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RSS FeedsEnergies, Vol. 10, Pages 1067: Control Strategy for a Grid-Connected Inverter under Unbalanced Network Conditions--A Disturbance Observer-Based Decoupled Current Approach (Energies)

 
 

22 july 2017 14:15:44

 
Energies, Vol. 10, Pages 1067: Control Strategy for a Grid-Connected Inverter under Unbalanced Network Conditions--A Disturbance Observer-Based Decoupled Current Approach (Energies)
 


This paper proposes a new approach on the novel current control strategy for grid-tied voltage-source inverters (VSIs) with circumstances of asymmetrical voltage conditions. A standard grid-connected inverter (GCI) allows the degree of freedom to integrate the renewable energy system to enhance the penetration of total utility power. However, restrictive grid codes require that renewable sources connected to the grid must support stability of the grid under grid faults. Conventional synchronously rotating frame dq current controllers are insufficient under grid faults due to the low bandwidth of proportional-integral (PI) controllers. Hence, this work proposes a proportional current controller with a first-order low-pass filter disturbance observer (DOb). The proposed controller establishes independent control on positive, as well as negative, sequence current components under asymmetrical grid voltage conditions. The approach is independent of parametric component values, as it estimates nonlinear feed-forward terms with the low-pass filter DOb. A numerical simulation model of the overall power system was implemented in a MATLAB/Simulink (2014B, MathWorks, Natick, MA, USA). Further, particular results show that double-frequency active power oscillations are suppressed by injecting appropriate negative-sequence currents. Moreover, a set of simulation results provided in the article matches the developed theoretical background for its feasibility.


 
229 viewsCategory: Biophysics, Biotechnology, Physics
 
Energies, Vol. 10, Pages 1062: An Optimization Framework for Investment Evaluation of Complex Renewable Energy Systems (Energies)
Energies, Vol. 10, Pages 1065: Effects of Anisotropic Thermal Conductivity and Lorentz Force on the Flow and Heat Transfer of a Ferro-Nanofluid in a Magnetic Field (Energies)
 
 
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