Microgrids Design and Implementation by Antonio Carlos Zambroni de Souza & Miguel Castilla

Author:Antonio Carlos Zambroni de Souza & Miguel Castilla
Language: eng
Format: epub
ISBN: 9783319986876
Publisher: Springer International Publishing

When the MV network becomes available, the MGCC requires the VSI of the MG main storage device to change its frequency and voltage slightly to check the synchronization conditions. Figure 9.18 shows a detail of the impact of the synchronization procedure in terms of current, active, and reactive power flowing in the LV side of the distribution transformer.

Fig. 9.18Synchronization current, active, and reactive power in the low voltage side of the distribution transformer

9.4 Concluding Remarks

The design and operation of an MG capable of islanding operation requires solving a number of demanding issues, in particular related to online management functionalities and system control. The presence of power electronic interfaces in microturbines or storage devices is one of the main characteristics of an MG that requires the development of specific control approaches. Therefore, a system with clusters of MS designed to operate in islanded mode requires some form of energy buffering to ensure initial energy balance. Concerning these general MG operation and control issues, the key control requirements that must be considered are:Primary frequency control mechanisms, which are associated to grid-forming units, that is, storage devices coupled to the Low Voltage (LV) grid through Voltage Source Inverters (VSI). This primary frequency control mechanism mimics the primary frequency control on conventional power systems and is responsible to ensure system synchronism during any islanding operating conditions.

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