Results 71 to 80 of about 74,380 (202)

Tradeoffs between AC power quality and DC bus ripple for 3-phase 3-wire inverter-connected devices within microgrids [PDF]

, 2011
Visions of future power systems contain high penetrations of inverters which are used to convert power from dc (direct current) to ac (alternating current) or vice versa.
Burt, Graeme M., Finney, Stephen J., Roscoe, Andrew J.   +2 more
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, Luna Alloza, Álvaro, Rodríguez Cortés, Pedro, Undeland, Tore   +3 more
openaire   +2 more sources

ADALINE generalized integrator based control to mitigate the power quality issues in grid connected solar PV systems

AIP Advances
This 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
doaj   +1 more source

Impact of Unbalanced Grid Voltages on Capacitor Voltage Ripple and Capacitance Selection in AC/AC MMCs

IEEE Open Journal of Power Electronics
This 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, Maurice G. L. Roes, Cornelis G. E. Wijnands, Henk Huisman   +3 more
doaj   +1 more source

Decoupled Double Synchronous Reference Frame current controller for unbalanced grid voltage conditions

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, Rodríguez Cortés, Pedro, Vazques, Sergio, Luna Alloza, Álvaro, Carrasco, Juan Manuel, Teodorescu, Remus   +5 more
openaire   +3 more sources

Comparison of 2D grid simulations for flow past cylinder at high Reynolds numbers [PDF]

, 2019
The paper focuses on the verification of the suitability of the SST k - omega model on the flow past a circular cylinder in 2D for a high Reynolds number.
Kološ, Ivan, Lausová, Lenka, Michalcová, Vladimíra   +2 more
core   +1 more source

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, Ting Ding, Hengxin He, Xia Chen, Fengbo Tao, Zhicheng Zhou, Yang Xu, Shu Chen   +7 more
openaire   +1 more source

A Virtual Synchronous Generator Low-Voltage Ride-Through Control Strategy Considering Complex Grid Faults

Applied Sciences
The Virtual Synchronous Generator (VSG) control strategy has garnered widespread application during the low-voltage ride-through (LVRT) of distributed energy resources integrated into power grids, primarily due to its inertia and damping properties ...
Jun Yin, Ziang Chen, Weichen Qian, Shengyu Zhou   +3 more
doaj   +1 more source

Finite Control Set Model Predictive Control for an LCL-Filtered Grid-Tied Inverter with Full Status Estimations under Unbalanced Grid Voltage

Energies, 2019
This paper proposes a novel finite control set model predictive control (FCS-MPC) strategy with merely grid-injected current sensors for an inductance-capacitance-inductance (LCL)-filtered grid-tied inverter, which can obtain a sinusoidal grid-injected ...
Xiaotao Chen, Weimin Wu, Ning Gao, Jiahao Liu, Henry Shu-Hung Chung, Frede Blaabjerg   +5 more
doaj   +1 more source

Control Approach of Grid-Connected PV Inverter under Unbalanced Grid Conditions

Processes
In grid-connected photovoltaic (PV) systems, power quality and voltage control are necessary, particularly under unbalanced grid conditions. These conditions frequently lead to double-line frequency power oscillations, which worsen Direct Current (DC)-link voltage ripples and stress DC-link capacitors.
openaire   +1 more source