Results 171 to 180 of about 3,398 (227)
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Overvoltage suppression filter design methods based on voltage reflection theory
IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03., 2003To reduce voltage overshoot at the motor terminal, RLC filters are used at the inverter side with an objective of increasing the rise time, while RC filters are used at the motor side as a means of reducing the load impedance at high frequency. However, no clear optimal method for determining the filter parameters has appeared. In this work, we propose
Lee, S, Nam, K
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Overvoltages in reactive circuits due to current suppression
Electric Power Systems Research, 1991Abstract Serious overvoltages may be generated by current suppression (or current chopping) when switching out shunt reactors or unloaded transformers. Normalized overvoltage profiles are determined using (a) a single concentrated resistor and (b) a distributed resistance network to simulate eddy current loss in the magnetic core.
D. O'Kelly, A.R.M. Salih, B. Benson
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A low-loss motor terminal filter for overvoltage suppression
2010 IEEE Energy Conversion Congress and Exposition, 2010Inverter-fed motor drive systems are widely used because of their benefits for energy efficiency and for flexible control of machinery using maintenance-free induction motors. As the inverter produces fast-switching voltage pulses, the transmission-line effects of the motor cable and motor stator windings become significant, and may lead to a doubling ...
Kuen-Faat Yuen, Henry Shu-Hung Chung
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Study on Submarine Cable Overvoltage Impact Test Suppression Measures
2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC), 2018Submarine cable capacitance effect is obvious, AC submarine cable connect to the grid by the offshore wind farm and onshore wind farm reactive voltage distribution characteristics, there are significant differences in fault characteristics, more prone to overvoltage problems, may damage the cable insulation failure.
Lei Zhang +5 more
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Application of Superconductors to Suppress Ferroresonance Overvoltage in DFIG-WECS
IEEE Transactions on Energy Conversion, 2022While much attention was given in the literature to improve the fault ride through (FRT) capability of a doubly-fed induction generator (DFIG)-based wind energy conversion system (WECS) during various faults at the grid side, not much attention was given to investigate and improve the performance of DFIG-WECS under ferroresonance conditions. This paper
Mohamed Mosaad +3 more
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2018 China International Conference on Electricity Distribution (CICED), 2018
Neutral displacement overvoltage is harmful to power equipment. A method for suppressing the neutral point displacement overvoltage and its suppression circuit were proposed in this paper to restore it to a normal level. First, it is judged if the neutral point displacement voltage is greater than the set value.
Liu Kai +7 more
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Neutral displacement overvoltage is harmful to power equipment. A method for suppressing the neutral point displacement overvoltage and its suppression circuit were proposed in this paper to restore it to a normal level. First, it is judged if the neutral point displacement voltage is greater than the set value.
Liu Kai +7 more
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Suppression of Transient Overvoltages on Instrumentation Wiring Systems
IEEE Transactions on Industry Applications, 1985Modern electronic analog instrumentation equipment is vulnerable to damage by transient overvoltages appearing on signal and power supply wiring. Experience with overvoltages and relatively simple techniques to avoid damage are discussed.
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Suppression of Fast Transient Overvoltage During Gas Disconnector Switching in GIS
IEEE Power Engineering Review, 1986This paper describes the suppression of the transient overvoltage caused by gas disconnector switching of a small capacitive charging current in a gas insulated switchgear substation. The overvoltage is suppressed by the insertion of a resistor with an appropriate value during the switching. A scale model gas disconnector with the resistor is developed.
J. Ozawa +4 more
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Lightning overvoltage suppression to UHV power transformer by ferromagnetic ring
Electric Power Systems Research, 2013Abstract Lightning overvoltage protection is of great importance to the safety of devices in UHV GIS. In practice, insulation failure of UHV transformer due to lightning strike is often reported. The widely used UHV metal-oxide arresters can suppress the magnitude of lightning overvoltage but lack effectiveness on alleviating the steepness.
Xiao Zhang, Jinliang He
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A hybrid active filter implementation of an overvoltage suppression scheme
2004 IEEE International Symposium on Industrial Electronics, 2004In several practical applications actuators are interconnected to a controlled plant through long cables. If the actuator operates at a fast sampling rate (with respect to the propagation delay of the cable) and its impedance cannot be neglected, wave reflections occur and the transmitted pulse are deformed-degrading the control quality.
R. Ortega +3 more
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