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Due to the effect of line impedance and unequal load distribution, reactive power supplied by distributed power resources (DR) based on voltage source converter could not be shared according to their droop gains and the power quality will also be affected in ac microgrid. In this paper, a novel hierarchical control of ac micro-grid according to different time scales is proposed to improve power Sharing...
In remote regions were a main distribution grid is not available, the implementation of Microgrids with Distributed Energy Resources (DERs) are very useful. In this context, a Stand-Alone Wind/Diesel Microgrid with modular architecture is proposed. The main scope is to feed Residential loads and a Water Pumping System through a local AC BUS. The random characteristics of the wind makes necessary to...
Due to the unbalance condition, the voltage of microgrid would be deteriorated. In this paper, a unify unbalance compensation strategy is proposed to suppress the unbalanced voltage and the voltage variation for islanded microgrid with unbalanced condition. Comparing to the traditional compensation strategy, where only negative sequence components of voltage are suppressed, in the proposed scheme,...
The microgrid must be able to transfer from grid-connected mode into islanding operation mode seamlessly to guarantee the power reliability for the critical local load. In the grid-tied mode, the power exchanged with the main grid should be smoothed to reduce the disturbance to the main grid, while the quality of the bus voltage in the islanding operation mode is significant. This paper presents a...
This paper presents the theoretical analysis of the inherent reason of current harmonic and power oscillation phenomena in case of operating the microgrid inverter under unbalanced grid voltage conditions. In order to flexibly control the current harmonic and power oscillation, a new stationary frame control strategy is proposed. It has a simple control structure due to no need of a phase-locked loop...
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