iosr-JEEE   Volume-18 ~ Issue-1 ~ Jan. – Feb. 2023

Abstract: In order to increase the generated power and for better wind conditions, wind turbines are getting taller, the swept area and the blade lengths have been increased, and shifted to offshore locations. All these actions increase the exposure of windplant to lightning. The blades are the most damaged in which case reparing or replacement cost is extremely large. This paper reviews lightning protection and earthing scinenareos such as the receptor, metallic cap, metallic conductor on the blade edges, metallic mesh, two ring electrode, backside electrode, combined method, enhanced method, conductive surface layer on wind turbine blade method and Knitted Soldered Copper Meshes method. Results......

[1]. V. Peesapati, I. Cotton, T. Sorensen, T. Krogh, and N. Kokkinos, "Lightning protection of wind turbines–a comparison of measured data with required protection levels," IET renewable power generation, vol. 5, pp. 48-57, 2011.
[2]. H. T. Zavareh, "Wind turbines protection against the lightning struck using a combined method," in Renewable Energy and Distributed Generation (ICREDG), 2012 Second Iranian Conference on, 2012, pp. 51-54.
[3]. M. Minowa, S. Sumi, K. Ito, and K. Horii, "A study of lightning protection for wind turbine blade by using creeping discharge characteristics," in Lightning Protection (ICLP), 2012 International Conference on, 2012, pp. 1-4.
[4]. S. Yokoyama, "Lightning protection of wind turbine blades," Electric Power Systems Research, vol. 94, pp. 3-9, 2013.
[5]. S. Madsen, K. Bertelsen, T. Krogh, H. Erichsen, A. Hansen, and K. Lønbæk, "Proposal of new zoning concept considering lightning protection of wind turbine blades," Journal of Lightning Research, vol. 4, pp. 108-117, 2012..

Abstract: The application of a DC electric motor as a drive for the grain thresher machine uses electrical energy from solar panels, which is then stored in a 24 Volt 50 Ah accumulator. This research aims to understand the characteristics and performance of a DC motor as a driver for the grain thresher machine. The research was carried out in August 2021 at the Electrical Engineering Laboratory of the Samarinda State Polytechnic.The results of testing and calculations when the engine is run without load with a 24Volt 50Ah battery, the output power is 176.24 Watt, the current is 9.15 Ampere, the motor rotational speed is 3070 RPM, and the threshing cylinder pulley speed is 745RPM. In testing the machine using a grain load of three repetitions, an average output power of 223.55....

Keywords: DC Electric Motor, Driving Motor, Motor Power, Rotational Speed

[1]. Irawan, D. and Jamaluddin. 2018. Penerapan dan Pemanfaatan Motor DC Sebagai Penggerak Sepeda Listrik Menggunakan Solar Cell, In Materials Science and Engineering, Sidoarjo doi:10.1088/1757-899X/434/1/012209.
[2]. Kuswardana, A. 2016. Analisis Sistem Motor Penggerak pada Mobil Listrik dengan Kapasitas Satu Penumpang, Thesis of Semarang State University, Semarang
[3]. Admin. 2019. Studi Elektronika. [Online]. https://www.webstudi.site/2019/08/Motor-DC.html (diakses Agustus 2019).
[4]. Siburian, J.D. 2019. Analisa Slip Transmisi Pulley dan V-Belt Pada Beban Tertentu dengan Mengguanakan Motor Berdaya Seperempat HP. Thesis of University of Islam Riau, Pekanbaru.
[5]. Mislaini, R. 2016. Rancang Bangun dan Uji Teknis Alat Perontok Padi. Andalas Agricultural Technology Journal 20 (1) : 6-7..

Abstract: Over the years, greenhouse systems have been utilized to regulate the ambient conditions of precious crops in an effort to increase agricultural productivity. The crucial elements of a typical greenhouse are the construction of a polyhouse, the placement of artificial lighting, the careful use of vents, watering methods, and the calculated application of insecticides and pesticides, among other things. Numerous factors are crucial for optimum plant development, including soil moisture, temperature, humidity, light intensity, greenhouse layout, and plant spacing. Various monitoring and control methods have been suggested and put into practice for automated greenhouses throughout the years. For parameter monitoring in different plots of a green house, a number of sensors are often........

