Dynamic voltage compensation using Series Voltage Regulator for DC-microgid

The concept of a novel Series Voltage Regulator (SVR) for controlling DC bus voltage of a radial DC microgrid is presented in this paper. The proposed SVR uses a dual active bridge DC-DC converter. It injects dynamic voltage in series with the DC grid to compensate resistive drop over the network. As a result, the voltage level at the different points of the grid becomes independent of load variation and stays within the specified limit. Note that the required power rating of the SVR is very low (say 2.5%) compared to the load demand considering 5% voltage regulation. In this work, the voltage regulator is connected at the mid-point of the grid, but it may be connected in some other points to get an optimal rating of the same. The proposed configuration is simulated in PSIM to check the dynamic performance under various operating conditions. The results show the effectiveness of such voltage regulator for radial DC microgrid, especially under critical load condition.

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