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This paper proposes a fault-ride-through (FRT) method for a single-phase grid-connected inverter with a minimized inductor by reducing the inverter output current overshoot. When a low-inductance interconnected inductor is used, the inverter output current overshoot becomes very high at a voltage sag and a voltage recovery. Therefore, a grid-voltage fault stops the operation of the grid-connected...
This paper proposes a Discontinuous current mode (DCM) feedback current control for the grid-connected inverter in order to achieve the low THD of the grid current at wide load range. In the DCM operation, the nonlinearity between the duty ratio and the current occurs in the current command response, whereas another nonlinearity between the disturbance voltage and the current occurs in the disturbance...
When a inductance of a single-phase grid-connected inverter is minimized, the effect of the disturbance to the current control such as the dead-time error voltage increases. This paper proposes a disturbance compensation method by using a high-performance disturbance observer. In particular, in the control system, the current controller is implemented by the digital signal processor, whereas the high-performance...
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