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Unbalanced Circulating Current of Double-Circuit Transmission Lines
2011 Asia-Pacific Power and Energy Engineering Conference, 2011Double-circuit transmission lines and even multi circuit transmission lines are trends for development of power system. The paper analyzes the wire layouts of double-circuit line and characteristics of its impedance matrix. And then the sequence currents of double-circuit line are investigated.
Bin Li, Xuebin Li, Zhiqian Bo
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Circulating Current Suppression for MMC-HVDC under Unbalanced Grid Conditions
IEEE Transactions on Industry Applications, 2016Modular multilevel converter (MMC) is believed the most competitive solution for high-voltage direct current (HVDC) transmission using voltage source converters. Circulating current suppressing strategies based on proportional resonant (PR) controllers are widely used in MMC. This kind of strategies can effectively eliminate all the circulating current
Jinyu Wang +3 more
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Currents and voltages of a three-phase unbalanced load
Electrical Engineering, 1940In the computation of the phase voltages and currents of an unbalanced three-phase wye load, the electrical engineer usually employs one of several generally accepted methods.
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Analysis of the inner unbalanced current for modular multilevel converter
2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2018Circulating components of the inner unbalanced current for modular multilevel converter will increase the power loss of the converter and reduce the utilization of the bridge arm capacities inevitably. Even worse, the distortion of the bridge arm current will be intensified, which will endanger the safe operation of the system.
Jie Liu +4 more
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Development of an unbalanced switching scheme for a current source inverter
IEE Proceedings - Generation, Transmission and Distribution, 2000The development of an unbalanced switching scheme for the power conditioning system of a superconducting magnetic energy storage (SMES) device is described. The pulse-width modulation switching scheme for a current-source inverter, based on the unified switching algorithm, is presented.
H.C. Tay, M.F. Conlon
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Current-voltage characteristics of unbalanced superconducting Wheatstone bridges
Journal of Applied Physics, 1995We compute the current-voltage characteristics of unbalanced superconducting Wheatstone bridges biased with constant and radio frequency current sources. An analytical expression for the critical supercurrent at which a nonzero voltage appears across the transverse junction of the bridge is derived.
M. Cahay, G. Qian, R. Kothari
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Wind Turbine Harmonics caused by Unbalanced Grid Currents
2007 Compatibility in Power Electronics, 2007For wind turbines that feed into public grids limits for voltage and current harmonics must be assured. To verify that the actual levels are valid, measurements are necessary. Problems can occur to determine which part of these harmonics has its origin in the wind turbine.
Klaus-Dieter Dettmann +2 more
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Direct current machines control in unbalanced AC networks
IV IEEE International Power Electronics Congress. Technical Proceedings. CIEP 95, 2002This work presents the results and the methodology used for simulation of DC machines operating in an unbalanced electrical network, where it is expected that the representation of the AC power supply network involves cables, utility equivalent transformer, converter bridges, representation of the DC machine, and representation of the control and ...
J.R. Cogo, J. Souza de Sa
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Failure identification of induction motors by sensing unbalanced stator currents
IEEE Transactions on Energy Conversion, 1989The maintenance of electric drives is essential to their efficient and safe operation in any industry. The lack of an effectively designed and implemented maintenance policy will result in increased downtime, increased capital losses from catastrophic failures, and in some cases, a reduced level of personnel safety.
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Analysis on the unbalanced loop current of the traction power supply
2013 5th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2013Harassment traction loop current along the rail causes interference to track circuit of communication directly. With the increasing of train speed and capacity, the loop current becomes stronger and stronger, hence, conductive interference by unbalanced loop current is more serious.
Shi Xiao +3 more
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