Results 101 to 110 of about 774 (188)

Performance of ROCOF relays for embedded generation applications

, 2015
The performance characteristics of rate of change of frequency (ROCOF) relays for embedded generation islanding detection are investigated. The concepts of detection-time versus power-imbalance curve and critical power imbalance are proposed.
da Silva, LCP, Xu, W, Affonso, CM, Freitas, W   +3 more
core   +1 more source

Autonomous Seamless Transition Between Grid-Connected and Islanded Operations for DC-Coupled EV Charging Infrastructures

IEEE Open Journal of the Industrial Electronics Society
This article proposes a novel seamless transition technique between grid-connected and islanded operations for DC-coupled electric vehicle (EV) charging infrastructures.
Anas Karaki, Ali Sharida, Sertac Bayhan, Haitham Abu-Rub   +3 more
doaj   +1 more source

Probabilistic Under Frequency Load Shedding Considering RoCoF Relays of Distributed Generators

, 2018
The activation of Under Frequency Load Shedding (UFLS) is the last automated action against the severe frequency drops in order to re-balance the system.
Alireza Soroudi, Darebaghi, Mohammad Ghaderi, Amraee, Turaj, Mohammad Ghaderi Darebaghi, Turaj Amraee, Andrew Keane, Keane, Andrew, Soroudi, Alireza   +7 more
core   +2 more sources

Controllability-Oriented Method to Improve Small-Signal Response of Virtual Synchronous Generators

Applied Sciences
This paper presents a method for optimizing the inertia constants and damping coefficients of interconnected virtual synchronous generators (VSGs) using a genetic algorithm.
Antonija Šumiga, Boštjan Polajžer, Jožef Ritonja, Peter Kitak   +3 more
doaj   +1 more source

Comparative analysis of VSC-HVDC converters under phase jumps, frequency change, and short-circuit faults [PDF]

Voltage source converters (VSCs) are essential for integrating renewable energy into modern power systems. VSC-HVDC systems will take part in grid-forming capabilities in the future.
Gong, Qingyuan, Zhou, Xiaoyao, Li, Chuanyue, Liang, Jun   +3 more
core   +1 more source

Step detection in power system waveforms for improved RoCoF and frequency estimation

The evaluation of the signal frequency and Rate of Change of Frequency (RoCoF) from voltage or current waveforms is used for critical grid control, monitoring and protection applications. However, when step changes in the amplitude or phase of the signal
Frigo, Guglielmo, Paolone, Mario, Karpilow, Alexandra, Derviskadic, Asja   +3 more
core   +1 more source

Synthetic inertia estimation in the presence of measurement noise and delays: An application to wind turbine generators

International Journal of Electrical Power & Energy Systems
Synthetic inertia generation is essential in power grids with high penetration of renewable energy sources (RES). The inverters interfacing the RES with the grid are equipped with dedicated controllers that set a power reference proportional to the rate ...
Valentina Baruzzi, Alessandro Rosini, Matteo Lodi, Andrea Bonfiglio, Alberto Oliveri   +4 more
doaj   +1 more source

Formulas for predicting the dynamic performance of ROCOF relays for embedded generation applications

, 2015
The paper presents a set of formulas for directly predicting the performance of rate-of-change-of-frequency (ROCOF) relays used to detect islanding of embedded synchronous generators.
Morelato, A, Huang, Z, Xu, W, Vieira, JCM, Freitas, W   +4 more
core   +1 more source

Power System Frequency Response Enhancement Using Optimal Placement and Sizing of Battery Energy Storage Systems

Energies
The increasing penetration of converter-interfaced renewable energy sources has led to reduced system inertia and increased frequency stability challenges in modern power systems.
Louwrance Ngoma, Josiah Munda, Yskandar Hamam   +2 more
doaj   +1 more source

A UFLS scheme for small isolated power systems using rate-of-change of frequency

, 2015
Artículos en revistasThis letter presents a centralized underfrequency load-shedding (UFLS) scheme using the initial rate-of-change of frequency (ROCOF) to decide whether and how much load needs to be shed.
Sigrist, Lukas
core   +1 more source