About Frequency of DC microgrid
Furthermore, unlike conventional AC systems, DC microgrids do not have issues such as synchronization, harmonics, reactive power control, and frequency control. However, the incorporation of different distributed generators, such as PV, wind, fuel cell, loads, and energy storage devices in the common DC bus complicates the control of DC bus .
Furthermore, unlike conventional AC systems, DC microgrids do not have issues such as synchronization, harmonics, reactive power control, and frequency control. However, the incorporation of different distributed generators, such as PV, wind, fuel cell, loads, and energy storage devices in the common DC bus complicates the control of DC bus .
DC microgrid has many technical advantages over AC microgrid, these include easy integration of renewable energy resources, direct connection between the consumer loads and DC bus voltage, more simply mitigated harmonics, and no frequency as well as reactive power control problem.
DC microgrid concept is the same as the conventional microgrid, but power is available in the DC form. It is the integration of energy storage devices and the main grid. DC microgrid can operate in both the ways, grid-connected mode and islanded mode of operation.
If load increases in DC microgrid, it drops the DC voltage from to and produces a new angular frequency . The droop control inside AC microgrid then determines the amount of power to be transferred to DC grid at this new frequency.
An aggregate and consolidated load-frequency control is proposed in Reference 276 for an autonomous microgrid, where, an electronic load controller is engaged to control the microgrid frequency by applying a centralized LFC controller, that is based upon a grouping of battery storage system and smart load.
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