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To prove the concept, the paper includes simulation results and experiments accomplished on a complex laboratory MG system based on three parallel inverters, one being controlled as MG-forming VSG, while the others operating as MG-supporting inverters.
According to the principle of master slave control, the micro-source inverters can be divided into grid-feeding, grid-forming, and PQ-droop grid-supporting inverters.
The PQ-droop and ωU-droop grid-supporting inverters can be regarded as the upgraded version of grid-feeding and grid-forming inverters with a more flexible load sharing capability.
Fig. 6 Simplified model of ωU-droop grid-supporting inverter .
b Control block diagram of ωU-droop grid-supporting inverter.
a Control block diagram of PQ-droop grid-supporting inverter.
Fig. 7 Control block diagram of ωU-droop Grid-supporting inverter applying decoupling transformation method.
Then, the main problems and some typical improved schemes of the ωU-droop grid-supporting inverter are presented.
The control method for the MG-supporting inverters that allow achieving the proposed control approach is also described.
By this arrangement, the MG-forming VSG is designed to react only in transitory regimes, the steady-state load being distributed to other MG-supporting inverters spread within the MG.
This paper illustrates the control principles of micro-source inverters, including grid-feeding, grid-forming, and grid-supporting inverters.
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