Results 81 to 90 of about 74,909 (294)
A Novel Sliding Mode Control Strategy of the Grid‐Connected Inverter Under Unbalanced Grid Voltage
IET Smart GridAs the actual grid voltage is not always balanced, the control strategy of the photovoltaic grid‐connected inverter significantly affects the quality of the current injected into the grid.
Shiqi Wang +7 more
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Advanced Science, EarlyView.Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel +3 more
wiley +1 more source
Journal of Modern Power Systems and Clean Energy, 2018 The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters (VSCs) especially in grid-connected mode.
Yang CEN, Meng HUANG, Xiaoming ZHA
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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
AIP AdvancesThis paper presents a control strategy for a grid-connected solar photovoltaic (PV) system that effectively addresses power quality issues arising from various grid conditions and load types.
Priyank Nema, Sivasankaran V
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IEEE Open Journal of Power ElectronicsThis paper evaluates the submodule capacitor current and voltage ripple of a direct three-phase to single-phase ac/ac MMC under unbalanced grid conditions.
Ygor Pereira Marca +3 more
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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
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