Results 51 to 60 of about 441,873 (190)

Modeling of Double Stage Photovoltaic Inverter System with Fast Delayed Signal Cancellation for Fault Ride-Through Control Application in Microgrids

Energies, 2022
This research presents a secondary control for a grid-supporting microgrid with photovoltaics sources to guarantee grid code compliance and ancillary services.
Elutunji Buraimoh, Innocent E. Davidson
doaj   +1 more source

A Zero-Sequence Current-Based Cluster Energy Balancing Control in Single-Star Multilevel Converter With Zigzag Transformer

IEEE Access
In a power system, when a fault occurs, a Static Synchronous Compensator (STATCOM) is often required to inject negative-sequence current to compensate for unbalanced conditions. In high-voltage applications, single-star multilevel converters are commonly
Yeongung Kim, Shenghui Cui, Jae-Jung Jung   +2 more
doaj   +1 more source

Study of Asymmetries in 0.4 kV Distribution Line with Different Schemes of Supply Transformers and Connection of Single-phase Renewable Energy Source [PDF]

Problems of the Regional Energetics
The aim of the work is studying asymmetric modes of 10/0.4 kV distribution transformers at connecting single-phase renewable energy sources. This problem is relevant due to increasingly use of such sources. To achieve this goal, calculation of asymmetric
Bosneaga V., Suslov V.
doaj   +1 more source

Laboratory simulations of astrophysical jets and solar coronal loops: new results [PDF]

, 2010
An experimental program underway at Caltech has produced plasmas where the shape is neither fixed by the vacuum chamber nor fixed by an external coil set, but instead is determined by self-organization.
Bellan, P. M., Kumar, D., Moser, A. L., Stenson, E. V., Tripathi, S. K. P., Yun, G. S.   +5 more
core   +1 more source

Improvements on a Sensorless Scheme for a Surface-Mounted Permanent Magnet Synchronous Motor Using Very Low Voltage Injection

Energies, 2020
Sensorless control of electrical drives is still a difficult task, especially in the lower speed region. Moreover, when the machine has a low saliency such as in the case of Surface Mounted Permanent Magnet Synchronous Motor (SMPMSM), high frequency ...
Jaime Pando-Acedo, Enrique Romero-Cadaval, Maria Isabel Milanes-Montero, Fermin Barrero-Gonzalez   +3 more
doaj   +1 more source

Research on flexible uninterrupted neutral section passing system based on V-clamp multilevel converter

Energy Reports, 2023
This paper proposes a novel flexible uninterrupted neutral section passing system based on four-leg V-clamp multilevel converter (VMC). It can better solve a series of problems such as overvoltage, overcurrent and speed loss caused by the interruptible ...
Jiawei Guo, Kai Li, Trillion Q. Zheng, Chenchen Wang, Xiaojie You   +4 more
doaj   +1 more source

A novel method for the injection and manipulation of magnetic charge states in nanostructures [PDF]

, 2016
Realising the promise of next-generation magnetic nanotechnologies is contingent on the development of novel methods for controlling magnetic states at the nanoscale.
Branford, W. R., Burn, D. M., Cohen, L. F., Gartside, J. C.   +3 more
core   +2 more sources

Equivalent Grid Impedance Estimation Method Using Negative Sequence Current Injection in Three-Phase Grid-connected Inverter

The Transactions of the Korean Institute of Power Electronics, 2015
A new algorithm is proposed for the estimation of equivalent grid impedance at the point of common coupling of a grid-tie inverter output. The estimated impedance parameter can be used for the improvement of the performance and the stability of the distributed generation system.
Chan-Sol Park, Seung-Ho Song, Ji-Hoon Im
openaire   +2 more sources

Motion and equilibrium of a spheromak in a toroidal flux conserver [PDF]

, 1991
A number of experiments have been performed on spheromaks injected into the empty vacuum vessel of the Caltech ENCORE tokamak (i.e., without tokamak plasma) [Phys. Rev. Lett. 64, 2144 (1990); Phys. Fluids B 2, 1306 (1990)].
Bellan, P. M., Brown, M. R., Cutrer, D. M.   +2 more
core   +1 more source

An Adaptive Reclosing Scheme for Cross-Line Faults on Double-Circuit Wind Power Outgoing Lines with Shunt Reactors

Energies
Wind turbines are vulnerable to negative sequence current injection, the conventional automatic reclosing scheme for wind power outgoing lines, since we may inject negative sequence components into the system and reclose it without distinguishing the ...
Sen Hu, Chao Xie, Chunya Yin
doaj   +1 more source