Results 211 to 220 of about 4,441 (266)

[Regular inspections of hospitals by the public health service: nationwide representative data collection on structure, organization, and content in Germany]. [PDF]

Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz
Dornaika A, Dannenberg J, Droop F, Engelhart S, Mutters NT, Wollkopf AD, PRO-OEGD study group.   +6 more
europepmc   +1 more source

Intravascular lithotripsy followed by angioplasty and stenting for severely calcified carotid artery stenosis: technical note and case series. [PDF]

Front Neurol
Mitchell M, Verhey LH, Taylor N, Sewell A, Orozco AR, Mazaris P.   +5 more
europepmc   +1 more source

Prolonged early postoperative adduction restriction is significantly associated with shoulder stiffness 1 year after arthroscopic rotator cuff repair. [PDF]

JSES Int
Miyasaka Y, Sekiguchi T, Takahashi N, Nagaoka T, Kimura K, Matsuda K, Matsuki K, Hoshika S, Sugaya H, Kawashima I.   +9 more
europepmc   +1 more source

Decentralized active fault tolerant control of direct current microgrids under actuator and source disturbances using proportional integral unknown input observer. [PDF]

Sci Rep
Ouahabi MS, Barkat S, Benyounes A, Rekioua T, Ihammouchen S, Benbouhenni H, Elbarbary ZMS, Alammar MM.   +7 more
europepmc   +1 more source

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Filter Deballasting Control of Droop-Controlled Inverters

IEEE Transactions on Power Electronics, 2021
In microgrids with droop-controlled inverters, the supervisory controller must the tune the droop gains in real time to maintain stability as the system topology or the number of inverters change. Stability could be compromised due to delays in the dispatch of supervisory control inputs or due to communication link failures.
Gurupraanesh Raman, Jimmy Chih-Hsien Peng   +1 more
openaire   +1 more source

Educational Droop Control Laboratory Setup

2021 International Conference on Electrical, Computer, Communications and Mechatronics Engineering (ICECCME), 2021
Power congestion management problems can be solved with droop control in DC microgrids. This requires a grid controller capable of controlling current. An extension has been made for a universal half-bridge educational power electronics trainer called the Universal Four Leg, for application as a grid manager in 48V DC micro-grids.
Holly T. Engelbrecht, Diego C. Zuidervliet, Peter J. van Duijsen   +2 more
openaire   +1 more source

Virtual Oscillator Control subsumes droop control

2015 American Control Conference (ACC), 2015
In this paper we examine the amplitude and phase dynamics of power-electronic inverters in islanded microgrids that are controlled to emulate the dynamics of a class of weakly nonlinear Lienard-type oscillators. The general strategy of controlling inverters to emulate the behavior of Lienard-type oscillators is termed Virtual Oscillator Control (VOC ...
Mohit Sinha, Florian Dorfler, Brian B. Johnson, Sairaj V. Dhople   +3 more
openaire   +1 more source

Comparison of Performances between Angle Droop Control and Frequency Droop Control in Microgrids

2019 IEEE 3rd International Electrical and Energy Conference (CIEEC), 2019
Compared with frequency droop control, angle droop control avoids frequency deviation, but it is hard to share active power exactly among distributed generations (DGs). Although this defect can be solved by secondary control, frequency droop control also has a similar way to eliminate frequency deviation.
Weiqiang Yao, Wei Bao, Yin Xu, Sijia Wang, Xiangyu Wu, Shanshan Shi   +5 more
openaire   +1 more source

Dynamics of droop-controlled microgrids with unequal droop response times

2013 Australasian Universities Power Engineering Conference (AUPEC), 2013
One increasingly popular approach to integrate distributed generation (DG) energy sources into an electrical grid system, is to assemble them into microgrids which then connect to the main utility grid at a single or multiple points of connection. A microgrid can also operate as a standalone islanded network which is physically disconnected from the ...
B. Shoeiby, D. G. Holmes, B. P. McGrath, R. Davoodnezhad   +3 more
openaire   +1 more source

Decoupled droop control of inverters

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
This article first reviews the droop control method for inverters participating in low voltage microgrids, discussing static and dynamic response. Then the paper proposes a droop controller that brings independent actuation of frequency over active power and voltage over reactive power.
Jeronimo Quesada, Jose Antonio Sainz, Rafael Sebastian, Manuel Castro   +3 more
openaire   +1 more source