Modeling simulation and inverter control strategy research of
A standard microgrid power generation model and an inverter control model suitable for grid-connected and off-grid microgrids are built, and the voltage and frequency fluctuations
An inverter-based MG consists of micro-sources, distribution lines and loads that are connected to main-grid via static switch. The inverter models include variable frequencies as well as voltage amplitudes. In an inverter-based microgrid, grid-connected inverters are responsible for maintaining a stable operating point [112, 113].
Description: The microgrid is requested to reconnect to the main grid between 5 and 9 s. If the reconnection criteria are not met, the microgrid reconnects to the main grid at 9 s. This paper presents an integrated synchronization control that smooths the angle change of a grid-forming inverter during microgrid transition operation.
These power converters can function only in island mode, where the grid controls the voltage and frequency. They require an external synchronization signal, which the microgrid central controller supplies to function in parallel with other grid-forming inverters .
The grid-forming-based inverter control consists of a virtual synchronous machine (VSM) for regulating the voltage and frequency of the power system along with active power control and reactive power control for significantly improving the dynamic performance of the grid-connected PV system.
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