Results 91 to 100 of about 13,079 (253)

Control of Three-phase Four-leg Micro-grid Inverter in Islanding Mode

Kongzhi Yu Xinxi Jishu, 2013
Off-grid operation is one of the significant characteristics of micro-grid. In off-grid mode, unbalanced loads will cause voltage unbalance and degrade the performance of micro-grid.
TAN Lanlan
doaj  

Research on the Influence of Power Grid on the Operation of Voltage Source Inverter

Kongzhi Yu Xinxi Jishu, 2017
Three-phase input current unbalance is often happened in inverters, which causes devices damaged by overvoltage or over-current. Influences of grid unbalance, line impedance and multi-load on voltage source inverter and their mechanisms were analyzed ...
WANG Lucheng, HE Donglin, ZHANG Fengjiang   +2 more
doaj  

Power conditioning using dynamic voltage restorers under different voltage sag types

Journal of Advanced Research, 2016
Voltage sags can be symmetrical or unsymmetrical depending on the causes of the sag. At the present time, one of the most common procedures for mitigating voltage sags is by the use of dynamic voltage restorers (DVRs).
Ahmed M. Saeed, Shady H.E. Abdel Aleem, Ahmed M. Ibrahim, Murat E. Balci, Essam E.A. El-Zahab   +4 more
doaj   +1 more source

The Performance of a Three-Phase Induction Motor under and over Unbalance Voltage

Tikrit Journal of Engineering Sciences, 2022
Voltage unbalance is an adverse global phenomenon impacting three-phase induction motor output. Three-phase source voltage may become imbalanced in a variety of respects, while a balanced system preserves stable voltage magnitude and angles in three ...
Abdulsatar H. Jassim, Arkan A. Hussein, Laith F. Abbas   +2 more
doaj  

A Novel Phase-Locked Loop With Improved-Dual Adaptive Notch Filter and Multi-Variable Filter

IEEE Access, 2019
In the control of grid-connected power inverters, the frequency and amplitude information of fundamental positive-sequence component of grid voltage need to be obtained quickly and accurately, especially when the grid voltage is imbalance, harmonic ...
Hongbin Pan, Zhen Li, Tianyang Wei
doaj   +1 more source

PMU-Based ROCOF Measurements: Uncertainty Limits and Metrological Significance in Power System Applications

, 2019
In modern power systems, the Rate-of-Change-of-Frequency (ROCOF) may be largely employed in Wide Area Monitoring, Protection and Control (WAMPAC) applications. However, a standard approach towards ROCOF measurements is still missing.
Derviskadic, Asja, Frigo, Guglielmo, Paolone, Mario, Zuo, Yihui   +3 more
core   +1 more source

Voltage Unbalance Control Strategy for Local Shading Photovoltaic Grid-Connected System

Energies
In view of the sudden grid voltage distortions, such as voltage sags and unbalances, that may occur in photovoltaic (PV) grid-connected systems under local shading conditions, this paper proposes a control strategy integrating a linear active disturbance rejection controller (LADRC)-based virtual synchronous generator (VSG) and an active disturbance ...
Pingye Wan, Miao Huang, Jinshan Mou, Lili Tao, Shuping Zhang, Zhihua Hu   +5 more
openaire   +2 more sources

Random Generation of Arbitrary Waveforms for Emulating Three-Phase Systems [PDF]

, 2011
This paper describes an apparatus for generating a signal representative of steady-state and transient disturbances in three-phase waveforms of an ac electrical system as described in IEEE Std 1159-09.
García Delgado, Antonio, León de Mora, Carlos, López Ojeda, Antonio, Monedero Goicoechea, Iñigo Luis, Montaño Asquerino, Juan-Carlos, Personal Vázquez, Enrique   +5 more
core  

Performance enhancement of grid-forming inverter-controlled PV systems: A comparative study with and without battery energy storage under intermittent and unbalanced load conditions

Results in Engineering
The integration of renewable energy provides an alternative solution for transitioning to sustainable energy sources. However, differences in characteristics between renewable energy systems and the grid create challenges during integration. Grid-Forming
Muhammad Akbar Syahbani, Makbul Anwari Muhammad Ramli, Prisma Megantoro, Alfananda Ardiansyah, Intan Dwi Cahyani, Noer Fadzri Perdana Dinata, Rifqi Firmansyah, Muhammad Zohri, Firmansyah Nur Budiman   +8 more
doaj   +1 more source

Phase-to-phase power balance control in flexible interconnection equipment by injecting zero sequence voltage

Xi'an Gongcheng Daxue xuebao
The multi terminal flexible interconnection equipment with cascaded full bridge and dual active bridge structure could connect AC power grid and multiple DC power grid, and instantaneous power differences in different DC power grids and sub module faults
WANG Bo, JI Ziyue, WANG Wanxing, XIAO Chaomin, ZHANG Yan   +4 more
doaj   +1 more source