Results 81 to 90 of about 74,380 (202)

A mollified Ensemble Kalman filter

, 2010
It is well recognized that discontinuous analysis increments of sequential data assimilation systems, such as ensemble Kalman filters, might lead to spurious high frequency adjustment processes in the model dynamics.
Anderson, Ballabrera-Poy, Bergemann, Bloom, Burgers, Cotter, Evensen, Friedrichs, García-Archilla, Gaspari, Hamill, Hoke, Houtekamer, Houtekamer, Izaguirre, Kepert, Leimkuhler, Lorenz, Lorenz, Macpherson, Neef, Oke, Polavarapu, Salmon, Simon, Tippett, Wirosoetisno, Wirosoetisno   +27 more
core   +1 more source

Robust Tracking Control of a Three-Phase Charger under Unbalanced Grid Conditions

Energies, 2018
This paper presents a robust control technique for three-phase chargers under unbalanced grid conditions. The control method consists of inner-loop robust grid-current control and outer-loop proportional integral control for constant current (CC) and ...
Chivon Choeung, Meng Leang Kry, Young Il Lee   +2 more
doaj   +1 more source

Smart grids for rural conditions and e-mobility - Applying power routers, batteries and virtual power plants [PDF]

, 2016
Significant reductions of greenhouse gas emission by use of renewable energy sources belong to the common targets of the European Union. Smart grids address intelligent use and integration of conventional and renewable generation in combination with ...
Boehner, Volker, Franz, P., Gallart, R, Girbau Llistuella, Francesc, Hanson, J., Martínez, S., Sumper, Andreas   +6 more
core  

Control the Three-level Rectifier Under Unbalanced Grid Conditions

DEStech Transactions on Environment, Energy and Earth Sciences, 2018
This paper proposes a novel control method for Three-level rectifier under unbalanced grid conditions. An average model is established to analyze the influence of the unbalanced factor. It can be seen that the unbalanced factor will generate the negative-sequence current.
openaire   +2 more sources

Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions

Journal of Power Electronics, 2015
High voltage direct current transmission based on modular multilevel converter (MMC-HVDC) is one of the most promising power transmission technologies. In this study, the mathematical characteristics of MMC-HVDC are analyzed in a synchronous rotational reference frame.
Jianpo Zhang, Chengyong Zhao
openaire   +2 more sources

Improving the Performance of Low Voltage Networks by an Optimized Unbalance Operation of Three-Phase Distributed Generators [PDF]

, 2019
This work focuses on using the full potential of PV inverters in order to improve the efficiency of low voltage networks. More specifically, the independent per-phase control capability of PV three-phase four-wire inverters, which are able to inject ...
Gastalver Rubio, Adolfo, Maza Ortega, José María, Romero Ramos, Esther   +2 more
core  

Performance Improvement of Model‐Free Predictive Current Control for PWM Rectifiers Under Nonideal Power Grids

IET Power Electronics
This paper proposes an improved robust predictive current control strategy, combining an improved ultralocal model with a hybrid space vector modulation (HSVM) scheme.
Xing Wang, Yongchang Zhang, Dian Cao, Lei Han   +3 more
doaj   +1 more source

A Weighted Control Strategy Based on Current Imbalance Degree for Vienna Rectifiers Under Unbalanced Grid

Machines
Under unbalanced grid conditions, the three-phase Vienna rectifier exhibits significant voltage fluctuations in dc-link and asymmetric input currents. Traditional control methods cannot simultaneously suppress the voltage ripples in dc-link and balance ...
Haigang Wang, Zongwei Liu, Muqin Tian
doaj   +1 more source

Hybrid vector modulated model predictive control of bidirectional voltage source converter under unbalanced grid voltages

Systems Science & Control Engineering
For the power control problem of a bidirectional voltage-source converter, because only one voltage vector is applied at each control period, the traditional model predictive direct power control strategy brings in high harmonic content. In this paper, a
Zhichao Zhao, Licheng Wang, Jin Xiong, Zahoor Ahmed   +3 more
doaj   +1 more source

Power quality and electromagnetic compatibility: special report, session 2 [PDF]

, 2015
The scope of Session 2 (S2) has been defined as follows by the Session Advisory Group and the Technical Committee: Power Quality (PQ), with the more general concept of electromagnetic compatibility (EMC) and with some related safety problems in ...
Desmet, Jan, Heimbach, Britta, Renner, Herwig   +2 more
core   +1 more source