Are flexible control schemes suitable for a three-phase grid-connected inverter?

Policies and ethics This paper investigates flexible control schemes for a three-phase grid-connected inverter, especially under unbalanced grid voltage conditions. PWM controlled three-phase voltage source inverters (VSIs) are widely used in renewable energy-based power generation...

What are grid-connected inverters?

Grid-connected inverters as one group of power-electronic interfaces, transferring electric energy from the primary sources to the power grids, are the critical devices [ 1 - 3 ]. The steady performances and dynamic responses of these inverters have a significant influence on their power qualities [ 4, 5 ].

Are grid-connected inverters reliable?

The results verify the effectiveness of the proposed method. The grid-connected inverters may experience excessive current stress in case of unbalanced grid voltage fault ride through (FRT), which significantly affects the reliability of the power supply system.

What are the performance targets for grid-connected inverters under unbalanced grid faults?

Abstract: Power oscillation and current quality are the important performance targets for the grid-connected inverter under unbalanced grid faults. First, the inherent reason for the current harmonic and power oscillation of the inverter is discussed with a quantitative analysis.

Do grid-connected inverters experience excessive current stress?

Abstract: The grid-connected inverters may experience excessive current stress in case of unbalanced grid voltage fault ride through (FRT), which significantly affects the reliability of the power supply system.

Can fsmpdpc control a grid-connected inverter in unbalance grid voltage?

However, there are obvious distortions in the grid current. Therefore, the FSMPDPC is not a suitable choice to control the grid-connected inverter in unbalance grid voltage. When the reactive power reference is 0 kVAR on the left side of Fig. 8, the MV-MPPC can remove the active power oscillation and suppress the grid current distortion.