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This paper proposes a novel control strategy for the two-stage three-phase Photovoltaic (PV) systems to improve the operation under unbalanced grid faults. In case that a three-phase power converter operates under unbalanced grid voltage faults, power related issues, including injected currents, active and reactive power can be negatively affected. In grid-connected systems, the unbalanced faults...
Unbalanced grid voltage dips may lead to unbalanced non-sinusoidal current injections, dc-link voltage oscillations, and active and/or reactive power oscillations with twice the grid fundamental frequency in three-phase grid-connected Photovoltaic (PV) systems. Double grid frequency oscillations at the dc-link of the conventional two-stage PV inverters can further deteriorate the dc-link capacitor,...
Nowadays, grid faults consist anxious problem for grid inverters controller design. Conventional controllers are based on linear regulators such as PI and PR. This paper proposes a model predictive algorithm based on PNSC reference generation method to control the 3L-NPC inverter under grid voltage sags. The novel algorithm allows the easy inclusion of system nonlinearities, thus no additional fine...
In this paper, a novel reverse zero-sequence current (RZSC) compensation strategy for three-phase four-wire back-to-back active power conditioner (APC) is proposed. The objective of the APC is to achieve the active and reactive power compensation between two micro-grids. However, for the unbalanced voltage sag micro-grid system, the double-line frequency oscillation exists in the output active/reactive...
Due to fossil fuel depletion, power shortage has become a major problem in the world. This increases the importance of Distributed Energy Resources (DERs) among the consumers which in turn led to the expansion of microgrid. Microgrid operates in grid-connected mode as well as in islanded mode. Microgrid is connected to main grid in grid connected mode. In islanded mode, there is no such connection...
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