In general, the connection of several single-phase inverters to a DC bus to supply AC loads generates a double-frequency power oscillation in the DC link. Usually, each single-phase inverter has a random voltage phase angle reference and a different load power factor that strongly influences the DC bus power quality.
In major cases, not all the inverters will have the same S power at once. This fact increases exponentially the complexity of the solver. The power sum Eq. (9) has two parts: a DC offset and an alternating component. To dampen the DC bus power oscillation, only the alternating component needs to be minimized. Thus, Eq.
It is considered 3 inverters with equal S power magnitudes. The polar graph illustrates 8 solutions, starting with all inverters at 0 ° degrees. The endpoint (marked by a cross) depicts the total displacement sum for all inverters to minimize DC power oscillation.
It is worth noting that, in cases of lower S power, the PF is reduced, due to the converter reactive power consumption. In addition, Fig. 11 (d) shows each inverter θ v k update. Initially, all inverters start with a reference angle set to 0 °.
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