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This paper presents an approach to include the third harmonic injection into a Three-Phase, Three-Wire Voltage Sourced Inverter (VSI) operating with sliding mode control. First, independent phase currents are controlled to deliver the primary source power to the grid. Since only two phase current have been controlled, an extra degree of freedom can be employed to include the third harmonic injection...
Ancillary services for distributed generation (DG) systems become a challenging issue to smartly integrate renewable-energy sources into the grid. Voltage control is one of these ancillary services which can ride through and support the voltage under grid faults. Grid codes from the transmission system operators describe the behavior of the energy source, regulating voltage limits and reactive power...
Grid faults are one of the most severe perturbations to deal with in grid connected systems. To support the grid under voltage-sags (dips), different reactive power control strategies are needed depending on the type of grid fault. One of the possible objectives when supporting the grid voltage under type C voltage sags could be to avoid undervoltage in the faulted phases and over-voltage in the non-faulted...
Unbalanced voltage sags strongly deteriorate the performance of power converters and electrical machines connected to the distribution network. In particular, a reduction of the power quality is noticed in these equipments, which is caused by a ripple in the output power and an increase of the current harmonic distortion. Several solutions based on reactive power compensation have been introduced...
This paper proposes a new structure for grid synchronization based on generalized integrators (GI) that lead to fast detection of positive and negative components of the grid voltage. The GI are used as a band pass filter (GI-BPF) mainly to provide in-phase and quadrature components of grid voltage. The proposed structure consists in the cascaded connection of multiple GI-BPF to achieve a faster time...
A Voltage Sourced Inverter (VSI) intended to inject active power to the grid is presented. The VSI is designed with an LCL output filter. This objective is done by means of a sliding mode control, which is a widely used technique to control systems where a fast dynamic response, robustness and accuracy are required. However, variable switching frequency appears when the sliding mode control is implemented...
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