Keywords: greenhouse monitoring, temperature, humidity, soil moisture, light intensity, GSM

[1]. Luciano Gonda, Carlos Eduardo Cugnasca,―Computers in Agriculture and Natural Resources, A Proposal of Greenhouse Control Using Wireless Sensor Networks‖, 4th World Congress Conference, Proceedings of the 24-26 July 2006 (Orlando, Florida USA).
[2]. D.D.Chaudhary , S.P.Nayse , L.M.Waghmare―Application of Wireless Sensor Networks For Greenhouse Parameter Control in Precision Agriculture‖, International Journal of Wireless & Mobile Networks (IJWMN), Vol. 3, No. 1, February 2011
[3]. J. Burrell et al. ―Vineyard computing: sensor networks in agricultural production‖, IEEE Pervasive Computing, 3(1):38–45, Jan-Mar 2004.
[4]. Blackmore, S. ―Precision Farming: An Introduction.‖, Outlook on Agriculture, Vol. 23, no. 4, pp. 275-280, 1994.
[5]. Ning Wang, Naiqian Zhang, Maohua Wang, ―Wireless sensors in agriculture and food Industry —Recent development and future perspective‖, Computers and Electronics in Agriculture, Vol. 50, pp. 1–14, 2006.

Abstract: The paper presents a case of temporary overvoltage due to complex asymmetries (two-phase interruption and two-phase short-circuit) in a 110 kV power system. It presents the conditions in which such overvoltage can occur, the results of the calculations and of some measurements made and its particularly bad consequences.
The causes that can generate such events are established and measures are proposed to avoid them......

Keywords: Temporary overvoltage; Unsymmetrical faults; Experimental checks

[1]. PouyanSaifi, Akshaya Moharana, Rajiv K. Varma, Ravi Seethapathy, Influence of distributed generation interface transformer and DG configurations on Temporary Overvoltage, Electrical and Computer Engineering, Canadian Conference, 2010.
[2]. Felipe ProençaAlbuquerquea, Ronaldo F. Ribeiro Pereiraa, Eduardo C. Marques Costaa, Luisa H. BartocciLibonib, Temporary overvoltage suppression in half-wavelength transmission lines during asymmetric faults, Electric Power Systems Research, Volume 178, January 2020.
[3]. M. Swidan, M. Awad, H. Said, F. Rizk, Temporary overvoltage measurements in the 500/400 kV interconnection system, CIGRE, Study Committee: 33, Session 2000.
[4]. RafalTarko, Wieslaw Nowak. Waldemar Szpyra, Temporary overvoltages in high-voltage power systems caused by breaks of circuit continuity during single-phase earth faults, IET Generation, Transmission & Distribution , Volume: 14 , Issue: 4 , 2020.
[5]. M. Blundell, C. Liu, J. Lopez-Roldan, W. Naude, Effect of Temporary Overvoltages on Transmission Network Equipment, Australian Journal of Electrical and Electronics Engineering 5(2):107-118, 2009..

Abstract: In the present world, the photovoltaic system shows a leading role in the power distribution system as a most significant renewable energy source. The improved power quality and harmonics mitigation are the key consideration in our presented grid-connected PV system.This paper presents the performance analysis of active power filter (APF) to eliminate harmonics currents, power factor correction, and compensate reactive power to get maximum efficiency. To supply maximum power from PV system to grid, a DC-DC boost converter is used that is controlled by P & O algorithm for maximum power point tracking. The APF system is based on a two-stage voltage source inverter that is driven by hysteresis current controller and a PI controller to extract reference current.The proposed system is simulated using MATLAB Simulink and this research reduces the total harmonic distortionof 3.83%thus increasing the overall efficiency of our proposed PV system.The proposed design with an active filter can be used in both standalone and grid connections for residential or industrial power generation..

Keywords: Active power filter; P&O algorithm; PV system; harmonic analysis

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