It is mandatory to comprise an interface by using intelligent electronic systems between DG sources and microgrid. These interfaces are provided either by current source inverters (CSIs) that include phase locked loop (PLL) for grid synchronization and internal current loop or by voltage source inverters (VSIs). .
When two or more VSI are connected in parallel, the active and reactive power circulation occurs as seen in Fig. 15.5. This control level adjusts the reference voltage. .
The secondary control level is improved to compensate voltage and frequency fluctuations in microgrids. The secondary control manages regulation process to eliminate. .
The tertiary control is the highest level in hierarchical control structure, and has the lowest operation speed among others. This control level is related with economic. [pdf]
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