined by applying static and dynamic pile tests as well as the numerical modelling of a dynamic test. The integrated business problem is employed for calculating vertical displacements. This integral is calculated using the summing method. In the majority of cases, real pile strength capacity can be investigated referring to the adapted means of testing applying the mathematical model that can calculate static or dynamic investigations. The idealized scheme of a pile test is presented including a hammering sys

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28

Onishi, Koji, Yingxiao Li, Kang-Zhi Liu, Fang Liu, Kenta Koiwa, and Tadanao Zanma. "Analysis on the Operation of Crowbar in Doubly Fed Induction Generators." SSRN Electronic Journal, 2022. http://dx.doi.org/10.2139/ssrn.4116247.

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29

Nadour, Mohamed, Ahmed Essadki, and Tamou Nasser. "Improving low-voltage ride-through capability of a multimegawatt DFIG based wind turbine under grid faults." Protection and Control of Modern Power Systems 5, no. 1 (2020). http://dx.doi.org/10.1186/s41601-020-00172-w.

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AbstractLarge integration of doubly-fed induction generator (DFIG) based wind turbines (WTs) into power networks can have significant consequences for power system operation and the quality of the energy supplied due to their excessive sensitivity towards grid disturbances. Under voltage dips, the resulting overcurrent and overvoltage in the rotor circuit and the DC link of a DFIG, could lead to the activation of the protection system and WT disconnection. This potentially results in sudden loss of several tens/hundreds of MWs of energy, and consequently intensifying the severity of the fault.

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30

Yin, Jun. "Research on Short-Circuit Current Calculation Method of Doubly-Fed Wind Turbines Considering Rotor Dynamic Process." Frontiers in Energy Research 9 (May 28, 2021). http://dx.doi.org/10.3389/fenrg.2021.686146.

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With the enlarging scale of doubly-fed induction generators (DFIGs) connected to power systems, it is important to analyze the influence of a short-circuit current to system relay protection. Due to the correct evaluation of the protection operation characteristics, the DFIG short-circuit current needs to be calculated accurately. But the current research on the short-circuit current of DFIG is based on the following assumption: the rotor excitation current is zero after the rotor crowbar is put, and the influence of its dynamic process is ignored. This will bring errors to the calculation res

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31

Shan, Haoqi, Moyao Huang, Yujia Liu, et al. "CROWBAR: Natively Fuzzing Trusted Applications Using ARM CoreSight." Journal of Hardware and Systems Security, June 15, 2023. http://dx.doi.org/10.1007/s41635-023-00133-3.

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AbstractTrusted execution environments (TEE) are deployed on many platforms to provide both confidentiality and integrity, and their extensive use offers a secure environment for privacy-sensitive operations. Despite TEE prevalence in the smartphone and tablet market, vulnerability research into TEE security is relatively rare. This is, in part, due to the strong isolation guarantees provided by its implementation. In this paper, we propose a hardware assisted fuzzing framework, CROWBAR, that bypasses TEE isolation to natively evaluate trusted applications (TAs) on mobile devices by leveraging

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32

Safwat, Ayman, Mohiy E. Bahgat, A. M. Abdel-Ghany, and Helmy M. El Zoghby. "Crowbar Protection and Blades Pitch Angle Control of a Wind Turbine at Severe Faulty Conditions using Adaptive Neuro-Fuzzy Inference System." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 16 (November 3, 2022). http://dx.doi.org/10.2174/2352096516666221103102058.

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Background: Due to their superior efficiency, stability, and ability to produce maximum power under various typical operating situations, wind turbines driving doubly fed induction generator systems are frequently utilized in wind power extraction. These systems face stability problems especially at severe faulty conditions Objective: To protect the rotating parts of the system from over speeding when the fault occurs and to ensure that the generator does not deviate from stability by adjusting the aerodynamic torque of the wind turbine. In addition, to protect electrical parts of the system,

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