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Relevant bibliographies by topics / Crowbar Operation

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Journal articles

Academic literature on the topic 'Crowbar Operation'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Crowbar Operation"

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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