Results 21 to 30 of about 4,684 (264)

Stability analysis of different control modes of grid-connected converters under different grid conditions

Frontiers in Energy Research, 2023
With the sustained popularity of renewable energy generation, high penetration of variable energies, e.g., wind and solar, is reshaping the form of power systems and weakening the strength of the grid.
Zhi Xu, Zhi Xu, Yanhui Qin, Yanhui Qin, Zian Li, Zian Li, Chunlei Jiao, Chunlei Jiao, Baoyu Zhai, Baoyu Zhai, Xiqiang Chang   +10 more
doaj   +1 more source

Doubly Fed Induction Generator System Resonance Active Damping through Stator Virtual Impedance [PDF]

, 2017
The penetration of wind power has been increasing in the past few decades all over the world. Under certain non-ideal situations where the wind power generation system is connected to the weak grid, the Doubly Fed Induction Generator (DFIG) based wind ...
Blaabjerg, Frede, Song, Yipeng, Wang, Xiongfei   +2 more
core   +2 more sources

Robust Control and Optimization Method for Single-Phase Grid-Connected Inverters Based on All-Pass-Filter Phase-Locked Loop in Weak Grid

Energies, 2022
In a distributed generation system, the all-pass-filter phase-locked loop (APF-PLL) is a commonly used method for grid synchronization. However, the coupling effect between APF-PLL and current control loop increases the risk of oscillation instability ...
Longyue Yang, Tian Cao, Huapeng Chen, Xinwei Dong, Shuyuan Zhang   +4 more
doaj   +1 more source

Spectral theory of a Neumann-Poincar\'e-type operator and analysis of anomalous localized resonance II [PDF]

, 2012
If a body of dielectric material is coated by a plasmonic structure of negative dielectric constant with nonzero loss parameter, then cloaking by anomalous localized resonance (CALR) may occur as the loss parameter tends to zero. The aim of this paper is
Ammari, Habib, Ciraolo, Giulio, Kang, Hyeonbae, Lee, Hyundae, Milton, Graeme W.   +4 more
core   +2 more sources

Suppression Strategy of Sub/Super-synchronous Oscillations in Doubly-Fed Wind Farm Based on SVG Additional Current Feedback Impedance Reshaping

Zhongguo dianli
Doubly-fed wind farm often interacts with the power grid, leading to sub/super-synchronous oscillations. To address the issue of limited adaptability in suppressing these oscillations using impedance reshaping methods, this paper proposes an impedance ...
Zejia WANG, Minxiao HAN, Yiwen FAN
doaj   +1 more source

Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions

Energies, 2018
With plenty of parallel inverters connected to a weak grid at the point of common coupling (PCC), the impedance coupling interactions between the inverters and the grid are enhanced, which may cause high-frequency harmonic oscillation and further ...
Ling Yang, Yandong Chen, Hongliang Wang, An Luo, Kunshan Huai   +4 more
doaj   +1 more source

A grid voltage perturbations based bidirectional impedance uniform control for grid‐connected DC/AC converter

IET Renewable Power Generation, 2023
For bidirectional grid‐connected DC/AC converters, the power flow variation substantially alters the system stability, and especially severs under heavy load. Towards this problem, this paper proposes a novel impedance uniform control method to eliminate
Li Liu, Yu Ding, Fei Peng, Yanjun Tian, Kun Wang, Zhe Chen   +5 more
doaj   +1 more source

Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow

Energies, 2022
Considering the bidirectional three-phase DC/AC converter, it presents different impedance characteristics on AC side under different power flow directions, resulting in different stability margin.
Li Liu, Kun Wang, Fei Peng, Yanjun Tian, Yi Wang   +4 more
doaj   +1 more source

Kinetic Inductance and Penetration Depth of Thin Superconducting Films Measured by THz Pulse Spectroscopy

, 1993
We measure the transmission of THz pulses through thin films of YBCO at temperatures between 10K and 300K. The pulses possess a useable bandwidth extending from 0.1 -- 1.5 THz (3.3 cm^-1 -- 50 cm^-1).
A. C. Campbell, A. M. Neminsky, A. P. Litvinchuk, B. Mühlschlegel, C. J. Gorter, D. A. Bonn, D. E. Aspnes, D. Grischkowsky, H. U. Habermeier, H.-U. Habermeier, I. E. Trofimov, J. Annett, J. Halbritter, J. Kuhl, J. Lee, J. O. White, J. R. Schrieffer, M. C. Nuss, M. R. Beasley, M. Y. Frankel, N. Klein, P. Arberg, R. Buhleier, S. D. Brorson, S. M. Anlage, W. N. Hardy, Z. Ma   +26 more
core   +2 more sources

Current coordinated distribution and voltage optimization control for multi-VSGs system considering nonlinear and negative sequence loads

Frontiers in Energy Research
In a microgrid system where multiple virtual synchronous generators (VSGs) are interconnected through high impedance cables, the total output negative sequence and harmonic current of multiple VSGs cannot be coordinated based on the capacity of each ...
Luyao Xie, Yu Zhang, Youbing Zhang, Yi Chen, Bo Wang   +4 more
doaj   +1 more source