Results 31 to 40 of about 798,059 (294)

INTEGRATION OF WIND FARMS INTO WEAK AC GRIDS [PDF]

, 2020
Large wind farms are usually located in remote and offshore areas. High voltage transmission systems that have long transmission distances are used to deliver the wind power to main grids. Weak AC grids have high impedance, low short circuit ratio (SCR) and/or low inertia compared to strong AC grids.
openaire   +1 more source

A Robust Method for Controlling Grid-Connected Inverters in Weak Grids

IEEE Transactions on Circuits and Systems II: Express Briefs, 2021
Stable operation of grid-connected converters with the LCL filter is essential. Variations of the grid impedance and consequently, variations of the resonance frequency, can push the system toward instability. Also, delay that comes from sampling and PWM, could worsen the stability condition.
Akhavan, Ali; id_orcid 0000-0002-9123-8844, Vasquez, Juan C.; id_orcid 0000-0001-6332-385X, Guerrero, Josep M.; id_orcid 0000-0001-5236-4592   +2 more
openaire   +2 more sources

Stability Control of Grid-Connected Converter Considering Phase-Locked Loop Frequency Coupling Effect

Energies
Given the problems that the phase-locked loop frequency coupling effect (PLL-FCE) in a weak grid reduces the quality of the output current waveform and brings challenges to maintaining a steady running of the grid-connected converter (GCC), this paper ...
Ye Zhang, Haibo Pen, Xiaoyu Zhang
doaj   +1 more source

New power decoupling strategy for grid-connected inverter under weak power grid

E3S Web of Conferences, 2018
This study analyzes the power coupling in a weak power grid, and designs a novel decoupling method for the coupling power with multi harmonic frequency on the dc bus.
Wai Rong-Jong, Wang Yu
doaj   +1 more source

A Control Parameters Design Method With Multi-Constrains for an LCL-Filtered Grid-Connected Inverter in a Weak Grid

Frontiers in Energy Research, 2022
Under weak grid conditions, the variation of the grid impedance will affect the steady-state and dynamic performance of the LCL-filtered grid-connected inverter and even make the inverter unstable.
Fuyun Wu, Zhuang Sun, Weiji Xu, Zhizhou Li, Jianguo Lyu   +4 more
doaj   +1 more source

The Cosmological Impact of Intrinsic Alignment Model Choice for Cosmic Shear [PDF]

, 2011
We consider the effect of galaxy intrinsic alignments (IAs) on dark energy constraints from weak gravitational lensing. We summarise the latest version of the linear alignment model of IAs, following the brief note of Hirata & Seljak (2010) and further ...
Anais Rassat, Bartelmann, Bernstein, Blazek, Bridle, Brown, Buergers, Catelan, Ciotti, Crittenden, Croft, Dekel, Donnacha Kirk, Doroshkevich, Eisenstein, Heavens, Heavens, Heymans, Heymans, Hirata, Hirata, Hirata, Hoekstra, Hu, Hu, Huterer, Jing, Joachimi, Joachimi, Joachimi, Kaiser, Kaiser, King, King, King, Kirk, Mackey, Mandelbaum, Munshi, Okumura, Okumura, Ole Host, Peebles, Refregier, Sarah Bridle, Schaefer, Schneider, Schrabback, Sciama, Smith, Takada, van den Bosch, van Waerbeke, White, Wittman   +54 more
core   +3 more sources

Stability enhancement control strategy for grid-connected wind power system based on composite feedforward damping

International Journal of Electrical Power & Energy Systems
The stability of grid-connected wind power system (GCWPS) is prone to deteriorate due to the impedance interaction between wind turbines and the weak grid.
Haining Wang, Zhiwei Xie, Yandong Chen, Wenhua Wu, Zhen Zhu, Jiayuan Gao   +5 more
doaj   +1 more source

Control Strategy of Vienna Rectifier With LCL Filter Under Weak Grid Conditions

发电技术, 2019
For the LCL type filter, there is a natural resonance peak, and the change of the grid impedance in the actual power grid will further affect the stability of the rectifier.
Yuanpeng FENG, Jiuhe WANG, Jianguo LI, Qiaojie ZHANG   +3 more
doaj   +1 more source

Stability Assessment of Current Controller with Harmonic Compensator for LCL-Filtered Grid-Connected Inverter under Distorted Weak Grid

Applied Sciences, 2020
An assessment of the stability and performance of current controllers with harmonic compensators is presented for an inductive-capacitive-inductive (LCL)-filtered grid-connected inverter under distorted weak grid conditions.
Seung-Jin Yoon, Thuy Vi Tran, Kyeong-Hwa Kim   +2 more
doaj   +1 more source

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