A droop frequency controller for maintaining different frequency qualities in stand-alone multi-micro-grid system and the stand-alone multi-micro-grid system using the droop frequency controller

摘要

The present invention relates to a drop frequency controller for maintaining different frequency qualities in a standalone multiple microgrid system and a standalone multiple microgrid system using the same. The present invention as described above comprises a drop frequency control unit for receiving the system frequency in the corresponding micro grid to calculate the normalized frequency deviation and output the DC link voltage deviation; A power controller configured to generate a reference current such that the DC link voltage follows a voltage obtained by adding a DC link voltage command to the DC link voltage deviation output from the drop frequency controller; And a drop frequency controller for maintaining different frequency qualities in the independent multi-micro grid system including a current controller outputting a modulated signal to a corresponding converter so that a terminal current follows the reference current output from the power controller. Provides a standalone multi-micro grid system.