About Unbalanced output of photovoltaic inverter
During unbalanced operations, with Q (V) control applied, the PV inverter reacts to the under- and over-voltage situations by generating and absorbing reactive power. The amount of the reactive power is controlled by the positive sequence voltage and proportional to that under the balanced operation.
During unbalanced operations, with Q (V) control applied, the PV inverter reacts to the under- and over-voltage situations by generating and absorbing reactive power. The amount of the reactive power is controlled by the positive sequence voltage and proportional to that under the balanced operation.
The proposed method not only injects necessary active and reactive power but also minimizes overcurrent with increased exploitation of the inverter’s capacity under unbalanced grid voltage sag.
A control strategy is proposed for a three-phase PV inverter capable of injecting partially unbalanced currents into the electrical grid. This strategy aims to mitigate preexisting current imbalances in this grid while forwarding the active power from photovoltaic panels.
Given these challenges, this paper aims to develop a novel control strategy for grid-connected PV inverters under unbalanced grid conditions. This approach emphasizes reducing the oscillations that occur at twice the grid frequency within the DC-link voltage while maintaining a sinusoidal grid current with minimal harmonics.
Paper [19] presents a new multi-objective control strategy for PV inverter to ensure its safe and continuous operation under unbalanced voltage drop. The proposed control strategy can effectively improve the LVRT capability.
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