| 摘要 |
Disclosed is an apparatus for controlling a grid connected inverter dealing with a direct current link voltage, capable of controlling an operation of a solar ray inverter by definitely analyzing a voltage drop by an LCL type filter structure applied to the grid connected inverter like the grid connected solar ray inverter and calculating a minimum voltage required for a direct current link of the grid connected solar ray inverter. The apparatus for controlling the grid connected inverter dealing with the direct current link voltage comprises an inverter part for performing a pulse width modulation of a direct current voltage supplied by a direct current power source and outputting the modulated direct current voltage; a filter part including an inductor and a capacitor for filtering an output voltage of the inverter part and supplying the output voltage to a grid; a minimum direct current link voltage calculation part for calculating a minimum direct current link voltage level capable of supplying power to the grid by using at least one portion of a level of a current inputted into the filter part, a level of a current inputted into the grid from the filter part, and a grid voltage level; and a comparison part for comparing the minimum direct current link voltage level with the direct current voltage level and outputting an inverter operation control signal for controlling an operation of the inverter part according to the result thereof. |
