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Investigated in this paper is the use of state variable feedback control combined with a PI controller for a single-phase grid-connected inverter with an LC filter operating under weak grid conditions. This condition is characterized by a grid impedance much larger than the inductance in the LC filter. Under weak grid conditions, variations in the grid impedance can degrade the performance of the...
Single-phase inverters are connected to the grid at the distribution system level. Because the grid impedance can be large at this level, it is important to consider the effect of the grid impedance on the control performance of the inverter. A PI controller is often adopted for current control in a single-phase inverter. With an increase in the grid impedance, the open loop cut-off frequency decreases,...
Explored in this paper is the grid impedance effect on the stability of a single-phase grid connected inverter with an LC filter based on the analysis of inverter output impedance. For a single-phase grid connected inverter, a PI controller is often used to regulate the current injected into the grid. However, the control performance can be influenced when the inverter is connected to a weak grid...
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