Results 81 to 90 of about 57,788 (289)
A new model for the substorm growth phase [PDF]
, 2014 Thesis (Ph.D.) University of Alaska Fairbanks, 2014.The physics of geomagnetic substorms has been under debate for a long time. In particular, the formation of a thin current sheet (CS) is a central unresolved problem because it provides the magnetotail ...
Hsieh, Min-Shiu, 謝旻秀
core
On the Properties of the Compound Nodal Admittance Matrix of Polyphase Power Systems
, 2018 Most techniques for power system analysis model the grid by exact electrical circuits. For instance, in power flow study, state estimation, and voltage stability assessment, the use of admittance parameters (i.e., the nodal admittance matrix) and hybrid ...
Kettner, Andreas Martin, Paolone, Mario
core +1 more source
Frequency-adaptive Virtual Flux estimation for grid synchronization under unbalanced conditions
IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society, 2010 This paper proposes a new and explicitly frequencyadaptive method for Virtual Flux estimation and voltage sensorless grid synchronization under unbalanced conditions. The proposed system is based on using Second Order Generalized Integrators, arranged to simultaneously fulfill the purposes of frequency-adaptive band-pass ...
Suul, Jon Are +3 more
openaire +2 more sources
Mapping the “Supply–Demand–Flow” of Ecosystem Services for Ecosystem Management in China
Advanced Science, EarlyView.This study develops a “supply–demand–flow” framework clarifies how ecosystem services move between regions by distinguishing potential and actual supply and demand. Using integrated biophysical–socioeconomic modeling, nine services in China were mapped.
Yikun Zhang +3 more
wiley +1 more source
Voltage-Sensorless Control Scheme for a Grid Connected Inverter Using Disturbance Observer
Energies, 2017 A grid connected inverter usually requires voltage and current measurements to control the active and reactive powers as well as the inverter output currents.
Hyun-Sou Kim, Kyeong-Hwa Kim
doaj +1 more source
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012 Due to the growing changes in the electrical network related to the new distributed generation scheme and the integration of renewable energy sources, new requirements for grid-connected power converters are being defined in the new grid codes. The injection of positive- and negativesequence current components is becoming necessary for achieving new ...
Reyes, Manuel +5 more
openaire +3 more sources
The Importance of Metal‐Organic Framework Linker Atoms for CO2 Reduction: A DFT Study
Advanced Science, EarlyView.Using DFT, we examine the role of linker atoms in CO2 reduction on copper‐based metal organic frameworks (Cu MOFs). Our calculations reveal that linker atoms may serve as both CO2 and H‐shuttling sites and suggest linker electrostatics as a descriptor for linker activity. ABSTRACT Although the metal within the secondary building unit of a metal‐organic
Ugochukwu Nwosu, Samira Siahrostami
wiley +1 more source
Advanced Science, EarlyView.Glaucoma, a major cause of blindness, involves retinal ganglion cell (RGC) degeneration. This study shows growth hormone‐releasing hormone receptor (GHRHR) deficiency preserves RGC survival and restores vision, unlike activation which only aids survival.
Yan Tong +24 more
wiley +1 more source
Vector and Matrix Optimal Mass Transport: Theory, Algorithm, and Applications
, 2018 In many applications such as color image processing, data has more than one piece of information associated with each spatial coordinate, and in such cases the classical optimal mass transport (OMT) must be generalized to handle vector-valued or matrix ...
Chen, Yongxin +3 more
core +3 more sources
Model predictive control of MMC-UPFC under unbalanced grid conditions
International Journal of Electrical Power & Energy Systems, 2020 Abstract This paper proposes a model predictive control (MPC) method to tackle the power flow control of the modular multilevel converter based unified power flow controller (MMC-UPFC) under unbalanced grid conditions. The predictive models corresponding to the discrete-time models of MMC-UPFC are derived.
Qiufan Yang +7 more
openaire +1 more source