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This paper proposes a novel automatic mode transition control strategy for multiple inverters to operate in grid-connected and standalone modes. When grid is available, these inverters feed power the grid by operating in current control mode. Upon grid failure, all inverters automatically shift to droop control mode for achieving proportional power sharing and shift back to current control mode when...
This paper investigates the effect of reconfiguration and network type (mesh/radial) on small signal stability margin of a droop-based islanded microgrid. A low voltage microgrid and standard IEEE 33 bus system (with three and five sources) are considered for study. From eigenvalue analysis and root locus plot, it is found that the reconfiguration and network type has significant effect on small signal...
Droop control techniques reported in the literature mainly use compensator based multi-loop feedback structure. To tune these compensators either trial method or inverter average model based complex compensator design method is used. It is cumbersome to tune these compensators especially when large number of inverters having different power ratings are present in the system. In this paper, two novel...
This paper proposes a novel automatic mode transition control strategy for multiple inverters to operate in grid-connected and islanded modes without communication. When grid is available, all the inverters operate in grid-tied current control mode and transfer available power to the grid. On grid failure, they automatically shift to conventional droop control mode and shift back to grid-tied current...
This paper proposes a topology consisting of Zig-Zag transformer for neutral current compensation and reduced rating three-leg single capacitor DSTATCOM for load balancing and unity power factor operation in the presence of unbalanced and distorted load voltages. The detailed analysis of different voltages induced and currents flowing inside Zig-Zag transformer shows that Zig-Zag transformer provides...
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